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Trailing-Edge - PDP-10 Archives - bb-l014w-bm_tops20_v7_0_atpch_23 - autopatch/table.mem
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                     TOPS-20 Monitor Table Descriptions

                            Autopatch Number 22












                                 April 1989

                  This  document  describes  the  internal
                  tables of the TOPS-20 operating system.

                  This manual is a revision  and  replaces
                  TOPS-20   Monitor   Table  Descriptions,
                  order number AA-V917C-RM.

                  OPERATING SYSTEM:    TOPS-20 Version 7.0

                  SOFTWARE:            TOPS-20 Version 7.0


                                             First Printing, October 1980
                                                        Revised, May 1984
                                                      Revised, April 1986
                                                      Revised, April 1989



   The information in this document is subject to change  without  notice
   and  should  not  be  construed  as  a commitment by Digital Equipment
   Corporation.  Digital Equipment Corporation assumes no  responsibility
   for any errors that may appear in this document.

   The software described in this document is furnished under  a  license
   and  may  only  be used or copied in accordance with the terms of such
   license.

   No responsibility is assumed for the use or reliability of software on
   equipment that is not supplied by Digital Equipment Corporation or its
   affiliated companies.


   Copyright  C 1980, 1984, 1986, 1989, Digital Equipment Corporation.

   All Rights Reserved.
   Printed in U.S.A.



   The following are trademarks of Digital Equipment Corporation:

   CI             DECtape     LA50             SITGO-10
   DDCMP          DECUS       LN01             TOPS-10
   DEC            DECwriter   LN03             TOPS-20
   DECmail        DELNI       MASSBUS          TOPS-20AN
   DECnet         DELUA       PDP              UNIBUS
   DECnet-VAX     HSC         PDP-11/24        UETP
   DECserver      HSC-50      PrintServer      VAX
   DECserver 100  KA10        PrintServer 40   VAX/VMS
   DECserver 200  KI          Q-bus            VT50
   DECsystem-10   KL10        ReGIS
   DECSYSTEM-20   KS10        RSX              d i g i t a l


                                      CONTENTS



   PREFACE
                   AA   . . . . . . . . . . . . . . . . . . . . . . . . 1
                   AC   . . . . . . . . . . . . . . . . . . . . . . . . 2
                   AJ   . . . . . . . . . . . . . . . . . . . . . . . . 3
                   AK   . . . . . . . . . . . . . . . . . . . . . . . . 4
                   ALOC1  . . . . . . . . . . . . . . . . . . . . . . . 5
                   ALOC2  . . . . . . . . . . . . . . . . . . . . . . . 6
                   BAT  . . . . . . . . . . . . . . . . . . . . . . . . 7
                   BD   . . . . . . . . . . . . . . . . . . . . . . . . 9
                   BP   . . . . . . . . . . . . . . . . . . . . . . .  10
                   BR   . . . . . . . . . . . . . . . . . . . . . . .  11
                   BTB  . . . . . . . . . . . . . . . . . . . . . . .  12
                   BU   . . . . . . . . . . . . . . . . . . . . . . .  14
                   BUG-HLT/CHK/INF-STORAGE-AREA . . . . . . . . . . .  16
                   C1   . . . . . . . . . . . . . . . . . . . . . . .  17
                   CA   . . . . . . . . . . . . . . . . . . . . . . .  18
                   CB-LATSRV  . . . . . . . . . . . . . . . . . . . .  19
                   CB-LLMOP   . . . . . . . . . . . . . . . . . . . .  21
                   CB-SCPAR   . . . . . . . . . . . . . . . . . . . .  23
                   CC-LATSRV  . . . . . . . . . . . . . . . . . . . .  24
                   CC-NIPAR   . . . . . . . . . . . . . . . . . . . .  25
                   CD   . . . . . . . . . . . . . . . . . . . . . . .  28
                   CDB  . . . . . . . . . . . . . . . . . . . . . . .  29
                   CDBCAD . . . . . . . . . . . . . . . . . . . . . .  32
                   CDR-STORAGE-AREA . . . . . . . . . . . . . . . . .  34
                   CDS  . . . . . . . . . . . . . . . . . . . . . . .  37
                   CF   . . . . . . . . . . . . . . . . . . . . . . .  38
                   CFHSHT . . . . . . . . . . . . . . . . . . . . . .  39
                   CFHSTS . . . . . . . . . . . . . . . . . . . . . .  40
                   CFNNAM . . . . . . . . . . . . . . . . . . . . . .  41
                   CFSHNM . . . . . . . . . . . . . . . . . . . . . .  42
                   CFSHST . . . . . . . . . . . . . . . . . . . . . .  43
                   CFSOFN . . . . . . . . . . . . . . . . . . . . . .  44
                   CFS RESOURCE BLOCK . . . . . . . . . . . . . . . .  45
                   CFSSTR . . . . . . . . . . . . . . . . . . . . . .  48
                   CFS VOTER MESSAGE BUFFER . . . . . . . . . . . . .  49
                   CH-CTERMD  . . . . . . . . . . . . . . . . . . . .  51
                   CH-D36COM  . . . . . . . . . . . . . . . . . . . .  53
                   CH-LLMOP   . . . . . . . . . . . . . . . . . . . .  54
                   CHNTAB . . . . . . . . . . . . . . . . . . . . . .  55
                   CICMST . . . . . . . . . . . . . . . . . . . . . .  56
                   CIDATA . . . . . . . . . . . . . . . . . . . . . .  57
                   CI RELATED VARIABLES . . . . . . . . . . . . . . .  58
                   CLASS-SCHEDULER-STORAGE  . . . . . . . . . . . . .  61
                   CLUHST . . . . . . . . . . . . . . . . . . . . . .  63
                   CLUSTS . . . . . . . . . . . . . . . . . . . . . .  64
                   CM   . . . . . . . . . . . . . . . . . . . . . . .  65


                                    iii


                   CONNECT ID FORMAT  . . . . . . . . . . . . . . . .  66
                   CSTnX  . . . . . . . . . . . . . . . . . . . . . .  67
                   CST0 . . . . . . . . . . . . . . . . . . . . . . .  68
                   CST1 . . . . . . . . . . . . . . . . . . . . . . .  70
                   CST2 . . . . . . . . . . . . . . . . . . . . . . .  71
                   CST3 . . . . . . . . . . . . . . . . . . . . . . .  73
                   CST5 . . . . . . . . . . . . . . . . . . . . . . .  75
                   CT . . . . . . . . . . . . . . . . . . . . . . . .  76
                   DEV`DTB  . . . . . . . . . . . . . . . . . . . . .  77
                   DEVCH1 . . . . . . . . . . . . . . . . . . . . . .  79
                   DEVCH2 . . . . . . . . . . . . . . . . . . . . . .  80
                   DEVCHR . . . . . . . . . . . . . . . . . . . . . .  81
                   DEVDSP . . . . . . . . . . . . . . . . . . . . . .  82
                   DEVNAM . . . . . . . . . . . . . . . . . . . . . .  83
                   DEVUNT . . . . . . . . . . . . . . . . . . . . . .  84
                   DIRECTORY  . . . . . . . . . . . . . . . . . . . .  85
                   DIRECTORY CACHE  . . . . . . . . . . . . . . . . .  94
                   DL   . . . . . . . . . . . . . . . . . . . . . . .  95
                   DNA PARAMETER AND COUNTER DATA BASE  . . . . . . .  96
                   DRMBBT . . . . . . . . . . . . . . . . . . . . . .  98
                   DRMCNT . . . . . . . . . . . . . . . . . . . . . .  99
                   DSKSIZ . . . . . . . . . . . . . . . . . . . . . . 100
                   DSKSZ`N  . . . . . . . . . . . . . . . . . . . . . 101
                   DSKUTP . . . . . . . . . . . . . . . . . . . . . . 102
                   DST  . . . . . . . . . . . . . . . . . . . . . . . 103
                   DTE-STORAGE-AREA . . . . . . . . . . . . . . . . . 104
                   DTEDTV . . . . . . . . . . . . . . . . . . . . . . 115
                   EC   . . . . . . . . . . . . . . . . . . . . . . . 116
                   EL   . . . . . . . . . . . . . . . . . . . . . . . 117
                   ENQ/DEQ-LOCK-BLOCK . . . . . . . . . . . . . . . . 119
                   ENQ/DEQ - STORAGE AREA . . . . . . . . . . . . . . 121
                   EPT  . . . . . . . . . . . . . . . . . . . . . . . 123
                   ES   . . . . . . . . . . . . . . . . . . . . . . . 127
                   ET   . . . . . . . . . . . . . . . . . . . . . . . 129
                   EXEC-PG-MAP-TBL  . . . . . . . . . . . . . . . . . 130
                   FA   . . . . . . . . . . . . . . . . . . . . . . . 131
                   FB   . . . . . . . . . . . . . . . . . . . . . . . 132
                   FDB  . . . . . . . . . . . . . . . . . . . . . . . 133
                   FE-STORAGE-AREA  . . . . . . . . . . . . . . . . . 138
                   FKBSPW . . . . . . . . . . . . . . . . . . . . . . 140
                   FKCNO  . . . . . . . . . . . . . . . . . . . . . . 141
                   FKINT  . . . . . . . . . . . . . . . . . . . . . . 142
                   FKINTB . . . . . . . . . . . . . . . . . . . . . . 144
                   FKJOB  . . . . . . . . . . . . . . . . . . . . . . 145
                   FKJTQ  . . . . . . . . . . . . . . . . . . . . . . 146
                   FKNBW  . . . . . . . . . . . . . . . . . . . . . . 147
                   FKNR . . . . . . . . . . . . . . . . . . . . . . . 148
                   FKPGS  . . . . . . . . . . . . . . . . . . . . . . 149
                   FKPGST . . . . . . . . . . . . . . . . . . . . . . 150
                   FKPT . . . . . . . . . . . . . . . . . . . . . . . 151
                   FKQ1 . . . . . . . . . . . . . . . . . . . . . . . 152


                                     iv


                   FKQ2 . . . . . . . . . . . . . . . . . . . . . . . 153
                   FKSTA2 . . . . . . . . . . . . . . . . . . . . . . 154
                   FKSTAT . . . . . . . . . . . . . . . . . . . . . . 155
                   FKSWP  . . . . . . . . . . . . . . . . . . . . . . 156
                   FKTIME . . . . . . . . . . . . . . . . . . . . . . 157
                   FKWSP  . . . . . . . . . . . . . . . . . . . . . . 158
                   FL   . . . . . . . . . . . . . . . . . . . . . . . 159
                   FREESPACE BLOCK HEADER/TRAILER . . . . . . . . . . 160
                   FREESPACE DESCRIPTOR . . . . . . . . . . . . . . . 161
                   FREESPACE-DESCRIPTOR INDEX TABLE . . . . . . . . . 162
                   FREESPACE HISTORY RECORD . . . . . . . . . . . . . 163
                   GB   . . . . . . . . . . . . . . . . . . . . . . . 164
                   GTOKPR . . . . . . . . . . . . . . . . . . . . . . 165
                   HC   . . . . . . . . . . . . . . . . . . . . . . . 167
                   HN   . . . . . . . . . . . . . . . . . . . . . . . 168
                   HOM  . . . . . . . . . . . . . . . . . . . . . . . 170
                   HOME . . . . . . . . . . . . . . . . . . . . . . . 173
                   HOMTAB . . . . . . . . . . . . . . . . . . . . . . 174
                   IA   . . . . . . . . . . . . . . . . . . . . . . . 175
                   IB   . . . . . . . . . . . . . . . . . . . . . . . 176
                   IDXFIL . . . . . . . . . . . . . . . . . . . . . . 177
                   IM   . . . . . . . . . . . . . . . . . . . . . . . 179
                   INDEX  . . . . . . . . . . . . . . . . . . . . . . 180
                   INIDEV . . . . . . . . . . . . . . . . . . . . . . 181
                   INIDV1 . . . . . . . . . . . . . . . . . . . . . . 182
                   INIDVT . . . . . . . . . . . . . . . . . . . . . . 183
                   IORB . . . . . . . . . . . . . . . . . . . . . . . 186
                   IPCF-MESSAGE-HEADER  . . . . . . . . . . . . . . . 189
                   IPCF-PID-HEADER  . . . . . . . . . . . . . . . . . 190
                   IPCF-STORAGE-AREA  . . . . . . . . . . . . . . . . 191
                   JOB AREA . . . . . . . . . . . . . . . . . . . . . 192
                   JOBDIR . . . . . . . . . . . . . . . . . . . . . . 193
                   JOBNAM . . . . . . . . . . . . . . . . . . . . . . 194
                   JOBPNM . . . . . . . . . . . . . . . . . . . . . . 195
                   JOBPT  . . . . . . . . . . . . . . . . . . . . . . 196
                   JOBRT  . . . . . . . . . . . . . . . . . . . . . . 197
                   JOBRTL . . . . . . . . . . . . . . . . . . . . . . 198
                   JSB  . . . . . . . . . . . . . . . . . . . . . . . 199
                   KB   . . . . . . . . . . . . . . . . . . . . . . . 210
                   KDB  . . . . . . . . . . . . . . . . . . . . . . . 211
                   LB   . . . . . . . . . . . . . . . . . . . . . . . 216
                   LD   . . . . . . . . . . . . . . . . . . . . . . . 217
                   LH   . . . . . . . . . . . . . . . . . . . . . . . 218
                   LI   . . . . . . . . . . . . . . . . . . . . . . . 219
                   LK   . . . . . . . . . . . . . . . . . . . . . . . 220
                   LN   . . . . . . . . . . . . . . . . . . . . . . . 221
                   LOGICAL-NAME-DEFINITION  . . . . . . . . . . . . . 222
                   LOGICAL-NAMES-LIST . . . . . . . . . . . . . . . . 223
                   LPT-STORAGE-AREA . . . . . . . . . . . . . . . . . 224
                   LS   . . . . . . . . . . . . . . . . . . . . . . . 230
                   LT   . . . . . . . . . . . . . . . . . . . . . . . 231


                                     v


                   MB   . . . . . . . . . . . . . . . . . . . . . . . 232
                   MD-D36PAR  . . . . . . . . . . . . . . . . . . . . 233
                   MD-NIPAR   . . . . . . . . . . . . . . . . . . . . 234
                   MN   . . . . . . . . . . . . . . . . . . . . . . . 235
                   MONITOR-STATISTICS . . . . . . . . . . . . . . . . 236
                   MSCCID . . . . . . . . . . . . . . . . . . . . . . 239
                   MSCINT . . . . . . . . . . . . . . . . . . . . . . 240
                   MSCOLD . . . . . . . . . . . . . . . . . . . . . . 241
                   MSCP SERVER COMMAND HEADER . . . . . . . . . . . . 242
                   MSCP SERVER STORAGE  . . . . . . . . . . . . . . . 244
                   MSCTMO . . . . . . . . . . . . . . . . . . . . . . 246
                   MT   . . . . . . . . . . . . . . . . . . . . . . . 247
                   MTA-STORAGE-AREA . . . . . . . . . . . . . . . . . 248
                   MTCUTB . . . . . . . . . . . . . . . . . . . . . . 256
                   NAMUTP . . . . . . . . . . . . . . . . . . . . . . 257
                   NE   . . . . . . . . . . . . . . . . . . . . . . . 258
                   NF . . . . . . . . . . . . . . . . . . . . . . . . 259
                   NM   . . . . . . . . . . . . . . . . . . . . . . . 260
                   NN   . . . . . . . . . . . . . . . . . . . . . . . 261
                   NO-SCLINK  . . . . . . . . . . . . . . . . . . . . 263
                   NO-SCPAR   . . . . . . . . . . . . . . . . . . . . 264
                   NR   . . . . . . . . . . . . . . . . . . . . . . . 265
                   NT   . . . . . . . . . . . . . . . . . . . . . . . 266
                   NTCTAB . . . . . . . . . . . . . . . . . . . . . . 268
                   NX   . . . . . . . . . . . . . . . . . . . . . . . 269
                   OA   . . . . . . . . . . . . . . . . . . . . . . . 271
                   OFNLEN . . . . . . . . . . . . . . . . . . . . . . 272
                   PA   . . . . . . . . . . . . . . . . . . . . . . . 273
                   PB-PHYKNI  . . . . . . . . . . . . . . . . . . . . 274
                   PB-SCPAR   . . . . . . . . . . . . . . . . . . . . 276
                   PC   . . . . . . . . . . . . . . . . . . . . . . . 277
                   PCB (PORT CONTROL BLOCK) . . . . . . . . . . . . . 278
                   PHYCHT . . . . . . . . . . . . . . . . . . . . . . 280
                   PHYUNT . . . . . . . . . . . . . . . . . . . . . . 281
                   PI   . . . . . . . . . . . . . . . . . . . . . . . 282
                   PIDCNT . . . . . . . . . . . . . . . . . . . . . . 283
                   PIDTBL . . . . . . . . . . . . . . . . . . . . . . 284
                   PL   . . . . . . . . . . . . . . . . . . . . . . . 285
                   PR-NISRV   . . . . . . . . . . . . . . . . . . . . 286
                   PR-NIUSR   . . . . . . . . . . . . . . . . . . . . 287
                   PRMP . . . . . . . . . . . . . . . . . . . . . . . 288
                   PROCESS STORAGE AREA . . . . . . . . . . . . . . . 289
                   PS-PHYKNI  . . . . . . . . . . . . . . . . . . . . 291
                   PS-SCPAR   . . . . . . . . . . . . . . . . . . . . 294
                   PSB  . . . . . . . . . . . . . . . . . . . . . . . 295
                   PT-IPCIDV  . . . . . . . . . . . . . . . . . . . . 302
                   PT-PHYKNI  . . . . . . . . . . . . . . . . . . . . 303
                   PT-SCPAR   . . . . . . . . . . . . . . . . . . . . 304
                   PTYSTS . . . . . . . . . . . . . . . . . . . . . . 305
                   QA   . . . . . . . . . . . . . . . . . . . . . . . 306
                   QB   . . . . . . . . . . . . . . . . . . . . . . . 307


                                     vi


                   Q-BLOCK  . . . . . . . . . . . . . . . . . . . . . 308
                   QE   . . . . . . . . . . . . . . . . . . . . . . . 310
                   QH-D36PAR  . . . . . . . . . . . . . . . . . . . . 311
                   QH-PHYKNI  . . . . . . . . . . . . . . . . . . . . 312
                   QL   . . . . . . . . . . . . . . . . . . . . . . . 313
                   QP   . . . . . . . . . . . . . . . . . . . . . . . 314
                   RB   . . . . . . . . . . . . . . . . . . . . . . . 315
                   RC-D36PAR  . . . . . . . . . . . . . . . . . . . . 316
                   RC-PHYKNI  . . . . . . . . . . . . . . . . . . . . 318
                   RD   . . . . . . . . . . . . . . . . . . . . . . . 321
                   RES-FREE-SPACE . . . . . . . . . . . . . . . . . . 323
                   RI   . . . . . . . . . . . . . . . . . . . . . . . 326
                   RIDSTS (REQUEST-ID STATUS) . . . . . . . . . . . . 327
                   RM   . . . . . . . . . . . . . . . . . . . . . . . 328
                   RS   . . . . . . . . . . . . . . . . . . . . . . . 329
                   RT   . . . . . . . . . . . . . . . . . . . . . . . 330
                   SA . . . . . . . . . . . . . . . . . . . . . . . . 331
                   SB-LATSRV  . . . . . . . . . . . . . . . . . . . . 333
                   SB-PHYKNI  . . . . . . . . . . . . . . . . . . . . 335
                   SB-SCPAR   . . . . . . . . . . . . . . . . . . . . 336
                   SBLIST (SYSTEM BLOCK LIST) . . . . . . . . . . . . 337
                   SCA CONNECTION BLOCK . . . . . . . . . . . . . . . 338
                   SCA BUFFER RETURNED TO CLUDGR  . . . . . . . . . . 343
                   SCA RING BUFFER ENTRY  . . . . . . . . . . . . . . 345
                   SCDB . . . . . . . . . . . . . . . . . . . . . . . 350
                   SCDBTB . . . . . . . . . . . . . . . . . . . . . . 351
                   SCHED-VARIABLES  . . . . . . . . . . . . . . . . . 352
                   SCOUNT . . . . . . . . . . . . . . . . . . . . . . 357
                   SDB  . . . . . . . . . . . . . . . . . . . . . . . 358
                   SG-LLINKS  . . . . . . . . . . . . . . . . . . . . 361
                   SJ   . . . . . . . . . . . . . . . . . . . . . . . 362
                   SL   . . . . . . . . . . . . . . . . . . . . . . . 363
                   SN   . . . . . . . . . . . . . . . . . . . . . . . 365
                   SNAMES . . . . . . . . . . . . . . . . . . . . . . 366
                   SNBLKS . . . . . . . . . . . . . . . . . . . . . . 367
                   SPFLTS . . . . . . . . . . . . . . . . . . . . . . 368
                   SPT  . . . . . . . . . . . . . . . . . . . . . . . 369
                   SPTD . . . . . . . . . . . . . . . . . . . . . . . 371
                   SPTH . . . . . . . . . . . . . . . . . . . . . . . 372
                   SPTO . . . . . . . . . . . . . . . . . . . . . . . 374
                   SPTO2  . . . . . . . . . . . . . . . . . . . . . . 375
                   SPTO3  . . . . . . . . . . . . . . . . . . . . . . 376
                   SPTO4  . . . . . . . . . . . . . . . . . . . . . . 377
                   SS   . . . . . . . . . . . . . . . . . . . . . . . 378
                   SSIZE  . . . . . . . . . . . . . . . . . . . . . . 379
                   ST   . . . . . . . . . . . . . . . . . . . . . . . 380
                   STIMES . . . . . . . . . . . . . . . . . . . . . . 381
                   STRTAB . . . . . . . . . . . . . . . . . . . . . . 382
                   SV-LLINKS  . . . . . . . . . . . . . . . . . . . . 383
                   SV-LLMOP   . . . . . . . . . . . . . . . . . . . . 384
                   SWAP-FREE-SPACE (NON-EXTENDED) . . . . . . . . . . 386


                                    vii


                   SYNMTB . . . . . . . . . . . . . . . . . . . . . . 387
                   SYS-STARTUP-VECTORS  . . . . . . . . . . . . . . . 388
                   SYSERR-STORAGE-AREA  . . . . . . . . . . . . . . . 389
                   SYSTEM BLOCK . . . . . . . . . . . . . . . . . . . 409
                   TR   . . . . . . . . . . . . . . . . . . . . . . . 412
                   TT-LINE-DYN-DATA-BLK . . . . . . . . . . . . . . . 413
                   TTACTL . . . . . . . . . . . . . . . . . . . . . . 418
                   TTBUFS . . . . . . . . . . . . . . . . . . . . . . 419
                   TTCSAD . . . . . . . . . . . . . . . . . . . . . . 420
                   TTCSTM   . . . . . . . . . . . . . . . . . . . . . 421
                   TTSPWD . . . . . . . . . . . . . . . . . . . . . . 422
                   TTSTAT . . . . . . . . . . . . . . . . . . . . . . 423
                   TTY-STORAGE-AREA . . . . . . . . . . . . . . . . . 425
                   UD   . . . . . . . . . . . . . . . . . . . . . . . 427
                   UDB  . . . . . . . . . . . . . . . . . . . . . . . 428
                   UDIORB . . . . . . . . . . . . . . . . . . . . . . 435
                   UDS  . . . . . . . . . . . . . . . . . . . . . . . 436
                   UE   . . . . . . . . . . . . . . . . . . . . . . . 437
                   UN   . . . . . . . . . . . . . . . . . . . . . . . 438
                   UPT  . . . . . . . . . . . . . . . . . . . . . . . 440
                   USER-PG-MAP-TBL  . . . . . . . . . . . . . . . . . 443
                   VANA . . . . . . . . . . . . . . . . . . . . . . . 449
                   VN   . . . . . . . . . . . . . . . . . . . . . . . 451
                   VRB  . . . . . . . . . . . . . . . . . . . . . . . 452
                   VRPA . . . . . . . . . . . . . . . . . . . . . . . 453
                   VRQA . . . . . . . . . . . . . . . . . . . . . . . 454
                   WS   . . . . . . . . . . . . . . . . . . . . . . . 456
                   XR   . . . . . . . . . . . . . . . . . . . . . . . 457


   APPENDIX A      LISTING BY MONITOR MODULES






















                                    viii














                                  PREFACE


   This book describes the internal TOPS-20 monitor tables.   The  sample
   table  on  the following page illustrates the information presented in
   the book.  In addition to the tables,  this  book  also  contains  one
   appendix  which  lists  in alphabetical order the names of the monitor
   modules and the tables defined in each.

   Change bars in the  margin  identify  new  tables  and/or  changes  to
|  existing tables.  These changes are the result of software changes for
|  TOPS-20 V6, V6.1, and V7.0.





























                                     ix
                               MONITOR TABLES


                  SAMPLE  !This is the title of the table.

   Text description of the table

   Defined in:  STG  !This describes where either the storage is
                     !defined or where the symbols are defined or both

   Index: Fork number   !This field (optional) describes any standard
                        !index that may exist for the table

                                   Format
           +-------------------------------------------------------+
   STRG1:  |  POINT1                  |   POINT2                   |
   POINT3  |   description of POINT1  |    description of POINT2   |
           |_______________________________________________________| / \
   SYM1=n  |           Description of contents of SYM1             |  |
           |_______________________________________________________|
           |                           .                           | LEN
           |                           .                           |
           |                           .                           |  |
           \                           .                           \ \ /
   STRG2:  |                        flags                          | *
           +-------------------------------------------------------+


            0 1 2                                                35
           +-------------------------------------------------------+
   STRG2:  | | |                                                   |
           +-------------------------------------------------------+

        Symbol    Bits     Pointer     Content

        BTO        0       BT%0        System about to crash
        BT1        1       BT%1        System crashing
        BT235     2-35     BT2%35      Location where system crashes

   notes STRG1 and 2  are  actual  storage  locations  contained  in  the
   monitor.   POINT1,  2,  and  3 are pointers to words or parts of words
   usually defined by a DEFSTR macro.  SYML is a symbol with  a  specific
   value  (n)  usually to indicate displacements.  LEN is the length of a
   particular section of the table.  Numbers are octal except where  they
   indicate  bit positions and where they are indicated by D or a decimal
   point.

   "*" indicates further information on the word is found  following  the
   table.







                                     x
                               MONITOR TABLES


                                    AA

   This is the ACCEPT call's argument block,  which  is  used  by  DECnet
   Session Control and NSP.

   Defined in:  D36PAR

                                            Format                                  

                                    ACCEPT Argument Block                           
          +------------------------------------------------------------------------+ 
   AASCB  |                          SCB ID for new port                           |        
          |------------------------------------------------------------------------| 
   AAPID  |                         NSP's port identifier                          |        
          |------------------------------------------------------------------------| 
   AAFLO  |                           Flow control type                            |        
          |------------------------------------------------------------------------| 
   AAGOL  |                           Data request goal                            |        
          |------------------------------------------------------------------------| 
   AASIZ  |                 Max bytes allowed in a message segment                 |        
          |------------------------------------------------------------------------| 
   AASCV  |                    Session control's entry address                     |        
          +------------------------------------------------------------------------+ 






























                                     1
                               MONITOR TABLES


                                    AC

   AC is the LAT Host Access Codes portion of the  Host  Node  (HN)  data
   structure.   It  is a bit mask that defines what groups have access to
   the host.  Note that the bit mask is made up  of  PDP-11  style  8-bit
   bytes.  Therefore, group zero is represented by bit 7 -- the low order
   bit in the first byte.

   Defined in:  LATSRV

                                            Format                                  

                                         ACCESS CODES                               
          +------------------------------------------------------------------------+ 
   ACLNG  |                   Access code string length in bytes                   |                 
          |------------------------------------------------------------------------|  /\  
   ACCOD  |                      Storage for 256 bit bit-mask                      | ^D32 
          \                                                                        \  \/  
          +------------------------------------------------------------------------+ 


































                                     2
                               MONITOR TABLES


                                    AJ

   This is the DECnet Router adjancency block -- AJ.

   Defined in:  D36PAR

                                            Format                                  
          +------------------------------------------------------------------------+ 
   AJNXT  |                    Pointer to next adjacency block                     |        
          |------------------------------------------------------------------------| 
          |   | AJNTY | | | | | | |     AJVER     |     AJECO     |     AJCUS      |
          |   |       |   AJFLA   |  Version of   | ECO number of |   Customer     |
          |   |       |           |  neighbor's   |  neighbor's   |  version of    | *
          |   |       |           |    router     |    router     |  neighbor's    |
          |   |       |           |               |               |    router      |
          |------------------------------------------------------------------------| 
   AJNAH  |                   Adjacency's hi-order address (NI)                    |        
          |------------------------------------------------------------------------| 
          |               AJNAL               |   | AJNAA [+] |     AJNAN [+]      |
          |Low order in string format <a1,a2> |   |           | Adjacency's node   |
          |                                   |   |           |      number        |
          |------------------------------------------------------------------------| 
   AJRTV  |               Pointer to this adjacency's routing vector               |        
          |------------------------------------------------------------------------| 
   AJCBP  |                    Circuit block for this adjacency                    |        
          |------------------------------------------------------------------------| 
   AJBSZ  |                    Block size requested by neighbor                    |        
          |------------------------------------------------------------------------| 
   AJNHT  |                         Neighbor's hello timer                         |        
          |------------------------------------------------------------------------| 
   AJTLR  |               Time last message received from adjacency                |        
          |------------------------------------------------------------------------| 
          |     AJPRI     |     AJARE     |             AJMPD             |        |
          |    Routers    | Routers area  |        MPD (reserved)         |        |
          |priority to be |   (reserved   |                               |        |
          |  designated   |    field)     |                               |        |
          |  router (NI)  |               |                               |        |
          +------------------------------------------------------------------------+ 

    Field AJSTA (0-1) Adjacency state

    For field AJFLA(6-11):
     AJPH4    6 Phase 4 node
     AJVRQ    7 Verification requested by remote
     AJBLO    8 Blocking is requested by this node
     AJRJF    9 Reject flag
     AJMTA    10 No multi-cast traffic accepted



   ----------

   [+]   AJADR is a concatenation of AJNAA and AJNAN.
                                     3
                               MONITOR TABLES


                                    AK

   AK is the format of  the  DECnet  logical  link  ACKNUM  field.   This
   structure  is  expected  to  be  used  to pull apart a value held in a
   register.

   Defined in:  LLINKS

                                            Format                                  

                                            ACKNUM                                  
          +------------------------------------------------------------------------+ 
          |                                       | |     |         AKNUM          |
          |                                       | |     |  The ACK number, we    |
          |                                       | |     |     know this is       |
          |                                       | |     |rt-justified  negative  | *
          |                                       | |     |if high bit of byte is  |
          |                                       | |     |   set --  see LOADE    |
          |                                       | |     |   macro (E is as in    |
          |                                       | |     |        HRRE).          |
          +------------------------------------------------------------------------+ 

    Field AKPNT (20-20) Flag set if field is present

    Field AKQAL (21-23) Qualifier
          AK$QAK=0    0 is ACK
          AK$QNK=1    1 is NAK
          AK$CAK=2    2 is cross-sub channel ACK
          AK$CNK=3    3 is cross-sub channel NAK
























                                     4
                               MONITOR TABLES


                                   ALOC1

   Allocation 1 Table.  This non-resident table, the size of the OFN area
   in SPT, is used to help enforce disk quotas for each active directory.

   Defined in:  STG

   Index:  ALOCX portion of an OFN entry in the SPT

                                   Format
           +-------------------------------------------------------+ / \
   ALOC1:  |  ADIRN                    |  ODIRC                    |  |
   ALCWD   |       Directory No.       |    Directory OFN Count    |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           | NOFN
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \  |
           +-------------------------------------------------------+ \ /

   The right half of each slot in this table contains a count of all OFNs
   for files from that directory.





























                                     5
                               MONITOR TABLES


                                   ALOC2

   Allocation 2 Table.  This non-resident table, the size of the OFN area
   in SPT, is used in disk quota enforcement for each active directory.

   Defined in:  STG

   Index:  ALOCX portion of an OFN entry in the SPT

                                   Format
           +-------------------------------------------------------+ / \
           |  PGLFT*                                               |  |
   ALOC2:  |        Count of Pages Left for This Directory         |  |
           |                 (may be negative)                     |  |
           |-------------------------------------------------------|  |
           |                           .                           | NOFN
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \  |
           +-------------------------------------------------------+ \ /
   An alternate use for this word is

        PGPTR
   Pointer to CFS data base entry when CFS is used.




























                                     6
                               MONITOR TABLES


                                    BAT

   Bad Allocation Table.  The BAT Block is  one  sector  in  length  (128
   words).   It  consists  of 4 words of header, followed by data; each 2
   word data entry indicates the bad spots on the disk.  The BAT Block is
   found on section 2 of a disk pack.

   Defined in:  PROLOG

                                   Format
           +-------------------------------------------------------+  --
   BATNAM  |                      SIXBIT/BAT/                      |   |
     =0    |-------------------------------------------------------|   |
   BATFRE  |  BATFR                    |                           |   |
     =1    |     Free blocks left      |                           |   |
           |-------------------------------------------------------|   |
           |             |9  BTHCT   17|                           |
           |             | # of pairs  |                           | Header
           |             |  added by   |                           |
           |             |   mapper    |                           |   |
           |-------------------------------------------------------|   |
           |  BTMCT                                                |   |
           |              # of pairs added by monitor              |  --
           |-------------------------------------------------------|  --
           |                 Bad Block information                 | * |
           |-------------------------------------------------------| Data
           |             |9  ADD27                               35| Pair
           |             |       Address of starting sector        | * |
           |-------------------------------------------------------|  --
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           \                           .                           \
           |-------------------------------------------------------|  --
           |                                                       |   |
           |-------------------------------------------------------| Data
           |                                                       | Pair
           |-------------------------------------------------------|  --
   BATCOD  |                 Unlikely code 606060                  |
     =176  |-------------------------------------------------------|
   BATBLK  |            Sector number of the BAT block             |
     =177  +-------------------------------------------------------+










                                     7
                               MONITOR TABLES
                                BAT (Cont.)


   Data Pair 0         8          18       20  21  22           35
           +-------------------------------------------------------+
   word 1  |   BATNB    |        | BTKNM     |    |      APRNM     |
           |Bad Blks Cnt|        |Controller#|Type|   Apr Serial # |
           +-------------------------------------------------------+

                  Bits     Pointer     Content

                  0-8      BATNB       Count of Bad Blks in Pair
                 18-20     BTKNB       Massbus Controller #
                   21      BADT        Type field in BAT Pair
                 23-35     APRNM       APR Serial #

        word 2

                  Bits     

                 18-35     ADD18       Old style disk address of 
                                        starting sector
                  9-35     ADD27       New style address of 
                                        starting sector































                                     8
                               MONITOR TABLES


                                    BD

   BD represents the format of the Buffer Segment Descriptor  (BSD)  used
   to describe data buffers passed to and from the NI.

   Defined in:  PHYKNI
|  
|                                           Format                                  
|         +------------------------------------------------------------------------+ 
|         |          |    |                                |        BDSBA          |
|         |          |    |                                | Phys. seg. base addr. |
|         |------------------------------------------------------------------------| 
   BDNXA  |                       Physical next BSD address                        |   
          |------------------------------------------------------------------------| 
   BDSLN  |                             Segment length                             |   
          |------------------------------------------------------------------------| 
   BDRES  |                         Reserved for software                          |   
          +------------------------------------------------------------------------+ 

           Field BDPAC     (6-7)   Packing mode

































                                     9
                               MONITOR TABLES


                                    BP

   This table contains the byte  pointer  and  count  structure  used  by
   DECnet.   Routines  DNGUBY,DNPUBY,  and  all  related DNGUnB require a
   pointer to this type of structure.   All  byte  pointers  are  section
   local (for the moment).

   Defined in:  D36PAR

                                            Format                                  
          +------------------------------------------------------------------------+ 
   BPBPT  |                      Byte pointer to user string                       | 
          |------------------------------------------------------------------------| 
   BPBYT  |                            Byte count left                             | 
          +------------------------------------------------------------------------+ 






































                                     10
                               MONITOR TABLES


                                    BR

   This is the NI% jsys internal buffer descriptor block.

   Defined in:  NIUSR

                                            Format                                  
          +------------------------------------------------------------------------+ 
   BRNXT  |                        Pointer to next BR block                        |        
          |------------------------------------------------------------------------| 
          |               BRBSZ               |               BRPRO                |
          |            Buffer size            |           Protocol type            |
          |------------------------------------------------------------------------| 
          |               BRCP1               |               BRCP2                |
          |        Locked core page 1         |        Locked core page 2          |
          |------------------------------------------------------------------------| /\
   BRBFA  |                      Buffer address (Byte pointer)                     | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   BRBID  |                                Buffer ID                               |   
          |------------------------------------------------------------------------| 
   BRSTA  |                              Return status                             |   
          |------------------------------------------------------------------------| /\
   BRDAD  |                      Destination Ethernet address                      | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| /\
   BRSAD  |                         Source Ethernet address                        | 2 
          \                                                                        \ \/
          +------------------------------------------------------------------------+ 
























                                     11
                               MONITOR TABLES


                                    BTB

   Bit Table for Disk.  This table has mapped into  it  pointers  to  the
   file  STRNAM:<ROOT-DIRECTORY>  DSKBTTBL,  when  pages are allocated or
   deallocated from the disk unit(s) belonging to structure, STRNAM.  The
   bit table file as shown below indicates which pages are assigned (bits
   off) and which are available (bits on).

   It consists of two parts; the top half contains  the  number  of  free
   pages  for each cylinder in the structure and the bottom half contains
   a bit map (1 bit per page) for all  pages  of  each  cylinder  in  the
   structure.

   At initialization time, the following are assigned in  the  bit  table
   file:

         o  All of this structure's pages that belong to the Home blocks

         o  All of the pages in this structure's swapping space

         o  Those pages pointed to by the BAT blocks

   Defined in:  STG

                                   Format
           +-------------------------------------------------------+
           |               Free Pages on Cylinder 0                |
           |-------------------------------------------------------|
           |               Free Pages on Cylinder 1                |
           |-------------------------------------------------------|
           |                           .                           |
           |                           .                           |
           \                           .                           \
           |-------------------------------------------------------|
           |               Free Pages on Cylinder n                |
           |-------------------------------------------------------|
           |                                                       |  \
           |                                                       | Cylinder 0
           \                                                       \  /
           |-------------------------------------------------------|
           |                                                       |  \
           |                                                       | Cylinder 1
           \                                                       \  /
           |-------------------------------------------------------|
           |                           .                           |
           |                           .                           |
           \                           .                           \
           |-------------------------------------------------------|
           |                                                       |  \
           |                                                       | Cylinder n
           \                                                       \  /
           +-------------------------------------------------------+

                                     12
                               MONITOR TABLES
                                BTB (Cont.)


                                    NOTE

           In the bit map each cylinder starts on a word boundary
           and  contains as many full words as are needed for all
           of its pages.
           For Systems which have sectioning, the BTB table  does
           not  hold  the  maps  for  the  disk  bit  table file.
           Rather, the monitor maps the disk bit table file for a
           structure  into  section  4  of  the monitor's address
           space when it needs to  allocate  or  deallocate  disk
           pages.   That  is, the index block of this file is the
           page table pointed to by the monitor's section pointer
           for section 4.







































                                     13
                               MONITOR TABLES


                                    BU

   The  data  structure  BU  defines  a  bucket  in  the  DECnet-36  node
   name/number data base.

   Defined in:  SCLINK

                                            Format                                  
          +------------------------------------------------------------------------+ 
   BUNXT  |                         Pointer to next bucket                         | 
          |------------------------------------------------------------------------|        /\       
   BUNO1  |                                                                        | <NO.LEN*NRNOPB> 
          \                                                                        \        \/       
          +------------------------------------------------------------------------+ 







































                                     14
                               MONITOR TABLES


                       BUG-HLT/CHK/INF-STORAGE-AREA

   BUGHLT, BUGCHK, and BUGINF Storage Area.   This  resident  storage  is
   used  to  hold  such  information  as  the push down list, PC, ACs and
   dispatch address when a BUGHLT/BUGCHK/BUGINF occurs.  BUGSEB holds the
   pointer to the last queued up SYSERR block.  (See SYSERR-STORAGE-AREA)

   Defined in:  STG

                                   Format
           +-------------------------------------------------------+
   BUGHLT: |                           0 (PC Stored here on BUGHLT)|
           |-------------------------------------------------------|
|          |                      JRST BUGH0                       |
|          |-------------------------------------------------------|
|  XBUGHL: |               Indirect Word for BUGHLTs               |
|          |-------------------------------------------------------|
|  SVVEXM: |             Save Valid Examine in BUGTYO              |
|          |-------------------------------------------------------|
|  BUGLCK: |                Lock on BUGxxx Routines                |
|          |-------------------------------------------------------|
|  BUGCHK: |                           0 (PC Stored here on BUGCHK)|
|          |-------------------------------------------------------|
|          |                      JRST BUGC0                       |
|          |-------------------------------------------------------|
|  XBGCCH: |                 MSEC1,,BGCCHK                         |
|          |-------------------------------------------------------|
|  BUGINF: |                           0 (PC Stored here on BUGINF)|
|          |-------------------------------------------------------|
|          |                      JRST BUGI0                       |
|          |-------------------------------------------------------|
|  XBGCIN: |                 MSEC1,,BGCINF                         |
|          |-------------------------------------------------------|  
|  BUGACS: |                                                       |  / \ 
|          \                 ACs Saved on a BUGHLT                 \  # of
|          \          (Contents of ACs at time of BUGHLT)          \  ACs
|          |-------------------------------------------------------|  \ /
|  BUGACU: |               Place to Store Previous                 |  / \
|          \                     Context ACs                       \  # of
|          \                                                       \  ACs
|          |-------------------------------------------------------|  \ /
|  BUGPDL: |                    Push Down List                     |  / \
|          \                                                       \ BUGPLN
|          \                                                       \  \ /
|          |-------------------------------------------------------| 
|  BUGCNT: |          Count of BUG Blocks in SYSERR Queue          |
|          |                 (Maximum of BUGMAX=20)                | 
|          |-------------------------------------------------------| 
|  BUGNUM: |        Number of BUGCHK/INFs since STARTUP            |




                                     15
                               MONITOR TABLES
                    BUG-HLT/CHK/INF-STORAGE-AREA (Cont.)


           |-------------------------------------------------------|
   BUGSEB: |          Ptr to last queued up SYSERR Block           |
           |                due to a BUGHLT/CHK/INF                |
           |-------------------------------------------------------|
   BUGP1:  |            Temp Storage for BUGSTO Routine            |
           |-------------------------------------------------------|
   BUGP2:  |            Temp Storage for BUGSTO Routine            |
           |-------------------------------------------------------|
   BUGP3:  |            Temp Storage for BUGSTO Routine            |
           |-------------------------------------------------------|
   BUGTMS: |               Time to Store Next BUGTIM               |
           |         (Length of Interval Is BUGINT = 5 min)        |
           |-------------------------------------------------------|/ \
|  BUGTIM: |          ASCII Time & Date Stored for BUGHLT          | 4 
|          |-------------------------------------------------------|\ /
   PISAV:  |              CONI PI at time of BUGHLT                |
           |-------------------------------------------------------|
   PISVI:  |              Temp Copy of PISAV before                |
           |                   BUGLCK Acquired                     |
           +-------------------------------------------------------+
































                                     16
                               MONITOR TABLES


                                    C1

   C1 is the format of the NI Read and Read/Clear Counters command.

   Defined in:  PHYKNI

                                            Format                                  
          +------------------------------------------------------------------------+ 
   C1RID  |                               Request ID                               |   
          |------------------------------------------------------------------------| 
   C1PID  |                               Process ID                               |   
          |------------------------------------------------------------------------| 
   C1BFA  |                             Buffer address                             |   
          |------------------------------------------------------------------------| 
   C1SPI  |                           Secondary portal ID                          |   
          |------------------------------------------------------------------------| 
          | |                                 |               C1FNC                |
         *| |                                 |           Function code            |
          +------------------------------------------------------------------------+ 

           Field C1ZRO     (0-0)   Indicates counters should be zeroed
































                                     17
                               MONITOR TABLES


                                    CA

   This  table  contains  field  definitions  for  the  CTERM   character
   attributes portion of the CTERM Characteristics Message.

   Defined in:  CTERMD

                                            Format                                  

                       Character attribute structure - right justified              
          +------------------------------------------------------------------------+ 
          |                                                       | | |   | | |    |
          |                                                       | | |   | | |    | *
          +------------------------------------------------------------------------+ 

           Field CAXXX     (28-28) (Reserved Flag)

           Field CASCF     (29-29) Special Char Function (For O,R,U,V,W,X,DEL)

           Field CACEC     (30-31) Control Char Echo
                .CACCX=0   No Echo
                .CACCI=1   Image Echo
                .CACCS=2   Standard Echo
                .CACCB=3   Standard, then Image Echo

           Field CADIS     (32-32) Discard output if CLEAR OOB

           Field CAINC     (33-33) Include immed. HELLO OOB in input stream

           Field CAOOB     (34-35) Out of band handling
|               .CAOOX=0   Not out of band
|               .CAOOI=1   Immediate clear
|               .CAOOD=2   Deferred clear
|               .CAOOH=3   Immediate hello



















                                     18
                               MONITOR TABLES


                                 CB-LATSRV

   CB is the LAT circuit block data  structure.   There  is  one  circuit
   block  for  each  LAT  virtual  circuit  created since the last system
   startup.  There can be up to HNMXC connect  blocks  allocated  at  one
   time.   If  that  threshold has been reached when attempting to open a
   new virtual circuit, the monitor reuses an inactive connect  block  if
   any  are available.  Connect blocks are chained together; HN locations
   HNQAC and HNQIC contain pointers to the first and last entries on  the
   active circuit (HNQAC) and inactive circuit (HNQIC) queues.

   Defined in:  LATSRV

                                            Format                                  

                                        CIRCUIT BLOCK                               
          +------------------------------------------------------------------------+ /\
   CBLNK  |                 Queue Link words (must be first words)                 | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
          |               CBRID               |               CBLID                |
          |  Circuit handle assigned by the   |        Local circuit index         |
          |              remote               |                                    |
          |------------------------------------------------------------------------| 
        * | | | |                             |               CBCSB                |
          |     |                             |       Count since balanced         |
          |------------------------------------------------------------------------| 
          |               CBSDC               |               CBTSQ                |
          | Number of slots with data waiting |   Next transmit sequence number    |
          |------------------------------------------------------------------------| 
          |               CBRSQ               |               CBLRA                |
          |  Next expected receive sequence   |  Sequence number of last message   |
          |              number               |       ack'd by remote node         |
          |------------------------------------------------------------------------| 
   CBTIM  |                     Current value of circuit timer                     |   
          |------------------------------------------------------------------------| 
|         |               CBRTC               |               CBKAV                |
|         |     Current retransmit count      |       2* Server Keep-alive         |
|         |------------------------------------------------------------------------| 
   CBKAT  |             TODCLK last time message receieved from server             |   
          |------------------------------------------------------------------------| 
          |               CBQUA               |               CBERR                |
          |          Circuit quality          | Reason code for last time circuit  |
          |                                   |              stopped               |
          |------------------------------------------------------------------------| 
          |               CBDLL               |                                    |
          | Number of transmit buffers in the |                                    |
          |                DLL                |                                    |





                                     19
                               MONITOR TABLES
                             CB-LATSRV (Cont.)


          |------------------------------------------------------------------------| /\
   CBXBQ  |                     Queue of free transmit buffers                     | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| /\
   CBAKQ  |                      Unacknowledged queue header                       | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| /\
   CBSBQ  |                           Circuit slot queue                           | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| /\
   CBDNI  |                      NI address of remote server                       | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
          |               CBMTF               |               CBRPV                |
          |  Maximum transmit frame size for  |  Remote protocol version and ECO   |
          |              circuit              |                                    |
          |------------------------------------------------------------------------| 
          |               CBMSL               |               CBNBF                |
          |  Maximum slots allowed by remote  |    Additional transmit buffers     |
          |                                   |         allowed by remote          |
          |------------------------------------------------------------------------| 
          |               CBCTI               |               CBKTI                |
          |  Value of remote's circuit timer  |Value of remote's keep-alive timer  |
          |------------------------------------------------------------------------| 
          |               CBPTC               |               CBSTA                |
          | Product type code for remote node |       Virtual circuit state        |
          |------------------------------------------------------------------------| 
          |               CBNUM               |               CBRSC                |
          |      Remote's system number       |    Remote's system name count      |
          |------------------------------------------------------------------------| 
          |               CBRLC               |                                    |
          |   Remote's location text count    |                                    |
          |------------------------------------------------------------------------|       /\       
   CBSNM  |                          Remote's system name                          | <<ML.SNM+4>/5> 
          \                                                                        \       \/       
          |------------------------------------------------------------------------|       /\       
   CBLOC  |                    Remote's location string                            | <<ML.LOC+4>/5> 
          \                                                                        \       \/       
          +------------------------------------------------------------------------+ 

           For field CBFLG(0-2):
                   CBRRF      0    Reply requested flag
                   CBMRS      1    Must reply soon flag
                   CBMRN      2    Must reply now flag








                                     20
                               MONITOR TABLES


                                 CB-LLMOP

   DECnet counters block.

   Defined in:  LLMOP

                                            Format                                  
          +------------------------------------------------------------------------+ 
   CBID   |                      Requester ID for this block                       |        
          |------------------------------------------------------------------------| 
   CBBR   |                             Bytes received                             |        
          |------------------------------------------------------------------------| 
   CBBX   |                           Bytes transmitted                            |        
          |------------------------------------------------------------------------| 
   CBFR   |                            Frames received                             |        
          |------------------------------------------------------------------------| 
   CBFX   |                           Frames transmitted                           |        
          |------------------------------------------------------------------------| 
   CBMCB  |                        Multicast bytes received                        |        
          |------------------------------------------------------------------------| 
   CBMCF  |                       Multicast frames received                        |        
          |------------------------------------------------------------------------| 
   CBFXD  |                   Frames xmitted, initially deferred                   |        
          |------------------------------------------------------------------------| 
   CBFXS  |                    Frames xmitted, single collision                    |        
          |------------------------------------------------------------------------| 
   CBFXM  |                  Frames xmitted, multiple collisions                   |        
          |------------------------------------------------------------------------| 
   CBXF   |                           Transmit failures                            |        
          |------------------------------------------------------------------------| 
   CBXFM  |                       Transmit failure bit MASK                        |        
          |------------------------------------------------------------------------| 
   CBCDF  |                      Carrier detect check failed                       |        
          |------------------------------------------------------------------------| 
   CBRF   |                            Receive failures                            |        
          |------------------------------------------------------------------------| 
   CBRFM  |                        Receive failure bit mask                        |        
          |------------------------------------------------------------------------| 
   CBDUN  |                           Discarded unknown                            |        
          |------------------------------------------------------------------------| 
   CBD01  |                          Discarded position 1                          |        
          |------------------------------------------------------------------------| 
   CBD02  |                          Discarded position 2                          |        
          |------------------------------------------------------------------------| 
   CBD03  |                          Discarded position 3                          |        
          |------------------------------------------------------------------------| 
   CBD04  |                          Discarded position 4                          |        
          |------------------------------------------------------------------------| 
   CBD05  |                          Discarded position 5                          |        




                                     21
                               MONITOR TABLES
                              CB-LLMOP (Cont.)


          |------------------------------------------------------------------------| 
   CBD06  |                          Discarded position 6                          |        
          |------------------------------------------------------------------------| 
   CBD07  |                          Discarded position 7                          |        
          |------------------------------------------------------------------------| 
   CBD08  |                          Discarded position 8                          |        
          |------------------------------------------------------------------------| 
   CBD09  |                          Discarded position 9                          |        
          |------------------------------------------------------------------------| 
   CBD10  |                          Discarded position 10                         |        
          |------------------------------------------------------------------------| 
   CBD11  |                          Discarded position 11                         |        
          |------------------------------------------------------------------------| 
   CBD12  |                          Discarded position 12                         |        
          |------------------------------------------------------------------------| 
   CBD13  |                          Discarded position 13                         |        
          |------------------------------------------------------------------------| 
   CBD14  |                          Discarded position 14                         |        
          |------------------------------------------------------------------------| 
   CBD15  |                          Discarded position 15                         |        
          |------------------------------------------------------------------------| 
   CBD16  |                          Discarded position 16                         |        
          |------------------------------------------------------------------------| 
   CBFBE  |                         Free buffer list empty                         |        
          |------------------------------------------------------------------------| 
   CBSBU  |                       System buffer unavailable                        |        
          |------------------------------------------------------------------------| 
   CBUBU  |                        User buffer unavailable                         |        
          |------------------------------------------------------------------------| 
   CBUFD  |                        Unrecognized frame dest                         |        
          |------------------------------------------------------------------------| 
   CBXXX  |                 This word actually reserved for ucode                  |        
          |------------------------------------------------------------------------| 
   CBUNI  |                               Portal ID                                |        
          +------------------------------------------------------------------------+

















                                     22
                               MONITOR TABLES


                                 CB-SCPAR

   The DECnet-36 Connect  Block  is  used  to  describe  the  information
   present in the NSP connect initiate message.

   Defined in:  SCPAR

                                            Format                                  

                                  The Internal Connect Block                        
          +------------------------------------------------------------------------+ 
   CBNUM  |                              Node number                               |              
          |------------------------------------------------------------------------| 
   CBCIR  |                          Loopback circuit ID                           |              
          |------------------------------------------------------------------------|   /\   
   CBDST  |                       Destination end user name                        | PB.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   CBSRC  |                          Source end user name                          | PB.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|      /\      
   CBUID  |                       Source user identification                       | <<^D39+3>/4> 
          \                                                                        \      \/      
          |------------------------------------------------------------------------|      /\      
   CBPSW  |                      Access verification password                      | <<^D39+3>/4> 
          \                                                                        \      \/      
          |------------------------------------------------------------------------|      /\      
   CBACC  |                              Account data                              | <<^D39+3>/4> 
          \                                                                        \      \/      
          |------------------------------------------------------------------------|      /\      
   CBUDA  |                         End user connect data                          | <<^D16+3>/4> 
          \                                                                        \      \/      
          |------------------------------------------------------------------------| 
          |               CBUCT               |               CBPCT                |
          |        User ID byte count         |        Password byte count         |
          |------------------------------------------------------------------------| 
          |               CBACT               |               CBCCT                |
          |      Account data byte count      |      User connect data count       |
          +------------------------------------------------------------------------+














                                     23
                               MONITOR TABLES


                                 CC-LATSRV

   CC is the LAT circuit counters block.  This data structure is part  of
   the Circuit Block (CB) data structure.

   Defined in:  LATSRV

                                            Format                                  

                                       CIRCUIT COUNTERS                             
          +------------------------------------------------------------------------+ 
   CCRCV  |                           Messages received                            |                
          |------------------------------------------------------------------------| 
   CCXMT  |                          Messages transmitted                          |                
          |------------------------------------------------------------------------| 
   CCRTR  |                         Messages retransmitted                         |                
          |------------------------------------------------------------------------| 
   CCSEQ  |                    Receive message sequence errors                     |                
          |------------------------------------------------------------------------| 
   CCIMR  |                       Illegal messages received                        |                
          |------------------------------------------------------------------------| 
   CCISR  |                         Illegal slots received                         |                
          |------------------------------------------------------------------------| 
   CCRES  |                            Resource errors                             |                
          |------------------------------------------------------------------------| 
   CCMSK  |                       Illegal message error mask                       |                
          +------------------------------------------------------------------------+ 


























                                     24
                               MONITOR TABLES


                                 CC-NIPAR

   CC is the read channel counters block.  There are  two  words  in  the
   table  for each entry.  CC is used by NTCTRS for the SHOW COUNTERS and
   SHOW and ZERO COUNTERS network management functions.

   Defined in:  NIPAR

                                            Format                                  
          +------------------------------------------------------------------------+ 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCSLZ  |                        Seconds since last zeroed                       |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCBYR  |                             Bytes received                             |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCBYS  |                               Bytes sent                               |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCDGR  |                           Datagrams received                           |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCDGS  |                             Datagrams sent                             |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCMBR  |                        Multicast bytes received                        |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCMDR  |                      Multicast datagrams received                      |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCDSD  |                   Datagrams sent, initially deferred                   |   




                                     25
                               MONITOR TABLES
                              CC-NIPAR (Cont.)


          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCDS1  |                    Datagrams sent, single collision                    |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCDSM  |                   Datagrams sent multiple collisions                   |   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCSF   |                              Send failures                             |   
          |------------------------------------------------------------------------| 
   CCSFM  |                          Send failure bit mask                         | *   
          |------------------------------------------------------------------------| 
          |                         Network management data                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCRF   |                             Receive failure                            |   
          |------------------------------------------------------------------------| 
   CCRFM  |                        Receive failure bit mask                        | *   
          |------------------------------------------------------------------------| 
          |                          Network management data                       |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCUFD  |                     Unrecognized frame destination                     |   
          |------------------------------------------------------------------------| 
          |                          Network management data                       |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCDOV  |                              Data overrun                              |   
          |------------------------------------------------------------------------| 
          |                          Network management data                       |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCSBU  |                        System buffer unavailable                       |   
          |------------------------------------------------------------------------| 
          |                          Network management data                       |
          |                                                                        |
          |------------------------------------------------------------------------| 
   CCUBU  |                          User buffer unavailable                       |   
          +------------------------------------------------------------------------+ 







                                     26
                               MONITOR TABLES
                              CC-NIPAR (Cont.)


           0                     23 24 25 26 27 28 29 30 31 32          35
          +---------------------------------------------------------------+
   CCSFM  |                        |  |  |  |  |  |  |  |  |              |
          +---------------------------------------------------------------+

           Symbol    Bit     Contents

           CCLOC      24     Loss of carrier
           CCXBP      25     Xmit buffer parity error
           CCRFD      26     Remote failure to defer
           CCXFL      27     Xmitted frame too long
           CCOC       28     Open circuit
           CCSC       29     Short circuit
           CCCF       30     Collision detect check failed
           CCEXC      31     Excessive collisions

           0                              26 27 28 29 30 31 32         35
          +---------------------------------------------------------------+
   CCRFM  |                                 |  |  |  |  |  |              |
          +---------------------------------------------------------------+

           Symbol    Bit     Contents

           CCFLE      27     Free list parity error
           CCNFB      28     No free buffers
           CCFTL      29     Frame too long
           CCFER      30     Framing error
           CCBCE      31     Block check error
























                                     27
                               MONITOR TABLES


                                    CD

   This is the DECnet remote console command data area; the  data  buffer
   is supplied by the user.

   Defined in:  LLMOP

                                            Format                                  

                            Remote Console Command Data Output MSD                  
          +------------------------------------------------------------------------+   /\   
   CDMSD  |                                                                        | MD.LEN 
          \                                                                        \   \/   
          +------------------------------------------------------------------------+







































                                     28
                               MONITOR TABLES


                                    CDB

   Channel Data Block.  This table, one  per  channel,  contains  channel
   dependent instructions and data, pointers to the units (that is, UDBs)
   belonging to the channel and information about  the  currently  active
   unit.   When  the  channel interrupts, control passes (by way of a JSP
   instruction) to CDBINT.  The CDB address is stored in AC, P1, and  the
   principal analysis routine, PHYINT, is called.

   Defined in:  PHYPAR

                                   Format
           +-------------------------------------------------------+
   CDBINT  |                       0(2-word PC stored on interrupt)|
           |-------------------------------------------------------|
       -5  |                       0                               |
           |-------------------------------------------------------|
       -4  |               (Flags) 0                               |
           |-------------------------------------------------------|
       -3  |                       0,, .+1                         |
           |-------------------------------------------------------|
       -2  |                 MOVEM P1, .+2+CDBSVQ                  |
           |-------------------------------------------------------|
       -1  |                   JSP P1, PHYINT                      |
           |-------------------------------------------------------|
   CDBSTS=0|         Status and Configuration Information          | *
           |-------------------------------------------------------|
   CDBMBW=1|        Memory Bandwidth Scheduling Information        |
           |-------------------------------------------------------|
   CDBODT  |        Overdue Timer when Data Transfer Active        |
           |-------------------------------------------------------|
   CDBICP  |           EXEC Virtual Adrs (EPT Adrs) of             |
           |          Interrupt Vector,, Data Logout Area          |
           |-------------------------------------------------------|
   CDBIUN  |          Initial AOBJN Pointer to  UDB Table          |
           |-------------------------------------------------------|
   CDBCUN  |          Current AOBJN Pointer to UDB Table           |
           |-------------------------------------------------------|
   CDBDSP  |  Unit Utilities Dispatch  |    Main Entry Dispatch    |
           |                           |  (Channel Dispatch Table) | *
           |-------------------------------------------------------|
   CDBFCT  |              Fairness Count for Latency               |
           |-------------------------------------------------------|
   CDBPAR  |             Channel Memory Parity Errors              |
           |-------------------------------------------------------|
   CDBNXM  |                     Channel NXMs                      |
           |-------------------------------------------------------|
   CDBXFR  |              Currently Transferring UDB               |
           |-------------------------------------------------------|
   CDBCCL  \            Channel Command List (3 words)             \



                                     29
                               MONITOR TABLES
                                CDB (Cont.)


           |-------------------------------------------------------|
|          |                                                       |
|  CDBUDB  |                KDB or UDB Table (16 words)            |
|          \                                                       \
           |-------------------------------------------------------|
   CDBSVQ  |        P1 Saved Here on Vector Interrupt Entry        |
           |-------------------------------------------------------|
   CDBJEN  |                    BLT 17, 17   (Interrupt Dismiss)   |
           |-------------------------------------------------------|
           |                  DATA0 RH, CDBRST                     |
           |-------------------------------------------------------|
           |                   XJEN CDBINT                         |
           |-------------------------------------------------------|
   CDBRST  |                Location Used by CDBJEN                |
           |-------------------------------------------------------|
   CDBCNI  |          Channel CONI at Start of Interrupt           |
           |-------------------------------------------------------|
   CDBONR  |          Fork Who Has Channel in Maint. Mode          |
           |-------------------------------------------------------|
   CDBADR  |         Number of This Channel (CHNTAB index)         |
           |-------------------------------------------------------|
   CDBCS0  |               Channel Status 0 at Error               |
           |-------------------------------------------------------|
   CDBCS1  |                   Channel Status 1                    |
           |-------------------------------------------------------|
   CDBCS2  |                   Channel Status 2                    |
           |-------------------------------------------------------|
   CDBCC1  |                       First CCW                       |
           |-------------------------------------------------------|
   CDBCC2  |                      Second CCW                       |
           |-------------------------------------------------------|
   CDBOVR  |                  Number of Overruns                   |
           |-------------------------------------------------------|
   CDBICR  |           Initial STCR When Device Started            |
           |-------------------------------------------------------|
   CDBCL2  \             Alternate CCW List (3 words)              \
           |-------------------------------------------------------|
   CDBIRB  |              IORB to start transfer for               |
           |-------------------------------------------------------|
   CDBLUN  |      Last UDB which did transfer or positioning       |
           |-------------------------------------------------------|
   CDBCAD  |               CCW for first command                   |
           |-------------------------------------------------------|
           |               CCW for second command                  |
           |-------------------------------------------------------|
   CDBDDP  \             CDB Device Dependent Block                \
           \                                                       \
           \                                                       \
           |                                                       | *
           |                                                       |
           +-------------------------------------------------------+

                                     30
                               MONITOR TABLES
                                CDB (Cont.)


|  
|           0 1 2 3 4 5 6 7 8 9 10 11 12       25 26 28 29        35
|          +-------------------------------------------------------+
|   CDBSTS | | | | | | | | | | |  |  |  |        | PIA |   TYPE    |
|          +-------------------------------------------------------+

        Symbol    Bits     Content

        CS.OFL      0      Offline
        CS.AC1      1      Primary command active
        CS.AC2      2      Secondary command active
        CS.MAI      3      Channel is in maint. mode
        CS.MRQ      4      Maint. mode requested for a unit
        CS.ERC      5      Error recovery in progress
        CS.STK      6      Channel Support, Command Stacking
        CS.ACL      7      Alternate CCW List is Current
        CS.CWP      8      Channel write parity error detected on
                           this channel
        CS.CIP      9      This is a CI port channel
        CS.DEN     10      (CI port) DIAG TO TAKE 
                           CHANNEL is enabled
|       CS.NIP     12      This is an NI port channel
|                 26-28    PIA field
|                 29-35    Channel type field

   CDBDSP
       See Tables, UDS and CDS


   CDBDDP
       CDB Device Dependent Block for the RH20 Controller
|  
|  Defined in:  PHYH2
|  
|  CDBDDP= +-------------------------------------------------------+
|  RH2CNI  |                     CONI RH2, T1                      |
|          |-------------------------------------------------------|
|  RH2CNO  |                     CONO RH2, T2                      |
|          |-------------------------------------------------------|
|  RH2DTI  |                     DATAI RH2, T1                     |
|          |-------------------------------------------------------|
|  RH2DTO  |                     DATAO RH2, T2                     |
|          +-------------------------------------------------------+









                                     31
                               MONITOR TABLES


                                  CDBCAD

   This is the CDB Device Dependent Block for the CI or NI.

|  Defined in:  PHYPAR

              0      5 6          17 18                             36
   CDBCAD=   +--------------------------------------------------------+
   CDBFG     | CFSTA  |             | CSLDF | CSDMF                   |
             +--------------------------------------------------------+

   CFSTA

   States of the Port:

        Symbol         Port States     Port-state description

        CHNUNK              0          Unknown (system startup)
        CHNSTP              1          Stopped (and needs to be restarted)
        CHNNRL              2          Needs to have microcode reloaded
        CHNRIP              3          Microcode reload in progress
        CHNNDM              4          Needs to have dump taken
        CHNDIP              5          Dump in progress
        CHNMAI              6          Maintenance mode (owned by diagnostic)
        CHNDED              7          Dead (we are not trying to restart it)
        CHNRUN             10          Running
        CHNRLC             11          Microcode reload complete
        CHNDMC             12          Microcode dump complete

   CSLDF   Last fork that loaded the port's microcode

   CSDMF   Last fork that dumped the port's microcode

             0 1         14 15    17 18                              35
   CDBVER=  +---------------------------------------------------------+
   CDBCAD+1 | |            | CDCHN | CDVER                            |
            +---------------------------------------------------------+

        Symbol         Bits    Contents

        CDPRT           0      Port; 0 = CI; 1 = NI
        CDCHN          15-17   RH20 channel number
        CDVER          18-35   Microcode version number










                                     32
                               MONITOR TABLES
                               CDBCAD (Cont.)


|          +------------------------------------------------------------+
|  CDBLGO= |                       Logout Word 0                        |
|  CDBCC1  |                                                            |
|          |------------------------------------------------------------|
|  CDBLG1= |                       Logout Word 2                        |
|  CDBCC2  |                                                            |
|          |------------------------------------------------------------|
|  CDBLG2= |                       Logout Word 3                        |
|  CDBICR  |                                                            |
|          |------------------------------------------------------------|
|  CDBQRQ= |            Non-0 if had to requeue a request               |
|  CDBRST  |                                                            |
|          |------------------------------------------------------------|
|  CDBCTR= |       Monotonic number,,Fork which owns counters           |
|  CDBCL2  |                                                            |
|          |------------------------------------------------------------|
|  CDBFQE= |       Message,,datagram free queue error count             |
|  CDBCL2+1|                                                            |
|          |------------------------------------------------------------|
|  CDBECW= |                  CCW from PCB at error                     |
|  CDBCL2+2|                                                            |
|          +------------------------------------------------------------+






























                                     33
                               MONITOR TABLES


                             CDR-STORAGE-AREA

   Card Readers (Physical) Storage Area.  Most  entries  are  CDRN  words
   long where CDRN equals the number of card readers on the system.

   Defined in:  STG

                                   Format
           +-------------------------------------------------------+  /\
   CDRCT1: |                     Buffer Count                      | CDRN
           \                                                       \  \/
           |-------------------------------------------------------|  /\
   CDRCKT: |                Word for Scheduler Test                | CDRN
           \                                                       \  \/
           |-------------------------------------------------------|  /\
   CDRSTS: |                      Status Word                      |*CDRN
           \                                                       \  \/
           |-------------------------------------------------------|  /\
   CDRST1: |                  Second Status Word                   | CDRN
           \                                                       \  \/
           |-------------------------------------------------------|  /\
   CDRST2: |                   Third Status Word                   |*CDRN
           \                                                       \  \/
           |-------------------------------------------------------|  /\
   CARDCT: |                  Count of Cards Read                  | CDRN
           \                                                       \  \/
           |-------------------------------------------------------|  /\
   CARDER: |              Number of "Hardware" Errors              | CDRN
           \                                                       \  \/
           |-------------------------------------------------------|
   CDRLCK: |                     CDR Lock Word                     |
           |-------------------------------------------------------|
   CDRCNT: |                Count of CDRs Opened                   |
           |-------------------------------------------------------|  /\ ---
   CDUBAD: |                 Address of UBA Window                 | CDRN  |
           \                                                       \  \/   |
           |-------------------------------------------------------|  /\   |
   CD11A:  |               Address of UBA-11 Address               | CDRN
           \                                                       \  \/  KS10
           |-------------------------------------------------------|  /\  only
   CDERBF: |              Error Status for Cardreader              | CDRN
           |                                                       |  *16  |
           \                                                       \  \/   |
           |-------------------------------------------------------|  /\   |
   CDUNIT: |               Unit Number of Cardreader               | CDRN  |
           \                                                       \  \/   |
           +-------------------------------------------------------+     ---






                                     34
                               MONITOR TABLES
                          CDR-STORAGE-AREA (Cont.)


           The Non-resident area contains:

           +-------------------------------------------------------+ / \
   CDRBUF: |                                                       |  |
           |                  Card Reader Buffer                   | 1 page
           \                                                       \  |
           +-------------------------------------------------------+ \ /

            0                       17 8 9 20                    35
           +-------------------------------------------------------+
   CDRSTS  | CDFRK                    | | |  CDERR                 |
   entry   |         Owning Fork      | | |    Last Error Condition|
           +-------------------------------------------------------+

                  Bits     Pointer     Content

                   0-17    CDFRK       Owning fork
                    18     CDOL        If one, cards in reader
                    19     CDBLK       Waiting for a card
                  20-35    CDERR       Last error condition


            0 1 2 3 4 5    11 2 3 4 5 6 17 18                    35
   CDRSTS  +-------------------------------------------------------+
   entry   | | | | | |       | | | | | | |CDWRD                    |
           +-------------------------------------------------------+

                  Bits     Pointer     Content

                    0      CDAII       CDR opened in ASCII
                    1      CDATN       CDR needs attention
                    2      CDMSG       Suppress system messages
                    3      CDOPN       CDR is open
                    4      CDER        Error in this CDR
                   12      CDCNT       Count of bytes now in buffer
                   13      CDEOF       EOF button was pushed
                   14      CDBUF       Buffer for process level
                   15      CDPIR       Process needs interrupt
                   16      CDBFI       Buffer for PI level
                   17      CDDON       If one, doing a buffer by process
                  18-35    CDWRD       Current internal storage word











                                     35
                               MONITOR TABLES
                          CDR-STORAGE-AREA (Cont.)


            0 1 2 3 4 5 6 7   11 12     17 8 9 20                35
   CDRST2  +-------------------------------------------------------+
   entry   | | | | | |   |      |  CDPSI  |   |CDSST               |
           +-------------------------------------------------------+

        Symbol    Bits     Pointer     Content

        CD%SHA      0      CDSHA       "Status has arrived" flag
                    1      CDMWS       MTOPR is waiting for status to
                                        arrive
        CD%RLD      2      CDRLD       Front end has reloaded
                    3      CDOFI       Offline interrupt is pending
                    4      CDEFI       End of file interrupt 
                                        already given
                   5-6     CDRTYP      Type of card reader
                    7      CDEXST      Existance of reader
                  12-17    CDPSI       PSI chan. no. for on-line
                                        transitions
                  20-35    CDSST       Software status word


                                       Symbol  Bits   Content

                                       .DVFFE   28    Device has a
                                                       fatal, unre-
                                                       coverable error
                                       .DVFLG   29    Error logging
                                                       info. follows
                                       .DVFEF   30    EOF
                                       .DVFIP   31    I/O in progress
                                       .DVFSE   32    Software cond.
                                       .DVFHE   33    Hardware error
                                       .DVFOL   34    Offline
                                       .DVFNX   35    Nonexistent device


















                                     36
                               MONITOR TABLES


                                    CDS

   Channel Dispatch Service Routine Table.  This table contains  vectored
   addresses  to  channel  dependent  functions,  and  is  given  in  its
   generalized form.  The channel dispatch table for the  RH20  and  RH11
   begins  at  RH2DSP.  See PHYPAR for definitions of arguments given and
   returned on calls to these channel routines.

   Defined in:  PHYPAR

                                   Format
            +-------------------------------------------------------+
   CDSINI=0 |          Initialize and Build Data Structure          |
            |-------------------------------------------------------|
   CDSSTK=1 |Stack Second Channel Command, Skip if OK(fails if RH11)|
            |-------------------------------------------------------|
   CDSSIO=2 |       Start I/O on IORB (skip if started O.K.)        |
            |-------------------------------------------------------|
   CDSPOS=3 |     Do Positioning to Idle Unit (skips if O.K.)       |
            |-------------------------------------------------------|
   CDSLTM=4 |  Return Latency and Best Request (that is, best IORB) |
            |-------------------------------------------------------|
   CDSINT=5 |                    Interrupt Entry                    |
            |-------------------------------------------------------|
   CDSCCW=6 |               Generate Single CCW Entry               |
            |-------------------------------------------------------|
   CDSHNG=7 |                      Hung Reset                       |
            |-------------------------------------------------------|
   CDSRST=10|       On Restart, Reset Channel and All Devices       |
            |-------------------------------------------------------|
   CDSCHK=11|            Periodic Check Entry, PIA, ...             |
            |-------------------------------------------------------|
   CDSEXT=12|      Check legality of a unit (skip if existent)      |
            |-------------------------------------------------------|
   CDSSCA=13|            Extract address from CCW entry             |
            +-------------------------------------------------------+

















                                     37
                               MONITOR TABLES


                                    CF

   This table defines the structure of the wait check tables.

   Defined in:  SCLINK

                                            Format                                  
           0 1                 11 12 13 
          +------------------------------------------------------------------------+ 
          | |                     | |         |               CFTST                | *
          | |                     | |         | Local address of tester function   |
          +------------------------------------------------------------------------+ 

           Field CFIFI     (0-0)   The sign bit is reserved for IFIW flg

           Field CFCHN     (12-12) Set if a channel is req'd for this fcn





































                                     38
                               MONITOR TABLES


                                  CFHSHT

   This table is  the  CFS  resource  hash  table  and  it  contains  the
   addresses  of CFS resource blocks.  The hash number used to index into
   the table is a combination of the root and qualifier of the  resource.
   Collisions  are  linked  off  of  the forward pointer of each resource
   block.

   Defined in:  STG

   Index:          Hash number calculated  from  root  and  qualifier  of
                   resource

           +-------------------------------------------------------+
           |              Address of CFS resource block            |   / \
           |-------------------------------------------------------|    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |     
           |                                                       |  HSHLEN
           |                                                       |     
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           \                                                       \    |
           +-------------------------------------------------------+   \ /























                                     39
                               MONITOR TABLES


                                  CFHSTS

   This table contains the status of each connection that CFS has.   This
   table is parallel to CFSHST.

   Defined in:  STG

            0                     17 18                        35
           +------------------------------------------------------+
           |       Connection state |   Node type                 | * / \
           |                        |                             |    |
           |------------------------------------------------------|    |
           |                                                      |    |
           |                                                      |    |
           |                                                      |    |
           |                                                      |    |
           |                                                      |
           |                                                      | HSTSIZ
           |                                                      |   
           |                                                      |    |
           |                                                      |    |
           |                                                      |    |
           |                                                      |    |
           |                                                      |    |
           \                                                      \    |
           +------------------------------------------------------+   \ /

   Connection State:

        -1 ---  When connection is fully open
        0  ---  When connection is being opened
        1B0 --  This bit is turned off when a disconnect happens and the 
                interlock is set.
        1B17 -  This bit is turned off to indicate a lack of credit.

   Node Type:

        -1 ---  Full CFS node
        0  ---  Not full CFS node














                                     40
                               MONITOR TABLES


                                  CFNNAM

   This table contains the node names of the processors to which  CFS  on
   this system is connected.

   Defined in:  STG

           +------------------------------------------------------+
           \  8-bit ASCII node name of CPU connected through CFS  \  / \
           \                                                      \
           |------------------------------------------------------|   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |
           |                                                      | HSTSIZ*2
           |                                                      |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           \                                                      \   |
           +------------------------------------------------------+  \ /




























                                     41
                               MONITOR TABLES


                                  CFSHNM

   This table contains the serial numbers of the processors to which  CFS
   on  this system is connected.  This table is parallel to CFSHST (where
   the connect ID can be found for the connection).

   Defined in:  STG

           +------------------------------------------------------+
           | Processor serial number of CPU connected through CFS |  / \
           |------------------------------------------------------|   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |
           |                                                      | HSTSIZ
           |                                                      |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           \                                                      \   |
           +------------------------------------------------------+  \ /




























                                     42
                               MONITOR TABLES


                                  CFSHST

   This table contains the connection ID for  each  connection  that  CFS
   has.   The  number  of  connections  that CFS currently has is kept in
   location CFSHCT.  CFSHCM contains the count of full voting hosts.

   Defined in:  STG

           +------------------------------------------------------+
           |     CID of connection or -1 if this is a listener    |  / \
           |------------------------------------------------------|   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |
           |                                                      | HSTSIZ
           |                                                      |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           \                                                      \   |
           +------------------------------------------------------+  \ /




























                                     43
                               MONITOR TABLES


                                  CFSOFN

   This table, indexed by OFN, contains the address of the  CFS  resource
   block which describes this system's access to that OFN.

   Defined in:  STG

   Index:  OFN

           +------------------------------------------------------+
           |     Address of CFS resource block describing OFN     |  / \
           |------------------------------------------------------|   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |
           |                                                      | NOFN
           |                                                      |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           \                                                      \   |
           +------------------------------------------------------+  \ /



























                                     44
                               MONITOR TABLES


                            CFS RESOURCE BLOCK

   This is the format of  the  CFS  resource  block.   This  block  fully
   describes  a  resource  known to CFS.  The root and qualifier uniquely
   describe the resource.  The base address  of  the  hash  table  (which
   contains these resource blocks) is contained in CFHSHT.

|  Defined in:  CFSPAR

              +-------------------------------------------------------+
   HSHLNK=0   |              Link to next resource block              |
              |-------------------------------------------------------|
   HSHROT=1   |                         Root                          |
              |-------------------------------------------------------|
   HSHQAL=2   |                       Qualifier                       |
              |-------------------------------------------------------|
   HSHTIM=3   |        Time stamp when the resource was granted       |
              |-------------------------------------------------------|
   HSFLAG=4   |                  Flags for resource                   |*
              |-------------------------------------------------------|
   HSHCOD=5   |                Unique code used for ID                |
              |-------------------------------------------------------|
   HSHPST=6   |Post address for when resource is released (call-back) |
              |-------------------------------------------------------|
              |              11 |      17 |                           |
   HSHVWD=7   |   HSHLKF        |HSHVCT   |         HSHUNQ            |
              |   Lock field    |Votes in |         Vote code         |
              |-------------------------------------------------------|
   HSHVRW=10  |                           |    HSHDRC                 |*
              |    Reserved               |    Denial reason code     |
              |-------------------------------------------------------|
   HSHNBT=11  |    Node bit table (nodes to contact upon release)     |
              |-------------------------------------------------------|
   HSHRET=12  |  Return address used for removal (SHTADD or LNGADD)   |
              |-------------------------------------------------------|
   HSHDVD=13  | HSHRHN                    |         HSHVVL            |
              | Dest port number of commit|         Vote code         |
              |-------------------------------------------------------|
   HSHMSK=14  |        HSHDLY             |        HSHFRK             |
              |        Delay mask         |        Owning fork        |
              |-------------------------------------------------------|
   HSHOPT=15  |                Optional data from vote                |
              |-------------------------------------------------------|
   HSHOP1=16  |         Transaction number for optional data          |
              |-------------------------------------------------------|
   HSHOKV=17  |       Call-back routine for when a vote is OKed       |
              |-------------------------------------------------------|
   HSHCDA=20  |      Call-back routine for optional data in vote      |
              |-------------------------------------------------------|
   HSHFCT=21  |                    Fairness timer                     |



                                     45
                               MONITOR TABLES
                         CFS RESOURCE BLOCK (Cont.)


              |-------------------------------------------------------|
   HSHWTM=22  |                    Vote retry time                    |
              |-------------------------------------------------------|
   HSHBKP=23  |                     Back pointer                      |
              |-------------------------------------------------------|
   HSHBTT=25  |  First word of hash bit table (for directory locks)   |
              |-------------------------------------------------------|
              \                                                       \
     HSHDRI   \          Additional words for hash bit table          \
              \                                                       \
              +-------------------------------------------------------+

              +-------------------------------------------------------+
   HSFLAG=4   |                  Flags for resource                   |
              |-------------------------------------------------------|


                             Contents of HSFLAG

        Symbol       Bits    Meaning

        HSHWVT       0       If on, we are voting
        HSHYES       1       Yes/No vote (1 if anyone said no)
        HSHTYP       2-5     Type of entry
        .HTPLH=0             Place-holder entry
        .HTOAD=1             Owned for full sharing
        .HTOSH=2             Owned Read-Only shared
        .HTOEX=3             Owned exclusively
        .HTOPM=4             Owned for Promiscous read
        HSHTWF       6       "Token" wait flag
        HSHRTY       7       Retry now bit
        HSHLSG       8       Entry being released
        HSHVRS       9       Vote restart flag
        HSHLOS       10      Long/Short flag (1 if block is long)
        HSHUGD       11      Voting for an upgrade
        HSHODA       12      Optional data valid
        HSHKPH       13      Don't purge this entry
        HSHVTP       14-17   Type we are voting on
        HSHDWT       18      If here, waiting for delay to be up
        HSVUC        19      Bit to indicate vote must include HSHCOD
        HSHLCL       20      Local exclusive
        HSHRFF       21      For tokens only
        HSHAVT       22      Vote on all nodes, even reduced CFS nodes
        HSHBTF       23      If set, this is a bit-table file
        HSHCNT       24-35   Count of sharers







                                     46
                               MONITOR TABLES
                         CFS RESOURCE BLOCK (Cont.)



              |-------------------------------------------------------|
   HSHVRW=10  |                           |    HSHDRC                 |
              |     Reserved              |    Denial reason code     |
              |-------------------------------------------------------|

                          Contents of field HSHDRC

        Symbol       Value   Meaning

        .CDDWT       1       We are in VOTDWT
        .CDVUC       2       HSHCODs are unequal
        .CDYUX       3       We are voting, HSHYES set, we have .HTOEX
        .CDYUN       4       We are voting, HSHYES set, unequal access
        .CDVDL       5       We are voting, HSHDLY set
        .CDVLN       6       We are voting, tie, our serial   bigger
        .CDVUX       7       We are voting, tie, HSHUGD set, he wants .HTOEX
        .CDVUN       10      We are voting, tie, HSHUGD set, unequal access
        .CDOCT       11      We own resource, conflicting access, HSHCNT set
        .CDOFC       12      We own resource, conflicting access, HSHFCT valid
































                                     47
                               MONITOR TABLES


                                     CFSSTR

        This table, indexed by structure number, contains the transaction
        number for the structure free count of each structure.

        Defined in:  STG

        Index:  Structure number

           +------------------------------------------------------+
           |      Transaction number for structure free count     |  / \
           |------------------------------------------------------|   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |
           |                                                      | STRN
           |                                                      |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           |                                                      |   |
           \                                                      \   |
           +------------------------------------------------------+  \ /



























                                     48
                               MONITOR TABLES


                            CFS VOTER MESSAGE BUFFER

        This is the format of the text area of the message packet sent by
        CFS  upon  a  vote request or reply.  It does not include the SCA
        header, which appears above the  first  word  of  the  text  area
        (SCALEN).

        Defined in:     CFSSRV

                   +-------------------------------------------------------+
        SCALEN=11  |   CFFLG     |  CFCOD      |       CFUNQ               |
                   |    Flags    |   Opcode    |        Unique code        |*
                   |-------------------------------------------------------|
        CFROT=12   |                         Root                          |
                   |-------------------------------------------------------|
        CFQAL=13   |                       Qualifier                       |
                   |-------------------------------------------------------|
        CFTYP=14   |               Access required or answer               |
                   |-------------------------------------------------------|
        CFDAT=15   |         Optional data (OFNLEN or retry time)          |
                   |-------------------------------------------------------|
        CFDT1=16   |         Transaction number for optional data          |
                   |-------------------------------------------------------|
        CFDST0=17  |           Structure free count in bit table           |
                   |-------------------------------------------------------|
        CFDST1=20  |      Transaction number for structure free count      |
                   |-------------------------------------------------------|
        CFVGRD=21  |     CFGWD                 |      CFDRC                |
                   | Guard word (for debugging)|    Denial reason code     |
                   +-------------------------------------------------------+


                   +-------------------------------------------------------+
        SCALEN=11  |   CFFLG     |  CFCOD      |       CFUNQ               |
                   |    Flags    |   Opcode    |        Unique code        |
                   +-------------------------------------------------------+

                          Contents of FLAGS field

        Symbol         Bits            Meaning

        CFODA           0              Optional data present
        CFVUC           1              Vote to include HSHCOD










                                     49
                               MONITOR TABLES
                      CFS VOTER MESSAGE BUFFER (Cont.)


                          Contents of OPCODE field

        Symbol         Value           Meaning

        .CFVOT           1             Vote request
        .CFREP           2             Reply to vote request
        .CFRFR           3             Resource freed
        .CFCEZ           4             Seize resource
        .CFBOW           5             Broadcast of OFN change
        .CFBEF           6             Broadcast end-of-file info
        .CFTAD           7             Time and date arrived
        .CFSHT          10             Shutdown of system is pending
|       .CFENQ          11             Cluster ENQ message

   See the description of the HSHDRC field in the CFS Resouce Block table
   for the possible value of the denial reason code field (CFDRC).




































                                     50
                               MONITOR TABLES


                                 CH-CTERMD

   This is the CTERM Connection Data Block.  One  CTERM  Connection  Data
   Block exists for each active CTERM connection.

   Defined in:  CTERMD

                                            Format                                  

                         Per connection CTERM data base - same as CDB                
          +------------------------------------------------------------------------+ 
   CHIMB  |                 Address of CTERM message input buffer                  | 
          |------------------------------------------------------------------------| 
   CHUID  |                  Unique ID (used for stale detection)                  | 
          |------------------------------------------------------------------------| 
   CHCO1  |                   Last CCOC word (1) sent to server                    | 
          |------------------------------------------------------------------------| 
   CHCO2  |                   Last CCOC word (2) sent to server                    | 
          |------------------------------------------------------------------------| 
   CHBR1  |                Last break mask (word 1) sent to server                 | 
          |------------------------------------------------------------------------| 
   CHBR2  |                Last break mask (word 2) sent to server                 | 
          |------------------------------------------------------------------------| 
   CHBR3  |                Last break mask (word 3) sent to server                 | 
          |------------------------------------------------------------------------| 
   CHBR4  |                Last break mask (word 4) sent to server                 | 
          |------------------------------------------------------------------------| 
   CHRFL  |                            START-READ flags                            | 
          |------------------------------------------------------------------------| 
          |               CHLIN               |               CHCHL                |
          |           TOPS-20 TTY #           |      DECnet36 channel number       |
          |------------------------------------------------------------------------| 
          |               CHINC               |               CHSTS                |
          | Count of bytes in input buffer    |   Current status of DECnet link    |
          |------------------------------------------------------------------------| 
          |               CHSTA               |               CHSSZ                |
          | Current CTERM state for this TTY  |   Maximum protocol message size    |
          |------------------------------------------------------------------------| 
          |               CHMAX               |               CHRLN                |
          |    Maximum input buffer length    |         START-READ length          |
          |------------------------------------------------------------------------| 
          |               CHRID               |               CHRBL                |
          |   Remote host ID (node address)   |    ^R Buffer length (0<RBFCNT)     |
          |------------------------------------------------------------------------| 
          | | | | | | | | | | | |             | | | |                              | *
          |               CHFLG               |               CHFL1                |
          |------------------------------------------------------------------------|      /\      
   CHRBF  |                                                                        | <<RBFCNT>/5> 
          \                                                                        \      \/      
|         |------------------------------------------------------------------------|      /\
|         |                              Remote username string                    |      10
|         +------------------------------------------------------------------------+      \/

                                     51
                               MONITOR TABLES
                             CH-CTERMD (Cont.)


           For field CHFLG(0-17):
                   CHRDA      0    A read request is active in the server.
                   CHMRD      1    There is input data available in the server
                   CHSSD      2    Set "do not discard" in the next write message
                   CHDSO      3    Discard output (control-O is in effect)
                   CHRCX      4    CR-LF forced on in server's break mask
                   CHCLI      5    Clear input buffer 
                   CHASR      6    Send another START-READ
                   CHCOC      7    Send CCOC words
                   CHTCI      8    Sending input characters to TTYSRV
                   CHCTM      9    CTERM INITIATE message has been received
                   CHBIN      10   Last message sent to server was Transparent (binary)

           For field CHFL1(18-35):
                   CHEDT      18   Remote server supports editing
                   CHLWI      19   Remote server supports line width setting
                   CHRTI      20   Remote server supports remote TEXTI% prompts



































                                     52
                               MONITOR TABLES


                                 CH-D36COM

   This  table  defines  the  memory-manager  data  base  for   DECnet-36
   pre-allocated message blocks and buffers.

   Defined in:  D36COM

                                            Format                                  

                                    Core handler structure                          
          +------------------------------------------------------------------------+ 
   CHBOT  |                       Pointer to free pool start                       | 
          |------------------------------------------------------------------------| 
   CHPTR  |                      pointer to first free block                       | 
          |------------------------------------------------------------------------| 
   CHAVL  |                       Number of available blocks                       | 
          |------------------------------------------------------------------------| 
          |               CHLWM               |               CHREQ                |
          |          Low water mark           |          Size requested            |
          |------------------------------------------------------------------------| 
          | |              CHNUM              |               CHSIZ                |
          | |  Total blocks, alloc & unalloc  |          Size of blocks            |
          +------------------------------------------------------------------------+ 

          Field CHCON     (0-0)   Set if this block type subject to congestion




























                                     53
                               MONITOR TABLES


                                 CH-LLMOP

   This is the DECnet remote console LLMOP header MSD.

   Defined in:  LLMOP

                                            Format                                  

                                        MSD for header                              
          +------------------------------------------------------------------------+ 
   CHIDD  |                 ID word to hack for Transmit Complete                  |        
          |------------------------------------------------------------------------|   /\   
   CHMSD  |                                                                        | MD.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|       /\       
   CHDAT  |                 Room for Largest Remote Console header                 | <<RCH.LN+3>/4> 
          \                                                                        \       \/       
          +------------------------------------------------------------------------+



































                                     54
                               MONITOR TABLES


                                  CHNTAB

   Channel Table contains channel data block (CDB) pointers.

   Defined in:  STG

   Index:  Channel Number

                                   Format
           +-------------------------------------------------------+  / \
   CHNTAB: |                      CDB Pointer                      |   |
           |-------------------------------------------------------|   |
           |                           .                           |
           |                           .                           |  CHNN
           |                           .                           |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /



































                                     55
                               MONITOR TABLES


                                  CICMST

   This table contains the status of the oldest MSCP driver  command  for
   each connection.  This is the status returned from the server.  If the
   number does not decrease after each GCS command, we assume the  remote
   is dead.

   Defined in:  PHYMSC

   Index:  Server connect id.

           +-------------------------------------------------------+
   CICMST  |                      GCS count                        |   / \
           |-------------------------------------------------------|    |
           |                                                       |    |
           |                                                       |    |
           /                                                       / CTABSZ
           /                                                       /    |
           |                                                       |    |
           |                                                       |    |
           +-------------------------------------------------------+   \ /
































                                     56
                               MONITOR TABLES


                                  CIDATA

   This table contains the state of the  MSCP  driver  connection  during
   initialization   and,   after   initialization,   the  status  of  the
   connection.

   Defined in:  PHYMSC

   Index:  Server connect id.

                 +-------------------------------------------------------+
   CIDATA        |                      Status word                      | *
                 |-------------------------------------------------------|  
                 |                                                       |  / \ 
                 |                                                       |   |
                 /                                                       /   | 
                 /                                                       / CTABSZ
                 |                                                       |   |
                 |                                                       |   |
                 +-------------------------------------------------------+  \ /

   Status word:    0  1  2  3  4  5  6  7  8
                 +-------------------------------------------------------+
                 |  |  |  |  |  |  |  |  |                               |
                 +-------------------------------------------------------+

        Symbol    Bits     Content

        DT.TAP     0       Controller is a tape drive (must be sign bit)
        DT.GAW     1       Node has gone away (connection broken)
        DT.GCS     2       A GCS command is outstanding
        DT.IDC     3       We have initiated a disconnect
        DT.IRC     4       We have initiated a reconnect
        DT.DIS     5       Other side has initiated a disconnect
        DT.DI1     6       Already tried disconnect once
        DT.NXU     7       First pass next unit test
        DT.KL      8       Remote is KL
















                                     57
                               MONITOR TABLES


                           CI RELATED VARIABLES

|  This is a list of various CI related variables in  SCAMPI.   They  are
|  not stored in this contiguous format.
|  
|  Defined in:     SCAMPI

           +-------------------------------------------------------+
   TOPFQ:  |         Address of top of message free queue          |
           |-------------------------------------------------------|
   BOTFQ:  |        Address of bottom of message free queue        |
           |-------------------------------------------------------|
   FQCNT:  |        Count of buffers on message free queue         |
           |-------------------------------------------------------|
   TOPDC:  |         Address of top of "don't care" queue          |
           |-------------------------------------------------------|
   BOTDC:  |        Address of bottom of "don't care" queue        |
           |-------------------------------------------------------|
   TOPDFQ: |         Address of top of datagram free queue         |
           |-------------------------------------------------------|
   BOTDFQ: |       Address of bottom of datagram free queue        |
           |-------------------------------------------------------|
   DFQCNT: |        Count of buffers on datagram free queue        |
           |-------------------------------------------------------|
   SBCNT:  |                Number of system blocks                |
           |-------------------------------------------------------|
   NOTTAB: |             Address of notification table             |
           |-------------------------------------------------------|
   NOTEND: |         Address of end of notification table          |
           |-------------------------------------------------------|
   UNQBTS: |      Uniqueness bits to be assigned to next CID       |
           |-------------------------------------------------------|
   UNQRFL: |  Number of times uniqueness bits have been recycled   |
           |-------------------------------------------------------|
   NXTIDX: |          Next free index into table of CID's          |
           |-------------------------------------------------------|
   CIDRFL: |       Number of times CIDTAB has been recycled        |
           |-------------------------------------------------------|
   CIDTAB: |         Base address of the CID address table         | 
           |-------------------------------------------------------|
   UBTTAB: |     Base address of the CID uniqueness bits table     |
           |-------------------------------------------------------|
   SBSTUK: |Bit mask indicating which systems are stuck on buffers |
|          |-------------------------------------------------------|
|  RAPTIM: |                 Timer for SCA                         |
|          |-------------------------------------------------------|
|  RAPINC: | Min. time increment in milliseconds between reap runs |
           |-------------------------------------------------------|
   RNGSW:  |    Indicates which ring buffer events are recorded    |




                                     58
                               MONITOR TABLES
                        CI RELATED VARIABLES (Cont.)


|          |-------------------------------------------------------|
|          |                                                       |/\
|  SNDTAB: |                Table of packets sent                  |.STLST
|          |                                                       |\/
|          |-------------------------------------------------------|
|          |                                                       |/\
|  RECTAB: |              Table of packets received                |.STLST
|          |                                                       |\/
           |-------------------------------------------------------|
   LISTEN: |                  Number of listeners                  |
           |-------------------------------------------------------|
   RCBCNT: |        Number of connections deleted by reaper        |
           |-------------------------------------------------------|
   TMGCNT: |      Count of systems timed out by idle chatter       |
           |-------------------------------------------------------|
   TMGSBI: |  Current system under investigation by idle chatter   |
|          |-------------------------------------------------------|
|  TMGTIM: |           Timeout period for idle chatter             |
           |-------------------------------------------------------|
   MBPS:   |       Minimum message buffers per system block        |
           |-------------------------------------------------------|
   MBCR:   |       Minimum datagram buffers per system block       |
           |-------------------------------------------------------|
   MINMSG: | Minimum number of message buffers which should exist  |
           |-------------------------------------------------------|
   MINDG:  | Minimum number of datagram buffers which should exist |
           |-------------------------------------------------------|
   NMBCNT: |     Count of times we ran out of message buffers      |
           |-------------------------------------------------------|
   NDBCNT: |     Count of times we ran out of datagram buffers     |
           |-------------------------------------------------------|
   TOTMGB: |     Total number of message buffers ever created      |
           |-------------------------------------------------------|
   TOTDGB: |     Total number of datagram buffers ever created     |
|          |-------------------------------------------------------|
|  MBUST:  |      Number of times a small request was honored      |
|          |              Even under message threshold             |
|          |-------------------------------------------------------|
|  DBVST:  |      Number of times a small request was honored      |
|          |             Even under datagram threshold             |
           |-------------------------------------------------------|
   DMRCNT: |      Number of message buffer requests deferred       |
           |-------------------------------------------------------|
   DDRCNT: |      Number of datagram buffer requests deferred      |
           |-------------------------------------------------------|
   RMRCNT: |       Number of message buffer requests refused       |
           |-------------------------------------------------------|
   RDRCNT: |      Number of datagram buffer requests refused       |




                                     59
                               MONITOR TABLES
                        CI RELATED VARIABLES (Cont.)


           |-------------------------------------------------------|
   ASRMR:  |        Average size of refused message request        |
           |-------------------------------------------------------|
   ASRDR:  |       Average size of refused datagram request        |
|          |-------------------------------------------------------|
|  LRGREQ: | Buffer requests of less than this size are small req. |
|          |-------------------------------------------------------|
|  MGTRSH: |                    MSG Threshold                      |
|          |     SC.ABF does not allocate a large request *        |
|          |-------------------------------------------------------|
|  DGTRSH: |                     DG Threshold                      |
|          |     SC.ALD does not allocate a large request *        |
|          +-------------------------------------------------------+
|  
|  *       A large reuest is any request larger than 2.





































                                     60
                               MONITOR TABLES


                          CLASS-SCHEDULER-STORAGE

   This storage is used by the class scheduling algorithms.

   Defined in:  STG

   Index:  A number of the sections are indexed by either class (sections
           of length MAXCLS) or by job number (sections of length NJOBS).


                                   Format
           +-------------------------------------------------------+
   MJBUSE: |                  Highest job in use                   |
           +-------------------------------------------------------+
   RDRTIM: |                Time to do next reorder                |
           +-------------------------------------------------------+
   UTLTIM: |              Time to compute utilization              |
           +-------------------------------------------------------+
   UTLINT: |         Interval to compute next utilization          |
           +-------------------------------------------------------+
   OLDSLD: |                  Previous sold time                   |
           +-------------------------------------------------------+
   OLDIDL: |                  Previous idle time                   |
           +-------------------------------------------------------+
   CLASSF: |         If non-zero, doing classy scheduling          |
           +-------------------------------------------------------+
   CLSCTL: |                  Class control word                   | * 
           +-------------------------------------------------------+
   CLSUTL: |                                                       | /\
           |                   Class utilization                   | MAXCLS
           \                           .                           \ \/
           +-------------------------------------------------------+
   JOBCLS: |                                                       | /\
           |                     Class per job                     | NJOBS
           \                           .                           \ \/
           +-------------------------------------------------------+
   JOBUTL: |                                                       | /\
           |                    Job utilization                    | NJOBS
           \                           .                           \ \/
           +-------------------------------------------------------+
   JOBIRT: |                                                       | /\
           |                Job incremental runtime                | NJOBS
           \                           .                           \ \/
           +-------------------------------------------------------+
   JOBDST: |                                                       | /\
           |                     Job distance                      | NJOBS
           \                                                       \ \/
           +-------------------------------------------------------+
   CLSSHR: |                                                       | /\
           |                      Class share                      | MAXCLS
           \                           .                           \ \/


                                     61
                               MONITOR TABLES
                      CLASS-SCHEDULER-STORAGE (Cont.)


           +-------------------------------------------------------+
   CLSSWA: |                                                       | /\
           |              Windfall allocation (or -1)              | MAXCLS
           \                           .                           \ \/
           +-------------------------------------------------------+
   CLSSHI: |                                                       | /\
           |                   Share per member                    | MAXCLS
           \                           .                           \ \/
           +-------------------------------------------------------+
   CLSCNT: | CLGLC                     |                           | / \
           |    Count of processes     |                           | MAXCLS
           |    on GOLST per class     |                           |  |
           \                           .                           \ \ /
           +-------------------------------------------------------+
   CLSDST: |                                                       | /\
           |                    Class distance                     | MAXCLS
           \                           .                           \ \/
           +-------------------------------------------------------+
   CLSSUM: |                                                       | /\
           |             Integral of NRUN for classes              | MAXCLS
           \                           .                           \ \/
           +-------------------------------------------------------+
   CLSIRT: |                                                       | /\
           |               Class incremental runtime               | MAXCLS
           \                           .                           \ \/
           +-------------------------------------------------------+


            0 1          9 10         18 19 20     25 26         36
           +-------------------------------------------------------+
   CLSCTL  | |   CLSDF    |    CLSBT    |  |  CLSKV  |             |
   entry   +-------------------------------------------------------+

                  Bits     Pointer     Content

                   0       CLSBD       BATCH jobs to dregs queue
                  1-9      CLSDF       Default class
                 10-18     CLSBT       Batch class
                  19       CLSAC       If on, class by accounts
                 20-25     CLSKV       Current knob value












                                     62
                               MONITOR TABLES


|                                 CLUHST
|  
|  This table  contains  information  CLUDGR  uses  when  it  receives  a
|  connection to its listener.  CLUHST is a maximum of HSTSIZ words long.
|  HSTSIZ is defined in STG.
|  
|  Defined in:  CLULSN
|  
|          +-------------------------------------+  /|\
|  CLUHST: |  -1 if listening, or connect ID     |   |
|          +-------------------------------------+ HSTSIZ
|          \                                     \   |
|          \                                     \   |
|          +-------------------------------------+  \|/







































                                     63
                               MONITOR TABLES


|                                 CLUSTS
|  
|  This table is kept in parallel with CLUHST.  It  contains  the  status
|  word  or  it  contains a connect ID if this entry is associated with a
|  listener.  CLUSTS is a  maximum  of  HSTSIZ  words  long.   HSTSIZ  is
|  defined in STG.
|  
|  Defined in:  CLULSN
|  
|          +-------------------------------------+
|  CLUSTS: |   36 bit status word for each host  |  /|\
|          |                or                   |   |
|          |  Connect ID if entry for listener   |   |
|          +-------------------------------------+ HSTSIZ
|          \                                     \   |
|          \                                     \   |
|          +-------------------------------------+  \|/
|  
|            Name      Bit       Meaning
|  
|            CL%RDY    0         Set when connection is fully opened
|            CL%OPN    1         Set when connection is being opened
|            CL%DNY    2         Set  when  remote  system  is  rejecting
|                                CLUDGR requests
|            CL%LCL    3         Set when remote system has little credit
|                                left
|            CL%NOS    4         Set when remote system is refusing  SEND
|                                ALLs
|                      5-17      Reserved for future expansion
|            CIDBUF    18-35     Contains the count of buffers in use  by
|                                this connection.






















                                     64
                               MONITOR TABLES


                                    CM

   CM is the common header used in all NI command blocks.  The  remainder
   of  a command block for a particular command is appended to the end of
   the common header.

   Defined in:  PHYKNI

                                            Format                                  
          +------------------------------------------------------------------------+ 
   CMFLI  |                              Forward link                              | *
          |------------------------------------------------------------------------| 
   CMBLI  |                             Backward link                              | 
          |------------------------------------------------------------------------| 
   CMVAD  |                        Virtual address of entry                        | 
          |------------------------------------------------------------------------| 
          | |   CMERR   | | | | | | | | |     CMOPC     |       CMTDR       |      |
          | |Error code |     CMFLG     |    Opcode     |    Time domain    |      |
          | | including |               |               |reflectometry value|      |
          | | error bit |               |               |                   |      |
          | | at bottom |               |               |                   |      |
          +------------------------------------------------------------------------+ 

           Field CMSRI     (0-0)   Send/receive indicator

           For field CMFLG(7-14):
                   CMPAC      7    Packing mode for non-BSD
                   CMCRC      8    CRC included
                   CMPAD      9    Unused
                   CMB03      10   Unused
                   CMBSD      11   Buffer segment descriptor format
                   CMB05      12   Unused
                   CMCLR      13   Clear counters
                   CMRSP      14   Response needed

          +------------------------------------------------------------------------+
   CMFLI  |    CMERC                                                               |
          | NISRV error code during command processing                             |
          +------------------------------------------------------------------------+














                                     65
                               MONITOR TABLES


                             CONNECT ID FORMAT

   This is the format of a SCA connect ID.  Each SYSAP  can  specify  the
   SYSAP ID to be of any value.

   Defined in:  SCAPAR

            0      5 6                      22 23         31 32   35
           +--------------------------------------------------------+
           | SID    |     UBITS               | INDEX       |       |
           |SYSAP ID|     Uniqueness bits     |CIDTAB index |unused |
           +--------------------------------------------------------+









































                                     66
                               MONITOR TABLES


                                   CSTnX

   The CSTnX tables, where n ranges from 0 to  3,  are  the  tables  that
   allow  access  to  the  core  status  tables, now residing in extended
   sections.  Each table holds 16 values, which allow indirect access  to
   each of the CSTs, instead of the indexed access that was used when the
   CSTs were in section 0/1.

   The values in the CSTnX tables are never changed  and  are  determined
   when the monitor is linked.  CST5 is still in section 0/1, so there is
   no need for a CST5X table.

   Defined in:  CSTnX

            0      5 6                                   35
           +-----------------------------------------------+
   CSTnX:  |   0    | Address of CSTn                      |
           |-----------------------------------------------|
           |   1    | Address of CSTn                      |
           |-----------------------------------------------|
           |   2    | Address of CSTn                      |
           |-----------------------------------------------|
           |   3    | Address of CSTn                      |
           |-----------------------------------------------|
           |   .    |                                      |
           |   .    |                                      |
           |   .    |                                      |
           |-----------------------------------------------|
           |   17   | Address of CSTn                      |
           +-----------------------------------------------+























                                     67
                               MONITOR TABLES


                                   CST0

   Core Status Table 0 (sometimes referred to as  CST).   Each  entry  in
   this  table  is  principally  defined by the pager.  If the page is in
   use, the entry contains the age stamp for the page; if the page is not
   in use, the age stamp field is used to show the page's state.

   Defined in:  STG

   Index:  Physical page number

                                   Format

           +-------------------------------------------------------+
           |  CSTAGE     | XGAGE  |  CFXRD                    |  | | * / \
   CST0:   | Page State  |        |          Fork #           |  | |    |
           |   or Age    |        |                           |  | |    |
           |-------------------------------------------------------|    |
           |                           .                           |    |
           |                           .                           |
           |                           .                           | MAXCOR
           |                           .                           |  
           |                           .                           |    |
           |                           .                           |    |
           |                           .                           |    |
           |                           .                           |    |
           \                           .                           \   \ /
           +-------------------------------------------------------+

























                                     68
                               MONITOR TABLES
                                CST0 (Cont.)


        Symbol    Bits     Pointer     Content

        AGEMSK    0-8      CSTAGE      If page in use, contents of 
                                        pager age register ( >= 100 )
                                        at last age register reload
                                       If page not in use, this field 
                                        indicates (right-justified) the
                                        page state as follows:
                                       PSRPQ = 0  On replaceable queue
                                       PSDEL = 1  To be put on
                                                   replaceable queue
                                       PSRDN = 2  Read completed
                                       PSWIP = 4  Write in progress
                                       PSRIP = 6  Read in progress
                                       PSSPQ = 7  Page on special memory 
                                                  queue
                                       PSASN = 10 Page assign to process 
                                                   if age field >=PSASN.
                                                   (The age field should 
                                                   always be strictly
                                                   greater than 10 as
                                                   it is initialized to
                                                   100 and increases in
                                                   value as process
                                                   runs.)
                  9-14     XGAGE       Age at last XGC (low bits only)
                  18       CSWRB       CST write bit
                 19-32     CFXRD       Number of fork which initiated
                                       read if page not in use
                                       (that is, age field < 10).
        PSTFLD   33-34     CSTPST      Special page state
                                       PSTAVL=.MCPSA=0  Available for
                                                         RPLQ when freed
                                       PSTSPM=.MCPSS=1  Place on SPMQ
                                                         when freed
                                       PSTOFL=.MCPSO=2  Offline-action
                                                         as PSTSPM
                                       PSTERR=.MCPSE=3  Offline due to
                                                         error action as
                                                         PSTSPM
        CORMB     35                   This is the "modified" bit which 
                                       is set by the pager on any write
                                       reference. This bit is 1 if
                                       the page has been written since
                                       the last operation.







                                     69
                               MONITOR TABLES


                                   CST1

   Core Status Table 1.  This table is referenced only  by  the  software
   and  is  parallel to CST0.  It contains the lock count which indicates
   the number of system events requiring the page be locked in core (that
   is,  page  table contains other core addresses) and the backup address
   (next level of storage) for each page in core (1000000 if unassigned).

   Defined in:  STG

   Index:  Physical page number

                                   Format

            0             11 12 13 14                            35
           +-------------------------------------------------------+
   CST1:   |     PLKMSK     |     |                                | * / \
           |   Lock count   |     |       Backup Address           |    |
           |-------------------------------------------------------|    |
           |                           .                           |    |
           |                           .                           |
           |                           .                           |  MAXCOR
           |                           .                           |
           |                           .                           |    |
           |                           .                           |    |
           |                           .                           |    |
           \                           .                           \   \ /
           +-------------------------------------------------------+

        Symbol    Bits     Pointer     Content

                  0-11     PLKMSK      Lock count field-if non-zero,
                                       the page is not 
                                       considered for swapping
        PLKV       11                  Page lock value in CST1
                 14-35                 Backup address

















                                     70
                               MONITOR TABLES
                                    CST2


                                   CST2

   Core Status Table 2 (Home Map Location).   This  table  is  referenced
   only  by  the  software and is parallel to CST0.  It contains the home
   map location for the page (that is, the page table which contains  the
   core address pointing to the page).

   If the left half is 0, the home map is the  SPT  and  the  right  half
   contains  the SPT index.  If the left half is not 0, the home map is a
   page table or index block, where PTN is the SPT index of that map  and
   PN is the page number within that map.

   (See the SPT and SPTH table descriptions.)

   Defined in:  STG

   Index:  Physical page number

                                   Format
           +-------------------------------------------------------+
   CST2:   |            PTN            |            PN             |  / \
           |-------------------------------------------------------|   |
           |                          or                           |   |
           |-------------------------------------------------------|   |
           |             0             |           SPTN            |   |
           |-------------------------------------------------------|   |
           |                          or                           |   |
           |-------------------------------------------------------|
           |             zero if page not assigned                 | MAXCOR
           |-------------------------------------------------------|  
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+

                                    NOTE

           The SPTN/PTN value  (both  SPT  indexes)  is  used  to
           specify  the  kind  of  page  represented  in the CST2
           table.  For example, if the SPTN in the second  format
           above  is greater than or equal to NOFN (length of the
           OFN area), the process' page is a file page pointed to
           by  a shared pointer or fork overhead page.  Otherwise
           (that  is,  SPTN<NOFN),  it's  an  index  block  page.
           Likewise,  if  the PTN value in the first format above
           is greater than or  equal  to  NOFN,  the  page  is  a


                                     71
                               MONITOR TABLES
                                    CST2


           private  process page (that is, pointed to by a direct
           pointer from the process' map).  Otherwise  (that  is,
           PTN<NOFN), it is a process' file page pointed to by an
           indirect pointer through the file's  own  page  table,
           the index block.  *

           * In both of  these  cases  when  an  index  block  is
           involved  (that  is,  SPTN/PTN< NOFN), it is common to
           find in the monitor listings  the  symbolic  notation,
           OFN, replacing SPTN/PTN.










































                                     72
                               MONITOR TABLES


                                   CST3

   Core Status Table 3.  This table is referenced only  by  the  software
   and is parallel to CST0.  An entry in this table is used for a variety
   of purposes, generally as a  list  pointer  for  groups  of  pages  on
   various queues.

   For example, when on the replaceable queue, the left  half  and  right
   half  contain  backward and forward list pointers, respectively.  When
   on a swapping device queue, the right half  contains  a  forward  list
   pointer and B0 is 1 if write and 0 if read.

   Other queues threaded throughout  this  table  are  the  deletion  and
   special memory queues.

   When the page is in use (not linked on one of the queues), it contains
   the local disk address for PHYSIO and the fork   assigned to the page.

   Defined in:  STG

   Index:  Physical page number

                                   Format

           +-------------------------------------------------------+
   CST3:   |   Backward List Pointer   |   Forward List Pointer    |   / \
           |-------------------------------------------------------|    |
           |                          or                           |    |
           |-------------------------------------------------------|    |
           | |                         |   Forward List Pointer    |    |
           |-------------------------------------------------------|    |
           |                          or                           |    |
           |-------------------------------------------------------|    |
           |      |  CSTOFK      |  CSTLDA                         |*   |
           |Flags |    Fork #    |       Local Disk Address        |
           |-------------------------------------------------------| MAXCOR
           |                           .                           |  
           |                           .                           |    |
           |                           .                           |    |
           |                           .                           |    |
           |                           .                           |    |
           |                           .                           |    |
           |                           .                           |    |
           \                           .                           \   \ /
           +-------------------------------------------------------+








                                     73
                               MONITOR TABLES
                                CST3 (Cont.)


            0 1 2 3              14 15                           35
           +-------------------------------------------------------+
           | | | |  CSTOFK         |  CSTLDA                       |
           | | | |     Fork #      |       Local Disk Address      |
           +-------------------------------------------------------+

        Symbol    Bits     Pointer     Content

        DWRBIT     0                   Set if write in progress.
                                       The bit is cleared by the
                                       swapper when the write
                                       completes.

        SWPERR     1                   Set if an unrecoverable
                                       error occurred when this
                                       page read in from disk/drum

        DSKSWB     2                   Swap to disk requested by 
                                       DDMP (periodic routine that
                                       trickles file pages to the
                                       disk) or by monitor when
                                       certain monitor calls are
                                       issued, for example, CLOSF

                   3-14    CSTOFK      Process to which this page
                                       is assigned (7777 is not
                                       assigned).

                  15-35    CSTLDA      Local disk address for
                                       PHYSIO






















                                     74
                               MONITOR TABLES


                                   CST5

   Core Status Table 5.  This table is referenced only  by  the  software
   and  is parallel to CST0.  It is a table of short IORBs.  See the IORB
   table for a description of the IRBSTS entry which describes the  short
   (1 word) IORB.

   Defined in:  STG

   Index:  Physical page number

                                   Format

           +-------------------------------------------------------+
   CST5:   |           Flags           | Next Disk IORB(short/long)|  / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | MAXCOR
           |                           .                           | 
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+




















                                     75
                               MONITOR TABLES


                                    CT

   The CT structure is used to keep the information for a DECnet  network
   management  counter.   It is pointed to by a table, generated with the
   COUNTER macro.  This structure  is  read  by  the  routine  NTCTRS  in
   D36COM.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | |                                CTHDR                                 |
          | |                        Counter width, number                         |
          |------------------------------------------------------------------------| 
   CTRED  |               Instruction to execute to read the counter               | 
          |------------------------------------------------------------------------| 
   CTCLR  |              Instruction to execute to clear the counter               | 
          |------------------------------------------------------------------------| 
   CTBMC  |               Instruction to execute to get the bit map                | 
          +------------------------------------------------------------------------+ 

           Field CTBMF     (0-0)   Bit map flag






























                                     76
                               MONITOR TABLES


                                  DEV`DTB

   Device Dispatch Table.  Each device has its own  dispatch  table  that
   conforms  to  the  format  described  below.  An error return dispatch
   address is placed in those words which have  no  corresponding  device
   function.   The  naming convention for these tables is the device name
   concatenated with DTB (that is, MTADTB, DSKDTB, and TTYDTB)

   Defined in:  PROLOG

                                   Format

            +-------------------------------------------------------+
   DTBLH=0  |                  Length of DTB Block                  |
            |-------------------------------------------------------|
   DLUKD=1  |                    Directory Setup                    |
            |-------------------------------------------------------|
   NLUKD=2  |                      Name Lookup                      |
            |-------------------------------------------------------|
   ELUKD=3  |                   Extension Lookup                    |
            |-------------------------------------------------------|
   VLUKD=4  |                    Version Lookup                     |
            |-------------------------------------------------------|
   PLUKD=5  |                 Protection Insertion                  |
            |-------------------------------------------------------|
   ALUKD=6  |                   Account Insertion                   |
            |-------------------------------------------------------|
   SLUKD=7  |                 Status Modification                   |
            |-------------------------------------------------------|
   OPEND=10 |                       Open File                       |
            |-------------------------------------------------------|
   BIND=11  |                 Sequential Byte Input                 |
            |-------------------------------------------------------|
   BOUTD=12 |                Sequential Byte Output                 |
            |-------------------------------------------------------|
   CLOSD=13 |                      Close File                       |
            |-------------------------------------------------------|
   REND=14  |                    Rename File                        |
            |-------------------------------------------------------|
   DELD=15  |                      Delete File                      |
            |-------------------------------------------------------|
   DMPID=16 |                    Dump Mode Input                    |
            |-------------------------------------------------------|
   DMPOD=17 |                   Dump Mode Output                    |
            |-------------------------------------------------------|
   MNTD=20  |                         Mount                         |
            |-------------------------------------------------------|
   DSMD=21  |                       Dismount                        |
            |-------------------------------------------------------|
   INDD=22  |                Initialize a Directory                 |



                                     77
                               MONITOR TABLES
                              DEV`DTB (Cont.)


            |-------------------------------------------------------|
   MTPD=23  |                   MTOPR Operations                    |
            |-------------------------------------------------------|
   GDSTD=24 |                   Get Device Status                   |
            |-------------------------------------------------------|
   SDSTD=25 |                   Set Device Status                   |
            |-------------------------------------------------------|
   RECOUT=26|               Force Record Out (SOUTR)                |
            |-------------------------------------------------------|
   RFTADD=27|                Read File Time and Date                |
            |-------------------------------------------------------|
   SFTADD=30|                Set File Time and Date                 |
            |-------------------------------------------------------|
   JFNID=31 |                 Set JFN for Input                     |
            |-------------------------------------------------------|
   JFNOD=32 |                Set JFN for Output                     |
            |-------------------------------------------------------|
   ATRD=33  |                  Check Attribute                      |
            |-------------------------------------------------------|
   RLJFD=34 |                    Release JFN                        |
            +-------------------------------------------------------+































                                     78
                               MONITOR TABLES


                                  DEVCH1

   Device Characteristics  Table  1.   This  table  contains  a  word  of
   information  about  each  device unit in the system and is initialized
   from the INIDVT table at system start up time.

   Defined in:  STG, MONSYM

                                   Format

           +-------------------------------------------------------+
   DEVCH1: |            Device Characteristics (word 2)            | / \
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |
           |                           .                           | NDEV
           |                           .                           |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \ \ /
           +-------------------------------------------------------+ 

                  Symbol   Bits        Content

                  D1%SPL    0          Device is spooled
                  D1%ALC    1          Device is under control
                                        of allocator
                  D1%VVL    2          Volume valid
                  D1%NIU    3          Device slot not is use
                  D1%INI    4          Device is being initialized
                                        currently for structures
                                        only)
                  D1%MTO    5          Device can do MTOPR without
                                       JFN opened.











                                     79
                               MONITOR TABLES


                                  DEVCH2

   Device Characteristcs Table 2.  This table  contains  spool  directory
   information and is parallel to the DEVCH1 table.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   DEVCH2: |          Directory Number of Spool Directory          | / \
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |
           |                           .                           | NDEV
           |                           .                           |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \ \ /
           +-------------------------------------------------------+
























                                     80
                               MONITOR TABLES


                                  DEVCHR

   Device Characteristics Table.  This table contains indexed information
   about  each  device  unit  and is initialized from the INIDVT table at
   system startup time.  See INIDVT table for bit definitions.

   Defined in:  STG

                                   Format

            0          8  9          17 18                       35
           +-------------------------------------------------------+
   DEVCHR: |   CHAR1*   |    TYPE      |           MODES           |  / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NDEV
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+

        *CHAR1
            Bit 5 can take on another meaning (that is, DV%OPN=1B5;
            File Open on Device) than the one described in INIDVT.

                                    NOTE

           A resident word, DEVLCK (Free is -1), is used to  lock
           the data base in the DEVXXX Tables when they are being
           manipulated.












                                     81
                               MONITOR TABLES


                                  DEVDSP

   Device Dispatch Table  Addresses.   This  table  contains  the  device
   dispatch table for each device unit and is initialized from the INIDVT
   table at system startup time.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   DEVDSP: |  Device Type Index        |  Dispatch Table Address   |  / \
           |   (Not Referenced)        |                           |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NDEV
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+






















                                     82
                               MONITOR TABLES


                                  DEVNAM

   Device Name Table.  This table contains the  SIXBIT  device  name  for
   each  device  unit.   The generic device name is obtained from INIDVT,
   modified to include unit number (if device has units)  and  stored  in
   this table at system start up time.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   DEVNAM: |                    SIXBIT / Name /                    |  / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NDEV
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+






















                                     83
                               MONITOR TABLES


                                  DEVUNT

   Device Unit Table.  This table  contains  information  about  the  job
   associated  with a unit, where the unit information in DEVUNT is built
   at system startup utilizing data from the INIDVT table.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   DEVUNT: |Assigner's Job#/Dev Free(-1)|Unit # or No Unit Dev(-1) | / \
           |                            | or being controlled by   |  |
           |                            | the allocator (-2)       |  |
           |-------------------------------------------------------|  |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |
           |                            .                          | NDEV
           |                            .                          |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |  |
           |                            .                          |  |
           \                            .                          \ \ /
           +-------------------------------------------------------+





















                                     84
                               MONITOR TABLES


                                 DIRECTORY

   Directory Format.  The following illustrations show the  format  of  a
   TOPS-20 directory.

   Defined:  PROLOG

                          Overview of a Directory

           +-------------------------------------------------------+
           |                                                       |
           |                        Page 0                         |
           |                                                       |
           |-------------------------------------------------------|
           |                                                       |
           |                        Page 1                         |
           |                                                       |
           |-------------------------------------------------------|
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |-------------------------------------------------------|
           |                                                       |
           |                        Page n                         |
           |                                                       |
           |-------------------------------------------------------|
           |                                                       |
           |                                                       |
           |                     Symbol Table                      |
           |                                                       |
           |                                                       |
           |-------------------------------------------------------|
           |                                                       |
           |                                                       |
           |           Reserved for Directory Expansion            |
           |                                                       |
           |                                                       |
           +-------------------------------------------------------+









                                     85
                               MONITOR TABLES
                             DIRECTORY (Cont.)


                         First Page of a Directory


            0     17 18    23 24
           +-------------------------------------------------------+
           |  DRTYP                    | DRVER  |  DRHLN           |
           | Block Type TYDIR (400300) | Ver. # | Length of Header |
           |-------------------------------------------------------|
           |  DRRPN                    |  DRNUM                    |
           |  Relative Page # in DIR   |     Directory Number      |
           |-------------------------------------------------------|
           |  DRFFB                                                |
   .DRFFB=2|              Pointer to First Free Block              |
           |-------------------------------------------------------|
           |  DRSBT                                                |
           |           Address of start of Symbol Table            |
           |-------------------------------------------------------|
           |  DRSTP                                                |
           |            Address of end of Symbol Table             |
           |-------------------------------------------------------|
           |  DRFTP                                                |
           |   Address of Last Used Word+1 for Strings and FDBs    |
           |-------------------------------------------------------|
           |  DRFBT                                                |
           |               Pointer to Free Bit Table               |
           |-------------------------------------------------------|
           |  DRDPW                                                |
           |                Default File Protection                |
           |-------------------------------------------------------|
           |  DRPRT                                                |*
           |             Default Directory Protection              |
           |-------------------------------------------------------|
           |  DRDBK                                                |
           |                 Backup Specification                  |
           |-------------------------------------------------------|
           |  DRLIQ                                                |
           |                    Logged In Quota                    |
           |-------------------------------------------------------|
           |  DRLOQ                                                |
           |                   Logged Out Quota                    |
           |-------------------------------------------------------|
           |  DRDCA                                                |
           |             Current Directory Allocation              |
           |-------------------------------------------------------|
           |  DRNAM                                                |
           |           Pointer to Directory Name String            |
           |-------------------------------------------------------|
           |  DRPSW                                                |
           |              Pointer to Password String               |



                                     86
                               MONITOR TABLES
                             DIRECTORY (Cont.)


           |-------------------------------------------------------|
           |  DRPRV                                                |
           |                    Privilege Bits                     |
           |-------------------------------------------------------|
           |  DRMOD                                                |
           |                       Mode Bits                       |
           |-------------------------------------------------------|
           |  DRDAT                                                |
|          |          Date and Time of Last Interactive LOGIN      |
           |-------------------------------------------------------|
           |  DRUGP                                                |
           |              Pointer to User Group List               |
           |-------------------------------------------------------|
           |  DRDGP                                                |
           |            Pointer to Directory Group List            |
           |-------------------------------------------------------|
           |  DRUDT                                                |
           |       Date and Time of Last Update to Directory       |
           |-------------------------------------------------------|
           |  DRSDM                   |  DRSDC                     |
           |  Max # of Subdirectories |  Count of Subdirectories   |
           |-------------------------------------------------------|
           |  DRCUG                                                |
           |      CRDIR allowed specifying these User Groups       |
           |-------------------------------------------------------|
           |  DRACT                                                |
           |            Pointer to Dir. Default Account            |
           |-------------------------------------------------------|
           |  DRDNE                                                |
           |         Default online expiration date/interval       |
           |-------------------------------------------------------|
           |  DRDFE                                                |
           |        Default offline expiration date/interval       |
           |-------------------------------------------------------|
|          |  DRRNA                                                |
|          |            Pointer to remote alias list               |
|          |-------------------------------------------------------|
|          |                          |  DRPEV                     |
|          |         Reserved         |  Password encryption ver.  |
           |-------------------------------------------------------|
           |  DRPDT                                                |
           |           Creation date/time of password              |
           |-------------------------------------------------------|
           |  DRPED                                                |
           |          Expiration date/time of password             |
           |-------------------------------------------------------|
           |  DRPUD                                                | *
           |                Password use data                      |




                                     87
                               MONITOR TABLES
                             DIRECTORY (Cont.)


           |-------------------------------------------------------|
           |  DRPPN                                                |
           |         TOPS-10 project-programmer number             |
|          |-------------------------------------------------------|
|          |  DRNIL                                                |
|          |         Last non-interactive LOGIN date-time          |
|          |-------------------------------------------------------|
|          |  DRFIL                    |  DRFNL                    |
|          |      Failed interactive   |    Failed non-interactive |
|          |        Login attempts     |      Login attempts       |
|          |-------------------------------------------------------|
           |                                                       |
           |                    Spare Words                        |
           |                                                       |
           |                                                       |
           \                                                       \
           |-------------------------------------------------------|
           |                                                       |
           |            Free Space for Strings and FDBs            |
           |                                                       |
           \                                                       \
           +-------------------------------------------------------+


                                         18      23 24     29 30     35
           +-----------------------------------------------------------+
    DRPRT  |                            |   DRPOW  |  DRPGP  |  DRPWL  | 
           +-----------------------------------------------------------+

                  Bits     Pointer     Content

                 18-23     DRPOW       Owner field
                 24-29     DRPGP       Group field
                 30-35     DRPWL       World field


           +-----------------------------------------------------------+
    DRPUD  |            DRPCU             |          DRPMU             |
           +-----------------------------------------------------------+

                  0-17     DRPCU       Current password use count
                 18-36     DRPMU       Maximum password use count










                                     88
                               MONITOR TABLES
                             DIRECTORY (Cont.)


                       General format for all blocks


            0                        17 18       23 24              35
           +----------------------------------------------------------+
           | BLKTYP                    | BLKVER    | BLKLEN           |
           |    Type code              |   Ver. #  |   Length         |
           +----------------------------------------------------------+

                  Possible type codes are:

                        Code      Value      Type

                       .TYNAM     400001     Name Block
                       .TYEXT     400002     Extension Block
                       .TYACT     400003     Account Block
                       .TYUNS     400004     User Name Block
                       .TYFDB     400100     File Descriptor Block
                       .TYLAC     400200     Legal Account List
                       .TYDIR     400300     Directory
                       .TYSYM     400400     Symbol Table
                       .TYFRE     400500     Free Block
                       .TYFBT     400600     Free Storage Bittable
                       .TYGDB     400700     Group Descriptor Block


                         Subsequent Directory Pages

           +-------------------------------------------------------+
           |  DRTYP                    | DRVER  |  DRHLN           |
           |    .TYDIR (400300)        | Ver. # | Length of Header |
           |-------------------------------------------------------|
           |  DRRPN                    | DRNUM                     |
           |  Relative Page # in DIR   |     Directory Number      |
           |-------------------------------------------------------|
           |  DRFFB                                                |
           |              Pointer to First Free Block              |
           |-------------------------------------------------------|
           |                                                       |
           |                                                       |
           |            Free Space for Strings and FDBs            |
           |                                                       |
           |                                                       |
           +-------------------------------------------------------+








                                     89
                               MONITOR TABLES
                             DIRECTORY (Cont.)


                                Symbol Table

           |-------------------------------------------------------|
           |  SYMTY                    |        |  SYMDN           |
           | .TYSYM (400400)           |        |Dir. # of Sym.Tbl.|
           |-------------------------------------------------------|
           |                          -1                           |
           |-------------------------------------------------------|
           |SYMET|  SYMAD                                          | * \
           |Type |                 Address of FDB                  |    \
           |-------------------------------------------------------|     >
           |  SYMVL                                                |    /
           |         First 5 Characters of Name, Account or User   |   /
           |         Name for last writer/author in ASCII          |
           |-------------------------------------------------------|
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |-------------------------------------------------------|   \
           |                                                       |    \
           |-------------------------------------------------------|     >
           |                                                       |    /
           +-------------------------------------------------------+   /


            0 1 2 3                                              35
           +-------------------------------------------------------+
           |Type |                 Address of FDB                  |
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                  0-2      SYMET       Entry Type
                                            0 = .ETNAM     Name
                                            2 = .ETUNS     User Name
                                            4 = .ETACT     Account
                  3-35     SYMAD       Address of FDB









                                     90
                               MONITOR TABLES
                             DIRECTORY (Cont.)


           User Name String

           +-------------------------------------------------------+
           | UNTYP                    |        |  UNLEN            |
           |    .TYUNS (400004)       | Ver. # |  Length           |
           |-------------------------------------------------------|
           | UNSHR                    |                            |
           |            Share Count of User Name String            |
           |-------------------------------------------------------|
           | UNVAL                                                 |
           |                 ASCIZ User Name String                |
           +-------------------------------------------------------+


           Name String

           +-------------------------------------------------------+
           | NMTYP                     |       | NMLEN             |
           |    .TYNAM (400001)        | Ver. #| Length            |
           |-------------------------------------------------------|
           | NMVAL                                                 |
           |                   ASCIZ Name String                   |
           |                                                       |
           +-------------------------------------------------------+


           Extension String

           +-------------------------------------------------------+
           | EXTYPE                    |        |EXLEN             |
           |    .TYEXT (400002)        | Ver.#  |Length            |
           |-------------------------------------------------------|
           |                                                       |
           |                ASCIZ Extension String                 |
           |                                                       |
           +-------------------------------------------------------+


           Account String

           +-------------------------------------------------------+
           | ACTYP                     |        |ALLEN             |
           |    .TYACT (400003)        | Ver. # | Length           |
           |-------------------------------------------------------|
           | ACSHR                                                 |
           |                      Share Count                      |
           |-------------------------------------------------------|
           | ACVAL                                                 |
           |                 ASCIZ Account String                  |
           |                                                       |
           +-------------------------------------------------------+

                                     91
                               MONITOR TABLES
                             DIRECTORY (Cont.)


           File Descriptor Block (FDB)

           +-------------------------------------------------------+
           | FBTYP                     | FBVER  | FBLEN            |
           |    .TYFDB (400100)        | Ver. # |       Length     |
           |-------------------------------------------------------|
           |                                                       |
           |                                                       |
           \       See FDB Table for Details of this Block         \
           \                                                       \
           |                                                       |
           |                                                       |
           +-------------------------------------------------------+


           Free Space

           +-------------------------------------------------------+
           | FRTYP                     | FRVER  | FRLEN            |
           |    .TYFRE (400500)        | Ver. # |      Length      |
           |-------------------------------------------------------|
           | FRNFB                                                 |
           |     Pointer to Next Free Block or 0 if at end         |
           |-------------------------------------------------------|
           |                                                       |
           |                                                       |
           \                Remainder of Free Block                \
           \                                                       \
           |                                                       |
           |                                                       |
           +-------------------------------------------------------+


           Free Storage Bit Table

           +-------------------------------------------------------+
           |                           |       |                   |
           |    .TYFBT (400600)        | Ver. #|  Length           |
           |-------------------------------------------------------|
           |                                                       |
           \     Bit Table Containing 1 Bit per Directory Page     \
           \                                                       \
           |                0 = No Room on the Page                |
           |             1 = There is Room on the Page             |
           +-------------------------------------------------------+







                                     92
                               MONITOR TABLES
                             DIRECTORY (Cont.)


           Group List

           +-------------------------------------------------------+
           |                           |        |                  |
           |    .TYGDB (400700)        | Ver. # | Length           |
           |-------------------------------------------------------|
           |         Group #           |          Group #          |
           |-------------------------------------------------------|
           |          Group #          |             0             |
           +-------------------------------------------------------+










































                                     93
                               MONITOR TABLES


                              DIRECTORY CACHE

   This resident table contains the directory cache and a  lock  for  the
   cache.  Every five words (excluding the lock) describes an entry.

   Defined in:  STG, PROLOG

   Reference by:  DIRECT

                                   Format

            +-------------------------------------------------------+
   DIRCLK:  |                 Directory cache lock                  |
            |-------------------------------------------------------|
   DIRCSH:  |                                                       |     / \
   DCDIRN=0 |            Directory number of this entry             |---   |
            |-------------------------------------------------------|  |   |
   DCSTRN=1 |   Structure information   |     Structure number      |  |   |
            | (l.half of SDBFLK in SDB) |                           |  |   |
            |-------------------------------------------------------|      |
   DCSHRC=2 |               Share count of the entry                |normal|
            |-------------------------------------------------------|entry |
   DCSOFN=3 |                 OFN for this directory                |      |
            |-------------------------------------------------------|  |   |
   DCSTIM=4 |     Time at which this entry was last referenced      |  |   |
            |-------------------------------------------------------|---
            |                           .                           |  DIRSCZ
            |                           .                           |  (^D25)
            |                           .                           |    *5
            \                                                       \
            +-------------------------------------------------------+     \ /






















                                     94
                               MONITOR TABLES


                                    DL

   This is the DECnet data link block -- DL.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   DLNXT  |                      Link to next data link block                      |        
          |------------------------------------------------------------------------| 
   DLUID  |                       ID supplied by DNADLL user                       |        
          |------------------------------------------------------------------------| 
   DLDID  |                               Device ID                                |        
          |------------------------------------------------------------------------| 
          | | | |     |                       |               DLKNO                | *
          |   DLFLG   |                       |   Kontroller number (DTE only)     |
          |------------------------------------------------------------------------| 
   DLUNB  |                      Pointer to the User-NI block                      |        
          |------------------------------------------------------------------------| 
   DLPID  |                               Portal ID                                |        
          |------------------------------------------------------------------------| 
   DLLTP  |                           Line table pointer                           |        
          |------------------------------------------------------------------------| 
   DLSLZ  |                     (0) Seconds since last zeroed                      |        
          |------------------------------------------------------------------------| 
   DLBYR  |                      (1000) Total bytes received                       |        
          |------------------------------------------------------------------------| 
   DLBYS  |                        (1001) Total bytes sent                         |        
          |------------------------------------------------------------------------| 
   DLDBR  |                   (1010) Total data blocks received                    |        
          |------------------------------------------------------------------------| 
   DLDBS  |                     (1011) Total data blocks sent                      |        
          |------------------------------------------------------------------------| 
   DLUBU  |                     (1065) User buffer unavailable                     |        
          +------------------------------------------------------------------------+ 

           For field DLFLG(0-5):
                   DLRUN      0    Data link is running
                   DLEBU      1    Emergency buffer in use
                   DLLIU      2    Line in use by circuit












                                     95
                               MONITOR TABLES


                    DNA PARAMETER AND COUNTER DATA BASE

   This is the DNA parameters and counters data  base  description.   The
   entity data bases are pointed to by table PRMP.

   Defined in:     NTMAN

   Each entity type (NODE, LINE) has a data base  composed  of  two  word
   blocks associated with it.  The two word blocks have the format:

            0     3 4     8 9    14 15   20 21              35
           +--------------------------------------------------+
   Word 0  | NTTYP | NTLEN | NTROU | NTDEV |       NTQUA      |
           +--------------------------------------------------+

             Bits   Pointer   Content

             0-3    NTTYP     Data type
                                NT.FC=1   - Coded format
                                NT.FCM=2  - Coded multiple
                                NT.FAI=3  - Ascii image (8-bit)
                                NT.FDU=4  - Decimal, unsigned. Cannot be zero
                                NT.FDS=5  - Decimal, signed
                                NT.FH=6   - Hex integer
                                NT.FHI=7  - Hex, image
                                NT.FOC=10 - Octal
                                NT.FDM=11 - Decimal, milliseconds
                                NT.FVN=12 - Version number
                                NT.FNE=13 - Node entity ID
                                NT.FNN=14 - Ascii node name
                                NT.FCN=15 - Ascii circuit name
             4-8    NTLEN     Length
             9-14   NTROU     Index to routine to call
            15-20   NTDEV     Device applicability
                                NTD.R - DMR-11
|                               NTD.N - Ethernet (NIA20)
|                               NTD.C - Computer Interconnect (CI20)
|                               NTD.P - DDP (DUP11)
|                               NTD.K - KDP (KMC11/DUP11)
                                NTD.D - DTE-20 (UGH)
            21-35   NTQUA     Qualifier Parameter Number












                                     96
                               MONITOR TABLES
                DNA PARAMETER AND COUNTER DATA BASE (Cont.)


            0     3 4     9 10   11 12      13    22 23     35
           +--------------------------------------------------+
   Word 1  | NTAPL | NTINF | NTSET | NTBUF | NTBSZ  | NTSEQ   |
           +--------------------------------------------------+

             Bits   Pointer   Contents

             0-3    NTAPL     Applicability restrictions
                                NTA.E - Executor
                                NTA.L - Loop nodes
                                NTA.R - Remote nodes
                                NTA.H - Home area nodes 
             4-9    NTINF     Information type
                                NTI.C - Characteristics
                                NTI.S - Status
                                NTI.% - Summary
                                NTI.K - Circuit State
                                NTI.Q - This parameter is qualified
                                NTI.N - None. NOOP bit
            10-11   NTSET     Settability restrictions
                                NTS.=0  - Read and write
                                NTS.R=1 - Read only parameter
                                NTS.W=2 - Write only parameter
             12     NTBUF     Buffer Field
                                NTB.=0 -  Parameter value fits into a word
                                NTB.B=1 - Parameter value too big
            13-22   NTBSZ     Buffer size needed (if needed)
            23-35   SEQ       Sequence or type of field
























                                     97
                               MONITOR TABLES


                                  DRMBBT

   Drum Bit Table.  This bit table indicates which pages are in  use  and
   which pages are available in the swapping area.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+           / \
   DRMBBT: \                                                       \  \         |
           \                                                       \Cylinder 0  |
           |                                                       |  /         |
           |-------------------------------------------------------|            |
           \                                                       \  \         |
           \                                                       \Cylinder 1  |
           |                                                       |  /         |
           |-------------------------------------------------------|            |
           |                           .                           |            |
           |                           .                           |         
           |                           .                           |          DRMMXB
           |                           .                           |            *
           |                           .                           |          DRMBSZ
           |                           .                           |
           |                           .                           |            |
           |                           .                           |            |
           |                           .                           |            |
           |                           .                           |            |
           |                           .                           |            |
           |                           .                           |            |
           |-------------------------------------------------------|            |
           \                                                       \  \         |
           \                                                       \Cylinder n  |
           |                                                       |  /         |
           +-------------------------------------------------------+           \ /


                                    NOTE

           The bit  map  for  each  cylinder  starts  on  a  word
           boundary and contains as many full words as are needed
           for all of its pages.











                                     98
                               MONITOR TABLES


                                  DRMCNT

   Drum Count Table.  This resident table, indexed by  cylinder,  records
   the  free  page count for the drum (logical swapping area).  The total
   free page count for all the cylinders is kept  in  the  storage  word,
   DRMFRE.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   DRMCNT: |           Drum Free Page Count - Cylinder 0           |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |
           |                           .                           |DRMMXB 
           |                           .                           |
           |                           .                           |  |
           \                           .                           \  |
           |-------------------------------------------------------|  |
           |           Drum Free Page Count - Cylinder n           |  |
           +-------------------------------------------------------+ \ /





























                                     99
                               MONITOR TABLES


                                  DSKSIZ

   Disk Size Pointer Table.  This table contains  pointers  to  the  disk
   size  data  tables.  DSKSIZ is parallel to DSKUTP which contains codes
   for the known disk types.   When  an  entry  is  added  to  DSKUPT,  a
   corresponding  entry  must  be added to DSKSIZ to point to the correct
   size data for that type of disk.

   Defined in:  PHYSIO

                                   Format

           +-------------------------------------------------------+
   DSKSIZ: |             Pointer to RP04 Table (DSKSZ0)            |
           |-------------------------------------------------------|
           |             Pointer to RP05 Table (DSKSZ0)            |
           |-------------------------------------------------------|
           |             Pointer to RP06 Table (DSKSZ1)            |
           |-------------------------------------------------------|
           |             Pointer to RP07 Table (DSKSZ2)            |
           |-------------------------------------------------------|
           |             Pointer to RM03 Table (DSKSZ3)            |
           |-------------------------------------------------------|
           |             Pointer to RP20 Table (DSKSZ4)            |
           |-------------------------------------------------------|
           |             Pointer to RA80 Table (DSKSZ5)            |
           |-------------------------------------------------------|
           |             Pointer to RA81 Table (DSKSZ6)            |
           |-------------------------------------------------------|
           |             Pointer to RA60 Table (DSKSZ7)            |
           |-------------------------------------------------------|
           |             Pointer to RA82 Table (DSKSZ8)(Future)    |
           |-------------------------------------------------------|
           |             Pointer to RA62 Table (DSKSZ9)(Future)    |
           +-------------------------------------------------------+


















                                    100
                               MONITOR TABLES


                                  DSKSZ`N

   Disk Size Table (for type n).  The resident table contains  size  data
   (for disks) based on type.

           n = 0   for RP04 and RP05
           n = 1   for RP06
           n = 2   for RP07
           n = 3   for RM03
           n = 4   for RP20
           n = 5   for RA80
           n = 6   for RA81
           n = 7   for RA60
           n = 8   for RA82 (future)
           n = 9   for RA62 (future)

   Defined in:  STG

                                   Format

   DSKSZ`n:  +-------------------------------------------------+
   SEGPAG=0  |                Sectors per Page                 |
             |-------------------------------------------------|
   SECCYL=1  |              Sectors per Cylinder               | 
             |-------------------------------------------------|
   PAGCYL=2  |               Pages per Cylinder                | 
             |-------------------------------------------------|
   CYLUNT=3  |               Cylinders per Unit                |
             |-------------------------------------------------|
   SECUNT=4  |                Sectors per Unit                 |
             |-------------------------------------------------|
   BTWCYL=5  |   No. of Bit Words in Bit Table per Cylinder    |
             |-------------------------------------------------|
   LPPCYL=6  |            Lost Sectors per Surface             |
             |-------------------------------------------------|
   MINFPG=7  |  Minimum Free Pages for Free Choice Allocation  |
             |-------------------------------------------------|
   MAXFPU=10 |    Pages per Unit for DSKASN turning point      |
             |-------------------------------------------------|
   SECSRF=11 |               Sectors per Surface               |
             |-------------------------------------------------|
   USSECU=12 |       Microseconds per LATOPT sector unit       |
             |-------------------------------------------------|
|  TRECPP=13 |     True Section per Page (RAxx disks only)     |
|            +-------------------------------------------------+








                                    101
                               MONITOR TABLES


                                  DSKUTP

   Disk Unit Type.  This table contains the unit types used by  the  file
   system.

   Defined in:  PHYSIO

                                   Format

           +-------------------------------------------------------+ / \
   DSKUTP: |           RP04 Disk Unit Code (.UTRP4 = 1)            |  |
           |-------------------------------------------------------|  |
           |           RP05 Disk Unit Code (.UTRP5 = 5)            |  |
           |-------------------------------------------------------|  |
           |           RP06 Disk Unit Code (.UTRP6 = 6)            |  |
           |-------------------------------------------------------|  |
           |           RP07 Disk Unit Code (.UTRP7 = 7)            |  |
           |-------------------------------------------------------|  |
           |           RM03 Disk Unit Code (.UTRM3 = 11)           |  |
           |-------------------------------------------------------|  |
           |           RP20 Disk Unit Code (.UTP20 = 24)           |  
           |-------------------------------------------------------| NDSKUT
           |           RA80 Disk Unit Code (.UTR80 = 27)           |  |
           |-------------------------------------------------------|  |
           |           RA81 Disk Unit Code (.UTR81 = 30)           |  |
           |-------------------------------------------------------|  |
           |           RA60 Disk Unit Code (.UTR60 = 31)           |  |
           |-------------------------------------------------------|  |
           |           RA82 Disk Unit Code (.UTR82 = 32)(Future)   |  |
           |-------------------------------------------------------|  |
           |           RA62 Disk Unit Code (.UTR62 = 33)(Future)   |  |
           +-------------------------------------------------------+ \ /





















                                    102
                               MONITOR TABLES


                                    DST

   Drum Status Table.  This table is indexed as a function  of  the  drum
   (swapping space) address.  The DST holds the address of the next lower
   level of storage (usually disk) for the page stored at that address on
   the drum.

   BWRBIT (bit 11) indicates if the page has  been  changed  since  being
   read from the lower level storage.  The page is only copied back on to
   the lower level storage if BWRBIT is set (that is, page modified) when
   the page is no longer in use.  A slot no longer in use contains a -1.

   The DST table is in an extended section and is pointed to by DSTLOC.

   Defined in:  STG, PROLOG

   Index:  Drum page number

                                   Format

                            11   14                              35
           +-------------------------------------------------------+  / \
   DST:    |                ||  |         Storage Address          |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NDST
           |                           .                           | 
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /



















                                    103
                               MONITOR TABLES


                             DTE-STORAGE-AREA

   DTE Storage Area.  This storage area contains storage  for  each  DTE.
   It  contains  the Communication Area for each processor in COMBAS, the
   linked output packet queues (pointed  to  by  DTEQS),  the  DTE  input
   buffers,  and  local  storage  (that  is,  ACs, PC, & PDL) for the DTE
   Protocol Handler, DTESRV.

   A packet in the COMQ area must be reformatted to RSX20F  protocol  and
   stored in PKTADR before being sent over the DTE.  The before and after
   packet formats are described below.

   Two single packets, SNGPK1 and SNGPK2  (already  formatted  as  direct
   packets to RSX20F protocol  -  See below) are set aside for the DTSNGL
   routine.  This routine is responsible for activating lines and sending
   single  characters  over  the  DTE  if  the output buffer has only one
   character.

   Normally output buffer characters are sent by way of indirect  packets
   over  the  DTE, where the indirect packet (after being reformatted and
   stored in PKTADR) is sent first followed by the line's  output  buffer
   characters.

   Defined in:  STG

                                   Format
           +-------------------------------------------------------+
   UPFLAG: |          Word to Generate Continued Message           |
           |-------------------------------------------------------|
   LOAD11: |              Says if -11 Needs to Reload              |
           |-------------------------------------------------------|
   LODFRK: |        Handle of Monitor Fork Doing -11 Reboot        |
           |-------------------------------------------------------|
   DTEDTE: |                 The Interrupting DTE                  |
           |-------------------------------------------------------|
   CTYUNT: |              FE Physical Unit for TS TTY              |
           |-------------------------------------------------------| / \
   DTEQS:  |             Drive Queue Header for DTE 1              |  |
           |          (Ptr. to 1st Queued Packet in COMQ)          |  
           \                           .                           \ DTEN
           |                           .                           |  
           |             Driver Queue Header for DTE n             |  |
           |-------------------------------------------------------| \ /
   COMQ:   |                                                       |*/ \
           |                                                       |  |
           |                Area for Queue Packets                 |  |
           |                 (=Packet Size * ^D20)                 |
           \                                                       \ QPKT1
           |                                                       |  
           |                                                       |  |
           |                                                       | 


                                    104
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


           |-------------------------------------------------------| \ /
   COMH:   |   Queue Header (Points to 1st Free Packet in COMQ)    |
           |-------------------------------------------------------| / \
   DTESTS: |                   DTE 1 Status Word                   |* |
           |                           .                           |
           \                           .                           \ DTEN
           |                   DTE n Status Word                   |  |
           |-------------------------------------------------------| \ /
   DTEST1: |              DTE 1 Secondary Status Word              |*/ \
           |                           .                           |  |
           \                           .                           \ DTEN
           |              DTE n Secondary Status Word              |  |
           |-------------------------------------------------------| \ /
   DTETMR: |              DTE 1 Timer Variable                     | / \
           |                           .                           |  |
           \                           .                           \ DTEN
           |              DTE n Timer Variable                     |  |
           |-------------------------------------------------------| \ /
   DTBFWD: |                Hdr. Word for DTE 1 Buf                | 
           |   (Ptr. to 2nd Input Buf,, Ptr. to 1st Input Buf)     |
           \                           .                           \
           |                           .                           |
           |             Header Word for DTE n Buffer              |
           |-------------------------------------------------------|
   DTETRA: |             Interrupt Return PC for DTE 1             |
           |                           .                           |
           |-------------------------------------------------------|
           |                           .                           |
           |             Interrupt Return PC for DTE 2             |
           |-------------------------------------------------------| / \
   DTESKP: |                                                       |  |
           |                                                       | 
           \                    Local PDL Stack                    \ DTESZ
           |                                                       |
           |                                                       |  |
           |-------------------------------------------------------| \ /
   DTEACB: |                                                       | / \
           \                   Block to Save ACs                   \  |
           |                                                       | 16
           |-------------------------------------------------------| \ /
   DTEIND: |        Storage for Indirect Function for DTE 1        |*/ \
           |                           .                           |  |
           \                           .                           \ DTEN
           |        Storage for Indirect Function for DTE n        |  |
           |-------------------------------------------------------| \ /
   DTEEND: |     DTE 1 Resident free space debugging storage       | / \
           |                           .                           |  |
           \                           .                           \ DTEN
           |     DTE n Resident free space debugging storage       |  |



                                    105
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


           |-------------------------------------------------------| \ /
   DTEOBL: |     DTE 1 Pointer to section zero output block        | / \
           |                           .                           |  |
           \                           .                           \ DTEN
           |     DTE n Pointer to section zero output block        |  |
           |-------------------------------------------------------| \ /
   DTEIBL: |     DTE 1 Pointer to section zero input block         | / \
           |                           .                           |  |
           \                           .                           \ DTEN
           |     DTE n Pointer to section zero input block         |  |
           |-------------------------------------------------------| \ /
   DTEDID: |          DTE 1    Router's circuit ID list            | / \
           |                           .                           |  |
           \                           .                           \ DTEN
           |          DTE n    Router's circuit ID list            |  |
           |-------------------------------------------------------| \ /
   DCNCID: |            DTE 1 DECnet callback ID list              | / \
           |                           .                           |  |
           \                           .                           \ DTEN
           |            DTE n DECnet callback ID list              |  |
           |-------------------------------------------------------| \ /
   PKTADR: |               Storage for Queue Packets               |*/ \
           |        (One 3-Word Packet/RSX20F Protocol DTE)        |  |
           \                                                       \ PKTSZ1
           |                                                       |  |
           |-------------------------------------------------------| \ /
   COMBUF: | Processor #  |    Index into COMBAS to get to this    | / \--  --
           |            4 |         Processor's Comm Area          |  |  |   |
           |-------------------------------------------------------|  |  |   |
           |            3 |                  ''                    |DTEN+1   |
           |-------------------------------------------------------|  |      |
           |            2 |                  ''                    |  |Header|
           |-------------------------------------------------------|  |Area  |
           |            1 |                  ''                    |  |  |   |
           |-------------------------------------------------------|  |  |   |
           |            0 |                  ''                    |  |  |   |
           |-------------------------------------------------------| \ / --  |
   COMBAS: |                   KL10 "Owned" Area                   |--*      |
           |-------------------------------------------------------| |       |
           |                    "To" DTE1 Area                     | |       |
           |-------------------------------------------------------| |       |
           |                    "To" DTE2 Area                     |  Master |
           |-------------------------------------------------------| Process |
           |                           .                           |   Comm  |
           |                           .                           |   Area  |
           |                           .                           | |






                                    106
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


           |-------------------------------------------------------| |  Communi-
           |                    "To" DTEn Area                     | |    cation
           |-------------------------------------------------------|--    Region
           |                                                       |--
           |                   DTE1 "Owned" Area                   |  DTE1   |
           |                                                       |  Comm   |
           |-------------------------------------------------------|  Area   |
           |                    "To" KL10 Area                     | |       |
           |-------------------------------------------------------| |       |
           |                           .                           | |       |
           |                           .                           | |       |
           |                           .                           | |       |
           |-------------------------------------------------------|--       |
           |                                                       |--       |
           |                   DTEn "Owned" Area                   | | DTEn  |
           |                                                       | | Comm  |
           |-------------------------------------------------------| | Area  |
           |                    "To" KL10 Area                     |--      --
           |-------------------------------------------------------| / \
   TAD11:  \                 Time Packet from -11                  \  3
           |-------------------------------------------------------| \ /
           \                                                       \ / \
   TO11TM: \                  Time Packet to -11                   \  3
           |-------------------------------------------------------| \ /
           \                                                       \ / \
           \                    KLINIK Data Base                   \ KLISIZ
           |-------------------------------------------------------| \ /
   RLDFRK: |           System wide handle of reload fork           |
           |-------------------------------------------------------|
   SNGPK1: |              Single-Packet-1 Header Word              |
           |-------------------------------------------------------| / \
           \                Packet Data (5 Words)                  \  5
           |                                                       | \ /
           |-------------------------------------------------------|
   SNGPK2: |              Single-Packet-2 Header Word              | *
           |-------------------------------------------------------| / \
           \                Packet Data (5 Words)                  \  5
           |                                                       |  |
           +-------------------------------------------------------+ \ /













                                    107
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


   COMQ area for queue packets where a packet (5 words in length) has the
   form:

            0                        17 18                       35
           +-------------------------------------------------------+
           | QINT                      | QLINK                     |
           | Int loc for this function |    Link to next packet    |
           |-------------------------------------------------------|
   QNSPH   | QFNC                      | QDEV                      |
           |     Function work for     |      DTE device code      |
           |       this request        |     for this request      |
           |-------------------------------------------------------|
           |0 QLIN                   17| QMODE  |19 QCNT         35|
           |    Device unit number     |  Data  |  Byte count or   |
           |                           |must be |       byte       |
           |                           |  byte  |       or 0       |
           |                           |  mode  |                  |
           |-------------------------------------------------------|
           | QPNTR                                                 |
           |        Byte pointer for indirect operation  or        |
           |             Local 8-bit datum if QCNT = 0             |
           |-------------------------------------------------------|
           | QCOD                                                  |
           |   Unique code returned to interrupt routine, TTYINT   |
           +-------------------------------------------------------+

            COMQ area is currently assembled for room of ^D20 packets.

























                                    108
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


            0 1 2 3 4 5 6          17 18          29 30          35
           +-------------------------------------------------------+
   DTESTS  | | | | | | |    DTEB1    |     DTEBC    |     DTEST    |
   entry   +-------------------------------------------------------+

                  Bits     Pointer     Contents

                   0       DTERL       If set, DTE exists
                   1       DTEBF       Says which buffer is in use for
                                        RSX20 protocol
                   2       DTBLK       For MCB, to -10 is blocked on
                                        free space
                   3       DTRLD       If set, -11 is being reloaded
                   4       DTKAC       If set, -11 is ill
                   5       DTSTI       Status packet is split
                  6-17     DTEB1       Byte count of list transfer
                 18-29     DTEBC       Byte count remaining for
                                       subsequent transfer
                   31      DTIPU       If set, protocol is running
                 32-35     DTEST       DTE status
                                       DTET10=1--KL10 is receiving
                                        last fragment of message
                                       DTE11=2--11 is receiving bytes
                                       DTE11I=4--11 is receiving an 
                                        indirect queue entry
                                       DTE1F=10--KL10 is receiving 1st 
                                        fragment of a message

























                                    109
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


   DTEST1 is parallel to DTESTS and contains current operation  data  and
   special request bits for "To" -11 conditions.

            0                15 16                   31 32 33 34 35
           +-------------------------------------------------------+
   DTEST1  |DT1FC              |DT1DV                  |  |  |     |
   entry   +-------------------------------------------------------+

                  Bits     Pointer     Contents

                  0-15     DT1FC       Current function code
                 16-31     DT1DV       Current device code
                  32       DT1TM       -11 wants time of day
                  33       DT1ID       Waiting for indirect setup


           Storage for indirect packets:

            0        7 8        15 16 17                          35
           +--------------------------------------------------------+
   DTEIND  |  INUNT   |   INCNT   |  |                              |
   entry   +--------------------------------------------------------+

                  Bits     Pointer     Contents

                  0-7      INUNT       Unit
                  8-15     INCNT       Count
                  16       INVLD       If set, says unit field is invalid


   PKTADR is storage for currently activated DTE  packets  for  each  DTE
   (packet taken from the linked list of packets on the queue in COMQ and
   placed here).  The packet has the following form:

            0                    15 16                   31 32   35
           +-------------------------------------------------------+
           | HDCNT                 | HDFNC                 |       |
           |         Count         |       Function        |       |
           |-------------------------------------------------------|
           | HDDEV                 | HDSPR                 |       |
           |      Device code      |         Spare         |       |
           |-------------------------------------------------------|
           |          7|8          | HDDT1                 |       |
           | HDLIN     | HDDAT     |  Datum for a single   |       |
           |  Line #   |  Datum *  |     datum packet      |       |
           +-------------------------------------------------------+

        Datum could be a character (direct packet case) or
        Max number of characters to be sent (indirect packet case)



                                    110
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


   COMBAS "Owned" Area Block Format

           +-------------------------------------------------------+
           |                         Flags                         | *
           |-------------------------------------------------------|
           | CMLNK                                                 |
           |               Pointer to next processor               |
           |-------------------------------------------------------|
           |                                                       |
           \                                                       \
           |                                                       |
           |-------------------------------------------------------|
   KPALIV  | CMKAC                                                 |
      =5   |              Processor Keep Alive Count               |
           |-------------------------------------------------------|
   CMPCW=6 |                        PC word                        |
           |-------------------------------------------------------|
   CMPIWD  |                     CONI PI, word                     |
      =7   |-------------------------------------------------------|
   CMPGWD  |                    CONI PAG, word                     |
      =10  |-------------------------------------------------------|
   CMPDWD  |                    DATAI PAG, word                    |
      =11  |-------------------------------------------------------|
   CMAPRW  |                    CONI APR, word                     |
      =12  |-------------------------------------------------------|
   CMDAPR  |                    DATAI APR, word                    |
      =13  |-------------------------------------------------------|
           |                                                       |
           \                                                       \
           |                                                       |
           +-------------------------------------------------------+


            0 1   3 4 5 6    11 12   16 17  19 20                35
   Word 0  +-------------------------------------------------------+
           | |     |   | CPVER | CMNPR |      |CMNAM               |
           +-------------------------------------------------------+

                  Bits     Pointer     Contents

                   0       CMTEN       Set if area belongs to KL10
                  1-3      CMVER       Communication area version number
                  6-11     CPVER       Protocol version number
                 12-16     CMNPR       Number of processors represented
                                        in this area (including owner)
                 17-19     CMSIZ       Size of area in 8-word blocks
                 20-35     CMNAM       Processor name (= serial number)





                                    111
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


   "To" Area Block Format

           +-------------------------------------------------------+
           |                         Flags                         | *
           |-------------------------------------------------------|
           | CMPPT                                                 |
           | Pointer to "To" processor's owned communication area  |
           |-------------------------------------------------------|
           |                         Flags                         | *
           |-------------------------------------------------------|
           |0    3|4                    19|20                    35|
           |CMTMD | CMPCT                 | CMQCT                  |
           | Mode | Piecemeal Ctr. (Bits  |   Count of words in    |
           |  of  |0-19 used by prot. ver.|     current queue      |
           | xfer |     VNMCB only)       |                        |
           |-------------------------------------------------------|
           | CMRLF                                                 |
           |          Reload parameter for "To" processor          |
           |-------------------------------------------------------|
           | CMKAK                                                 |
           |Owning processor's copy of "To" processor's Keep Alive |
           +-------------------------------------------------------+


            0 1 2 3 4    10 11     16 17  19 20                  35
           +-------------------------------------------------------+
   Word 0  | | |   |       |         |      |        CNPNM         |
           +-------------------------------------------------------+

                  Bits     Pointer     Contents

                   0       CMPRO       If set, it implies connected to
                                        a KL10
                   1       CMDTE       If set, there is a DTE connecting
                                        this processor and owning
                                        processor
                  2-3      CMDTN       If CMDTE is set, this is the number
                                        of that connecting DTE
                 11-16     CMVRR       Protocol in use by the 2 processors
                 17-19     CMSIZ       Size of "to" area in 8-word blocks
                 20-35     CMPNM       "To" processor number











                                    112
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


            0 1 2 3 4     12 13 14  16 17 18 19 20     27 28     35
           +-------------------------------------------------------+
   Word 2  | | | | |        |  |      |  |  |  |  CMOIC  |  CM1IC  |
           +-------------------------------------------------------+

        Symbol    Bits     Pointer     Contents

                   0       CMPWF       Power fail indicator -11
                   1       CML11       Wants reload (set by -11)
                   2       CMINI       Initialization bit for MCB
                                        protocol only
                   3       CMTST       Valid examine if set
                                        (should always be set)
                  13       CMQP        Set if using queued protocol
                  17       CMFWD       -11 doing full word transfer
                                        (set by -11)
        CMIP      18                   -11 doing indirect transfer
        CMTOT     19                   "Toit" bit. Set to 1 by KL10
                                        in -11's section of -10's
                                        Comm area after -11 sets
                                        QMode bit or increments
                                        Q-count, and after -10
                                        processes the doorbell.  
                                       Cleared by KL10 after
                                        receiving T010DN.  Assures
                                        -11 that the KL10 has not
                                        lost a T010DN interrupt
                 20-27     CMOIC       -11s wrap around count of
                                        direct Q transfer
                 28-35     CM1IC       KL10's wrap around count of
                                        direct Q transfers.


            0         7 8        16 17        24 25       31 32  35
   SNGPK1  +-------------------------------------------------------+
       /2  |         Flags         |  Link to next packet   |      | *
           |-------------------------------------------------------|
           |   Packed byte count   |       Function         |      |
           |-------------------------------------------------------|
           |        Device         |         Spare          |      |
           |-------------------------------------------------------|
           |  Line #   |   Datum   |   Line #   |   Datum   |      |
           |-------------------------------------------------------|
           |  Line #   |   Datum   |   Line #   |   Datum   |      |
           |-------------------------------------------------------|
           |  Line #   |   Datum   |   Line #   |   Datum   |      |
           +-------------------------------------------------------+





                                    113
                               MONITOR TABLES
                          DTE-STORAGE-AREA (Cont.)


            0 1 2 3              16 17                    31 32  35
           +-------------------------------------------------------+
   Header  | | | |                 |                        |      |
   Word    +-------------------------------------------------------+

                  Symbol   Bits        Contents

                  SNGONQ    0          On the DTE packet queue pointed
                                        to by DTEQS
                  SNGAVL    1          Packet has space available
                  SNGACT    2          Packet active
                                        (that is, DTE processing it)
                           16-31       Link to next packet







































                                    114
                               MONITOR TABLES


                                  DTEDTV

   DTE Protocol Device Dispatch Table.  The  entries  with  the  dispatch
   address TTYDTV are for the CTY, DL11, DH11 and DLS devices.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   DTEDTV: |              Reserved for Unknown Device              |
           |-------------------------------------------------------|
           |                        TTYDTV                         |
           |-------------------------------------------------------|
           |                        TTYDTV                         |
           |-------------------------------------------------------|
           |                        TTYDTV                         |
           |-------------------------------------------------------|
           |                        TTYDTV                         |
           |-------------------------------------------------------|
           |                        LPTDTV                         |
           |-------------------------------------------------------|
           |                        CDRDTV                         |
           |-------------------------------------------------------|
           |                  0 (Unknown Device)                   |
           |-------------------------------------------------------|
           |                        FEDTV                          |
           +-------------------------------------------------------+

























                                    115
                               MONITOR TABLES


                                    EC

   This is the DECnet event communication block,  a  communications  area
   between a layer and NTMAN.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          |               ECLOS               |               ECCNT                |
          |      Count of "events lost"       |     Count of events on queue       |
          |------------------------------------------------------------------------| 
          | |   |     |                       |               ECETY                |
|       * | |   |ECLAY|                       | Entity type of DECnet device this  |
          | |   |     |                       |       EC block  belongs to         |
          |------------------------------------------------------------------------| 
   ECEID  |          Entity ID of DECnet device this EC block  belongs to          |        
          |------------------------------------------------------------------------| 
          |               ECMAX               |                                    |
          | Maximum number of events on queue |                                    |
          |              allowed              |                                    |
          +------------------------------------------------------------------------+ 

           Field ECDEL     (0-0)   This EC block marked for deallocation

           Field ECLAY     (3-5)   DECnet layer this EC block belongs to


























                                    116
                               MONITOR TABLES


                                    EL

   The DECnet EL structure (Link Block) holds  all  the  NSP  information
   about this logical link.

   Defined in:  D36PAR
                                            Format                                  
          +------------------------------------------------------------------------+   /\   
   ELAPQ  |                    Next in queue of all link blocks                    | QP.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   ELHBQ  |                Next in queue of links in a hash bucket                 | QP.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   ELJFQ  |              Next in queue of links needing jiffy service              | QP.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
          | | | | | | | |   |   ELSTA   |     |               ELSIZ                |
          |      ELFLG      | NSP state |     |Max size of a segment on this link  | *
          |                 |  of this  |     |                                    |
          |                 |   link    |     |                                    |
          |------------------------------------------------------------------------| 
          |               ELLLA               |               ELRLA                |
          |        Local link address         |        Remote link address         |
          |------------------------------------------------------------------------|   /\   
   ELORQ  |  Queue header for MBs sent to ROUTER and  expected to be returned to   | QH.LEN 
          \                                 LLINKS                                 \   \/   
          |------------------------------------------------------------------------| 
   ELCLC  |  Count of retries left, trying to close a  port waiting for MBs to be  |        
          |                   returned from  ROUTER and children                   |
          |------------------------------------------------------------------------| 
          |               ELORC               |     |     |         ELDSG          |
          |    Count of msgs out in ROUTER    |     |     |   Msg segment being    |
          |                                   |     |     | timed for delay calc   |
          |                                   |     |     | (must be segnum-size   |
          |                                   |     |     |   field for CMODxx)    |
          |------------------------------------------------------------------------| 
   ELDTM  |                        Time msg was first sent                         |        
          |------------------------------------------------------------------------| 
          |               ELNNM               |                                    |
          |     The remote's node number      |                                    |
          |------------------------------------------------------------------------| 
   ELNDB  |                         Ptr to NSP node block                          |        
          |------------------------------------------------------------------------| 
   ELTMA  |                            Inactivity timer                            |        
          |------------------------------------------------------------------------| 
   ELSCV  |                Session control call vector base address                |        
          |------------------------------------------------------------------------| 
   ELSCB  |                        Session control block ID                        |        
          |------------------------------------------------------------------------| 
   ELCIM  |                          Ptr to (R)CI message                          |        


                                    117
                               MONITOR TABLES
                                 EL (Cont.)


          |------------------------------------------------------------------------| 
   ELDIM  |                           Ptr to DI message                            |        
          |------------------------------------------------------------------------|   /\   
   ELNSL  |                        The normal sublink block                        | ES.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   ELOSL  |                        The other sublink block                         | ES.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
   ELCIR  |                 Output circuit for loopback connection                 |        
          |------------------------------------------------------------------------| 
   ELCHK  |                   Address of this EL, for addr check                   |        
          +------------------------------------------------------------------------+ 

           For field ELFLG(0-8):
                   ELOJQ      0    Link is on the jiffy-request queue
                   ELSNC      1    Set if not yet told SC about no conf
                   ELCNF      2    Set if we have confidence in link
                   ELSCM      3    Send connect ACK message next jiffy
                   ELSDM      4    Send disconnect confirm message next jiffy
                   ELABO      5    Aborting this logical link
                   ELDTO      6    Delay timer is for "other" sublink

           Field ELVER     (18-20) Version of remote NSP, see VER3.1,VER3.2




























                                    118
                               MONITOR TABLES


                            ENQ/DEQ-LOCK-BLOCK

   Enqueue Lock-Block.  Each resource is described in a lock-block.   The
   lock-block is created at the time of the first request.

   Defined in:  ENQ

                                   Format

            0                     17  18                         35
           +-------------------------------------------------------+
         0 |  ENQLHC                                               |
           |                Back Pointer to Last                   |
           |              Lock-Block on Hash Chain                 |
           |-------------------------------------------------------|
         1 |  ENQNHC                                               |
           |                  Pointer to Next                      |
           |              Lock-Block on Hash Chain                 |
           |-------------------------------------------------------|
         2 |  ENQLLQ                                               |
           |                  Back Pointer to                      |
           |              Last Q-Block on Lock Queue               |
           |-------------------------------------------------------|
         3 |  ENQNLQ                                               |
           |                 Forward Pointer to                    |
           |             First Q-Block on Lock Queue               |  
           |-------------------------------------------------------|
           |  ENQFLG        |          |  ENQLVL                   |
         4 |      Flags     | Reserved |       Level Number        | *
           |                |          |       of this Lock        |
           |-------------------------------------------------------|
           |  ENQTR                    |  ENQRR                    |
         5 |   Total Number of         |    Remaining Number of    |
           |  Resources in this Pool   |  Resources in this Pool   |
           |-------------------------------------------------------|
           |  ENQTS                                                |
         6 |                      Time Stamp                       |
           |              Time of Last Request Locked              |
           |-------------------------------------------------------|
         7 |  ENQFBP                                               |
           |                   Free Block Pointer                  |
           |                    to Free Q-Block                    |
           |-------------------------------------------------------|
        10 |  ENQLT                                                |
           |                  Long Term Lock List                  |
           |                       for System                      |
           |-------------------------------------------------------|
           |  ENQOFN                   |  ENQLEN                   |
        11 |    OFN, or -2, or -3,     |      Length of this       |
           |  or 400000 + Job Number   |        Lock-Block         |



                                    119
                               MONITOR TABLES
                         ENQ/DEQ-LOCK-BLOCK (Cont.)


           |-------------------------------------------------------|
|          |  ENQNMS                   |  ENQHSH                   |
|       12 |    Number of Words in     |    Hash value for this    |
|          |      the Mask Block       |       Lock Block          |
|          |-------------------------------------------------------|
|          |  ENQAFP                                               |
|       13 |     Forward Pointer to Lock Block Action List         |
|          |-------------------------------------------------------|
|          |  ENQABP                                               |
|       14 |     Backward Pointer to Lock Block Action List        |
|          |-------------------------------------------------------|
|          |  ENQTXT             ASCIZ String                      |
|       15 |                          or                           |
|          |                500000,,0 + User Code                  |
|          +-------------------------------------------------------+

   The flags word must occur in the same position in both the  Lock-Block
   and  the  Q-Block.  The flags word is used to distinguish a Lock-Block
   from a Q-block.
|  
|  Defined in:  ENQPAR


            0           11 12        17 18                       35
           +-------------------------------------------------------+
    Word 4 | ENQFLG       |            | ENQLVL                    |
           |   Flags      | Reserved   |   Level # of this Lock    |
           +-------------------------------------------------------+

        Symbol    Bits     Pointer     Meaning

|                  0-2                 Unused
|     EN.SDO=400    3                  Scheduling pass needed on
|                                      Lock-Block
|     EN.CLL=200    4                  Cluster-wide queue block or
|                                      Cluster-wide lock-block
|     EN.NOV=100    5                  No vote for this lock-block
|                                      Set during caching and for -1
|                                      type locks
      EN.LTL=40     6                  Long Term Lock
      EN.INV=20     7                  This Q-Block is invisible
      EN.LOK=10     8                  The Q-Block has the Lock
                                        Locked.
      EN.TXT=4      9                  This Block has a Text
                                        String Identifier.
      EN.EXC=2     10                  Request is Exclusive
      EN.LB=1      11                  This is the Lock-Block
                  12-17                Reserved
                  18-35    ENQLVL      Level # of this lock.



                                    120
                               MONITOR TABLES


                          ENQ/DEQ - STORAGE AREA

   Enqueue/Dequeue Storage Area.  The non-resident  local  area  for  the
   ENQ/DEQ  Facilty  is  illustrated  first  followed by the resident bit
   table, ENFKTB.  A bit is set in the  ENFKTB  bit  table  if  the  fork
   should  be  woken  up  or  interrupted  because  it owns a lock.  (The
   Scheduler's wake-up test routine address is ENQTST.)

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   HSHTBL: |                                                       |* |
           |                    Hash table for                     |
           |                       ENQ locks                       | HSHLEN* 2
           |               Two words per logical slot              |
           \                                                       \  |
           |-------------------------------------------------------| \ /
   ENQLOK: |            Data base lock for ENQ and DEQ             |
           |                     (-1 if free)                      |
           |-------------------------------------------------------|
   ENQLTL: |                List of long term locks                |
           |-------------------------------------------------------|
   ENQLTS: |            Time of next garbage collection            |
           +-------------------------------------------------------+

   Each logical slot in HSHTBL is two words long:

           +-------------------------------------------------------+
   HSHTBL: |               Back Pointer                            |
           |-------------------------------------------------------|
           |              Forward Pointer                          |
           |-------------------------------------------------------|
           |               Back Pointer                            |
           |-------------------------------------------------------|
           |              Forward Pointer                          |
           +-------------------------------------------------------+
                                .
                                .
                                .

           +-------------------------------------------------------+
           |               Back Pointer                            |
           |-------------------------------------------------------|
           |              Forward Pointer                          |
           +-------------------------------------------------------+






                                    121
                               MONITOR TABLES
                       ENQ/DEQ - STORAGE AREA (Cont.)


|  Resident storage
|  
|          +-------------------------------------------------------+
|  ELBCSH: |        Lock-Block Caching Flag (-1 if caching)        |
|          |-------------------------------------------------------|
   ENFKTB: |             Wake-up table  (one bit per fork)         |
           |                           .                           |
           \                           .                           \
           |-------------------------------------------------------|
   LCKDBT: |   Bit table for DIR lock ENQ/DEQ  (one bit per fork)  |
           |                           .                           |
           \                           .                           \
           +-------------------------------------------------------+

   *  The name (or identifying number) of  a  lock  block  is  hashed  to
   provide  a  number.  This number, module HSHLEN, then doubled, is used
   as an index into HSHTBL.  If the hashing  algorithm  yields  the  same
   index  for  more  than one lock block name, the lock blocks are linked
   together; the HSHTBL entry is the linked list header.

































                                    122
                               MONITOR TABLES


                                    EPT

   Executive Process Table.  This memory resident table pointed to by the
   Executive   Base   Register  (EBR),  contains  the  vectored  dispatch
   addresses for system events.  All device interrupts pass control to  a
   specific offset position in this table.

   This table also includes the executive section map table, the time  of
   day  clock  and  arithmetic  trap instructions which are executed when
   arithmetic conditions occur in executive mode.

   Defined in:  STG

                                   Format
                   +-------------------------------------+
            KIEPT: |     Eight Channel Logout Areas      |
                   |                                     |
                   |Each: 0 Initial Channel Command      |
                   |      1 Gets Channel Status Word     |
                   |      2 Gets Last Updated Command    |
                   |      3 Reserved for Channel's       |
                   |        Vectored Interrupt Location  |
           KIEPT+37\                                     \
                   |-------------------------------------|
                 40|                                     |
                   |                                     |
                   |Standard Priority Interrupt Instruc. |
                 57\                                     \
                   |-------------------------------------|
                 60|                                     |
                   |  Four Channel Block Fill Words      |
                 63|                                     |
                   |-------------------------------------|
                 64|                                     |
                   |              Reserved               |
                  .|                                     |
                 77\                                     \
                   |-------------------------------------|
   SMTEPT=KIEPT+100|          (if 2020 System)           |
                   |-------------------------------------|
                101|                                     |
                   |                                     |
                   |              Reserved               |
                137\                                     \









                                    123
                               MONITOR TABLES
                                EPT (Cont.)


                   |-------------------------------------|
                   |  Four 8-word DTE20 Control Blocks   |
   DTEEBP=KIEPT+140|  Each: 0 To -11 Byte Pointer        |
   DTETBP=KIEPT+141|        1 To -10 Byte Pointer        |
   DTEINT=KIEPT+142|        2 Interrupt Location         |
                143|        3 Reserved                   |
   DTEEPW=KIEPT+144|        4 Examine Protection Word    |
   DTEERW=KIEPT+145|        5 Examine Relocation Word    |
   DTEDPW=KIEPT+146|        6 Deposit Protection Word    |
   DTEDRW=KIEPT+147|        7 Deposit Relocation Word    |
                   |-------------------------------------|
                   |                                     |
                   |         DTE1 Control Block          |
                   |                                     |
                   |-------------------------------------|
                   |                                     |
                   |         DTE2 Control Block          |
                   \                                     \
                   |-------------------------------------|
                   |                                     |
                   |         DTE3 Control Block          |
                177\                                     \
                   |-------------------------------------|
   EPTMHI=KIEPT+200|                                     |
                   |                                     |
                   |        Available to Software        |
                   |                                     |
                417\                                     \
                   |-------------------------------------|
   EPTTPI=KIEPT+420|      LUUO from Executive Mode       |
                   |              (.LUTRP)*              |
                   |-------------------------------------|
                421| Executive Arithmetic Overflow Trap  |
                   |         Instruction (JFCL)*         |
                   |-------------------------------------|
                422|    Executive Stack Overflow trap    |
                   |        Instruction (.PDOVT)*        |
                   |-------------------------------------|
                423|  Executive Trap 3 Trap Instruction  |
                   |               (JFCL)*               |
                   |-------------------------------------|
                424|                                     |
                   |              Reserved               |
                437\                                     \
                   |-------------------------------------|
                440|                                     |
                   |        Reserved for Software        |
                443\                                     \




                                    124
                               MONITOR TABLES
                                EPT (Cont.)


                   |-------------------------------------|
   DTEFLG=KIEPT+444|       Operation Complete Flag       |
                   |-------------------------------------|
   DTECFK=KIEPT+445|        Clock Interrupt Flag         |
                   |-------------------------------------|
   DTECKI=KIEPT+446|     Clock Interrupt Instruction     |
                   |-------------------------------------|
   DTET11=KIEPT+447|          "To" 11 Argument           |
                   |-------------------------------------|
   DTEF11=KIEPT+450|         "From" 11 Argument          |
                   |-------------------------------------|
   DTECMD=KIEPT+451|            Command Word             |
                   |-------------------------------------|
   DTESEQ=KIEPT+452|   DTE20 Operation Sequence Number   |
                   |-------------------------------------|
   DTEOPR=KIEPT+453|     Operation in Progress Flag      |
                   |-------------------------------------|
   DTECHR=KIEPT+454|        Last Typed Character         |
                   |-------------------------------------|
   DTETMD=KIEPT+455|  Monitor TTY Output Complete Flag   |
                   |-------------------------------------|
   DTEMTI=KIEPT+456|       Monitor TTY Input Flag        |
                   |-------------------------------------|
   DTESWR=KIEPT+457|       Console Switch Register       |
                   |-------------------------------------|
                460|                                     |
                   |        Reserved for Software        |
                477\                                     \
                   |-------------------------------------|
                500|                                     |
                   |              Reserved               |
                507\                                     \
                   |-------------------------------------|
   TIMBAS=KIEPT+510|                                     |
                   |              Time Base              |
                511|                                     |
                   |-------------------------------------|
                512|                                     |
                   |     Performance Analysis Count      |
                513|                                     |
                   |-------------------------------------|
   TIMVIL=KIEPT+514| Internal Counter Interrupt Instruc. |
                   |-------------------------------------|
   MSECTB=KIEPT+540|           EXEC SECTION 0            |
                   |                                     |
                   |                                     |
                   |                                     |
                577\           EXEC SECTION 37           \




                                    125
                               MONITOR TABLES
                                EPT (Cont.)


                   |-------------------------------------|
   EPTMLO=KIEPT+600|                                     |
                   |                                     |
   EPTLBP=KIEPT+700|-------------------------------------|
                   |     OWGBP Microcode Table Storage   |
                722|-------------------------------------|
                   |                                     |
                   |                                     |
                   |                                     |
                777\        Available to Software        \
                   +-------------------------------------+

       *  These values are placed into the table when the EPT is
          initialized at system startup.






































                                    126
                               MONITOR TABLES


                                    ES

   The DECnet Sublink Block is part of the  link  block.   It  holds  the
   information about the "normal" and the "other" sublinks.

   The structure name ES is used instead of  the  more  obvious  NS  (NSP
   Sublink)  to  avoid  a conflict with the other NS structure defined in
   this universal file.  The "E" stands for the  new  name  for  the  NSP
   layer:  "End-to-end" layer.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | | | | | | | | |       | |   | |   |      ESGOL      |      ESCGL       |
          |         ESFLG         | |   | |   |  Data request   |After-congestion  | *
          |                       | |   | |   | goal (9 for DDT |  recovery goal   |
          |                       | |   | |   |      ease)      |                  |
          |------------------------------------------------------------------------| 
          |     ESXLD     |     ESXRD     |     ESXSD     |                        |
          |   Xmit DRQS   |   Xmit DRQS   |Xmit DRQS need |                        |
          |outstanding to |outstanding to | to send to SC |                        |
          |   local SC    |  remote NSP   |               |                        |
          |------------------------------------------------------------------------| 
          |     ESRLD     |     ESRRD     |     ESRSD     |                        |
          | Receive DRQS  | Receive DRQS  | Receive DRQS  |                        |
          |outstanding to |outstanding to | need to send  |                        |
          |   local SC    |  remote NSP   |     to SC     |                        |
          |------------------------------------------------------------------------| 
          |         ESLMA         |         ESLAR         |         ESLMR          |
          |  Last message number  |Last ACK received (and | Last message received  |
          |       assigned        |      processed)       |                        |
          |------------------------------------------------------------------------|   /\   
   ESAKQ  |                   Queue header for the to-be-acked Q                   | QH.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   ESRCQ  |                     Queue header for the receive Q                     | QH.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   ESXMQ  |                      Queue header for the xmit Q                       | QH.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
          |         ESCWS         |         ESCDA         |         ESDLT          |
          |  Current window size  | # of ACKs since last  |    ACK delay timer     |
          |                       |     window change     |                        |
          +------------------------------------------------------------------------+ 






                                    127
                               MONITOR TABLES
                                 ES (Cont.)


           For field ESFLG(0-11):
                   ESOTH      0    Set if this is other sublink
                   ESACK      1    Send ACK for this sublink next jiffy
                   ESNAK      2    Send NAK to PH2 NSP (turn ACK on too)
                   ESROF      3    Receive is off
                   ESROC      4    Receive off has changed
                   ESXOF      5    Xmit is off
                   ESBFR      6    Remote is "buffer-rich" on this link
                   ESDLY      7    ACK delaying allowed

           Field ESRFL     (13-14) Receive flow control type

           Field ESXFL     (16-17) Xmit flow control type







































                                    128
                               MONITOR TABLES


                                    ET

   For test and debug purposes, there is an extra function of  the  NTMAN
   JSYS.  This function logs an event or signal.

   The function code is -5 (.NTTEV)

   The entity ID and type for the event are taken from the standard words
   in the NTMAN argument block.

   Word .NTSEL points to a secondary  argument  block  of  the  following
   layout.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | |                                 |               ETCNT                | *
          | |                                 |         Replication count          |
          |------------------------------------------------------------------------| 
          |          ETCCL          |  ETCTY  |               ETDLN                |
          |       Event class       |  Event  |       Data length in bytes         |
          |                         |  type   |                                    |
          |------------------------------------------------------------------------|   /\   
   ETDAT  |                             Space for data                             | <44/4> 
          \                                                                        \   \/   
          +------------------------------------------------------------------------+ 

           Field ETSIG     (0-0)   Set if this is a signal























                                    129
                               MONITOR TABLES


                              EXEC-PG-MAP-TBL

   Executive Page Map Table.  This 512-word memory resident  table  holds
   or  points  to  other  tables that hold all of the mapping information
   needed by  the  firmware  to  translate  executive  (monitor)  virtual
   addresses  in  a  given section into physical memory addresses.  It is
   pointed to by an entry in the monitor's section table in the Executive
   Process Table (EPT).

   The four possible formats  for  an  entry  in  this  table  (that  is,
   Immediate,  shared,  indirect or null pointers) are illustrated below.
   The details of these four  possible  pointer  words  as  well  as  the
   mechanics of the virtual to physical translation process for a monitor
   page is identical to that described for the User-Page Map  Table  (See
   User-Pg-Map-Tbl)

   Defined in:  STG

                                   Format
           +-------------------------------------------------------+
   MMAP: * |                   Immediate Pointer                   |  / \
           |-------------------------------------------------------|   |
           |0    2|3      8|     |12                             35|   |
           | Op   |Access  |     |    STGADR                       |   |
           |Code 1|  Bits  |     |  Storage Address                |   |
           |-------------------------------------------------------|   |
           |                  or Shared Pointer                    |   |
           |-------------------------------------------------------|   |
           |0    2|3      8|          |18                        35|   |
           | Op   |Access  |          | SPTX                       |   |
           | Code |  Bits  |          |  SPT. index                |   |
           |  2   |        |          |  (Holds Pg's Stor Adr.)    |
           |-------------------------------------------------------| Virtual
           |                 or Indirect Pointer                   |  Pg #
           |-------------------------------------------------------| 0-777
           |0    2|3      8|9       17|18                       35 |
           | Op   |Access  | IPPGN    | SPTX                       |   |
           | Code |  Bits  |     PN   | SPT index                  |   |
           |  3   |        |          | (Holds Pg Tb's Stor. Adr)  |   |
           |-------------------------------------------------------|   |
           |                   or Null Pointer                     |   |
           |-------------------------------------------------------|   |
           |0    2|3      8|                                       |   |
           | Op   |Access  |           0 (Nonexistent Pg)          |   |
           |Code 0|  Bits  |                                       |   |
           |-------------------------------------------------------|   |
           \                           .                           \  \ /
           +-------------------------------------------------------+

   * Currently MMAP is the monitor's page map table  for  section  0  and
   section  1.   The  layout  of  the monitor's virtual address space for
   section 0 is described in Appendix B of the Monitor Structures Book.

                                    130
                               MONITOR TABLES


                                    FA

   This is the DECnet  Filter  argument  block  which  is  used  to  pass
   arguments to the EV.FIL function of NMXEVT.

   Defined in:  D36PAR

                                            Format                                  

                                    Filter argument block                           
          +------------------------------------------------------------------------+ 
          |               FACCL               |               FACTY                |
          |            Event class            |            Event type              |
          +------------------------------------------------------------------------+ 







































                                    131
                               MONITOR TABLES


                                    FB

   This is the Free Block pointer used by DECnet for maintaining  a  list
   of free storage.

   Defined in:  D36COM

                                            Format                                  

          +------------------------------------------------------------------------+ 
   FBNXT  |                    Forward pointer in a free block                     | 
          +------------------------------------------------------------------------+ 









































                                    132
                               MONITOR TABLES


                                    FDB

   File Description Block.  All attributes of a file are  stored  in  its
   description block (FDB) maintained in the file's directory.  An FDB is
   built in the directory's free space area when a file is created.  This
   table is referenced by the DIR table.

   Defined in:  PROLOG, MONSYM

                                   Format
           +-------------------------------------------------------+
   .FBHDR  |0                        17|18    23|24              35|
      =0   |  FBTYP                    |  FBVER |  FBLEN           |
           |      .TYFDB (400100)      | Ver. # |      Length      |
           |-------------------------------------------------------|
   .FBCTL  |0                                                    35|
      =1   | FBFLG                                                 | *
           |                         Flags                         |
           |-------------------------------------------------------|
   .FBEXL  |  2|3  FBEXL                                           |
      =2   |   |              Link to FDB of Next Extension        |
           |-------------------------------------------------------|
   .FBADR  |  FBADR                                                |
      =3   |          Disk Address of File's Index Block           |
           |-------------------------------------------------------|
   .FBPRT  |  FBPRT                                                |
      =4   |                 Protection of the file                |
           |          500000           |     File Access Bits      |
           |-------------------------------------------------------|
   .FBCRE  |  FBCRE                                                |
      =5   |          Date and Time of Last Write to File          |
           |-------------------------------------------------------|
   .FBAUT  |  FBAUT                                                |
      =6   |               Pointer to Author String                |
           |-------------------------------------------------------|
   .FBGEN  |  FBGEN                    |FBDRN                      | *
      =7   |     Generation Number     | Dir.# (if it's a Dir File)|
           |-------------------------------------------------------|
   .FBACT  |  FBACT                                                |
      =10  |              500000,,0 + Account Number               |
           |                          or                           |
           |               Pointer to Account String               |
           |-------------------------------------------------------|
   .FBBYV  |0      5|6     11|  |14  17|18                       35| *
      =11  | FBGNR  | FBBSZ  |  |FBMOD |  FBNPG                    |
           |# Gens. |Byte Sz |  | Mode |  # of Pages in File       |
           |-------------------------------------------------------|
   .FBSIZ  |  FBSIZ                                                |
      =12  |                  # of Bytes in File                   |




                                    133
                               MONITOR TABLES
                                FDB (Cont.)


           |-------------------------------------------------------|
   .FBCRV  |  FBCRV                                                |
      =13  |               Date and Time of Creation               |
           |-------------------------------------------------------|
   .FBWRT  |  FBWRT                                                |
      =14  |           Date and Time of Last User Write            |
           |-------------------------------------------------------|
   .FBREF  |  FBREF                                                |
      =15  |         Date and Time of Last Nonwrite Access         |
           |-------------------------------------------------------|
   .FBCNT  |  FBNWR                    |  FBNRF                    |
      =16  |        # of Writes        |      # of References      |
           |-------------------------------------------------------|
   .FBBK0  |  FBBK0                                                | *
      =17  |                    Backup Word #1                     |
           |-------------------------------------------------------|
   .FBBK1  |  FBBK1                                                |
      =20  |                    Backup Word #2                     |
           |-------------------------------------------------------|
   .FBBK2  |  FBBK2                                                |
      =21  |                    Backup Word #3                     |
           |-------------------------------------------------------|
   .FBBBT  |  FBBBT                                                | *
      =22  |                 Tape system flag bits                 |
           |-------------------------------------------------------|
   .FBNET  |  FBNET                                                |
      =23  |          Date and time of online expiration           |
           |-------------------------------------------------------|
   .FBUSW  |  FBUSW                                                |
      =24  |                  User Settable Word                   |
           |-------------------------------------------------------|
   .FBGNL  |  2|3  FBGNL                                           | 
      =25  |   |          Link to FDB of Next Generation           |
           |-------------------------------------------------------|
   .FBNAM  |  FBNAM                                                |
      =26  |              Pointer to File Name Block               |
           |-------------------------------------------------------|
   .FBEXT  |  FBEXT                                                |
      =27  |              Pointer to Extension Block               |
           |-------------------------------------------------------|
   .FBLWR  |                                                       |
      =30  |             Pointer to Last Writer String             |
           |-------------------------------------------------------|
   .FBTDT  |  FBTDT                                                |
      =31  |    Date and time of archive/collection tape write     |
           |-------------------------------------------------------|
   .FBFET  |  FBFET                                                |
      =32  |         Date and time of off-line expiration          |




                                    134
                               MONITOR TABLES
                                FDB (Cont.)


           |-------------------------------------------------------|
   .FBTP1  |  ARTP1                                                |
      =33  |       Tape ID for first archive/collection run        |
           |-------------------------------------------------------|
   .FBSS1  |  TSN1                     |  TFN1                     |
      =34  |  Saveset # for 1st tape   |  Tape file # in saveset   |
           |-------------------------------------------------------|
   .FBTP2  |  ARTP2                                                |
      =35  |       Tape ID for second archive/collection run       |
           |-------------------------------------------------------|
   .FBSS2  |  TSN2                     |  TFN2                     |
      =36  |  Saveset # for 2nd tape   |  Tape file # in saveset   |
           +-------------------------------------------------------+


            0 1 2 3 4 5 6 7 8 9 0 1 2 3 14 17 18 19 20           35
           +-------------------------------------------------------+
   .FBCTL  | | | | | | | | | | | | | | |     |  |  |  |            |
           +-------------------------------------------------------+


        Symbol    Bits     DEFSTR      Content

        FB%TMP     0       FBTMP       File is temporary
        FB%PRM     1       FBPRM       File is permanent
        FB%NEX     2       FBNEX       No extension for this file 
                                       yet; file doesn't really exist.
        FB%DEL     3       FBDEL       File is deleted
        FB%NXF     4       FBNXF       File doesn't exist (first 
                                       write not complete)
        FB%LNG     5       FBLNG       Long file
        FB%SHT     6       FBSHT       Reserved for DEC
        FB%DIR     7       FBDIR       File is a directory
        FB%NOD     8       FBNOD       File is not saved by backup
                                       system
        FB%BAT     9                   File may have bad pages
        FB%SDR    10       FBSDR       This directory has subdirectories
        FB%ARC    11       FBARC       File has archive status
        FB%INV    12       FBINV       File is invisible
        FB%OFF    13       FBOFF       File is off-line
        FB%FCF    14-17                File class field
                                         0 = .FBNRM   Not an
                                         RMS file
                                         1 = .FBRMS   RMS file
        FB%NDL    18                   File is not delete table
        FB%WNC    19                   Last write not closed
        FB%FOR    20                   FORTRAN data file
|       FB%SEC    21                   File is secure
|                                      (ACJ consulted on each access)



                                    135
                               MONITOR TABLES
                                FDB (Cont.)


            0                        17 18                       35
           +-------------------------------------------------------+
   .FBGEN  |          FBGEN            |            FBDRN          |
           +-------------------------------------------------------+


        Symbol    Bits     DEFSTR      Content

        FB%GEN     0-17    FBGEN       Generation number
        FB%DRN    18-35    FBDRN       Directory number


            0    5 6    11 2 3 14    17 18                       35
           +-------------------------------------------------------+
   .FBBYV  |      |       |   |        |                           |
           +-------------------------------------------------------+


        Symbol    Bits     DEFSTR      Content

        FB%RET     0-5     FBGNR       Generation retention count
        FB%BSZ     6-11    FBBSZ       Byte size
        FB%MOD    14-17    FBMOD       Last OPENF mode
        FB%PGC    18-38    FBNPG       Page count


            0 1 2 3 4 5 6 7 8    15  17 18                      35
           +------------------------------------------------------+
   .FBBBT  | | | | | | | | | |  |      |                          |
           +------------------------------------------------------+


        Symbol    Bits     DEFSTR      Content

        AR%RAR     1       K0RAR       Request for file to be archived
        AR%RIV     2       K0RIV       System request for migration
        AR%NDL     3       K0NDL       Do not delete disk contents 
                                        after archiving
        AR%NAR     4       K0NAR       Resist migration
        AR%EXM     5       K0EXM       File is exempt from migration
        AR%1ST     6       K01ST       First pass is in progress
        AR%RFL     7       K0RFL       Restore failed
        AR%WRN     8                   User warned of file expiration
        AR%RSN   15-17     K0RSN       Reason file pushed off-line:
                                        1 = .AREXP  File expired
                                        2 = .ARARR  Archive requested
                                        3 = .ARRIR  Migration requested
        AR%PSZ   18-35     ARPSZ       Number of pages in file when 
                                        removed from disk



                                    136
                               MONITOR TABLES
                                FDB (Cont.)


   FBBK0 is used by DUMPER as follows:

            0 1                     17 18                        35
           +-------------------------------------------------------+
   .FBBK0  | |                        |                            |
           +-------------------------------------------------------+


             Bits          Contents

              0            Indicator for interrupted incremental save
             1-17          Count of incremental saves since last time
                            write count changed
            18-35          Write count at last incremental save

                                    NOTE

           For additional information on the FDB see the  Monitor
           Call's Reference Manual.

































                                    137
                               MONITOR TABLES


                              FE-STORAGE-AREA

   Front End Storage Area.  Each entry is  FEN  words  long  (except  the
   lock--FELOCK), where FEN equals the number of front end devices.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+  / \
   FEUDB0: |         | FEFEM           |  FEFRK                    | * |
           \  Flags  |     FE Alloc    |    Fork # Owning Device   \  FEN
           +-------------------------------------------------------+  \ /
   FEUDB1: |  FEICT          |                  |  FEFEI           |  / \
           |  Current Input  |      unused      | Bytes Now in FE  |  FEN
           \   Byte Count    |                  |                  \  \ /
           |-------------------------------------------------------|  / \
   FEUDB5: |                                                       | * |
           \                   Byte information                    \  FEN
           |-------------------------------------------------------|  \ /
   FEUDB6: |                                                       |  / \
           \                 Output output pointer                 \  FEN
           |-------------------------------------------------------|  \ /
   FEUDB7: |0              11|12              23|24              35|  / \
           | FEIE1           | FEOEB            | FEIEB            |  FEN
           |Bytes remain. for|Bytes remain. for |Bytes remain. for |   |
           \   input level   |output int. level | input int. level \  \ /
           |-------------------------------------------------------|
           |0              17|18              23|24              35|  / \
           |  FEIBF          | FEBSZ            | FEOCT            | 
           |  Buffer Address | Byte Size        | Output           |  FEN
           \                 | of Opening       | Count            \  \ /
           |-------------------------------------------------------|  / \
   FEUDB4: |                                                       |  FEN
           \                  Input Input Pointer                  \  \ /
           |-------------------------------------------------------|
   FELOCK: |             Front end storage area lock               |
           +-------------------------------------------------------+















                                    138
                               MONITOR TABLES
                          FE-STORAGE-AREA (Cont.)


            0 1 2 3 4 5 6            17 18                       35
           +-------------------------------------------------------+
   FEUDB0  | |   | | | |     FEFEM     |           FEFRK           |
   entry   +-------------------------------------------------------+


             Bit(s)    Pointer   Content

               0       FEACT     Output active bit
             1-2       FEDTE     DTE owning this device
               3       FEBLK     Unit is blocked
               4       FEEOF     Input EOF declared by FE
               5       FEVDT     FE assignment is valid
             6-17      FEFEM     FE Allocation
            18-35      FEFRK     Fork   owning device


            0 1            11 12              23 24              35
           +-------------------------------------------------------+
   FEUDB5  | |     FEPRO     |      FEIBC       |      FEOE1       |
   entry   +-------------------------------------------------------+


             Bit(s)    Pointer   Content

               0       FEHNG     Hung bit
             1-11      FEPRO     Count of input since last ack
            12-23      FEIBC     Count of bytes in interrupt buffer
            24-35      FEOE1     Bytes remaining for output level























                                    139
                               MONITOR TABLES


                                  FKBSPW

   This resident table contains pointers that comprise a linked  list  of
   the  current balance set members.  The initial pointer to this list is
   BSLST.  The list is used by AJBALS to  determine  the  status  of  the
   current  members of the balance set.  Note that an entry may contain a
   non-zero value without being a balance set member.  Only entries found
   by  following  the  BSLST link are considered.  If a fork is placed on
   the balance set without hold time, it does not appear on this list.

   Defined in:  STG

   Index:  Fork number

                                   Format


           +------------------------------------------------------------+
   FKBSPW: | FKGOLN                    | FKBLP Balance set list pointer | / \
           +------------------------------------------------------------+  |
           |                           .                                |  |
           |                           .                                | NFKS
           \                           .                                \  |
           |                           .                                |  |
           |                           .                                | \ /
           +------------------------------------------------------------+


   When the fork is blocked, FKGOLN contains the  block  priority,  which
   may be one of the following:

             FHV1 = 1
                .
                .
                .
             FHV7 = 7

   When the fork is runnable, FKGOLN contains the GOLST position.















                                    140
                               MONITOR TABLES


                                   FKCNO

   Fork Core Number Table.  The left half of this table is used  to  hold
   the  SPT  index  for  the  second page of each fork's PSB table.  (see
   FKPGS table for SPT index for first page of each fork's PSB).

   Defined in:  STG, PROLOG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+
|  FKCNO:  | FKPS2                     | FKJPT                     |  / \
|          | SPTn for 2nd pg of PSB    | Page table for extended   |   |
|          |                           | JSB (currently unused)    |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+























                                    141
                               MONITOR TABLES


                                   FKINT

   Fork  Interrupt  Table.   This  table  contains  the  pseudo-interrupt
   communication  register  for  each  fork.  The left half of each entry
   contains bits recording the type of request.  The  symbols  for  these
   requests have right half bit assignments (that is, bits 20-35) but are
   tested against the left half of the table.

   Defined in:  STG

   Index:  Fork number

                                   Format

            0                         18 19         26 27        35
           +-------------------------------------------------------+
   FKINT:  |           Bits             |   Unused    |   TRMCOD   |* / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        FKPSI0      0                  Interrupt Request(s) pending
        FKPSI1      1                  Fork not interruptable
        NEWFK%      2                  Initiate new fork
        NEWJB%      3                  Initiate new job
        PSIIF%      4                  Channel interrupt requested in FKINTB
        PSIT1%      5                  Terminal code Interrupt, Phase 1
        PSIT2%      6                  Terminal code Interrupt, Phase 2
        SUSFK%      7                  Suspend fork request
        PSIWT%      8                  Job was in wait state
        PSILO%      9                  Logout job request
        FRZB1%     10                  Direct freeze has been done
        FRZB2%     11                  Indirect freeze has been done
        FRZBB%==FRZB1%+FRZB2%          Both bits for external references
        JTFRZ%     12                  JSYS trap freeze
        ABFRZ%     13                  Address break freeze
        FRZBA%==ABFRZ%+JTFRZ%+FRZBB%   All types of freezes
        PSICO%     14                  Carrier off action request




                                    142
                               MONITOR TABLES
                               FKINT (Cont.)


        PSITL%     15                  Time limit exceeded interrupt
        PSIJT%     16                  JSYS trap request
        ADRBK%     17                  Address break request
        PSIPRI     18                  Priority word set
        PSIDP%     19                  DAP% JSYS Attention
        PSISC%     20                  SCS% JSYS work queue entries 
                                        for this fork
        UNUSED    21-26                Unused
                  27-35    TRMCOD      Field for terminal











































                                    143
                               MONITOR TABLES


                                  FKINTB

   Fork  Interrupt  Table.   This  table  contains  the  pseudo-interrupt
   channel  requests  pending  for  each  fork  since the fork's last PSI
   interrupt.

   Defined in:  STG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+
   FKINTB: |           Interrupt Channel Request(s)  Pending       |  / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+





















                                    144
                               MONITOR TABLES


                                   FKJOB

   Fork Job Table.  This table holds  each  fork's  job  number  and  JSB
   address (SPT index).

   Defined in:  STG

   Index:  Fork number


                                   Format

           +-------------------------------------------------------+
           |  FKJBN                    |  FKJSB                    |  / \
   FKJOB:  |        Job Number         |      JSB (SPT Index)      |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |  
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+





















                                    145
                               MONITOR TABLES


                                   FKJTQ

   Fork JSYS Trap Queue.  This doubly linked list is a JSYS  Traps  Queue
   of  forks  waiting  to  program  software interrupt (PSI) the monitor.
   JTLST points to the top fork on the linked JSYS traps queue in FKJTQ.

   When a fork tries JTLOCK (in the JSB) and  some  other  fork  has  the
   lock,  the  fork  is  added  to  FKJTQ  and blocked.  When the lock is
   cleared, the queue is scanned for the first fork (if any)  waiting  on
   the lock.  That fork is removed from the queue and allowed to run.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
           |  FKJTP                    |    FKJTN                  |
   FKJTQ:  |  Ptr. to Previous Entry   |    Ptr. to Next Entry     |  / \
           |-------------------------------------------------------|   | 
           |                                                       |   |
           |                                                       |   |
           |                                                       |
           |                                                       | NFKS
           |                                                       |
           |                                                       |   |
           \                                                       \  \ /
           +-------------------------------------------------------+


























                                    146
                               MONITOR TABLES


                                   FKNBW

   This resident table saves the time of start of a balance set wait of a
   fork.

   Defined in:  STG

   Index:  Fork number


                                   Format

           +-------------------------------------------------------+
   FKNBW:  |             Time of start of BALSET wait              | / \
           +-------------------------------------------------------+  |
           |                           .                           |  |
           |                           .                           | NFKS
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \ \ /
           +-------------------------------------------------------+
































                                    147
                               MONITOR TABLES


                                   FKNR

   Fork Number of Reserve Pages Table.  This table contains in the  right
   half  the  current  reserve  working set size for each fork.  Also, it
   contains the age stamp value at the last time local garbage collection
   (removal of less frequently used pages) took place for the fork.

   Defined in:  STG

   Index:  Fork number

                                   Format

            0           8 9          17 18                       35
           +-------------------------------------------------------+
           |  FKXAGE     |  FKAGE *    |  FKWSS                    |  / \
   FKNR:   |Age -Last XGC| Current Age | Reserve Working Set Size  |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+


   * FKAGE was used prior to Release 4.   It  is  currently  set  to  100
   (octal) and not changed.




















                                    148
                               MONITOR TABLES


                                   FKPGS

   Fork Page and Process Storage Table.  This  table  contains  the  page
   table and PSB locations (SPT indexes) for each fork.

   Defined in:  STG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+
           |  FKUPT                    |  FKPSB                    |  / \
   FKPGS:  |  Page Table (SPT Index)   |      PSB (SPT Index) *    |   |
           |                           |   for 1st page of PSB     |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+


   * See FKCNO table description for SPT index for second page of PSB.


















                                    149
                               MONITOR TABLES


                                  FKPGST

   Fork BALSET Wait Satisfied Test Table.  This table holds test  routine
   information  for  forks in a balance set wait state.  The test routine
   checks if wait satisfied has occurred.

   For forks on a wait list (and therefore not in the balance set),  this
   table contains the time of day the fork entered the list.

   Defined in:  STG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+  / \
           | FKPTD                     | FKPTR                     |   |
           |                           |     Test Routine for      |   |
   FKPGST: |         Test Data         |   BALSET Wait Satisfied   |   |
           |-------------------------------------------------------|   |
           |                          or                           |   |
           |-------------------------------------------------------|   |
           |            Time of Day Entered a Wait List            |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+












                                    150
                               MONITOR TABLES


                                   FKPT

   Fork List Pointer Table.  This table gives the chain of forks for each
   list  of  forks  in  the system.  That is, it holds the linked list of
   forks on TTILST, CLKLST, GOLST.  A  fork  is  either  on  one  of  the
   wait-lists  or  the go-list.  The right half contains the list pointer
   to the next fork on the same list.  The left half contains the runtime
   at  which  the process associated with the particular fork runs out of
   balance set hold time.

   Defined in:  STG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+
           | FKBET                     |                           |  / \
   FKPT:   |   Time balance set hold   |       List Pointer        |   |
           |          elapses          |                           |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+

   Unused slots in this table are linked in a free list.  Location  FREFK
   contains a pointer to the first slot in the free list.



















                                    151
                               MONITOR TABLES


                                   FKQ1

   Fork Run Queue Table 1.  This table contains each fork's remaining run
   quantum.   When  this  quantum  expires,  the process is requeued to a
   lower run position and given the the quantum associated with that  run
   queue.

   Defined in:  STG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+
   FKQ1:   |  FKQTM                                                |  / \
           |             Fork's Remaining Run Quantum              |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+























                                    152
                               MONITOR TABLES


                                   FKQ2

   Fork Run Queue Table 2.  This table contains the  queue  level  number
   and  fork location (that is, the list address such as TTILST or GOLST)
   for each fork.

   Defined in:  STG

   Index:  Fork number

                                   Format

            0 1 2   5 6    11 12     17 18                       35
           +-------------------------------------------------------+  / \
   FKQ2:   | | |     |       |         |                           |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                   0       FKNTC       Network topology change 
                                        interrupt enabled
                   1       PIBMP       PI boost flag
                  2-5      FKFLG       Fork flags
                  6-11     FKMNQ       Max Q for fork
                 12-17     FKQN        Queue level number
                 18-35     FKWTL       Wait list address for blocked fork













                                    153
                               MONITOR TABLES


                                  FKSTA2

   This table, indexed by fork number, contains the test data for a given
   fork.   It  is  similar to FKSTAT except that this table can contain a
   full 36-bit test data word.

   Defined in:     STG

   Index:          Fork number


           +-------------------------------------------------------+
           |                          FKST2                        |
           |                        Test Data                      |   / \
           |-------------------------------------------------------|    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |
           |                                                       |  NFKS
           |                                                       |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           \                                                       \    |
           +-------------------------------------------------------+   \ /
























                                    154
                               MONITOR TABLES


                                  FKSTAT

   Fork Status Table.  This table has  useful  information  when  a  fork
   blocks  and  leaves  the  GOLST  (that is, LH (FKPT) contains the list
   address, WTLST).

   The blocked fork's entry in this table contains  the  address  of  the
   test  routine  which,  when  called,  determines if wait satisfied has
   occurred for the fork.

   Defined in:  STG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+  / \
           | FKSTR                     |   FKSTO                   |   |
   FKSTAT: |         Test Data         |   Test Routine Address    |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /



















                                    155
                               MONITOR TABLES


                                   FKSWP

   This resident table contains fork information that is  used  primarily
   by the working set manager in its decisions.

   Defined in:  STG, PROLOG

   Index:  Fork number

                                   Format
           +-------------------------------------------------------+
   FKSWP:  |   flags                   |           FKHST           |* / \
           +-------------------------------------------------------+   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           |  NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+

            0 1 2 3 4 5 6 7 8        17 18                       35
           +-------------------------------------------------------+
           | | | | | | | | |  FKGOLN   |           FKHST           |
           +-------------------------------------------------------+

                  Bits     Pointer     Content

                   0       FKWSL       Working set loaded
                   1       FKBLK       Fork blocked off if on GOLST
                   2       FKIBS       Fork in balance set
                   3       BSWTB       Fork in balance set wait
                   4       BSNSK       NOSKED--on if fork is NOSKED
                                        and not running
                   5       BSCRSK      CRSKED--on if fork is CRSKED
                                        and not running
                   6       FKIBH       In balance set hold--on if fork
                                        entered balance set since last
                                        update to history
                   7       FKBSHF      In balance set hold in AJBALS
                                        algorithm
                   8       BSSPQ       Special queue (system fork)
                   9       BSOVRD      Override high priority
                  10       BSNST       Last block was long
                  11       SCWAK%      SCJSYS is waking
                  12       SCBLK%      SCJSYS is blocked
                  13       FKSPL       Inferior fork has been spliced
                  14       FKKIL       Fork is being killed
                  15       FKOGL       Fork is on GOLST
               16-17                   Unused
               18-35       FKHST       Fork history

                                    156
                               MONITOR TABLES


                                  FKTIME

   Fork Time Table.  This table gives the time of day (TODCLK)  at  which
   each fork was put on its current run queue.

   Defined in:  STG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+
   FKTIME: |            Time When Fork Put on Run Queue            |  / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+

























                                    157
                               MONITOR TABLES


                                   FKWSP

   Fork Working Set (In-Memory Size) Table.  This table contains  in  the
   right  half  the  number  of physical pages currently assigned to each
   fork.  The left half is used to hold the preload size as determined by
   LDJOB when a fork enters the balance set.

   Defined in:  STG

   Index:  Fork number

                                   Format

           +-------------------------------------------------------+
           | FKNWCE                    |  FKCSIZ                   |  / \
   FKWSP:  |  # of pages to be loaded  |       Current Size        |   |
           | (either # of pages of the |                           |   |
           | working set currently not |                           |   |
           | loaded  or  # of overhead |                           |   |
           |  pages if not preloading  |                           |   |
           |        (NFKSPP=4)         |                           |   |
           |-------------------------------------------------------|   |
           |                           .                           |
           |                           .                           | NFKS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+





















                                    158
                               MONITOR TABLES


                                    FL

   FL is the format of the NI Flush Command Queue command.

   Defined in:  PHYKNI

                                            Format                                  

          +------------------------------------------------------------------------+ 
   FLCHK  |                               Check word                               |   
          |------------------------------------------------------------------------| 
   FLPID  |                               Portal ID                                |   
          +------------------------------------------------------------------------+ 








































                                    159
                               MONITOR TABLES


                      FREESPACE BLOCK HEADER/TRAILER

   At a minimum, a header of length 3 is required  (no  trailer  is  ever
   required).  The header is infinitely expandable, as is any trailer.

   While in the pool, blocks are manipulated by pointers that address the
   first  word  past the header (thus the negative offsets for the header
   definitions).  Before a block is assigned to the user, the pointer  is
   SOS'd  and the user area of the block overlays the header by one word.
   (Specifically, the user area of the  block  begins  with  header  word
   FSPNXT.)

   Unless the monitor has been assembled with the debug conditional,  the
   block header is three words long and no trailer is used.

   Defined in:  FREE

                                          Format

               +-------------------------------------------------------------+
   FSPAPC= -7  |                     PC of block assigner                    |
               |-------------------------------------------------------------|
   FSPAJF= -6  |               Job #,,fork # of block assigner               |
               |-------------------------------------------------------------|
   FSPDPC= -5  |                     PC of block deassigner                  |
               |-------------------------------------------------------------|
   FSPDJF= -4  |               Job #,,fork # of block deassigner             |
               |-------------------------------------------------------------|
   FSPFLG= -3  |                      Flags,,unique code                     |
               |-------------------------------------------------------------|
   FSPSIZ= -2  |            Size of block (including header/trailer)         |
               |-------------------------------------------------------------|
   FSPNXT= -1  |                   Pointer to next block                     |
               +-------------------------------------------------------------+



















                                    160
                               MONITOR TABLES


                           FREESPACE DESCRIPTOR

   The free space descriptor is a block that contains  information  about
   the  individual free space pools and pointers to them.  The address of
   each descriptor is contained in the FSPTAB table.

   Defined in:  FREE

                                        Format

              +-------------------------------------------------------------+
   FSPPFL=0   |                        Flags                                |
              |-------------------------------------------------------------|
   FSPLOK=1   |                       Pool lock                             |
              |-------------------------------------------------------------|
   FSPORG=2   |           Origin address of freespace pool                  |
              |-------------------------------------------------------------|
   FSPEND=3   |           Ending address of freespace pool                  |
              |-------------------------------------------------------------|
   FSPCNT=4   |           Count of space remaining in pool                  |
              |-------------------------------------------------------------|
   FSPSML=5   |          Smallest balance of free space achieved            |
              |-------------------------------------------------------------|
   FSPBAP=6   |           Pointer to block-accounting area                  |
              |-------------------------------------------------------------|
   FSPMTB=7   |               Minimum total block size                      |
              |-------------------------------------------------------------|
   FSPFFB=10  |               Pointer to first free block                   |
              |-------------------------------------------------------------|
   FSPRFB=11  |       Randomized pointer to first free block                |
              |-------------------------------------------------------------|
   FSPHDS=12  |                   Block header size                         |
              |-------------------------------------------------------------|
   FSPTRS=13  |                   Block trailer size                        |
              |-------------------------------------------------------------|
   FSPHTS=14  |            Combined header and trailer size                 |
              |-------------------------------------------------------------|
   FSPBCS=15  |            Smaller of header or trailer size                |
              |-------------------------------------------------------------|
   FSPHBP=16  |                     History buffer address                  |
              |-------------------------------------------------------------|
   FSPHBX=17  |    Max History transactions    |  Index to current hist rec |
              +-------------------------------------------------------------+

        FSPDSS = descriptor size in words








                                    161
                               MONITOR TABLES


                     FREESPACE-DESCRIPTOR INDEX TABLE

   This is the table that points  to  the  swappable  and  JSB  freespace
   structures.

   Defined in:  FREE

                                   Format

   FSPTAB: +-------------------------------------------------------------+
           |               Pointer to freespace descriptor               |
           |-------------------------------------------------------------|
           |               Pointer to freespace descriptor               |
           |-------------------------------------------------------------|
           |                               .                             |
           |                               .                             |
           |                               .                             |
           |-------------------------------------------------------------|
           |               Pointer to freespace descriptor               |
           +-------------------------------------------------------------+

           FSPTBL = Freespace-descriptor index-table size in words































                                    162
                               MONITOR TABLES


                         FREESPACE HISTORY RECORD

   The free space history record is a ring buffer that is used to  record
   free space transactions.  There is one ring buffer for each free space
   pool.  Word FSPHBO in the free  space  descriptor  contains  the  base
   address  of  this  buffer.   The right half of word FSPHBX in the free
   space descriptor contains the index to the current history record.

   Defined in:  FREE

                                       Format
             +-------------------------------------------------------------+
   FSPHST=0  |        Transaction Type (-1 = assign; 0 = deassign)         |
             |-------------------------------------------------------------|
   FSPHPC=1  |                     PC of Caller                            |
             |-------------------------------------------------------------|
   FSPHJF=2  |                  Job,, Fork of Caller                       |
             |-------------------------------------------------------------|
   FSPHBA=3  |                     Block Address                           |
             |-------------------------------------------------------------|
   FSPHBS=4  |                      Block Size                             |
             +-------------------------------------------------------------+

   FSPHRC (200 decimal) is the number of history records in  the  history
   buffer.




























                                    163
                               MONITOR TABLES


                                    GB

   The format of the LAT Service Block is  shown  below.   There  is  one
   service  block  for  each  service  provided by the host.  A host must
   provide at least one service if it is to function as a LAT  host.   If
   no  services  have  been  defined by the LCP interface at the time LAT
   operations are started, a default service is  defined  with  the  same
   name as the host node name.

   Defined in:  LATSRV

                                            Format                                  

                                        SERVICE BLOCK                               
          +------------------------------------------------------------------------+ 
   GBRAT  |                             Service Rating                             | 
          |------------------------------------------------------------------------| 
          |               GBNC                |               GBLC                 |
          |  Count of bytes in service name   |     Count of bytes in service      |
          |                                   |            description             |
          |------------------------------------------------------------------------|       /\       
   GBNAM  |               Storage for up to 16 bytes of service name               | <<ML.SNM+4>/5> 
          \                                                                        \       \/       
          |------------------------------------------------------------------------|       /\       
   GBHID  |                Storage for up to 64 bytes of service id                | <<ML.SID+4>/5> 
          \                                                                        \       \/       
          +------------------------------------------------------------------------+ 


























                                    164
                               MONITOR TABLES


                                  GTOKPR

   This table is used by the access control code.  It contains one  entry
   for each legal GETOK/GIVOK function.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   GTOKPR: |                DGOUSR -- User requests                | / \
           |-------------------------------------------------------|  |
           |                DGOASD -- Assign device                |  |
           |-------------------------------------------------------|  |
           |         DGOCAP -- Enable/disable capabilities         |  |
           |-------------------------------------------------------|  |
           |                 DGOCJB -- Create job                  |  |
           |-------------------------------------------------------|  |
           |                    DGOLOG -- Login                    |  |
           |-------------------------------------------------------|  |
           |                 DGOCFK -- Create fork                 |  |
           |-------------------------------------------------------|  |
           |           DGOTBR -- Set terminal baud rate            |  |
           |-------------------------------------------------------|  |
           |                   DGOLGO -- Logout                    |  |
           |-------------------------------------------------------|
           |              DGOENQ -- ENQ quota setting              | MXGOKF
           |-------------------------------------------------------|
           |           DGOCRD -- Create/modify directory           |  |
           |-------------------------------------------------------|  |
           |               DGOSMT -- Structure mount               |  |
           |-------------------------------------------------------|  |
           |                 DGOMDD -- Enter MDDT                  |  |
           |-------------------------------------------------------|  |
           |              DGOCLS -- Set class for job              |  |
           |-------------------------------------------------------|  |
           |             DGOCL0 -- Set class at login              |  |
           |-------------------------------------------------------|  |
           |                  DGOMTA -- MT access                  |  |
           |-------------------------------------------------------|  |
           |                 DGOACC -- ACESS JSYS                  |  |
           |-------------------------------------------------------|  |
           |           DGOOAD -- Assign device via OPENF           |  |
           |-------------------------------------------------------|  |
           |                DGODNA -- DECnet access                |  |
           |-------------------------------------------------------|  |
           |               DGOANA -- ARPAnet access                |  |






                                    165
                               MONITOR TABLES
                               GTOKPR (Cont.)


           |-------------------------------------------------------|  |
           |                 DGOATJ -- Attach job                  |  | 
|          |-------------------------------------------------------|  |
|          |               DGOINF -- INFO% monitor call            |  |
|          |-------------------------------------------------------|  |
|          |               DGOLAT -- LATOP% monitor call           |  | 
|          |-------------------------------------------------------|  |
|          |           DGOCTM -- Incoming CTERM connections        |  |
|          |-------------------------------------------------------|  |
|          |                  DGOTTM -- Allow TTMSG%               |  |
|          |-------------------------------------------------------|  |
|          |                  DGOSMN -- Allow SMON%                |  |
|          |-------------------------------------------------------|  |
|          |                  DGOMSY -- Allow HSYS%                |  |
|          |-------------------------------------------------------|  |
|          |                  DGOSGT -- Allow SYSGT%               |  |
|          |-------------------------------------------------------|  |
|          |                  DGOGTB -- Allow GETAB%               |  |
|          |-------------------------------------------------------|  |
|          |            DGOOPN -- OPENF% of secure file            |  |
|          |-------------------------------------------------------|  |
|          |            DGORNF -- RNAMF% of secure file            |  |
|          |-------------------------------------------------------|  |
|          |            DGODLF -- DELF%/DELNF% of secure file      |  |
|          |-------------------------------------------------------|  |
|          |                  DGOTLK -- Allow TLINK%               |  |
|          |-------------------------------------------------------|  |
|          |      DGOCRL -- Allow CRLNM% (only some functions)     |  |
|          |-------------------------------------------------------|  |
|          |                  DGODTC -- Allow DTACH%               |  |
|          |-------------------------------------------------------|
|          |       DGOCFD -- Allow CHFDB% to set file secure       | \ /
           +-------------------------------------------------------+



















                                    166
                               MONITOR TABLES


                                    HC

   Data structure HC is the LAT circuit counters portion of the Host Node
   (HN) data structure.

   Defined in:  LATSRV

                                            Format                                  

          +------------------------------------------------------------------------+ 
   HCRCV  |                           Messages received                            |      
          |------------------------------------------------------------------------| 
   HCXMT  |                          Messages transmitted                          |      
          |------------------------------------------------------------------------| 
   HCRTR  |                         Messages retransmitted                         |      
          |------------------------------------------------------------------------| 
   HCSEQ  |                    Receive message sequence errors                     |      
          |------------------------------------------------------------------------| 
   HCIMR  |                       Illegal messages received                        |      
          |------------------------------------------------------------------------| 
   HCISR  |                         Illegal slots received                         |      
          |------------------------------------------------------------------------| 
   HCRES  |                            Resource errors                             |      
          |------------------------------------------------------------------------| 
   HCMSK  |                       Illegal message error mask                       |      
          +------------------------------------------------------------------------+ 



























                                    167
                               MONITOR TABLES


                                    HN

   The HN (Host Node) data structure is used  by  LAT  service  to  store
   status  and  configuration  information  describing  the  local  host.
   TOPS-20 stores the address of this block in location LAHNDB.

   Defined in:  LATSRV

                                            Format                           

                                     HOST NODE Data Base
        +------------------------------------------------------------------------+ 
        | | | |                             |                   | | | | | | | |  |
        |               HNFLG               |                   |     HNCFL      | *
        |------------------------------------------------------------------------| 
        |               HNMXC               |               HNNCC                |
        |Maximum allocatable circuit blocks |   Number of currently allocated    |
        |                                   |          circuit blocks            |
        |------------------------------------------------------------------------| 
        |               HNMAC               |               HNNAC                |
        | Maximum number of active circuits |Number of currently active circuits |
        |------------------------------------------------------------------------| 
        |               HNMCO               |               HNCON                |
        |  Maximum number of simultaneous   | Current number of active connects  |
        |             connects              |                                    |
        |------------------------------------------------------------------------| 
        |               HNNUM               |               HNLAS                |
        |            Host number            |         LAT access state           |
        |------------------------------------------------------------------------| 
        |               HNRLI               |               HNTIM                |
        |Virtual circuit message retransmit |   Virtual circuit timer initial    |
        |               limit               |            value (ms)              |
        |------------------------------------------------------------------------| 
        |               HNMTI               |               HNRAT                |
        |Multicast timer initial value (sec)|     Host node dynamic rating       |
        |------------------------------------------------------------------------| 
        |               HNPRG               |               HNNRB                |
        |        Host progress timer        |Number of receive buffers allocated |
|       |------------------------------------------------------------------------|
|       |               HNCMT               |              HNCMX                 |
|       |    Command message retry timer    |    Command message retry limit     |
        |------------------------------------------------------------------------| 
   HNHST|                         Address of state table                         |                
        |------------------------------------------------------------------------| /\
   HNQAC|                 Queue header for active circuit blocks                 | 2 
        \                                                                        \ \/
        |------------------------------------------------------------------------| /\
   HNQIC|                Queue header for inactive circuit blocks                | 2 
        \                                                                        \ \/




                                    168
                               MONITOR TABLES
                                 HN (Cont.)


        |------------------------------------------------------------------------| /\
   HNNIQ|                     Interrupt level message queue                      | 2 
        \                                                                        \ \/
        |------------------------------------------------------------------------| /\
   HNSCQ|                     Scheduler level message queue                      | 2 
        \                                                                        \ \/
        |------------------------------------------------------------------------| 
   HNPID|                              NI Portal ID                              |   
        |------------------------------------------------------------------------| 
        |               HNNXI               |               HNNSV                |
        |Next circuit block index to assign |    Number of offered services      |
        |------------------------------------------------------------------------| 
   HNLOK|                         Lock for HN data base                          |   
        |------------------------------------------------------------------------| 
        |               HNNMC               |               HNIDC                |
        |       Host node name count        | Host identification string count   |
        |------------------------------------------------------------------------| /\
   HNNAM|                         Host node name string                          | 2 
        \                                                                        \ \/
        |------------------------------------------------------------------------|       /\       
   HNID |                       Host identification string                       | <<ML.DSC+4>/5> 
        \                                                                        \       \/       
        |------------------------------------------------------------------------|       /\ 
   HNSMT|                        Start message template                          | <<<ML.HSM+3>/4>
        |                                                                        |     +SBF.OF> 
        \                                                                        \       \/           
        |------------------------------------------------------------------------|       /\       
   HNMCM|                     Copy of the multicast message                      | <<ML.HMC+3>/4> 
        \                                                                        \       \/       
        |------------------------------------------------------------------------|        /\       
   HNSRV|                       Storage for service blocks                       | <GB.LEN*MXHSRV> 
        \                                                                        \        \/       
        +------------------------------------------------------------------------+ 

           For field HNFLG(0-17):
                   HNRUN      0    NI run state
                   HNANY      1    Reconstruct of START message necessary
                   HNCIP      2    Virtual circuit connect in progress

           For field HNCFL(28-35):
                   HNOTH      28   Something other than above changed
                   HNFIL      29 
                   HNCLS      30   A host service class changed
                   HNSVD      31   A host service description changed
                   HNSVR      32   A host service rating changed
                   HNSVN      33   A host service name changed
                   HNNDD      34   Host Node Description changed
                   HNACS      35   Access Codes changed




                                    169
                               MONITOR TABLES


                                    HOM

   Home Block.  Block on each disk unit which contains  vital  statistics
   that  cannot  be  built  in  when  a  monitor is generated.  These are
   primarily parameters of the unit and the STR to which it belongs.

   Defined in:  DSKALC

                                   Format

             +-------------------------------------------------------+
   HOMNAM=0  |                      SIXBIT/HOM/                      |
             |-------------------------------------------------------|
   HOMID=1   |                    SIXBIT/Unit ID/                    |
             |-------------------------------------------------------|
             |   Physical Disk Address   |   Physical Disk Address   |
   HOMPHY=2  |    of This Home Block     |    of Other Home Block    |
             |-------------------------------------------------------|
   HOMSNM=3  |                SIXBIT/Structure Name/                 |
             |-------------------------------------------------------|
   HOMLUN=4  |     # of Packs in STR     | Logical Pack # Within STR |
             |-------------------------------------------------------|
             |        Block # of         |        Block # of         |
   HOMHOM=5  |      This Home Block      |     Other Home Block      |
             |-------------------------------------------------------|
   HOMP4S=6  |       # of Pages for Swapping on This Structure       |
             |-------------------------------------------------------|
   HOMFST=7  |             First Swapping Track on Unit              |
             |-------------------------------------------------------|
   HOMRXB=10 |       Address of Index Block of ROOT-DIRECTORY        |
             |-------------------------------------------------------|
             |               Address of Index Block of               |
   HOMBXB=11 |             BACKUP-COPY-OF-ROOT-DIRECTORY             |
             |-------------------------------------------------------|
   HOMFLG=12 |                         Flags                         |
             |-------------------------------------------------------|
   HOMSIZ=13 |            Number of Sectors in This Unit             |
             |-------------------------------------------------------|
   HOMBTB=14 |             Number of Tracks in Structure             |
             |-------------------------------------------------------|
   HOMMID=15 |                   Pack Unique Code                    |
             |-------------------------------------------------------|
             |                                                       |
             \                    Reserved for Expansion             \
             |                                                       |
             |                                                       |
             |-------------------------------------------------------|
   HOMFE0=61 |           Front End File System (sector #)            |
             |-------------------------------------------------------|
   HOMFE1=62 |         Front End File System (# of sectors)          |



                                    170
                               MONITOR TABLES
                                HOM (Cont.)


             |-------------------------------------------------------|
             |                                                       |
             |                                                       |
             \                Reserved for the Front End             \
             |                                                       |
             |                                                       |
             |-------------------------------------------------------|
   HOMFE2=101|        BOOTSTRAP.BIN Word One (Sector #)              |
             |-------------------------------------------------------|
   HOMFE3=102|        BOOTSTRAP.BIN Word Two (# of Sectors)          |
             |-------------------------------------------------------|
             |                                                       |
             \                Reserved for Expansion                 \
             |                                                       |
             |                                                       |
|            |-------------------------------------------------------|
|  HOMLS1=160|     CPU Serial Number     |     CPU Serial Number     |
|            |-------------------------------------------------------|
|  HOMLS2=161|     CPU Serial Number     |     CPU Serial Number     |
|            |-------------------------------------------------------|
|  HOMLS3=162|     CPU Serial Number     |     CPU Serial Number     |
|            |-------------------------------------------------------|
|  HOMLS4=163|     CPU Serial Number     |     CPU Serial Number     |
|            |-------------------------------------------------------|
   HOMSER=164|    APR Serial # of CPU booked from this structure     |
             |-------------------------------------------------------|
   HOMUID=165\    12 Character Unit I.D. (PDP-11 Format) (3 words)   \
             |-------------------------------------------------------|
   HOMOID=170\    12 Character Owner I.D. (PDP-11 Format) (3 words)  \
             |-------------------------------------------------------|
   HOMFSN=173\ 12 Character File System Name (PDP-11 Format)(3 words)\
             |-------------------------------------------------------|
   HOMCOD=176|             0             |      CODHOM  (707070)     |
             |-------------------------------------------------------|
   HOMSLF=177|             0             |       This Block #        |
             +-------------------------------------------------------+
















                                    171
                               MONITOR TABLES
                                HOM (Cont.)



   PDB Format
           
             +-------------------------------------------------------+
             |                  High Serial Number                   |
             |-------------------------------------------------------|
             |                  Low Serial Number                    |
             |-------------------------------------------------------|
             |           Non CI Processor Serial Number              |
             |-------------------------------------------------------|
           0 |   CI Processor Serial #  |        CI State            |
             |-------------------------------------------------------|
             |                          |                            |
             |                          |                            |
             |                          |                            |
             |                          |                            |
          17 |                          |                            |
             +-------------------------------------------------------+ 


































                                    172
                               MONITOR TABLES


                                   HOME

   Home Table.  This table contains the disk pages for the HOME  and  BAT
   blocks and the 11 Bootstrap program.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   HOME:   |                    0 (11 Bootstrap)                   |  |
           |-------------------------------------------------------|  |
           |                    1 (Home Block )                    |  |
           |-------------------------------------------------------|  |
           |                    2 ( BAT Block )                    |  |
           |-------------------------------------------------------|  |
           |                    3  (PDB Block)                     |  |
           |-------------------------------------------------------|  |
           |                    4      .                           |  |
           |-------------------------------------------------------|  |
           |                    5      .                           | 
           |-------------------------------------------------------| NHOME
           |                    6      .                           |
           |-------------------------------------------------------|  |
           |                    7      .                           |  |
           |-------------------------------------------------------|  |
           |                   10      .                           |  |
           |-------------------------------------------------------|  |
           |                   11      .                           |  |
           |-------------------------------------------------------|  |
           |                   12 (Secondary Home Block)           |  |
           |-------------------------------------------------------|  |
           |                   13 (Secondary Bat Block)            |  |
           +-------------------------------------------------------+ \ /



















                                    173
                               MONITOR TABLES


                                  HOMTAB

   This table contains the logical to physical mapping (channel and unit)
   per logical unit, and its length equals the maximum number of packs in
   a structure.

   Defined in:  STG

                                   Format

           +--------------------------------------------------------+
   HOMTAB: |    Physical Channel       |        Physical Unit       |  / \
           |--------------------------------------------------------|   |
           |                           .                            |   |
           |                           .                            |   |
           |                           .                            |   |
           |                           .                            |
           |                           .                            |  HOMTBL
           |                           .                            |
           |                           .                            |   |
           |                           .                            |   |
           |                           .                            |   |
           |                           .                            |   |
           \                           .                            \   |
           +--------------------------------------------------------+  \ /




























                                    174
                               MONITOR TABLES


                                    IA

   This structure is used by DECnet.  The Connect  Initiate  and  Connect
   Confirm  calls'  argument  format for T2.  T1 holds the NSPpid for the
   new logical link.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          |               IAFLO               |               IASIZ                |
          |         Flow control type         |  Max bytes allowed in a message    |
          |                                   |              segment               |
          +------------------------------------------------------------------------+ 






































                                    175
                               MONITOR TABLES


                                    IB

   The  initialization  block  is   the   argument   to   all   DECnet-36
   initialization  routines.   It  is  set with NODE% jsys functions, and
   read by the various DECnet layers during and after initialization.

   Defined in:  D36PAR

                                            Format                                  

                                     Initialization Block                           
          +------------------------------------------------------------------------+ 
        * | | | IBRTR |   |                                                        |
          | | |       |   |                                                        |
          |------------------------------------------------------------------------| 
   IBNAM  |                     Executor node name (in sixbit)                     | 
          |------------------------------------------------------------------------| 
   IBADR  |                 Executor node address (16-bit address)                 | 
          |------------------------------------------------------------------------| 
   IBMXA  |                            Maximum address                             | 
          |------------------------------------------------------------------------| 
   IBMXB  |                            Maximum buffers                             | 
          |------------------------------------------------------------------------| 
   IBDGL  |                              Default goal                              | 
          |------------------------------------------------------------------------| 
   IBDBL  |                     Default # of buffers per link                      | 
          |------------------------------------------------------------------------| 
   IBBIP  |                        Buffer input percentage                         | 
          |------------------------------------------------------------------------| 
   IBBSZ  |                              Buffer size                               | 
          +------------------------------------------------------------------------+ 

           Field IBPH2     (0-0)   Set if Phase II desired
           Field IBRTR     (2-5)   Routing type
                  .RNT.L1          Level-1 router
                  .RNT.NR          End node
           Field IBFCM     (6-7)   Default flow control
















                                    176
                               MONITOR TABLES


                                  IDXFIL

   The Index Table File of the structure currently mapped for a  process.
   Each  structure  has  an  index table file.  The file is indexed by 2*
   directory number as each entry is two words long.  For each  directory
   on  the  structure,  an  entry contains the address of the FDB for the
   directory and the disk address of the index block for the directory.

   The table, IDXFIL, in the PSB, is mapped from the index block  of  the
   file,  STRNAM:<ROOT-DIRECTORY>INDEX-TABLE.BIN.  The file pointed to by
   the IDXFIL map has the format shown below.

   When a structure is mounted (physically) the system gets  an  OFN  for
   this  file  and  stores it in entry, STRIDX, in the SDB table for that
   structure.  The table entries are created at this time (mount-time).

   Defined in:  PROLOG

                                   Format

           +-------------------------------------------------------+
           |                                                       | / \
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \
           |-------------------------------------------------------| Dir. #
           |IDXSD                      |IDXFDB                     |    *2
           |    Superior directory     |    Address of FDB for     |
           |                           |      this directory       |  |
           |-------------------------------------------------------|  |
           | IDXFG | IDXIB                                         |  |
           | flags |   Disk address of index block of directory    |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \ \ /
           +-------------------------------------------------------+















                                    177
                               MONITOR TABLES
                               IDXFIL (Cont.)


            0    4 5 6                                           35
   Word 2  +-------------------------------------------------------+
   of pair |      | |                    IDXIB                     |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Meaning

        IDX%IV     5                   If set, indicates that this
                                        IDX entry is invalid. 
                                        (IDX%IV is set equal to 1,
                                        but is positioned at bit 5)
                  6-35     IDXIB       Disk address of index block
                                        of directory.






































                                    178
                               MONITOR TABLES


                                    IM

   This is the DECnet LLMOP identify-self message block.

   Defined in:  LLMOP

                                            Format                                  

          +------------------------------------------------------------------------+ 
   IMIDD  |                            Special ID word                             |        
          |------------------------------------------------------------------------|   /\   
   IMMSD  |                       MSD for System ID message                        | MD.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|       /\       
   IMDAT  |                           Buffer for message                           | <<SID.SZ+3>/4> 
          \                                                                        \       \/       
          +------------------------------------------------------------------------+ 




































                                    179
                               MONITOR TABLES


                                   INDEX

   The Index Block (1 page)  exists  for  each  disk  file  and  contains
   pointers  to  where each of the file's pages resides on disk.  If more
   than one index block is needed for non-directory files, a super  index
   block  (1  page)  is  created which points to the home disk address of
   each index block.  (Note that the maximum file size is 512*512 pages.)

   When the file is referenced, an in-core copy of  the  index  block  is
   maintained which keeps track of the file's active pages in the system.
   (That is, whether the pages are in-core, on the swapping area,  or  on
   disk.)

                                   Format

           +-------------------------------------------------------+
           |0         8|                                           |
           | C         |              Storage address              |
           |  H        |                                           |
           |-------------------------------------------------------|
           |0   E     8|                                           |
           |     C     |              Storage address              |
           |      K    |                                           |
           |-------------------------------------------------------|
           |0         8|                                           |
           |      S    |              Storage address              |
           |       U   |                                           |
           |-------------------------------------------------------|
           |0       M 8|                                           |
           |           |              Storage address              |
           |           |                                           |
           |-------------------------------------------------------|
           |           |                                           |
           |           |              Storage address              |
           |           |                                           |
           |-------------------------------------------------------|
           |                           .                           |
           |                           .                           |
           |                           .                           |
           \                           .                           \
           +-------------------------------------------------------+












                                    180
                               MONITOR TABLES


                                  INIDEV

   Initialization  Device  Routines.   This  table  contains   calls   to
   initialize devices after loading the swappable monitor.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   INIDEV: |                     CALL MTAINI                       |
           |-------------------------------------------------------|
           |               CALL LPTINI (2020 only)                 |
           |-------------------------------------------------------|
           |                CALL CDPINI (KL only)                  |
           |-------------------------------------------------------|
           |                          RET                          |
           +-------------------------------------------------------+



































                                    181
                               MONITOR TABLES


                                  INIDV1

   Front End Initialization Device Routines.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   INIDV1: |                   CALL FEINI (KL only)                |
           |-------------------------------------------------------|
           |                      CALL CDRINI                      |
           |-------------------------------------------------------|
           |                  CALL LPTINI (KL only)                |
           |-------------------------------------------------------|
           |                          RET                          |
           +-------------------------------------------------------+




































                                    182
                               MONITOR TABLES


                                  INIDVT

   Device Initialization Table.  This static table generated at  assembly
   time,  contains  a  four  word  block  for  each type of device on the
   system.  It is used at system startup time to generate unit number  of
   entries  per device type in the device tables, DEVCHR, DEVCH1, DEVNAM,
   and DEVUNT.  Thus, each unit of each device type has an entry  in  the
   device tables.

   Defined in:  STG, MONSYM

                                   Format

           +-------------------------------------------------------+ / \
   INIDVT: |                       SIXBIT/Name/                    |  |
           |-------------------------------------------------------|  |
           | Device Type Index Number  |     Dispatch Adr.         |  
           |-------------------------------------------------------|  4
           |      Char1|   <TYPE>B17   |          Modes            |* 
           |-------------------------------------------------------|  |
           |            CHAR2 + CHAR3 + Number of Units            |  |
           |-------------------------------------------------------| \ /
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           |                           .                           |
           \                           .                           \
           +-------------------------------------------------------+


        CHAR1 can be a combination of the following:

                  Symbol   Bit         Meaning

                  DV%OUT    0          Can do output
                  DV%IN     1          Can do input
                  DV%DIR    2          Has a directory
                  DV%AS     3          Is assignable
                  DV%MDD    4          Is a multiple directory device
                  DV%AV *   5          Is available to this job
                  DV%ASN *  6          Is assigned by ASND
                  DV%MDV    7          Is a mountable device
                  DV%MNT *  8          Is mounted








                                    183
                               MONITOR TABLES
                               INIDVT (Cont.)


        TYPE is one of the following:

                  Symbol   Value       Meaning

                  .DVDSK     0         Disk
                  .DVMTA     2         Magtape
                  .DVPTP     5         Spooled PTP
                  .DVLPT     7         Spooled & physical line printer
                  .DVCDR    10         Spooled & physical card reader
                  .DVFE     11         Front End Device
                  .DVTTY    12         Terminal
                  .DVPTY    13         Pseudo TTY
                  .DVNUL    15         Null Device
                  .DVNET    16         ARPA network
                  .DVPLT    17         Spooled Plotter
                  .DVCDP    21         Spooled Card Punch
                  .DVTCP    25         TCP Device


        MODES can be a combination of the following:

                  Symbol   Bit         Meaning

                  DV%M0    35          Can be opened in mode 0
                  DV%M1    34                  "             1
                  DV%M2    33                  "             2
                  DV%M3    32                  "             3
                  DV%M4    31                  "             4
                  DV%M5    30                  "             5
                  DV%M6    29                  "             6
                  DV%M7    28                  "             7
                  DV%M10   27                  "            10
                  DV%M11   26                  "            11
                  DV%M12   25                  "            12
                  DV%M13   24                  "            13
                  DV%M14   23                  "            14
                  DV%M15   22                  "            15
                  DV%M16   21                  "            16
                  DV%M17   20                  "            17













                                    184
                               MONITOR TABLES
                               INIDVT (Cont.)


        CHAR2 can be a combination of the following:

                  Symbol   Bit         Meaning

                  D1%SPL    0          Is spooled
                  D1%ALC *  1          Is under control of allocator
                  D1%VVL *  2          Volume valid
                  D1%NIU *  3          Device slot not in use
                  D1%INI *  4          Device is being initialized
                                         (currently for structures only)
                  D1%MTU    5          Device can do MTOPR without
                                        JFN opened


                  * These bits are zero at assembly time and are set
                     by the monitor when appropriate in their corres-
                     ponding device tables.  (DEVCHR or DEVCH1)

   CHAR3 is either zero or DV%PSD (bit 18) which indicates pseudo-device.

































                                    185
                               MONITOR TABLES


                                   IORB

   I/O Request Block.  Whenever a request for massbus I/O (that  is,  DSK
   or  MTA) occurs, an IORB is built for that request.  It is of the long
   form described below  for  magtape  requests  and  special  disk  I/O.
   However,  the most common IORB format for disk I/O is a one word IORB,
   consisting of just the status word, IRBSTS, and  stored  in  the  CST5
   table.

   Defined in:  PHYPAR

                                   Format

           +-------------------------------------------------------|
           |                           |IRLNK                      |*
   IRBSTS=0|          Status           |         Next IORB         |0=IRBLNK
           |-------------------------------------------------------|
   IRBMOD=1|            Mode, Priority, Density, Parity            |*
           |-------------------------------------------------------|
   IRBCNT=2|           Count of Hardware Bytes Transfered          |
           |-------------------------------------------------------|
           |  IRBTL                    |IRBHD                      |
   IRBXFL=3|    Transfer List Tail     |    Transfer List Head     |
           |-------------------------------------------------------|
   IRBIVA=4|            Address of Termination Routine             |
           |-------------------------------------------------------|
   IRBADR=5|          Physical Device Address (if needed)          |
           |-------------------------------------------------------|
   IRBLEN=6|                Device Dependent Data                  |*
           |                                                       \
           +-------------------------------------------------------+

            0 1 2 3 4 5 6 7 8 9 0 1 2 3 4   17 18                35
           +-------------------------------------------------------+
   IRBSTS  | | | | | | | | | | | | | | |      |                    |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        IS.SHT      0                  Short form (PAGEM)) request
        IS.DON      1                  Done with this job
        IS.ERR      2      ISERR       Error on this operation
        IS.NRT      3                  No more retries
        IS.WGU      4                  Wrong unit interrupted
        IS.TPM      5      ISTPM       Hit tape mark
        IS.EOT      6                  On write only, hit physical EOT
        IS.WLK      7                  Write locked
        IS.IER      8                  Inhibit error recovery
        IS.DTE      9                  Data error
        IS.DVE     10                  Hardware error on device
        IS.BOT     11                  Hit BOT

                                    186
                               MONITOR TABLES
                                IORB (Cont.)


        IS.RTL     12                  Record too long (buffer too small)
        IS.IEL     13                  Inhibit error logging
                  14-17    ISFCN       Function code
                  18-35    IRLNK       When referring to link


                            Function Codes for ISFCN

        Symbol    Code     Function

        IRFRED      1      Read data
        IRFRDF      2      Read data and format (count, key,
                            header)
        IRFWRT      3      Write data
        IRFWTF      4      Write format
        IRFSEK      5      Seek
        IRFFSB      6      Forward space block
        IRFBSB      7      Backspace block
        IRFWTM      10     Write tape mark
        IRFERG      11     Erase gap
        IRFREW      12     Rewind
        IRFRUN      13     Rewind and unload
        IRFRDR      14     Read reverse
        IRFRCR      15     Recovery read
        IRFWVC      16     Write with validity check
        IRFRVC      17     Read with validity check


            0               14 15  17 18       26 27   30 1 32   35
           +-------------------------------------------------------+
   IRBMOD  |                  |      |           |       | |       |
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                  15-17    IRBDM       Data Mode
                  27-30    IRBPRI      Priority
                  31       IRBPAR      Parity
                  32-35    IRBDN       Density


                            Data Modes for IRBDM

                  Symbol   Code        Meaning

                  IRMWRD     1         Word mode
                  IRM6BT     2         Six bit
                  IRM7BT     3         Seven bit
                  IRM8BT     4         Eight bit
                  IRMHID     5         High density mode

                                    187
                               MONITOR TABLES
                                IORB (Cont.)


        If device is DSK, IRBLEN becomes:

           +-------------------------------------------------------+
   IRBLEN  |                     Transfer List                     |
           |-------------------------------------------------------|
           |                           0                           |
           +-------------------------------------------------------+


        If device is MTA, IRBLEN=MTIRSD becomes:

            0           8 9          17 18                       35
           +-------------------------------------------------------+
           | IRFLG      *| IRBUN       |IRBPB                      |
   MTIRSD  |    Flags    |  Unit No.   |Ptr to Buffer of Page Ptrs |
           |-------------------------------------------------------|
           |                           | IRBOC                     |
           |                           |      Original Count       |
           |                           | (Copy of IRBCNT)          |
           |-------------------------------------------------------|
   MTIRBL  |                     Transfer List                     |
           |_______________________________________________________|
           |                           .                           |
           \                           .                           \
           |                           .                           |
           |                           .                           |
           +-------------------------------------------------------+



   Value of flags in IRFLG:


                  Bits     Pointer     Content

                    0      IRBFR       Buffer ready for use
                    1      IRBFQ       Current buffer flag
                    2      IRBFA       Active flag, IORB being filled
                                        or emptied by service routine
                    3      IRBAB       IORB aborted due to an error
                    4      IRBFF       IORB free











                                    188
                               MONITOR TABLES


                            IPCF-MESSAGE-HEADER

   IPCF Message header.  This table describes the format of  the  message
   header for message sent by the Inter-Process Communications Facility.

   Defined in:  IPCF

                                   Format

             0                        17 18                       35
            +-------------------------------------------------------+
            |  MESLNK                                               |
          0 |                 Link to Next Message                  |
            |-------------------------------------------------------|
            |  Reserved                 |  MESLEN                   |
          1 |                           |   Length of This Block    |
            |-------------------------------------------------------|
          2 |  MESSJN                   |  MESFLG                   |
            |    Sender's Job Number    |           Flags           |
            |-------------------------------------------------------|
          3 |  MESSPD                                               |
            |                   Sender's      PID                   |
            |-------------------------------------------------------|
          4 |  MESLDN                                               |
            |            Logged in Directory # of Sender            |
            |-------------------------------------------------------|
          5 |  MESENB                                               |
            |            Enabled Capabilities of Sender             |
            |-------------------------------------------------------|
          6 |  MESCDN                                               |
            |            Connected Directory # of Sender            |
            |-------------------------------------------------------|
   MESACT=7 |  MESACT                                               |
            |              Account String Block                     |
            \            (length of MESALN = 10)                    \
            |-------------------------------------------------------|
          17|  MESSLO:                                              |
            |              Logical Location String                  |
            |                Block of MESLLN (2)                    |
            |-------------------------------------------------------|
   MESWDI=21|  MESWDO                                               |
            \                        Message                        \
            |                 (PTN.PN in Page Mode)                 |
            |-------------------------------------------------------|
   MESWDI+1 |  MSFTM                                                |
            |             Mask into Fork Page Bit Table             |
            |                   (PAGE Mode only)                    |
            |-------------------------------------------------------|
   MESWDI+2 |  MESPAC                  |  MSFTI                     |
            |        Access Bits       |        Index into          |
            |          of Page         |      Fork Bit Table        |
            +-------------------------------------------------------+

                                    189
                               MONITOR TABLES


                              IPCF-PID-HEADER

   IPCF Process ID Header.  This contains overhead information  for  each
   PID in use.

   Defined in:  IPCF

            0          8 9 11 12     17 18                       35
           +-------------------------------------------------------+
           | PIDUN                     |                           |
           |          Unique           |   Length of this block    |
           |        (LH of PID)        |                           |
           |-------------------------------------------------------|
           | PIDFLG*         | PIDCHN  | PIDFW                     |
           |    Flags        |    Chn  |      Fork Number of       |
           |                 |         |       Waiting Fork        |
           |-------------------------------------------------------|
           | PIDRQ      | PIDRC        | PIDFO                     |
           |  Receive   |   Receive    |      Fork Number of       |
           |  Quota     |   Count      |     Owner of this PID     |
           |-------------------------------------------------------|
           | PIDKMP                                                |
           |   PID to receive a message if this PID gets deleted   |
           |-------------------------------------------------------| 
           | PIDNL                                                 |
           |                Link to Newest Message                 |
           |-------------------------------------------------------|
           | PIDOL                                                 |
           |                Link to Oldest Message                 |
           +-------------------------------------------------------+
         

            0                           18                       35
           +-------------------------------------------------------+
           |      ||||   |   PIDCHN    |           PIDFW           |
           |      ||||   |     CHN     |      Fork Number of       |
           |      ||||   |             |       Waiting Fork        |
           +-------------------------------------------------------+


                  Symbol   Value       Content

                  PD%JWP    10         PID is a Job-wide PID
                  PD%DIS     4         PID is disabled
                  PD%CHN     2         Channel is set up to get 
                                        interrupts
                  PD%NOA     1         No access by other forks






                                    190
                               MONITOR TABLES


                             IPCF-STORAGE-AREA

   Inter-Process Communication Facility Storage Area.  This  non-resident
   storage  is  described  followed  by  the  resident  wake-up bit table
   (PDFKTB).   THe  PID  headers  and  messages  are  contained  in   the
   Swap-free-space   pool   which   immediately  follows  this  table  in
   non-resident storage.  See also the tables, PIDCNT and PIDTBL.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   SPIDTB: |                                                       |  |
           |              Table of Commonly Used PIDS              | SPDTBL=8
           \                                                       \  |
           |-------------------------------------------------------| \ /
   PIDLOK: |       Lock on PID Free Pool and Data Structure        |
           |-------------------------------------------------------|
   NXTPID: |         Next Unique # to be used as LH of PID         |
           |-------------------------------------------------------|
   INFOPD: |                  PID of SYSTEM INFO                   |
           |-------------------------------------------------------|
   INFOPV: |            Public Value of SYSTEM INFO PID            |
           |-------------------------------------------------------|
   PIDLST: |          Number of First Free PID, 0 if none          |
           |-------------------------------------------------------|
   PIDMXP: |         Highest Page in Pages-In-Transit File         |
           |-------------------------------------------------------| / \
   PIDPBT: |                                                       |  |
           |          Bit Table of Pages-In-Transit File           | PIDPBL
           \                                                       \  |
           |-------------------------------------------------------| \ /
   PIDFTB: |                                                       | / \
           | TBL of PTN's of forks for pages in transit      |  |
           |                                                       | PIDFTL
           \                                                       \  |
           +-------------------------------------------------------+ \ /


           +-------------------------------------------------------+
   PDFKTB  | | | | | . .                                           |
           |-------------------------------------------------------|
           \               Bit Wakeup Table (1/Fork)               \
           +-------------------------------------------------------+








                                    191
                               MONITOR TABLES


                                 JOB AREA

   This area contains the job specific information.   It  is  the  entire
   JSVAR  psect.   The  JOBMAP  in  the JSB points to all of the job area
   storage.  For this area, the monitor has indirect pointers in its page
   table  (MMAP)  for its pages beginning at JSBPGA:  (which is on a page
   boundary) for the length of the job area.  All of these  pointers  are
   to  a  single  location in the SPT (specifically SPT+NOFN).  With this
   arrangement, the job area for the current process can  be  changed  to
   the  job area for another process by only changing the one location in
   the SPT.

   JBCOR contains a bit table which keeps track of which pages in the Job
   Storage  Area are in use (bit(s) = 0) and which are free (bit(s) = 1).
   The first several pages of this Job Common Area  is  always  allocated
   for  the  JSB page plus expansion pages for the JFN blocks and for the
   JSYS trap header word and trap blocks (See FKJTQ  table).   The  first
   non-reserved page begins at FREJPA (=626000).  Pages are assigned from
   the bit table, JBCOR,  by  the  routine,  ASGPAG,  and  are  used  for
   temporary  job  pages such as file window pages, magtape buffer pages,
   mapping a super index block, getting more space  for  the  free  block
   storage linked in JSBFRE, and mapping EXE file directory pages.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   JSBPGA: |                                                       | / \
           |                       JSB area                        | 1
           |                       (see JSB)                       | page
           \                                                       \ \ /
           |-------------------------------------------------------| / \
   JFNPGA: |                                                       | 3
           |          Pages continuing JFNs from the JSB           | pages
           \                                                       \ \ /
   JSJFNA: |-------------------------------------------------------|
   JTBPG:  |                                                       | / \
           |                   JSYS trap blocks                    | 2
           |               First work used by NEWJTB               | pages
           \                                                       \ \ /
           |-------------------------------------------------------|
   FREJPA: |                                                       | / \
           |                   Job free storage                    | NJSBPG
           |                                                       | (^D50)
           |                                                       | pages
           \                                                       \ \ /
           +-------------------------------------------------------+





                                    192
                               MONITOR TABLES


                                  JOBDIR

   Job Directory Table.  This table contains  the  number  of  the  login
   directory for each job.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+  / \
   JOBDIR: |        Reserved           |     Login Directory #     |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NJOBS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /

































                                    193
                               MONITOR TABLES


                                  JOBNAM

   Job Name Table.  This table contains an index into the subsystem  name
   tables (SNAMES, STIMES) indicating what subsystem, if any, each job is
   running.  The name index is for statistics only and is not used by the
   monitor.

   Defined in:  STG

   Index:  Job number

                                   Format

            0 1 2
           +-------------------------------------------------------+  / \
   JOBNAM: | | | |                     |        Name Index         |*  |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NJOBS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /


        Symbol    Bit      Pointer     Content

        JWAKEF     0       HIBFL       Flag used by HIBER JSYS.
                                       If set, implies a wakeup
                                        signal to THIBR
                   1       DIAFL       Job has DIAG resources
                  1-2      SKPCT       Skip count for NEWUTL
                 18-35                 Name index














                                    194
                               MONITOR TABLES


                                  JOBPNM

   Job Program Name.  This non-resident table contains each job's program
   name.

   Defined in:  STG

   Index:  Job number

                                   Format

           +-------------------------------------------------------+  / \
   JOBPNM: |                    Job Program Name                   |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NJOBS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /



























                                    195
                               MONITOR TABLES


                                   JOBPT

   Job Process Table.  This table contains the number of the  controlling
   terminal,  or  -1 for a detached job, and the index of the top fork of
   the job.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+  / \
   JOBPT:  |   Controlling Terminal    |      Top Fork Index       |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NJOBS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /

   Unused slots in this table are linked in a free list.  Location FREJOB
   contains a pointer to the first slot in the free list.

























                                    196
                               MONITOR TABLES


                                   JOBRT

   Job Runtime Table.  This table contains the total runtime of each  job
   (sum  of all forks) in milliseconds.  If a word contains a -1, the job
   does not exist.

   Defined in:  STG

   Index:  Job number

                                   Format

           +-------------------------------------------------------+  / \
   JOBRT:  |                        Runtime                        |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NJOBS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /






























                                    197
                               MONITOR TABLES


                                  JOBRTL

   Job Runtime Limit.  This table contains the number of clocks  (by  way
   of  TIMER  JSYS) in use by each job and a pointer to the runtime limit
   TIMER block.  A description of the TIMER  block  is  described  below.
   (See RES-FREE-SPACE).

   Defined in:  STG, PROLOG

   Index:  Job number

                                   Format

            0            12 13        
           +-------------------------------------------------------+ 
           | TIMCNT        | JOBRTP                                |  / \
   JOBRTL: | # of Clks. in |         Ptr to  Runtime Limit Block   |   |
           |  Use          |                                       |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NJOBS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \   |
           +-------------------------------------------------------+  \ /


   TIMER Run Timer Limit Block

           +-------------------------------------------------------+
           | TIMLNK                                                |
           |                  Link to next block                   |
           |-------------------------------------------------------|
           | TIMTIM                                                |
           |         Time word (when clock should go off)          |
           |-------------------------------------------------------|
           |0      5|6               17|18                       35|
           |TIMCHN  | TIMJOB           | TIMFRK                    |
           | Channel|Job that set clock|Sys fork handle to be PSI'd|
           |-------------------------------------------------------|
           | TIMKNL                                                |
           |              Back link to previous clock              |
           +-------------------------------------------------------+





                                    198
                               MONITOR TABLES


                                    JSB

   Job Storage Block.  Each job has  a  Job  Storage  Block  which  holds
   per-job  information  such as the job's fork structure, line number of
   controlling  TTY,  terminal  interrupts  enabled  and  accounting  and
   logical name information.

   JSBFRE is the free block header.  If a block of words (that  is,  <512
   words)  is  required, it is allocated from the JSFREE area in the JSB.
   Blocks in the JSFREE area are linked and when  a  block  of  words  is
   required,  the free list is searched looking for a large enough block.
   If the free list area in JSFREE is depleted, a new page (space outside
   the  JSB  in the Job Storage Area) is allocated and its space added to
   the free list for block usage.  Blocks of words are assigned from  the
   free  list,  headed  by JSBFRE by the routine, ASGFRE, and are used to
   hold temporary storage such  as  name  strings  for  JFN  blocks,  the
   job-wide Logical Names List, and the Logical Name Definition Blocks.

   JBCOR contains a bit table which keeps track of which pages in the job
   area are in use.  For further information see JOB AREA.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   JSBPGA: |                                                       |
   JOBMAP: |            Object Map for Job-Common Area             |
           \                                                       \
           |-------------------------------------------------------|*/ \
   SYSFK:  |       Job Fork Index to System Fork Index Table       |  |
           |                   (1 Entry /Job Fork)                 | NUFKS
           \                                                       \  |
           |-------------------------------------------------------| \ /
   CTTAB:  |         Not Used         |     Controlling TTY        | / \
           |                          |        #, or -1            |  |
           |                                                       | NUFKS
           |-------------------------------------------------------| \ /
   FKJTB:  |               Adr of JSYS Trap Block                  | / \
           |                   (1 Entry /Job Fork)                 |  |
           |                           .                           | NUFKS
           \                           .                           \  |
           |-------------------------------------------------------| \ /
   FKPTRS: |            Fork Pointers (Structure) Table            | / \
           |                   (1 Entry /Job Fork)                 | NUFKS
           \                                                       \  |
           |-------------------------------------------------------| \ /
   FKPSIE: |         Terminal Interrupt Enabled Word Table         | / \
           |                   (1 Entry /Job Fork)                 | NUFKS
           \                                                       \  |
           |-------------------------------------------------------| \ /


                                    199
                               MONITOR TABLES
                                JSB (Cont.)


   FKDPSI: |        Deferred Terminal Interrupts Mask Table        | / \
           |                   (1 Entry /Job Fork)                 | NUFKS
           \                                                       \  |
           |-------------------------------------------------------| \ /
   FREJFK: |                Free Job Fork Slot List                |
           |-------------------------------------------------------|
   FKLOCK: |         Lock for Fork Structure Modification          |
           |-------------------------------------------------------|
   FLKCNT: |               Nest Count for Fork Lock                |
           |-------------------------------------------------------|
   FLKOWN: |             Fork That Locked Fork Lock                |
           |-------------------------------------------------------|
   FKTIMW: |             TIMER word for lock timeout               |
           |-------------------------------------------------------|
   FKCNT:  |          Count of Active Forks in This Job            |
           |-------------------------------------------------------|
|  LSTLGN: |          Last Interactive LOGIN Date and Time         |
|          |-------------------------------------------------------|
|  NLDLGN: |      Last Non-interactive LOGIN Date and Time         |
           |-------------------------------------------------------|
   SRTTIM: |            Data & Time Job Was Initialized            |
           |-------------------------------------------------------|
   ARDFRT: |              Job Default for Retrievals               |
           |-------------------------------------------------------|
   CTRLTT: |            Line Number of Controlling TTY             |
           |-------------------------------------------------------|
|  GBLJNO: |                Global Job Number                      |
|          |-------------------------------------------------------|
   TTSPSI: |           Code Enabled Anywhere in This Job           |
           |-------------------------------------------------------|
   TTSDPS: |           Terminal Interrupt Code Deferred            |
           |-------------------------------------------------------|
   TTJTIW: |            Terminal Interrupt Enable Mask             |
           |-------------------------------------------------------|
|  JBFLTM: |           Time of Last Password Failure               |
|          |-------------------------------------------------------|
|  JBFLCT: |        Count of Password Failures in Interval         |
|          |-------------------------------------------------------|
   CONSTO: |             Console Time On (TODCLK units)            |
           |-------------------------------------------------------|
   CTIMON: |                 Connect Time On (GTAD units)          | 
           |-------------------------------------------------------|
   CONCON: |              Console Connect Time (for usage)         |
           |-------------------------------------------------------|
   JBRUNT: |                 Job Run Time (for usage)              |
           |-------------------------------------------------------|
   JBNODE: |                     Node Name (SIXBIT)                |
           |-------------------------------------------------------|
   JBBNAM: |                 Batch Job Name (SIXBIT)               |



                                    200
                               MONITOR TABLES
                                JSB (Cont.)


           |-------------------------------------------------------|
   JBBSEQ: |                  Batch Sequence Number                |
           |-------------------------------------------------------|
   ACCTSL: |                   Length of ACCTSR                    |
           |-------------------------------------------------------| / \
   ACCTSR: \                    Account String                     \ MAXLW
           |-------------------------------------------------------| \ /
   ACCTSX: |                 Expiration Data of ACCTSR             |
           |-------------------------------------------------------| / \
   CSHACT: \           Most recently Validated Account             \ MAXLW
           |-------------------------------------------------------| \ /
   CSHUSR: |      User for Whom Cached Account was Validated       | 
           |-------------------------------------------------------|
   CSHACX: |              CSHACT Expiration Date                   |
           |-------------------------------------------------------|
   CSHCLS: |              Class of Cached Account                  | / \
           |-------------------------------------------------------| WPN
   LLSR:   |                  Logical Location                     | \ /
           |-------------------------------------------------------| / \
   JSSRM:  \                    Session Remark                     \ MAXLW+1
           |-------------------------------------------------------| \ /
           |                                                       | / \
   USRNAM: \                   User Name String                    \ MAXLW+1
           |-------------------------------------------------------| \ /
   JFNLCK: |          Lock to Prevent Tampering with JFNs          |
           |-------------------------------------------------------|
|  MAXJFN: |           Maximum Number of JFNs for Job              |
           |-------------------------------------------------------|
   ENQLST: |             Forward Pointer to Q-Block                |
           |-------------------------------------------------------|
           |             Backward Pointer to Q-Block               |
           |-------------------------------------------------------|
   ENQQOT: |    ENQ Quotas & Counts   |         Reserved           |
           |-------------------------------------------------------|
   TIMALC: |               TIMER Clocks Limit                      |
           |-------------------------------------------------------|
   LNTABP: |  Pointer to Logical Name Table (Tbl is in JSB Space)  |
           |-------------------------------------------------------|
   LNMLCK: |            Lock for Logical Name Data Base            |
           |-------------------------------------------------------|
   NPRIVP: |            Number of private pages in job             |
           |-------------------------------------------------------|
   JOBUNT: |                  Connected Disk Unit                  |
           |-------------------------------------------------------|
   JBCLCK: |                    Lock for ASGPAG                    |
           |-------------------------------------------------------| / \
   JBCOR:  |    Page Allocation Bit Table for Job Storage Area     |  4
           \                                                       \ \ /




                                    201
                               MONITOR TABLES
                                JSB (Cont.)


           |-------------------------------------------------------|   --
   JSBFRE: |  Ptr. to 1st Free Block  |              0             |    |
           |-------------------------------------------------------|    |
           |                         Lock                          |    |
           |-------------------------------------------------------|
           |                     Space Counter                     |Job area
           |-------------------------------------------------------|  free
           |                Most Common Block Size                 | storage
           |-------------------------------------------------------| header
           |  Max Top of Free Stor.    |  Min. Bottom of Free Stor.|
           |-------------------------------------------------------|    |
           |                         Temp                          |    |
           |-------------------------------------------------------|    |
           |                         Temp                          |    |
           |-------------------------------------------------------|   --
   JSFREE: |        Free Storage Area in Job Block (^D64 words)    | / \
           |                                                       |  |
           |              [Free Blocks have Hdr. Wd of:            |  |
           |               Ptr. to Next Blk,, Length]              | IJSFRE
           \                                                       \  |
           |-------------------------------------------------------| \ /
   JSSTRT: |                           |  JSSTN                    |*/ \
   JSSTRF=0|           Flags           |   Structure Unique Code   |  |
           |-------------------------------------------------------|  |
           |  JSGRP                                                |  |
   JSGRPS=1|            AOBJN Pointer to List of Groups            |  |
           |-------------------------------------------------------|  |
           |  JSADN                    | JSSTMX                    |
   JSADIR=2|        **Unused**         |Accessed DIR # for This STR| *STRN
           |-------------------------------------------------------|  |
   JSFKMT=3|  JSFMT                                                |  |
           |                 Fork-mount bit word                   |  |
           |-------------------------------------------------------|  |
           |                                                       |  |
           |                (4 Words per Structure)                |  |
           \                                                       \  |
           |-------------------------------------------------------| \ /
   JSSTLK: |               Lock on the JSSTRT Block                |
           |-------------------------------------------------------|
           |  JSUC                     |  JSDIR                    |
   JSBSDN: | Connected STR Unique Code |  Connected Directory #    |
           |-------------------------------------------------------|
           |0           |              |18                       35|
   JSBCDS: | JSCDF      |              |JSCDS                      |
           |String Ptr. |              |Ptr. to Connected          |   
           |Valid if set|              |Dir. Name String           |






                                    202
                               MONITOR TABLES
                                JSB (Cont.)


           |-------------------------------------------------------|
   MODES:  |                DDBMOD Word from LOGIN                 |
           |-------------------------------------------------------|
   GROUPS: |          Groups to Which LOGIN User Belongs           |
           |-------------------------------------------------------|
   RSCNPT: |                    RESCAN Pointer                     |
           |-------------------------------------------------------|
   RSCNBP: |     Ptr. to RESCAN Buffer (max. buf. size is 777)     |
           |-------------------------------------------------------|
   JBINFO: |          PID of Private <SYSTEM>INFO for JOB          |
           |-------------------------------------------------------|
   JSCDR:  |  Next Version # (or -1)   | Adr. of Spool Set String  |
           |                           |       for CDR             |
           |-------------------------------------------------------|
   JSMTA1: |  MTA Parity, Density, Mode, and Default Record Size   |*
           |-------------------------------------------------------|
   JBFLAG: |       Spooler Flags       |                           |*
           |  (Sent on CLOSE/LOGOUT    |   General Job-wide Flags  |
           |-------------------------------------------------------|
   JSLOPD: |          PID to get LOGOUT message from CRJOB         |
           |-------------------------------------------------------|
   JSLOJB: |      Job # of Who Logged Out this Job                 |
           |-------------------------------------------------------|
   JSFSTK: |      Stack of Things to be Done on Fork Cleanup       |
           |-------------------------------------------------------|
   JSFLCK: |            Lock for This JSFSTK Structure             |
           |-------------------------------------------------------|
   CRJFLG: |Flag that this is CRJOB Startup.(Used by MEXEC & LOGIN)|
           |-------------------------------------------------------|
           | DCMAX                    | DCCUR                      |
   DCNCNT: |  Job's Network Link Quota| Current Count of Open Links|
           |-------------------------------------------------------|
   JSSRTM: |      Runtime at Start of this Accounting Session      |
           |-------------------------------------------------------|
   JSSCTM: |         Console Time at Start of this Session         |
           |-------------------------------------------------------|
|  JSSCTI: |    Universal Date and Time at Start of Session        |
|          |-------------------------------------------------------|
   JSATCT: |                 ATS HTN Quota,,Count                  |
           |-------------------------------------------------------|
   JOBSKD: |            Special Job Scheduling Parameter           |
           |-------------------------------------------------------|
   BATSTF: |           Batch Stream Number and Flags Word          |
|          |-------------------------------------------------------|
|  BATRID: |                 Batch Request ID                      |
           +-------------------------------------------------------+






                                    203
                               MONITOR TABLES
                                JSB (Cont.)


   JFN0:   +-------------------------------------------------------+  --
   FILBYT: |            Byte Pointer to Current Window             |   |
           |New I/O = FILBFI - byte pointer to current input buffer|   |
           |-------------------------------------------------------|   |
   FILBFO: |            Byte Pointer to Current Buffer             |   |
           |    New I/O = byte pointer to current output buffer    |   |
           |-------------------------------------------------------|   |
   FILBYN: |                Byte # of Current Byte                 |   |
           | New I/O = FILBNI - input byte number of current byte  |   |
           |-------------------------------------------------------|   |
   FILBNO: |     New I/O - Output Byte Number of Current Byte      |   |
           |-------------------------------------------------------|   |
   FILACT: |            Ptr to Account String or Account #         |   |
           |-------------------------------------------------------|   |
   FILLEN: |              Total File Length in Bytes               |   |
           |-------------------------------------------------------|   |
   FILCNT: |           Bytes Remaining in Current Buffer           |   |
           |         New I/O = FILBCI = Bytes remaining in         |   |
           |                   Current Input Buffer                |   |
           |-------------------------------------------------------|   |
   FILBCO: |                    Bytes Remaining                    |   |
           |-------------------------------------------------------|   |
   FILLCK: |                    File Lock Word                     |   |
           |-------------------------------------------------------|   |
|          |  FLPGN                    |  FLWPG                    |   |
|  FILWND: |      Current Page #       |Location of Current Window |   |
|          |-------------------------------------------------------|   |
|  FILSTS: |     File Status Bits      |       Status       | Mode |*  |
|          |-------------------------------------------------------|   |
|  FILST1: |                        Status                         |*  |
|          |-------------------------------------------------------|   |
|          |  STR                      |  FLDTB                    |   |
|  FILDEV: |     Structure Number      |DEV`DTB (i.e.Dev Disp. Tbl)|   |
|          |-------------------------------------------------------|   |
|          |  FLFCO                    |  FLSCS                    |   |
|  FILNLP: |     Flow Control Option   |       Segment Size        |   |
|          |-------------------------------------------------------|   |
|          |  FLPTN                    |  FLPTT                    |   |
|  FILOFN: |   OFN for This File       | OFN of Long File PT Table |
|          |-------------------------------------------------------| JFN
|          |  FLMPC                    |  FLTTW                    |
|  FILLFW: |   Count of Pages Mapped   | Loc. of Page Table Table  | BLOCK
|          |-------------------------------------------------------|
|          |  FLDSB                    |  FLDNO                    |
|  FILDDN: |Ptr. to Device String Block|        Directory #        |   |
|          |-------------------------------------------------------|   |
|          |  FLDIR                    |  FLATL                    |   |
|  FILDNM: |   Directory Name String   | Ptr to Attribute List     |   |
|          |-------------------------------------------------------|   |
|          |  FLNSB                    |  FLESB                    |   |
|  FILNEN: |File Name String Blk. Ptr. |   Ext. String Blk. Ptr.   |   |

                                    204
                               MONITOR TABLES
                                JSB (Cont.)


|          |-------------------------------------------------------|   |
|          |  ORG                      |  FLVNO                    |   |
|  FILVER: | Fork # of JFN Originator  |         Version #         |   |
|          |-------------------------------------------------------|   |
|          |  FLDMS                    |  FLNMS                    |   |
|  FILMS1: |    Directory Wild Mask    |      Name Wild Mask       |   |
|          |-------------------------------------------------------|   |
|          |  FLEMS                    |                           |   |
|  FILMS2: |    Extension Wild Mask    |                           |   |
|          |-------------------------------------------------------|   |
|  FILFDB: |            Address of FDB in the Directory            |   |
|          |-------------------------------------------------------|   |
|          |  FLUC                     |  FLP0                     |   |
|  FILCOD: |      STR Unique Code      |   PTO OFN for Long File   |   |
|          |-------------------------------------------------------|   |
|          |  FLLNK                    |  FLLND                    |   |
   FILNND: |       DECnet Port #       |  Ptr to node name string  |   |
           |-------------------------------------------------------|  --
           |                 Additional JFN Blocks                 |
           \                           .                           \
           +-------------------------------------------------------+

   Each JFN uses a block of 19  (MLJFN)  words.   (Since  JFNs  can  grow
   beyond  the  end of the JSB into successive pages, the JFN blocks must
   be the last storage defined in the JSB.) MJFN is the maximum number of
   JFNs.

   These definitions are used in the  above  positions  only  during  the
   GTJFN procedure:

   (1)  FILTMP / Ptr. to temp string block for default ,, Ptr. to 
                  temp string block
   (2)  FILPRT / Ptr. to protection string or protection number
   (3)  FILSKT / Arpanet connection no.,, Unused
        FILOPT / Byte Ptr. to Store String in GTJFN
   (4)  FILLIB / For DECNET, Ptr to LL Block 
   (5)  FILLNM / Ptr. to RDTEXT buffer ,, Ptr. to logical name
                  chain **
   (6)  FILBFO / For DECNET, Output Buffer Ptr.
   (7)  FILIDX / 0 ,, Index into device tables for original
                  devices GTJFNed
                  {(doesn't change during spooling)}
        FILBFI / For DECNET, Ptr. to Input Buffer
   (8)  FILBCT / For DECNET, Ptr. to Counts








                                    205
                               MONITOR TABLES
                                JSB (Cont.)


   Logical Name Header Format

           +-------------------------------------------------------+
           |   LNMCNT                  ||   LNMSTP                 |
           |        Depth Count        ||      Step Counter        |
           |-------------------------------------------------------|
           |   LNMLNK                  |    LNMPNT                 |
           |        Link to Next BLK   |  Logical Name String Ptr  |
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                   0-17    LNMCNT      Depth count for logical
                                        names
                    18     LMMIDX      Index into logical name
                                        tables
                  19-35    LNMSTP      Step counter at time of
                                        chaining
                   0-17    LNMLNK      Link to next chain block
                  18-35    LNMPNT      Pointer to logical name
                                        string
           +-------------------------------------------------------+
   FILSTS  |           flags        |          mode                |
           +-------------------------------------------------------+


        Symbol       Bits     Pointer    Contents

        OPNF          0                  File is open
        READF         1                  File is OK to read
        WRTF          2                  File is OK to write
        XCTF          3                  File is OK to execute
        RNDF          4                  File is OK to reset ptr.
                                          (that is, not append)
        NONXF         5                  Non-existent File, delete
                                          FDB on RLJFN
        NWTF          6                  No wait on DUMP I/O
        LONGF         7                  File is a long file
        EOFF          8                  End of file if read
                                          attempted
        ERRF          9                  Bytes read may be wrong
        NAMEF        10                  Name is associated with
                                          this JFN
        ASTF         11                  An * was typed in
        ASGF/BLKF    12                  JFN is being assigned or
                                          service routine wants to
                                          block; shares a bit
                                          position with ASGF
        HLTF         13                  Halt if I/O error
        WNDF         14                  Window page has been set up

                                    206
                               MONITOR TABLES
                                JSB (Cont.)


        ENDF/TRNSL   15                  File is past end of maximum
                                          length.
                                         Bit timeshared with ENDF to 
                                          say the JFN is in a trans-
                                          itional state and may not
                                          be accessed.
        SIZE         16                  Illegal to change size of byte
        FRKF         17                  File is restricted to fork
                                          in LH(FILVER)
        PASLSN       18                  Set to skip line number 
                                          checking on ASCII files
        SKIPBY       19                  Set by BYTINA to remember
                                          that it has to discard.
        XQTAF        20                  Quota exceeded Flag
        FILDUD       21                  Suppress DDMP action if set
        FILINP       22                  Direction of I/O is input
        FILOUP       23                  Direction of I/O is output
        HLDF         24                  Hold in balance set
        RECF         25                  End of record seen
        ACRLFF       26                  Add CRLF's after records on
                                          input
        CRNXT        27                  Return CR next
        LFNXT        28                  Return LF next
        FROSTF       29                  Record has been frosted
                   18-35      IOMODE     Mode File is opened in


|          |-------------------------------------------------------|
|  FILST1  |                                                       |
|          +-------------------------------------------------------+
|  
|  
|       Symbol       Bits     Pointer    Contents
|  
|       FILNO         0                  New output
|       ASGF2         1                  Shadow bit for ASGF
















                                    207
                               MONITOR TABLES
                                JSB (Cont.)


            0 1 2 3 4 5    8 9       17 18                       35
           +-------------------------------------------------------+
   SYSFK:  | | | | | |      |          |                           |
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                   0                   JRFN not in use
                   1       SFEXO       Fork is Execute-Only if set
                   2       SFNVG       Fork is not "virgin" if set
                   3       SFGXO       Fork can PMAP into execute-only 
                                        forks
                   4       SFSRT       Fork has been started
                  9-17     FKHCNT      Count of handles on a given fork
                 18-35                 System fork number


   Work 0 of 4-word structure block (starts at JSSTRT)

            0 1 2 3                   17 18                      35
           +-------------------------------------------------------+
           | | | |                      |  JSSTN                   |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

                   0       JSSDM       Structure is dismounted
                   1       JSMCI       Mount count has been incremented 
                                        by structure
                   2       JSXCL       Structure is mounted exclusively 
                                        by the structure
        JSFRST   18-35     JSSTN       Structure unique code


            0          9 10 11  14 15  17 18                     35
           +-------------------------------------------------------+
   JSMTA1  |            |  | JSMTD |JSMTM |         JSMTR          |
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                   10      JSMTP       Default Parity
                 11-14     JSMTD       Default Density
                 15-17     JSMTM       Default Mode for transfers
                 18-35     JSMTR       Default record size (hardware 
                                        bytes)



                                    208
                               MONITOR TABLES
                                JSB (Cont.)


            0 1 2 3 4               17 18 19 20                  35
           +-------------------------------------------------------+
   JBFLAG  | | | | |                  |  |  |  |                   |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        SP%BAT     0       JSBAT       Job is being controlled
                                        by BATCH
        SP%DFS     1       JSDFS       Spooling is deferred
        SP%ELO     2       JSELO       Job executed LOGOUT JSYS
        SP%FLO     3       JSFLO       Job forced to LOGOUT by 
                                        top Fork error
        SP%OLO     4       JSOLO       Job logged out by other
                                        job
                  18       JBMX        Job has been in the
                                        mini-exec
                  19       JBT20       Job is at TOPS-20 command
                                        level
































                                    209
                               MONITOR TABLES


                                    KB

   KB contains the DECnet Counter Block Sub-fields.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | |              KBWID              |               KBTYP                |
          | |      Counter width in bits      |       Counter Type (Number)        |
          |------------------------------------------------------------------------| 
   KBVAL  |                             Counter Value                              |        
          |------------------------------------------------------------------------| 
   KBMSK  |                                Bit Mask                                |        
          +------------------------------------------------------------------------+ 

           Field KBBMF     (0-0)   Bit Map Flag



































                                    210
                               MONITOR TABLES


                                    KDB

   Kontroller Data Block (TM02/3, DX20, and CI nodes)

   Defined in:  PHYPAR, PHYM2, PHYP2, SCAPAR

                                   Format

             +-------------------------------------------------------+
   KDBSTS=0  |           Flags           |         Unit Type         | *
             |-------------------------------------------------------|
   KDBIUN=1  |            Initial AOBJN Word to UDB Table            |
             |-------------------------------------------------------|
   KDBCUN=2  |            Current AOBJN Word to UDB Table            |
             |-------------------------------------------------------|
   KDBDSP=3  |             Dispatch for Service Routine              |
             |-------------------------------------------------------|
   KDBDDP=4  |                                                       | *
   =KDBUDB   |                  UDB Pointer Table                    |
             \                                                       \
             |-------------------------------------------------------|
             |                                                       |
             |                 Device Dependent Code                 |
             \                                                       \
             +-------------------------------------------------------+

            0 1 2 3 4                17 18                        35
             +-------------------------------------------------------+
   KDBSTS    | | | | |                   |                           |
             +-------------------------------------------------------+

        Symbol    Bits     Pointer     Content

        KS.ACT     1                   Controller Active if set
        KS.HLT     2                   Microcode is halted
        KS.DSK     3                   Controller for disks
                 18-35                 Unit type (see unit
                                        types in UDBSTS in UDB)















                                    211
                               MONITOR TABLES
                                KDB (Cont.)


   Device dependent sector for TM02/3

             +-------------------------------------------------------+ / \
   KDBUDB=   |                                                       |  |
   KDBDDP    |                   UDB Pointer Table                   |  8
             \                                                       \ \ /
             |-------------------------------------------------------|
   TM2ADR:   |              Massbus Address of TM02/3                |
             |-------------------------------------------------------|
   SAVUDB:   |               Current UDB (0 if none)                 |
             |                      2020 Only                        |
             |-------------------------------------------------------|
   TM.CNI:   |                 CONI of RH goes here                  |
             |-------------------------------------------------------|
   TM.CS1:   |               DATAI RH control Register               |
             |-------------------------------------------------------|
   TM.DBF:   |                DATAI RH Data Register                 |
             |-------------------------------------------------------| / \
   TM2REG:   |               Drive Registers go here                 |  |
             |                                                       |  |
             |                                                       | 12
             |                                                       |  |
             |                                                       |  |
             \                                                       \ \ /
             +-------------------------------------------------------+

   LK.TM2 = Length of TM02 KDB

   Device Dependent Sector for TM78

             +-------------------------------------------------------+
   KDBUDB=   |                   UDB Pointer Table                   |
   KDBDDP    |                                                       |
             |-------------------------------------------------------|
   TM8ADR    |               MASSBUS Address of TM78                 |
             |-------------------------------------------------------|
   SAVUDB    |               Current UDB (0 if none)                 |
             |-------------------------------------------------------|
   SAVLSI    |                 Last Interrupt Code                   |
             |-------------------------------------------------------|
   TM8XCW    |         CCW for Reading Extended Sense Info           |
             |-------------------------------------------------------|
   TM8SCW    |        Saved CCW While Reading Extended Sense         |
             |-------------------------------------------------------|
   TM8ACT    |           Count of Asynchronous Interrupts            |
             |-------------------------------------------------------|
   TM8CNI    |                CONI of RH Goes Here                   |
             |-------------------------------------------------------|
   TM8CS1    |              DATA1 RH Control Register                |



                                    212
                               MONITOR TABLES
                                KDB (Cont.)


             |-------------------------------------------------------|
   TM8DBF    |               DATA1 RH Data Register                  |
             |-------------------------------------------------------|
   TM8REG    |             Drive Registers Start Here:               |
             |                                                       |
   DR.CR=0   |             Drive Control Register                    |
             |-------------------------------------------------------|
   DR.ICD=1  |         Interrupt code (Data XFER) Register           |
             |-------------------------------------------------------|
   DR.FMT=2  |             Record Count/Format Register              |
             |-------------------------------------------------------|
   DR.ER=3   |                    Error Register                     |
             |-------------------------------------------------------|
   DR.AS=4   |             Attention Summary Register                |
             |-------------------------------------------------------|
   DR.BC=5   |                Byte Count Register                    |
             |-------------------------------------------------------|
   DR.DT=6   |                Drive Type Register                    |
             |-------------------------------------------------------|
   DR.SR=7   |                  Status Register                      |
             |-------------------------------------------------------|
   DR.SN=10  |              Serial Number Register                   |
             |-------------------------------------------------------|
   DR.DG=11  |               Diagnostic Register                     |
             |-------------------------------------------------------|
   DR.DG2=12 |               Diagnostic Register                     |
             |-------------------------------------------------------|
   DR.ICN=13 |        Interrupt Code (Non Data-XFER) Register        |
             |-------------------------------------------------------|
   DR.ND0=14 |        Non Data-XFER Command, Unit 0 Register         |
             |-------------------------------------------------------|
   DR.ND1=15 |             Command, Unit 1 Register                  |
             |-------------------------------------------------------|
   DR.ND2=16 |             Command, Unit 2 Register                  |
             |-------------------------------------------------------|
   DR.ND3=17 |             Command, Unit 3 Register                  |
             |-------------------------------------------------------|
   DR.IA=20  |             Internal Address Register                 |
             |-------------------------------------------------------|
   DR.TMS=21 |                 TM Status Register                    |
             |-------------------------------------------------------| / \
   TM8REV    |                  ROM Rev Levels                       |  2
             \-------------------------------------------------------\ \ /
   TM8XSN    |              Extended Sense Information               | / \
             \                                                       \  17
             +-------------------------------------------------------+ \ /






                                    213
                               MONITOR TABLES
                                KDB (Cont.)


   Device dependent sector for DX20
             +------------------------------------------------------+ / \
   K.DUDB=   |                                                      |  |
   KDBDDP    |                   UDB Pointer Table                  | NUMDRV
             \                                                      \  |
             |------------------------------------------------------| \ /
   K.DXAD:   |                Massbus Address of DX20               |
             |------------------------------------------------------|
   K.STCT:   |         Number of Time Microcode Restarted           |
             |------------------------------------------------------|
   K.STCL:   |         Clock Timer for Restarts on Overdues         |
             |------------------------------------------------------|
   K.DNUM:   |            Number of Drives in Existence             |
             |------------------------------------------------------|
   D.SAVQ:   |          Storage for Q1 on ATTN Interrupts           |
             |------------------------------------------------------|
   K.DVER:   |                  Microcode Version                   |
             |------------------------------------------------------|
   K.DREG:   |                                                      | / \
             |               Drive Registers go here                |  |
             |                                                      | REGNUM
             \                                                      \  |
             |------------------------------------------------------| \ /
   K.DEXS:   |                                                      | / \
             |                Extended Status Table                 |  |
             |                                                      | (SNSNUM+3)/4
             \                                                        \  |
             +------------------------------------------------------+ \ /
   K.DCNI:   |                 CONI of RH on Error                  |
             |------------------------------------------------------|
   K.DCS1:   |             DATAI of RH Control Register             |
             |------------------------------------------------------|
   K.DDBF:   |               DATAI of RH Data Register              |
             |------------------------------------------------------|


















                                    214
                               MONITOR TABLES
                                KDB (Cont.)


   LK.DX2 = Length of DX20 KDB

   Device dependent sector for CI node

             |-------------------------------------------------------| /|\
   KDBUDB=   |                  UDB Pointer Table                    |  |
   KDBDDP    \                                                       \ PRTMXU
             |-------------------------------------------------------|  |
   KDBCID:   |                    Controller ID                      | \|/
             |-------------------------------------------------------| / \
             |                   8  8-bit Bytes                      |  2
             |-------------------------------------------------------| \ /
   KDBIAC:   |        Saved ACs for Initialization of a Node         | /|\
             |                                                       |  |
             |                                                       |  10
             |                                                       |  |
             \                                                       \ \|/
             |-------------------------------------------------------|
             |                      System Block                     |
             |      (See description elsewhere in this manual)       |
             |                                                       |
             \                                                       \
             |-------------------------------------------------------|





























                                    215
                               MONITOR TABLES


                                    LB

   This is the loopback portion of a DECnet Request Block.

   Defined in:  LLMOP

                                            Format                                  

                                  Message Block for Loopback                        
          +------------------------------------------------------------------------+ 
   LBAAD  |                           Assistant Address                            |   
          |------------------------------------------------------------------------| 
   LBALV  |                            Assistance Level                            |   
          +------------------------------------------------------------------------+ 







































                                    216
                               MONITOR TABLES


                                    LD

   This is the DECnet loopback data area; the data buffer is supplied  by
   the user.

   Defined in:  LLMOP

                                            Format                                  

                                   Loopback Data Output MSD                         
          +------------------------------------------------------------------------+   /\   
   LDMSD  |                                                                        | MD.LEN 
          \                                                                        \   \/   
          +------------------------------------------------------------------------+ 







































                                    217
                               MONITOR TABLES


                                    LH

   This is the DECnet Loopback LLMOP Header MSD.

   Defined in:  LLMOP

                                            Format                                  

                                        MSD for header                              
          +------------------------------------------------------------------------+ 
   LHIDD  |                 ID word to hack for Transmit Complete                  |   
          |------------------------------------------------------------------------|   /\   
   LHMSD  |                                                                        | MD.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|       /\       
   LHDAT  |             Room for Largest Loopback header (Full Assist)             | <<LHH.LN+3>/4> 
          \                                                                        \       \/       
          +------------------------------------------------------------------------+ 



































                                    218
                               MONITOR TABLES


                                    LI

   The following is the definition of the Line-ID (LI)  that  the  DECnet
   router maps into a line block address.  This is used:

   o On an initial open from the DLL to ROUTER;
   o By router to determine any Kontroller specific peculiarities;
   o By network management to communicate with ROUTER.

   Defined in:  D36PAR

                                            Format                                  

                                           Line-ID                                  
          +------------------------------------------------------------------------+ 
          | |   |   LIDEV   |      LIKON      |      LIUNI      |      LIDRP       |
          | |   |Device type|   Controller    |   Unit number   |   Drop number    |
          | |   |           |number (CPU# for |                 | (port for CI's)  | *
          | |   |           | DTE's and CI's) |                 |                  |
          +------------------------------------------------------------------------+ 

           Field LILXC     (0-0)   Bit indicating line ID (1) or circuit ID (0).































                                    219
                               MONITOR TABLES


                                    LK

   LK represents the format of DECnet storage location NSPLKF, which is a
   bit map of pending NSPLCF requests.

   Defined in:  LLINKS

                                            Format                                  

                                        BITS IN NSPLKF                              
          +------------------------------------------------------------------------+ 
          | | | |     |                                                            |
          |   LKFLG   |                                                            | *
          +------------------------------------------------------------------------+ 

             For field LKFLG(0-5):
                   LKJIF      0    Jiffy service, must be sign bit for NSPJIF
                   LKCGT      1    Congestion-detected service
                   LKRLV      2    Congestion-relieved service


































                                    220
                               MONITOR TABLES


                                    LN

   LN is the definition of the DECnet-36 Loopback Node block.  A block is
   created  every  time  a  loopback  node is defined for a circuit.  The
   blocks are chained together, and the  first  block  on  the  chain  is
   pointed to by monitor location SCTLNL.

   Defined in:  SCLINK

                                            Format                                  

          +------------------------------------------------------------------------+ 
   LNNXT  |                    Ptr to next loopback node block                     |                 
          |------------------------------------------------------------------------| 
   LNNAM  |                           Loopback node name                           |                 
          |------------------------------------------------------------------------| 
   LNCIR  |                            Loopback circuit                            |                 
          +------------------------------------------------------------------------+ 



































                                    221
                               MONITOR TABLES


                          LOGICAL-NAME-DEFINITION

   Logical Name Definition Block.  The block format given below  is  used
   for   system   and  job-wide  logical  name  definitions.   The  first
   definition block for a logical name is pointed to by its Logical  Name
   List  and  is  stored  in the swappable free space if a system logical
   name or in the JSB space if a job-wide logical name.

   Defined in:  LOGNAM

   Reference by:  LOGNAM

                                   Format

           +-------------------------------------------------------+
   LNBLK=0 |   PTR TO NEXT DEFINITION  |    SIZE OF THIS BLOCK     |
           |     (OR ZERO IF NONE)     |       (USUALLY 12)        |
           |-------------------------------------------------------|
   LNDEV=1 |        ASCII BYTE PTR TO DEVICE BLOCK (IF ANY)        |
           |-------------------------------------------------------|
   LNDIR=2 |      ASCII BYTE PTR TO DIRECTORY BLOCK (IF ANY)       |
           |               (-3 MEANS STAR WAS TYPED)               |
           |-------------------------------------------------------|
   LNNAM=3 |       ASCII BYTE POINTER TO NAME BLOCK (IF ANY)       |
           |-------------------------------------------------------|
   LNEXT=4 |       ASCII BYTE POINTER TO FILE TYPE (IF ANY)        |
           |         (-2 MEANS A NULL FIELD WAS SPECIFIED)         |
           |-------------------------------------------------------|
   LNVER=5 |        500000,,0 + GENERATION NUMBER (IF ANY)         |
           |-------------------------------------------------------|
   LNACT=6 |           500000,,0 + ACCOUNT NUMBER  -OR-            |
           |     ASCII BYTE POINTER TO ACCOUNT STRING (IF ANY)     |
           |-------------------------------------------------------|
   LNPRT=7 |         500000,,0 + FILE PROTECTION (IF ANY)          |
           |-------------------------------------------------------|
   LNTMP=10|      0 IF PERMANENT OR -1 IF TEMPORARY (IF ANY)       |
           |-------------------------------------------------------|
   LNATR=11| PREFIX VALUE OF CURRENT   |   PTR TO ATTRIBUTE CHAIN  |
           |          PREFIX           |                           |
           +-------------------------------------------------------+













                                    222
                               MONITOR TABLES


                            LOGICAL-NAMES-LIST

   Logical Names List.  The list described below is the format  used  for
   the  system logical names list (pointed to by SYLNTB) and the job wide
   logical names list (pointed to by the JSB entry, LNTABP.)

   The system logical names list is built in  the  swappable  free  space
   from  the  entries  in  SYNMTB  at  system  initialization time.  (See
   SWAP-FREE-SPACE and SYNMTB tables).  A job's  logical  names  list  is
   built in the JSB space the first time a logical name is created.

   An entry in a logical names list has a pointer  to  the  logical  name
   string  (in ASCIZ) in the left half and a link to the first definition
   block in the right half (See LOGICAL-NAME-DEFINITION description).

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
           |  # OF DEFINED LOG NAMES   | SPACE ALLOCATED IN TABLE  |
           |-------------------------------------------------------|
           |   LOGICAL NAME BLK ADDR   | LINK TO FIRST DEFINITION  |
           |-------------------------------------------------------|
           |   LOGICAL NAME BLK ADDR   | LINK TO FIRST DEFINITION  |
           |-------------------------------------------------------|
           |                           .                           |
           |                           .                           |
           \                           .                           \
           +-------------------------------------------------------+























                                    223
                               MONITOR TABLES


                             LPT-STORAGE-AREA

   Line Printer Storage Area.  Each entry in the resident  area  is  LPTN
   words  long,  where  LPTN  equals  the  number of line printers on the
   system.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   LPTTYP: \        Type of LPT Vector for Dev. Independence       \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   LPTSTS: \                      Status Word                      \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   LPTST1: \                  Second Status Word                   \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   LPTST2: \                   Third Status Word                   \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   LPTST3: \                  Fourth Status Word                   \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   LPTERR: \                    Last Error Word                    \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   LPTCNT: \                    Buffer Counter                     \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   LPTCLS: \                  LPTCHK Clock Switch                  \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   LPTCCW: \                    BLKI/O Pointer                     \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   LPTICT: \                 Interrupt Byte Count                  \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   LPTCKT: \                  Interval for LPTTIM                  \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   LPTLCK: \                 Lock on Opening LPT                   \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   PGDATA: \            Page Counter to be Sent to -11             \ LPTN
           +-------------------------------------------------------+ \ /




                                    224
                               MONITOR TABLES
                          LPT-STORAGE-AREA (Cont.)


   The following LPT:  storage items are in the nonresident area  of  the
   monitor.

           +-------------------------------------------------------+ / \
   LPTBUF: |                                                       | LPTN * 2
           \     2 Buffers (each NLPBF=400 words) for each LPT:    \ * NLPBF
           |-------------------------------------------------------| \ /
           |  VFUOFN                   |  RAMOFN                   | / \
   LPTOFN: |            VFU            |            RAM            |  |
           \    OFN's to Prevent Opens for Write (1 entry/DTE)     \ LPTN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   VFUFIL: |       Swappable Storage Area for VFU File Names       | LPFLSZ*
           \                                                       \  LPTN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   RAMFIL: |       Swappable Storage Area for RAM File Names       | LPFLSZ*
           \                                                       \  LPTN
           +-------------------------------------------------------+ \ /

   If the assembly flag, SMFLG, is set, indicating a 2020  monitor,  then
   the  following additional storage is assembled in the resident area of
   the monitor:

           +-------------------------------------------------------+
   L11A:   |              Holds Fake -11 Adr of Buf                |
           |                  (1 entry / LPT )                     |
           |-------------------------------------------------------|
   LPWINA: |              Address of Unibus Window                 |
           |-------------------------------------------------------| / \
   LPACS:  |            AC Storage During LPT Interrupt            |  |
           |                                                       |  16
           |-------------------------------------------------------| \ /
   LPSTAK: |                                                       | / \
           |                 PDL During LPT Interrupt              | LPSLEN
           \                                                       \  |
           |-------------------------------------------------------| \ /
   LPXJEN: |         XJEN Instr. for Dismissing LPT Interrupt      |
           |-------------------------------------------------------| / \
   LPXPTB: |    LPT Interrupt Instr. is XPCW to this 4-word Blk    | LPTN(1)*4
           +-------------------------------------------------------+ \ /











                                    225
                               MONITOR TABLES
                          LPT-STORAGE-AREA (Cont.)


            0            11 12           23 4 5 6 7 8 9 0 1 2 3 4 5
           +-------------------------------------------------------+
   LPTSTS: |    LPTFE      |    LPTMX      | | | | | | | | | | | | |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        LP%FE      0-11    LPTFE       Bytes now in front end
        LP%MX     12-23    LPTMX       Max. bytes allowed in front end
        LP%LHC     24      LPLHC       Loading has completed flag for 
                                        RAM/VFU load
        LP%HE      25      LPTHE       Hard error on this LPT:
        LP%OBF     26      LPOBF       Output is being flushed
        LP%MWS     27      LPMWS       MTOPR is waiting for a status to
                                        arrive
        LP%ER      28      LPTER       LPT had an error
        LP%OL      29      LPTOL       LPT on-line
        LP%TBL     30      LPTBL       LPT is over allocation
        LP%TWT     31      LPTWT       Request on Q.
        LP%THN     32      LPTHN       Line printer control failed
        LP%OPN     33      LPOPN       LPT is opened
        LP%ALI     34      ALTI        Interrupt buffer pointer
        LP%ALP     35      ALTP        Buffer Pointer




























                                    226
                               MONITOR TABLES
                          LPT-STORAGE-AREA (Cont.)


            0        5 6           17 18 19 20                   35
           +-------------------------------------------------------+
   LPTST1: |   LPPSI  |     LPPAG    |  |  |        LPSST          |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        LP%PSI     0-5     LPPSI       Channel number on which 
                                        PSI's are desired
        LP%PAG     6-17    LPPAG       Page Counter
        LP%LCP      18     LPLCP       Lower case printer
        LP%SHA      19     LPSHA       Status has arrived
        LP%SST    20-35    LPSST       Software status word
                                        Entry as follows:

                  Symbol   Bits        Content

                  .DVFFE    28         Device has a fatal,
                                        unrecoverable error
                  .DVFLG    29         Error logging information
                                        follows
                  .DVFEF    30         EOF
                  .DVFIP    31         I/O in progress
                  .DVFSE    32         Software condition
                  .DVFHE    33         Hardware error
                  .DVFOL    34         Offline
                  .DVFNX    35         Nonexistent device


            0 1             12 13                 28 29 30       35
           +-------------------------------------------------------+
   LPTST2: | |    SAVBCT      |       SAVBUS        |  |           |
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                    0      ARROWF      Convert control to arrow character
                   1-12    SAVBCT      Saved byte counter during arrow
                  13-28    SAVBUS      Saved bus address register
                    29     LPTLOR      On when loading ram










                                    227
                               MONITOR TABLES
                          LPT-STORAGE-AREA (Cont.)


   2020 only:

            0 1          8 9                  23 24              35
           +-------------------------------------------------------+
   LPTST3: |  |  SAVCHR   |        LPTCC        |                  |
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                    0      LPXBIT      On if printer exists
                   1-8     SAVCHR      Saved LP buffer character
                  24-35    LPTCC       Count of characters sent to 
                                        printer


            0                     17 18 19 20                    35
           +-------------------------------------------------------+
   LPTERR: |         LPFRK          |  |  |         LPERR          |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        LP%FRK     0-17    LPFRK       Fork ID of owning PSI process
        LP%MSG      18     LPMSG       If on, suppress standard
                                        messages
        LP%PCI      19     LPPCI       Page counter has interrupted
        LP%ERR    20-35    LPERR       Last error indication


            0       5 6       15 16 17 18                        35
           +-------------------------------------------------------+
   LPTCLS: |  LPBSZ  |          |  |  |                            |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        LP%BSZ    0-5      LPBSZ       Byte size of OPENF
        LP%RLD     16      LPRLD       Front end was reloaded
        LP%NOE     17      LPNOE       Note occurrence of EOF










                                    228
                               MONITOR TABLES
                          LPT-STORAGE-AREA (Cont.)


            0                15 16 17                31 32 33 34 35
           +-------------------------------------------------------+
   PGDATA: |      PGFNC        |  |      PGCTR         |  |  |  |  |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

                   0-15    PGFNC       Function code:  load page
                                        counter
                    16     PGENB       Enable interrupts
                  17-31    PGCTR       Page counter value
        LP%IRP      32     LPIRP       Interrupt request pending
        LP%RBR      33     LPRBR       RAM or VFU being reloaded
        LP%LTR      34     LPLTR       Translation RAM requires
                                        reloading
        LP%LVF      35     LPLVF       VFU requires reloading



































                                    229
                               MONITOR TABLES


                                    LS

   LS is used to extract DECnet link service flags from a register.

   Defined in:  LLINKS

                                            Format                                  

                         The LSFLAGS field of a link service message                
          +------------------------------------------------------------------------+ 
          |                                                       | LSZRO |   |    |
          |                                                       | Must  |   |    | *
          |                                                       |be zero|   |    | 
          +------------------------------------------------------------------------+ 

           Field LSINT     (32-33)     Interpretation

                 LS.INR=0  Normal data request
                 LS.IOT=1  Other data request (2 & 3 reserved)

           Field LSMOD     (34-35)     The on/off indicator

                 LS.MNC=0  No change, code uses JUMPE
                 LS.MOF=1  Turn sublink off (ignored on "other")
                 LS.MON=2  Turn sublink on  (ignored on "other")
                 LS.MRS=3  Reserved



























                                    230
                               MONITOR TABLES


                                    LT

   This is the DECnet Line table structure.

   Defined in:  DNADLL

                                            Format                                  

          +------------------------------------------------------------------------+ 
   LTLID  |                                 Line ID                                | 
          |------------------------------------------------------------------------| 
          | | |   |   |   LTPRO   |   LTCTY   |   LTDBF   |         LTBSZ          |
          | | |   |   | Protocol  |  Circuit  |  Default  |Maximum receive buffer  | *
          | | |   |   |   type    |   type    | number of |   size on this line    | 
          | | |   |   |           |           |  buffers  |                        |
          |------------------------------------------------------------------------| 
          |               LTBNO               |               LTNBP                |
          |     Number of buffers to post     |     Number of buffers posted       |
          +------------------------------------------------------------------------+ 

           For field LTFLG(0-1):
                   LTDVE      0    Driver believes device is present
                   LTCAD      1    Channel address is DECnet (Ethernet only)

           Field LTSTA     (2-3)   State of line

           Field LTCON     (4-5)   Controller (normal/loopback)


























                                    231
                               MONITOR TABLES


                                    MB

   The following is the definition of the DECnet-36 Message Block.   This
   is  the  fundamental  data  structure  used to represent an individual
   message.  The Message Block is divided up into a  public  section  and
   several  private  sections  which  belong to each of the layers of the
   DECnet architecture.

   Defined in:  D36PAR

                                            Format                                  

                                      The Public Section                            
          +------------------------------------------------------------------------+ 
   MBNXT  |   Ptr to next message.  Must be full word for NSP, see  BEGSTR QP in   |        
          |                           LLINKS.MAC                                   |
          |------------------------------------------------------------------------| 
   MBFMS  |    Pointer to first MSD  (DLLs expect this field to be right here)     |        
          |------------------------------------------------------------------------| 
   MBMSN  |    DDCMP message number  (DLLs expect this field to be right here)     |        
          |------------------------------------------------------------------------| 
          |               MBDST               |               MBSRC                |
          |         Destination node          |            Source node             |
          |------------------------------------------------------------------------| 
   MBDS1  |                      First 32 bits of destination                      |        
          |------------------------------------------------------------------------| 
   MBSR1  |                        First 32 bits of source                         |        
          |------------------------------------------------------------------------| 
          | | | | | | | | | |      MBVST      |               MBABS                |
        * |      MBFLG      |  Visits count   |      Adjacency's block size        |
          |------------------------------------------------------------------------| 
   MBCHN  |                     Loopback channel (Circuit ID)                      |        
          |------------------------------------------------------------------------| 
   MBPRC  |                     Procedure processor (NSP & SC)                     |        
          |------------------------------------------------------------------------| 
   MBAR1  |                     Argument storage #1 (NSP & SC)                     |        
          |------------------------------------------------------------------------| 
   MBAR2  |                     Argument storage #2 (NSP & SC)                     |        
          |------------------------------------------------------------------------| 
   MBAR3  |                     Argument storage #3 (NSP & SC)                     |        
          +------------------------------------------------------------------------+ 

           For field MBFLG(0-8):
                   MBOTH      0    On the "other" sublink
                   MBBOM      1    Beginning of message
                   MBEOM      2    End of message
                   MBEBF      3    Message block has been allocated from emergency 
                                   buffer free list
                   MBPH2      4    Phase II message
                   MBDON      5    "Synchronous" interlock done bit (NSP & SC)
                   MBLCL      6    Bound for the local NSP
                   MBUNR      7    Unreachable

                                    232
                               MONITOR TABLES


                                 MD-D36PAR

   This is the DECnet-36 Message Segment Descriptor.   Every  Segment  of
   the  message  is  described by this small block.  In the typical case,
   this descriptor resides in the owner's (the owner  being  a  level  of
   DECnet) portion of the Message Block.

   Defined in:  D36PAR

                                            Format                                  

                            Input Meaning          Output Meaning                   
          +------------------------------------------------------------------------+   /\   
   MDNXT  |                  Must be zero          Ptr to next MSD                 | QP.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
   MDPTR  |             ILDB ptr into msg          IDPB ptr into msg               |        
          |------------------------------------------------------------------------| 
   MDAUX  |                      Not used          ILDB ptr to beg of msg          |        
          |------------------------------------------------------------------------| 
   MDBYT  |            Bytes left to read          Bytes written so far            |        
          |------------------------------------------------------------------------| 
          | MDVMC  |                          |               MDALL                | *
          |        |                          |     Allocated length in bytes      | 
          |------------------------------------------------------------------------| 
   MDALA  |                  Allocated address of segment's data                   |        
          +------------------------------------------------------------------------+ 

           Field MDVMC     (0-2)   Virtual map context

                 VMC.XC=0  EXEC Context (Map through EPT)
                 VMC.US=1  USER Context (Map through UPT)
                 VMC.NO=2  DO NOT Map (Physical Address)




















                                    233
                               MONITOR TABLES


                                 MD-NIPAR

   MD is the Network Interconnect (NI) Message Segment Descriptor block.

   Defined in:  NIPAR

                                            Format                                  

                            Input Meaning          Output Meaning                   
          +------------------------------------------------------------------------+ /\
   MDNXT  |                 Must be zero          Ptr to next MSD                  | 1 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   MDPTR  |              ILDB ptr into msg          IDPB ptr into msg              |   
          |------------------------------------------------------------------------| 
   MDAUX  |                Not used          ILDB ptr to beg of msg                |   
          |------------------------------------------------------------------------| 
   MDBYT  |            Bytes left to read          Bytes written so far            |   
          |------------------------------------------------------------------------| 
          | MDVMC  |                          |               MDALL                | *
          |        |                          |     Allocated length in bytes      | 
          |------------------------------------------------------------------------| 
   MDALA  |                  Allocated address of segment's data                   |   
          +------------------------------------------------------------------------+ 

           Field MDVMC     (0-2)   Virtual map context

                 VMC.XC=0  EXEC Context (Map through EPT)
                 VMC.US=1  USER Context (Map through UPT)
                 VMC.NO=2  DO NOT Map (Physical Address)























                                    234
                               MONITOR TABLES


                                    MN

   MN represents the format of the DECnet-36 MENUVER field of the connect
   data.   This  field specifies what other connect data follows and what
   version of Session Control is running on the other node.

   Defined in:  SCPAR

                                            Format                                  

                                           MENUVER                                  
          +------------------------------------------------------------------------+ 
          | | |     |   |                                                          |
        * | | |     |   |                                                          |
          +------------------------------------------------------------------------+ 

           Field MNRPA     (0-0)   RQSTRID, PASSWRD, account fields are included

           Field MNUSR     (1-1)   USRDATA included

           Field MNRSV     (2-4)   Reserved field

           Field MNVER     (5-6)   Version of session control






























                                    235
                               MONITOR TABLES


                            MONITOR-STATISTICS

   This table is available through GTTAB and is used by WATCH and EXEC.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   SKDTM0: |      Time spent in SKDNUL with balance set empty      |
           |-------------------------------------------------------|
   SKDTM1: |    Time spent in SKDNUL with balance set non-empty    |
           |-------------------------------------------------------|
   SKDTM2: |             Time spent running scheduler              |
           |-------------------------------------------------------|
   SPTTIM: |             Time spend in pager trap code             |
           |-------------------------------------------------------|
   DRMRD:  |                 Number of drum reads                  |
           |-------------------------------------------------------|
   DRMWR:  |                 Number of drum writes                 |
           |-------------------------------------------------------|
   DSKRD:  |                 Number of disk reads                  |
           |-------------------------------------------------------|
   DSKWR:  |                 Number of disk writes                 |
           |-------------------------------------------------------|
   TTYBKS: |                 Number of tty wakeups                 |
           |-------------------------------------------------------|
   TTINTS: |             Number of terminal interrupts             |
           |-------------------------------------------------------|
   BSTSUM: |                 Integral of NBPROC DT                 |
           |-------------------------------------------------------|
   RJTSUM: |             Integral of NBPROC|NGOJOB DT              |
           |-------------------------------------------------------|
   RJAV:   |     Exponential average of number runnable forks      | / \
           |                                                       | NRJAVS
           |                                                       |  =3
           \                                                       \ \ /
           |-------------------------------------------------------|
   DSKWT:  |            Sum of process disk wait times             |
           |-------------------------------------------------------|
   DRMWT:  |            Sum of process drum wait times             |
           |-------------------------------------------------------|
   NTTYIN: |        Total number terminal input characters         |
           |-------------------------------------------------------|
   NTTYOT: |        Total number terminal output characters        |
           |-------------------------------------------------------|
   NGCCOR: |                    Count of GCCORs                    |
           |-------------------------------------------------------|
   GCCTIM: |                Integral of GCCOR time                 |
           |-------------------------------------------------------|
   NREMR:  |          Count of WS removals while runnable          |


                                    236
                               MONITOR TABLES
                         MONITOR-STATISTICS (Cont.)


           |-------------------------------------------------------|
   BSWT:   |               Sum of process wait times               |
           |-------------------------------------------------------|
   SKDOVH: |      Accumulated SCHED overhead time in HP units      |
           |-------------------------------------------------------|
   SKDIDL: |           Accumulated idle time in HP units           |
           |-------------------------------------------------------|
   SKDSWP: |        Accumulated swap-wait time in HP units         |
           |-------------------------------------------------------|
   USRTIM: |         Accumulated user time in milliseconds         |
           |-------------------------------------------------------|
   HQFSUM: |                 Integral of NGQFK DT                  |
           |-------------------------------------------------------|
   LQFSUM: |                 Integral of NLQFK DT                  |
           |-------------------------------------------------------|
   DWRWT:  |            Sum of process disk write wait             |
           |-------------------------------------------------------|
   NAJBAL: |             Number of forced AJBALS calls             |
           |-------------------------------------------------------|
   SNRSUM: |                  Integral of SUMNRN                   |
           |-------------------------------------------------------|
   RPQSUM: |                   Integral of NRPLQ                   |
           |-------------------------------------------------------|
   HSPTIM: |                  HP pager trap time                   |
           |-------------------------------------------------------|
   NCSWCH: |              Number of context switches               |
           |-------------------------------------------------------|
   BGNDTM: |       Time doing background stuff (TTCH7, ....)       |
           |-------------------------------------------------------|
   STRPCT: |                System total page traps                |
           |-------------------------------------------------------|
   SRPQSC: |            System total "saves" from RPLQ             |
           |-------------------------------------------------------|
   SGCCWR: |               Number writes from GCCOR                |
           |-------------------------------------------------------|
   NWSSUM: |            Integral of number WS in memory            |
           |-------------------------------------------------------|
   SKDFIL: |       Integral of wait time with out swap waits       |
           |-------------------------------------------------------|
   NWSLOD: |                   Count of WS loads                   |
           |-------------------------------------------------------|
   NREMJ:  |     Count of balance set removals while runnable      |
           |-------------------------------------------------------|
   SXGCWR: |                Number writes from XGC                 |
           |-------------------------------------------------------|
   TTWAKN: |              Terminal input wakeup count              |
           |-------------------------------------------------------|
   DSKRVC: |                    Skip reads count                   |
           |-------------------------------------------------------|
   CIPKSN  |                    CI Packets Sent                    |


                                    237
                               MONITOR TABLES
                         MONITOR-STATISTICS (Cont.)


           |-------------------------------------------------------|
   CIPKRC  |                  CI Packets Received                  |
           |-------------------------------------------------------|
   SCAOSN  |              SCA Overhead messages sent               |
           |-------------------------------------------------------|
   SCAORC  |             SCA Overhead messages received            |
           |-------------------------------------------------------|
   MSCSNT  |               MSCP Driver messages sent               |
           |-------------------------------------------------------|
   MSCRCV  |             MSCP Driver messages received             |
           |-------------------------------------------------------|
   SVSEND  |               MSCP Server messages sent               |
           |-------------------------------------------------------|
   SVRECV  |             MSCP Server messages received             |
           |-------------------------------------------------------|
   CFSSND  |                   CFS messages sent                   |
           |-------------------------------------------------------|
   CFSRCV  |                 CFS messages received                 |
           |-------------------------------------------------------|
   SCSJSN  |                  SCS% messages sent                   |
           |-------------------------------------------------------|
   SCSJRC  |                 SCS% messages received                |
           |-------------------------------------------------------|
   CMDQS   |                 CI Command Q usage  Q0                |
           |-------------------------------------------------------|
           |                 CI Command Q usage  Q1                |
           |-------------------------------------------------------|
           |                 CI Command Q usage  Q2                |
           |-------------------------------------------------------|
           |                 CI Command Q usage  Q3                |
           |-------------------------------------------------------|
   IPSND   |                    IP Datagrams sent                  |
           |-------------------------------------------------------|
   IPRCV   |                  IP Datagrams received                |
           |-------------------------------------------------------|
   DNASND  |                  DECnet Datagrams sent                |
           |-------------------------------------------------------|
   DNARCV  |                DECnet Datagrams received              |
           |-------------------------------------------------------|
   SCSJDS  |                  SCS% Datagrams sent                  |
           |-------------------------------------------------------|
   SCSJDR  |                 SCS% Datagrams received               |
           |-------------------------------------------------------|
   MSCDRC  |             MSCP Driver datagrams received            |
           |-------------------------------------------------------|
   HSCELP  |     HSCP Error-log datagrams received (PPD byte 5)    |
           +-------------------------------------------------------+





                                    238
                               MONITOR TABLES


                                  MSCCID

   This table keeps track of the current SCA  connect  id  of  each  MSCP
   driver connection.

   Defined in:     PHYMSC

   Index:          MSCP driver connect id

                                   Format

           +-------------------------------------------------------+  /|\
   MSCCID  |                    SCA connect-id                     |   |
           |-------------------------------------------------------|   |
           |                          .                            |   |
           |                          .                            | CTABSZ
           |                          .                            |   |
           /                          .                            /   |
           /                          .                            /   |
           |                          .                            |   |
           |-------------------------------------------------------|  \|/

   Notes:  Zero indicates unused.
           -1,,-1 indicates an entry that is no longer connected.
           Anything else is a valid connect id.




























                                    239
                               MONITOR TABLES


                                  MSCINT

   This table describes the time-out interval to wait for an MSCP  driver
   connect id.

   Defined in:     PHYMSC

   Index:          MSCP driver connect id

           +-------------------------------------------------------+  
   MSCINT  |                 Time-out interval                     |  / \
           |-------------------------------------------------------|   |
           |                                                       |   |
           |                                                       |   |
           /                                                       / CTABSZ
           /                                                       /   |
           |                                                       |   |
           |                                                       |   |
           |-------------------------------------------------------|  \ /


































                                    240
                               MONITOR TABLES


                                  MSCOLD

   This table contains old connect id  values  for  driver  MSCP  and  is
   mainly for recovery purposes.

   Defined in:     PHYMSC

   Index:          MSCP driver connect-id

           +-------------------------------------------------------+   
   MSCOLD  |                   SCA connect-id                      |   / \
           |-------------------------------------------------------|    |
           |                                                       |    |
           |                                                       |    |
           /                                                       /  CTABSZ  
           /                                                       /    |
           |                                                       |    |
           |                                                       |    |
           |-------------------------------------------------------|   \ /

   Notes:  See MSCCID.
































                                    241
                               MONITOR TABLES


                        MSCP SERVER COMMAND HEADER

   This header resides within the invisible SYSAP area of an SCA  message
   and contains command-specific information for the MSCP server.

   Defined in:     PHYMVR

              +-------------------------------------------------------+
   .QCRTN=-13 |            Return address for this command            |
              |-------------------------------------------------------|
   .QCNXT=-12 |            Pointer to next queued command             |
              |-------------------------------------------------------| 
   .QCLST   . |          Pointer to previous queued command           |
              |-------------------------------------------------------|
   .QCPID   . |                Virtual page for I/O                   |
              |-------------------------------------------------------| 
   .QCSTS   . |                        Status                         | *
              |-------------------------------------------------------|
   .QCIOR     |                     IORB address                      |
              |-------------------------------------------------------|
   .QCDBD     |                     Buffer name                       |
              |-------------------------------------------------------|
   .QCTMO     |                    Time-out time                      |
              |-------------------------------------------------------|
   .QCDBG     |                       Unused                          |
              |-------------------------------------------------------|
   .QCRT2     |      Return address for returning packet to SCA       |
              |              if the command is queued                 |
              +-------------------------------------------------------+

                0  1  2  3      8 9        17 18                     35
              +-------------------------------------------------------+
   .QCSTS     |  |  |  |         |          |                         |
              +-------------------------------------------------------+

               Symbol    Bits    Meaning

               MS.COQ      0     Command is queued

               MS.ABT      1     Command is aborted

               MS.CTO      2     Command is timed out











                                    242
                               MONITOR TABLES
                     MSCP SERVER COMMAND HEADER (Cont.)


               QCSTS     3-8     Command state, which can be:

                       STCMD==0   Treat as incoming command
                       STWAE==1   Waiting to allocate end
                       STWSR==2   Waiting to send data (retryable)
                       STWRR==3   Waiting to request data (retryable)
                       STWSE==4   Waiting to send end packet (IO only) state
                       STWSD==5   Wait for send data state
                       STWRD==6   Wait for receive data state
                       STIAC==7   IORB active (IO only) state
                       STWSB==10  Waiting to send buffer (IO only) state
                       STWRB==11  Waiting to request buffer (IO only) state

               QCCNT     18-35   Timed retry counter






































                                    243
                               MONITOR TABLES


                            MSCP SERVER STORAGE

   This storage  contains  variables  used  by  the  MSCP  server  module
   (PHYMVR).

   Defined in:     STG, PHYMVR

           +-------------------------------------------------------+
   SVSTSW: |                     Status Word                       | *
           |-------------------------------------------------------|
   SVSLSX: |            Index into SCDBTB for listener             |
           |-------------------------------------------------------|
   SRVCHK: |               Flags for periodic check                |
           |-------------------------------------------------------|
   SRVCKT: |                  Next time to check                   |
           |-------------------------------------------------------|
   SVIRBH: |                    First free IORB                    |
           |-------------------------------------------------------|
   SVBDKN: |            # of disks to broadcast Online             |
           |-------------------------------------------------------|
   SVILCM: |                 # of illegal commands                 |
           |-------------------------------------------------------|
   SVLCMO: |           Last server command routine address         |
           |-------------------------------------------------------|
   SVPKIU: |                  # of packets in use                  |
           |-------------------------------------------------------|
   SVMKIU: |                Max # of packets in use                |
           |-------------------------------------------------------|
   SVCMIU: |                  # of commands in use                 |
           |-------------------------------------------------------|
   SVMCIU: |               Max # of commands in use                |
           |-------------------------------------------------------|
   SVIPIU: |                    I/O pages in use                   |
           |-------------------------------------------------------|
   SVMPIU: |                  Max I/O pages in use                 |
           |-------------------------------------------------------|
   SVBKNS: |         Times requed because of nsked events          |
           |-------------------------------------------------------|
   SVCMDL: |               Table of command counts                 |  /|\
           |                 (parallel to MSSDSP)                  |   |
           |                                                       | NMSFCN
           |                                                       |   |
           \                                                       \  \|/
           |-------------------------------------------------------|
   SVCMRT: |            Table of retried command counts            |
           |                 (parallel to MSSDSP)                  |
           |                                                       |
           |                                                       |
           \                                                       \
           +-------------------------------------------------------+



                                    244
                               MONITOR TABLES
                        MSCP SERVER STORAGE (Cont.)


             0  1  2                                             35
           +-------------------------------------------------------+
   SVSTSW: |  |  |  |                                              |
           +-------------------------------------------------------+

               Symbol    Bits    Meaning

               SVSINF     0      Server has been initialized
               SVSILB     1      Do not issue more MSSCGL BUGINFs
               SVSLIS     2      OK to open a listener










































                                    245
                               MONITOR TABLES


                                  MSCTMO

   This is the time left to wait for a remote MSCP driver connection.

   Defined in:     PHYMSC

   Index:          MSCP driver connect-id

           +-------------------------------------------------------+  / \
   MSCTMO  |                     Time left                         |   |
           |-------------------------------------------------------|   |
           |                                                       |   |
           |                                                       |   |
           /                                                       / CTABSZ
           /                                                       /   |
           |                                                       |   |
           |                                                       |   |
           +-------------------------------------------------------+  \ /



































                                    246
                               MONITOR TABLES


                                    MT

   NI Multi-cast address block.  There is a  block  for  each  Multi-cast
   address  that  has  been  enabled for the NI port.  Multi-cast address
   blocks are allocated at location MCTADR.  There are NMTT  (16)  blocks
   in  the  table.   The  word MTUSE contains the number of NI multi-cast
   address blocks currently in  use.   The  beginning  of  the  table  is
   pointed  to  by  channel  block  word  PSMTT, that is, PSMTT points to
   MCTADR.

   Defined in:  PHYKNI

                                            Format                                  

          +------------------------------------------------------------------------+ 
   MTHAD  |                           High order address                           | 
          |------------------------------------------------------------------------| 
          |                                 MTLAD                                  | *
          |                           Low order address                            |
          +------------------------------------------------------------------------+ 

           0                                                                  34 35
          +------------------------------------------------------------------------+
   MTLAD  |                                                                     |  |
          +------------------------------------------------------------------------+

        Bit     Symbol     Contents

        35      MTENA      Enable bit
























                                    247
                               MONITOR TABLES


                             MTA-STORAGE-AREA

   Magtape storage area; each entry  (unless  otherwise  noted)  is  MTAN
   words  long  where  MTAN  equals  the  number  of magtape units on the
   system.

   Defined in:  STG

                                   Format
           +-------------------------------------------------------+ / \
   MTALCK: \                       Lock Word                       \ MTAN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   MTASTS: \                    Status of Unit                     \ MTAN
           |-------------------------------------------------------| \ /
   MTANR1: |           Nonresident Storage for Magtape             | / \
           |                                                       | MTAN
           \-------------------------------------------------------\ \ /
   MTANR2: |           Nonresident Storage for Magtape             | / \
           |                                                       | MTAN
           \-------------------------------------------------------\ \ /
   MTANR3: |           Nonresident Storage for Magtape             | / \
           |                                                       | MTAN
           \-------------------------------------------------------\ \ /
   MTANR4: |           Nonresident Storage for Magtape             | / \
           |                                                       | MTAN
           \-------------------------------------------------------\ \ /
   MTANR5: |           Nonresident Storage for Magtape             | / \
           |                                                       | MTAN
           \-------------------------------------------------------\ \ /
   MTANR6: |           Nonresident Storage for Magtape             | / \
           |                                                       | MTAN
           \                                                       \ \ /
           |-------------------------------------------------------|*/ \
   MTARS1: \             Resident Storage for Magtape              \ MTAN
           |-------------------------------------------------------| / \
   MTPSFK: \            PSI            |          Fork #           \ MTAN
           |-------------------------------------------------------| \ /
   MTCUTB: |         CDB Table         |         UDB Table         | / \
           \                           |       (1 Entry/UDB)       \ MTAN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   MTAPBF: |            Space for Buffer Page Pointers             | MTPBFL=
           |                                                       |MTBUFN*MAXPPB
           \                                                       \ +MTAN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   MTIRBF: |                    Space for IORBs                    | MTABFL=
           |                                                       | MTAN*MTBUFN*
           \                                                       \ MTIRBL



                                    248
                               MONITOR TABLES
                          MTA-STORAGE-AREA (Cont.)


           |-------------------------------------------------------| \ /
           |                                                       | / \
   MTIOWD: \                IOWD for Next Transfer                 \ MTAN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   MTBIOW: \            Backup IOWD for Next Transfer              \ MTAN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   MTAOLS: \  Length of last Xfer      |                           \ MTAN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   MTARCE: \                   Total Error Count                   \ MTAN
           |-------------------------------------------------------| \ /
   REWCNT: |               Number of Rewinding Units               | 
           |-------------------------------------------------------|  
   MTERAS: |                 Rewrite Erase Counter                 |
           |-------------------------------------------------------|
   MTPNTR: |                 IOWD During Transfer                  |
           |-------------------------------------------------------|
   MTAUNT: |         Unit Currently Attached to Controller         |
           |-------------------------------------------------------|
   MTERRC: |                     Retry Counter                     |
           |-------------------------------------------------------|
   MTERFL: |                    State of Retry                     |
           |-------------------------------------------------------|
   MTACOM: |            CONO Word of Current Operation             |
           |-------------------------------------------------------|
   MTDINR: |           Return Address for Data Interrupt           |
           |-------------------------------------------------------|
   MTACLS: |      Clock Routine Switch, 0 for No Clock Wanted      |
           |-------------------------------------------------------| / \
   TLABBP: \               PNTR to Locked Buffer Page              \ 2*MTAN
           |-------------------------------------------------------| \ /
   TLABR0: |                            |  RCNT                    | / \
           \        Resident flags      |    Record count info     \ MTAN
           |-------------------------------------------------------| \ /
   MTAJB0: |         JOB 0 flag for MTA unit came on line          |
           +-------------------------------------------------------+














                                    249
                               MONITOR TABLES
                          MTA-STORAGE-AREA (Cont.)


   The following MTA storage items are in the  nonresident  area  of  the
   monitor and each item is MTAN words long.

            0                        17 18                       35
           +-------------------------------------------------------+*/ \
           |                           |  MTRS                     | MTAN
   MTANR1: \   Flags, Density, Mode    |  Rec size in Hdw. Bytes   \ \ /
           |-------------------------------------------------------| / \
           |  MTBYT                    |  MTBUF                    | MTAN
   MTANR2: \   Initial LH of FILBYT    | Ptr. to Buffer Pages List \ \ /
           |-------------------------------------------------------| / \
           | 0     5|6     11|12     17|18    23|                  |  |
           | MTHBW  | MTUBW  | MTCSB   | MTCUB  |                  |  |
   MTANR3: |Hdw.Byts|UserByts|Current  | Current|                  | MTAN
           | Per Wd | Per Wd |Service  | User   |                  |  |
           |        |        |Routine  | Buffer |                  |  |
           |        |        |Buffer   |        |                  | \ /
           |-------------------------------------------------------| / \
           |  MTCIRB                   |  MTCUP                    |  |
   MTANR4: \    Current IORB in Use    |     Current User Page     \ MTAN
           |-------------------------------------------------------| \ /
           |  MTUBB                    |  MTUBP                    | / \
   MTANR5: \   User Bytes per Buffer   |    User Bytes per Page    \ MTAN
           |-------------------------------------------------------| \ /
           |  MTALTC                   |  MTLIRB                   | / \
   MTANR6: \    Last Transfer Count    | Last Dump Mode IORB Adr.  \ MTAN
           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   TLABL0: \                         Flags                         \ MTAN
           |-------------------------------------------------------| \ /
           |  TPERM                    |  TPFRK                    | / \
   TLABL1: \   Error codeset by MTCON  |     Tape fork for PSI     \ MTAN
           |-------------------------------------------------------| \ /
           |  TPJFN                    |  TPLBLS                   | / \
   TLABL2: \         Saved JFN         | Tape label buffers in SWAP\ MTAN
           |-------------------------------------------------------| \ /
           |  FSSAV                                                | / \
   TLABL3: \               Place to save file status               \ MTAN
           |-------------------------------------------------------| \ /
           |     flags, section #      |  TPMTRS                   |*/ \
   TLABL4: \                           |    Place to save Rec Size \ MTAN











                                    250
                               MONITOR TABLES
                          MTA-STORAGE-AREA (Cont.)


           |-------------------------------------------------------| \ /
           |                                                       |*/ \
   TLABL5: \                  Tape position info                   \ MTAN
           |-------------------------------------------------------| \ /
           |  TPBSZ                    |  TPRSZ                    | / \
   TLABL6: \       File blocksize      |     File record size      \ MTAN
           |-------------------------------------------------------| \ /
           |  TPSCUP                   |  TPIOB                    | / \
   TLABL7: |  Saves Cur. pg. PTR for   |    I/O buffer address     | MTAN
           \   TPSBYT                  |                           \ \ /
           |-------------------------------------------------------| / \
           |  SVIOS                                                |  |
   TLABL8: \                   Place to save IOS                   \ MTAN
           |-------------------------------------------------------| \ /
           |  SVBLK                                                | / \
   TLABL9: \              Place to save black address              \ MTAN
           |-------------------------------------------------------| \ /
           |  TPLRC                    |  TPPRO                    |*/ \
   TLAB10: \       Local Status        |        Protection         \ MTAN
           |-------------------------------------------------------| \ /
           |  TPOCT                    |  TPOBY                    | / \
   TLAB11: \       old TPFCNT          |        old TPFBYN         \ MTAN
           |-------------------------------------------------------| \ /
           |  TPFSN                                                | / \
   TLAB12: \                Sixbit volume set name                 \ MTAN
           |-------------------------------------------------------| \ /
           |  TPEXPD                                               | / \
   TLAB13: \                   Expiration date                     \ MTAN
           |-------------------------------------------------------| \ /
           |                                                       | / \
   TLAB14: \                   Sequence Numbers                    \ MTAN
           |-------------------------------------------------------| \ /
   TPFCNT: |                      MT filcnt                        | / \
           \                                                       \ MTAN
           |-------------------------------------------------------| \ /
   TPFBYN: |                      MT filbyn                        | / \
           \                                                       \ MTAN
           |-------------------------------------------------------| \ /
   TPFLEN: |                      MT fillen                        | / \
           \                                                       \ MTAN
           |-------------------------------------------------------| \ /
   TPFLNX: |        Count of Bytes Expected in next Record         | / \
           \                                                       \ MTAN
           |-------------------------------------------------------| \ /
   TPSBYT: | Pointer to where JCW should go when record is complete| / \
           \                                                       \ MTAN
           +-------------------------------------------------------+ \ /





                                    251
                               MONITOR TABLES
                          MTA-STORAGE-AREA (Cont.)


            0 1 2 3 4 5 6 7 8 9  17 8 9 0 1 2 3 4 5 6 7 8 29 1 2 35
           +-------------------------------------------------------+
   MTASTS  | | | | | | | | | | |   | | | | | | | | | |   |    | |  |
   entry   +-------------------------------------------------------+


                  Symbol   Bits        Content

                  OPN        0         Unit has been opened
                  OPND       2         Unit has been opened for
                                        dum mode
                  DMPWT      3         Waiting for a dump mode
                                        operation to finish
                  LTERR      4         Error Occurred on last
                                        dump mode operation
                  BUFA       5         Buffers have been assigned
                  CLOF       6         CLOSF in progress
                  MTOWT      7         MTOPR in progress
                  MTIELW     8         Inhibit error logging
                  MTNOWT     9         Do not set MTOWT
                  MT%ILW    18         Write lock
                  MT%DVE    19         Hardware device error
                  MT%DAE    20         Data error
                  MT%SER    21         No error retry
                  MT%EOF    22         EOF
                  MT%IRL    23         Illegal record length
                  MT%BOT    24         Beginning of tape
                  MT%EOT    25         Physical end of tape
                  MT%EVP    26         Even Parity
                  MT%DEN   27-28       Density (0 is normal)
                                       .MTLOD=1 Low Density
                                        (200 BPI)
                                       .MTMED=2 Medium Density
                                        (556 BPI)
                                       .MTHID=3 High Density
                                        (800 BPI)
                  MT%CCT   29-31       Character Counter
                  MT%NSH    32         Mode or density not supported
                                        by hardware













                                    252
                               MONITOR TABLES
                          MTA-STORAGE-AREA (Cont.)


            0                                19 20 21   29 30    35
           +-------------------------------------------------------+
   MTARS1  |                                    | | MTPPB |MTNIR/  |
   entry   |                                    | |       |  MTANIR|
           +-------------------------------------------------------+


                  Bits     Pointer     Content

                   20      ABORTF      An error occurred and IORBs 
                                        aborted
                  21-29    MTPPB       Number of pages per buffer
                  30-35    MTNIR       Number of IORBs queued
                  30-35    MTANIR      Absolute version of MTNIR


            0 1 2     8 9 10 11 12  14 15  17 18                 35
           +-------------------------------------------------------+
   TLABR0  | | |       | |  |  |      |      |                     |
   entry   +-------------------------------------------------------+


                  Bits     Pointer     Content

                    0      TPVV        Volume valid flag
                    1      TPNVV       Tape not valid
                   2-8     TPUNIT      Actual mta unit
                    9      SNEOT       EOT seen while writing labels
                   11      TPEDB       EBCDIC Volume
                  12-14    TPMTDM      Place to save data mode
                  15-17    TPMHBW      Place to save bytes/wd
                  18-35    RCNT        Record count info


            0 1 2    5 6 7 8  10 11  14 15  17 18                35
           +-------------------------------------------------------+
   MTANR1  |   |MTFCN | | |MTSTC| MTDN |MTDM  |        MTRS        |
   entry   +-------------------------------------------------------+


                  Bits     Pointer     Content

                   0-1     MTNTM       Count of EOFs written
                   2-5     MTFCN       Last function performed
                    6      MTPAR       Parity
                    7      MTRBF       Reading backwards flag
                   8-10    MTSTC       CLOSF function counter
                  11-14    MTDN        Density
                  15-17    MTDM        Data mode
                  18-35    MTRS        Record size in hardware bytes


                                    253
                               MONITOR TABLES
                          MTA-STORAGE-AREA (Cont.)


            0   5 6  12 3 4 5 6 7 8 9 0 1 2 3 4 25  27 28 31 32  35
           +-------------------------------------------------------+
   TLABL0  |     |     | | | | | | | | | | | | |      |     |      |
   entry   +-------------------------------------------------------+


                  Bits     Pointer     Content

                   0-5     TPSTAT      State code
                   6-12    TPLPCS      Label processing code
                    13     TPBEGF      Set if beginning of spanned record
                    14     TPNBL       New block read
                    15     TPUED       Use EBCDIC data if set
                    16     TPFVM       If set, first volume is mounted
                    17     TPLCT       User label count
                    18     HDR1        HDR1 data valid
                    19     HDR2        HDR2 data valid
                    20     RCCHK       Record count check error (TLRCHK)
                    21     TPEOF       EOF 1/2 seen in TLRCHK (also EOV)
                    22     TPT20       TOPS-20 volume
                    23     UVLD        UVLD data valid
                    24     TPLBD       Unlabeled/labeled operation
                  25-27    TPDNS       MTA density - declared by MTCON
                  28-31    TPNUL       # of user labels written


            0 1 2 3       8 9      17 18                         35
           +-------------------------------------------------------+
   TLABL4  | | | |  TPPSI  | TPFSEC  |          TPMTRS             |
   entry   +-------------------------------------------------------+


                  Bits     Pointer     Content

                    0      TPEUT       End of user labels encountered
                    1      TPAPP       Open for append
                    2      TPDPN       MT opened
                   3-8     TPPSI       Tape PSI for EOV
                   9-17    TPFSEC      File section number
                  18-35    TPMTRS      Place to save record size












                                    254
                               MONITOR TABLES
                          MTA-STORAGE-AREA (Cont.)


            0   4 5 6     11 12 13 14   17 18      26 27         35
           +-------------------------------------------------------+
   TLABL5  |     | |        |     |       |          |             |
   entry   +-------------------------------------------------------+


                  Bits     Pointer     Content

                    5      TPDVS       Defer volume switch if set
                   6-11    TPFRMT      Record format type code
                  12-13    TPMOD       Tape mode
                  14-17    TPRVN       Relative volume number
                  18-26    FSEQ        Tape file position (seq. #)
                  27-35    USRSEQ      User requested seq. #


            0 1 2                   17 18                        35
           +-------------------------------------------------------+
   TLABL10 |   |        TPLRC         |           TPPRO            |
   entry   +-------------------------------------------------------+


                  Bits     Pointer     Content

                   0-1     TPXLB       Extra label count
                   2-17    TPLRC       Count of last read record
                   0-17    TPGDS       Local status
                  18-35    TPPRO       Save protection here
























                                    255
                               MONITOR TABLES


                                  MTCUTB

   This table contains the address of the CDB and the UDB for  each  tape
   drive on the system or the entry contains a zero if the drive does not
   exist.

   Defined in:  STG

   Index:  Tape drive number


                                   Format

           +-------------------------------------------------------+
   MTCUTB: |            CDB            |            UDB            | / \
           +-------------------------------------------------------+  |
           |                           .                           |  |
           |                           .                           | MTAN
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \ \ /
           +-------------------------------------------------------+































                                    256
                               MONITOR TABLES


                                  NAMUTP

   Name Unit Type Pointers.  This table contains pointers  to  unit  type
   names for disks (RP06, RM03, ...) and magtapes (TU45, TU77, ...).

   Defined in:  PHYSIO

                                   Format

           +-------------------------------------------------------+
   NAMUTP: |         POINT 7,[ASCIZ/ (Illegal Type: 0) /]          |
           |-------------------------------------------------------|
           |                 POINT 7,[ASCIZ/RP04/]                 |
           |-------------------------------------------------------|
           |                           .                           |
           |                           .                           |
           |                           .                           |
           \                           .                           \
           +-------------------------------------------------------+


































                                    257
                               MONITOR TABLES


                                    NE

   This is the DECnet network event block.   An  NE  block  contains  all
   information about an event.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   NENXT  |                   Pointer to next NE block on queue                    |        
          |------------------------------------------------------------------------| 
   NETIM  |                             Time of event                              |        
          |------------------------------------------------------------------------| 
   NECBK  |                      Address of callback routine                       |        
          |------------------------------------------------------------------------| 
   NEECP  |                 Pointer to event communications block                  |        
          |------------------------------------------------------------------------| 
          |          NECCL          |  NECTY  |               NEDLN                |
          |       Event class       |  Event  |       Data length in bytes         |
          |                         |  type   |                                    |
          |------------------------------------------------------------------------| 
          |               NEETP               |                                    |
          |            Entity type            |                                    |
          |------------------------------------------------------------------------| 
   NEEID  |                               Entity ID                                |        
          |------------------------------------------------------------------------| 
   NEDAT  |                    Fullword pointer to data string                     |        
          +------------------------------------------------------------------------+ 
























                                    258
                               MONITOR TABLES


                                    NF

   This is the  DECnet  NMX  Interface  Function  Argument  Block,  whose
   purpose  is  to implement a standard calling interface between Network
   Management (NTMAN) and the DECnet Layers.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   NFEID  |                               Entity ID                                |        
          |------------------------------------------------------------------------| 
          |               NFBYT               |               NFPRM                |
          |            Byte count             |         Parameter Number           |
          |------------------------------------------------------------------------| 
          | | | |   NFETY   |      NFSEL      |               NFBLN                | *
          | | | |Entity Type|    Selector     |           Buffer Length            |
          |------------------------------------------------------------------------| 
   NFQUA  |                               Qualifier                                |        
          |------------------------------------------------------------------------| 
   NFBUF  |                   Buffer Address or Parameter value                    |        
          |------------------------------------------------------------------------| 
   NFBPT  |                          Byte pointer to data                          |        
          +------------------------------------------------------------------------+ 

           Field NFBFF     (0-0)   Buffer Flag   

           Field NFUBF     (1-1)   User Buffer passed (for return KNOWN NODES)

           Field NFQUF     (2-2)   Qualifier Flag






















                                    259
                               MONITOR TABLES


                                    NM

   This is the Network Services Section of a DECnet message.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
        * | | | |     |         NMSGN         |      NMMGF      |      NMCNT       |
          |   NMFLG   |Message segment number |The MSGFLG field | Number of times  |
          |           |                       |of the NSP header|   we've sent     |
          |           |                       |                 |     message      |
          |------------------------------------------------------------------------| 
   NMTIM  |                               Time stamp                               |                
          |------------------------------------------------------------------------| 
   NMPRT  |                         Pointer to port block                          |                
          |------------------------------------------------------------------------| 
          |               NMLLA               |               NMRLA                |
          |        Local link address         |        Remote link address         |
          |------------------------------------------------------------------------|   /\   
   NMMSD  |                             Space for MSD                              | MD.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   NMORQ  |                             ORQ queue link                             | QP.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
   NMMAG  |                         Magic word for DTESRV                          |        
          |------------------------------------------------------------------------|       /\       
   NMHDR  |                            NSP header room                             | <<NMH.LN+3>/4> 
          \                                                                        \       \/       
          |------------------------------------------------------------------------| 
   NMMK1  |                               First mark                               |                
          |------------------------------------------------------------------------| 
   NMMK2  |                              Second mark                               |                
          +------------------------------------------------------------------------+ 

           For field NMFLG(0-5):
                   NMACK      0    Needs to be ACKed
                   NMRET      1    Return msg to SC
                   NMDLY      2    ACK delay allowed












                                    260
                               MONITOR TABLES


                                    NN

   The DECnet node block contains all the information LLINKS has to  know
   about a node.  There is a node block for all nodes that we have active
   links to.  The node block is created when someone tries to connect  to
   a node that does not yet have a node block associated with it.

   When the number of active links  goes  to  zero,  the  node  block  is
   subject  to possible deletion.  If the number of node blocks is larger
   than NNDMAX, then the now unused  node  block  is  deleted  after  its
   counters are logged with a 3.2 (database reused) event.

   The list of node blocks is pointed to by the queue header NMXNDQ.

   Note that many counters are full words, even though they only have  to
   be  16  bits  wide.   This  is  so  the OPSTR logic generates a single
   read-modify-write instruction when updating them  and  spares  us  the
   worry of interlocking this data base.

   Defined in:  LLINKS

                                            Format                                  

                                      NETWORK NODE BLOCK                            
          +------------------------------------------------------------------------+   /\   
   NNNXT  |                         Ptr to next node block                         | QP.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
   NNTLZ  |                  Time (from DNGTIM) when last zeroed                   |        
          |------------------------------------------------------------------------| 
          | | | |                             |               NNNOD                |
          |   | |                             | Network node ID (2 bytes) (HWORD   | *
          |   | |                             |            for speed)              |
          |------------------------------------------------------------------------| 
   NNTMC  |                        Message timeouts to node                        |        
          |------------------------------------------------------------------------| 
   NNRBC  |                     User bytes received from node                      |        
          |------------------------------------------------------------------------| 
   NNXBC  |                     User bytes transmitted to node                     |        
          |------------------------------------------------------------------------| 
   NNRMC  |                      User msgs received from node                      |        
          |------------------------------------------------------------------------| 
   NNXMC  |                     User msgs transmitted to node                      |        
          |------------------------------------------------------------------------| 
   NNTBR  |                  Total # of bytes received from node                   |        
          |------------------------------------------------------------------------| 
   NNTBX  |                  Total # of bytes transmitted to node                  |        
          |------------------------------------------------------------------------| 
   NNTMR  |                 Total # of messages received from node                 |        
          |------------------------------------------------------------------------| 
   NNTMX  |                 Total # of messages received from node                 |        


                                    261
                               MONITOR TABLES
                                 NN (Cont.)


          |------------------------------------------------------------------------| 
   NNRCC  |                    Connect inits received from node                    |        
          |------------------------------------------------------------------------| 
   NNXCC  |                   Connect inits transmitted to node                    |        
          |------------------------------------------------------------------------| 
   NNRRC  |                       Rejects received from node                       |        
          |------------------------------------------------------------------------| 
   NNXRC  |                      Rejects transmitted to node                       |        
          |------------------------------------------------------------------------| 
   NNLKC  |                      Current active links to node                      |        
          |------------------------------------------------------------------------| 
   NNLKM  |                        Max active links to node                        |        
          |------------------------------------------------------------------------| 
   NNCRC  |                    Connect resource errors received                    |        
          |------------------------------------------------------------------------| 
   NNDLY  |                   Estimated round-trip delay (msecs)                   |        
          |------------------------------------------------------------------------| 
   NNSLZ  |                 Seconds since last zeroed (time stamp)                 |        
          |------------------------------------------------------------------------| 
   NNPSZ  |              Pipe size (= 3 * last message's visit count)              |        
          +------------------------------------------------------------------------+ 

           For field NNFLG(0-1):
                   NNGDL      0    Set if we've "got delay", see UPDELAY

           Field NNMSG     (2-2)   Set if we've sent a 'link broken' message  
                                   for this node

























                                    262
                               MONITOR TABLES


                                 NO-SCLINK

   The NO defines a single  node  in  a  bucket  in  the  DECnet-36  node
   name/number data base.

   Defined in:  SCLINK

                                            Format                                  

                                   Represents a single node                         
          +------------------------------------------------------------------------+ 
   NONAM  |                               Node name                                |                 
          |------------------------------------------------------------------------| 
   NOADR  |                              Node address                              |                 
          +------------------------------------------------------------------------+ 






































                                    263
                               MONITOR TABLES


                                 NO-SCPAR

   There is one node name block for each node.  Node name blocks are kept
   on  doubly  linked  lists,  with  the  head  of  each list in a vector
   MAX-NODES long.

   Defined in:  SCPAR

                                            Format                                  

                                          Node name                                 
          +------------------------------------------------------------------------+ 
   NONXT  |                          POINTER TO NEXT NODE                          |                
          |------------------------------------------------------------------------| 
   NOLST  |                          POINTER TO LAST NODE                          |                
          |------------------------------------------------------------------------| 
   NOCID  |                   CIRCUIT ID USED ONLY FOR LOOPBACK                    |                
          |------------------------------------------------------------------------| 
   NOCNT  |  COUNT OF BYTES IN NODE NAME  (DOESN'T NEED FULL WORD, REST IS FREE)   |                
          |------------------------------------------------------------------------|      /\     
   NONAM  |                             NODE NAME TEXT                             | <<^D6+3>/4> 
          \                                                                        \      \/     
          +------------------------------------------------------------------------+ 






























                                    264
                               MONITOR TABLES


                                    NR

   The NR is the NRT (Network Remote Terminal) Data Block (also  referred
   to  as  the NRB).  One block is allocated for each active link to hold
   data associating the DECnet link with a terminal data block (TDB).

   Defined in:  NRTSRV

                                            Format                                  

          +------------------------------------------------------------------------+ 
   NRTDB  |                     Dynamic ptr to associated TDB                      | 
          |------------------------------------------------------------------------| 
          | | | | | | |         NRCHN         |               NRSTS                | *
          |   NRFLG   | DECnet channel number |   Current status of DECnet link    |
          |------------------------------------------------------------------------| 
   NRSJB  |                       Pointer to this link's SJB                       | 
          |------------------------------------------------------------------------| 
          |               NRSIZ               |               NRPSI                |
          |Max chars in a segment on this link|  SCJSYS's original PSI mask for    |
          |                                   |           NETUSER link             |
          |------------------------------------------------------------------------| 
          |               NRRID               |               NRINA                |
          |          Remotes node ID          | Inactivity timer for NETHOST link  |
          +------------------------------------------------------------------------+ 

           For field NRFLG(0-5):
                   NRCFG      0    Set if config msg has been sent
                   NRREL      1    This NRB is being released
                   NRUSR      2    0=Nethost link, 1=User netlink
                   NRTRN      3    This NRB is in transition
                   NRDEA      4    Deallocate TDB





















                                    265
                               MONITOR TABLES


                                    NT

   The NT structure defines the format of the data blocks that  are  used
   to store the characteristics, counters, and states associated with the
   network management  entities;  these  entities  are  nodes,  circuits,
   lines,  and  modules.   The blocks are also passed between the various
   layers of DECnet for the purpose of setting  and  reading  parameters,
   and reading counters.

   Defined in:  NTMAN

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | NTTYP |  NTLEN  |   NTROU   | | | | | | |            NTQUA             |
          | Data  | Length  | Index to  |   NTDEV   | Qualifier Parameter Number   | *
          | type  |         |routine to |           |                              |
          |       |         |   call    |           |                              |
          |------------------------------------------------------------------------| 
          | | | | | | | | | | |   | |       NTBSZ       |          NTSEQ           |
          | NTAPL |   NTINF   |   | |Buffer size needed |Sequence or type of field | *
          |       |           |   | |    (if needed)    |                          |
          +------------------------------------------------------------------------+ 
           
           For field NTTYP(0-4):
                   NT.FC      1    Coded format
                   NT.FCM     2    Coded multiple (this means special casing)
                   NT.FAI     3    ASCII image (8-bit)
                   NT.FDU     4    Decimal, unsigned.  Cannot be zero.
                   NT.FDS     5    Decimal, signed
                   NT.FH      6    Hex integer
                   NT.FHI     7    Hex image
                   NT.FOC     8    Octal
                   NT.FDM     9    Internal data type only.  Decimal, milliseconds.
                   NT.FVN     10   Internal data type only.  Version number.
                   NT.FNE     11   Internal data type only.  Node entity ID.
                   NT.FNN     12   Internal data type only.  ASCII node name
                   NT.FCN     13   Internal data type only.  ASCII circuit name

           For field NTDEV(15-20):
                   NTD.R      15   DMR-11
                   NTD.N      16   Ethernet (KLNI)
                   NTD.C      17   Computer Interconnect (KLPI)
                   NTD.P      18   DDP
                   NTD.K      19   KDP
                   NTD.D      20   DTE-20 (UGH)







                                    266
                               MONITOR TABLES
                                 NT (Cont.)


           For field NTAPL(0-3):
                   NTA.E      0    Executor
                   NTA.L      1    Loop nodes
                   NTA.R      2    Remote nodes
                   NTA.H      3    Home area nodes only

           For field NTINF(4-9):
                   NTI.C      4    Characteristics (listed in spec as 'C')
                   NTI.S      5    Status (listed in spec as 'S')
                   NTI.%      6    Summary (listed in spec as '*')
                   NTI.K      7    Circuit State
                   NTI.Q      8    This parameter is qualified
                   NTI.N      9    None. noop bit, not necessary

           Field NTSET     (10-11) Settability restrictions

                   NTS.       0    0 means read and write
                   NTS.R      1    Read only parameter
                   NTS.W      2    Write only parameter

           Field NTBUF     (12-12) Buffer Field































                                    267
                               MONITOR TABLES


                                  NTCTAB

   Network topology change fork table.  This is the table used to  notify
   user processes of topology changes on the network.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   NTCTAB: |        Fork number        |     Interrupt channel     | / \
           +-------------------------------------------------------+  |
           |                           .                           |  |
           |                           .                           | NTCMAX
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \ \ /
           +-------------------------------------------------------+



































                                    268
                               MONITOR TABLES


                                    NX

   NX is block of "globals" used by DECnet NMX.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | | | | | | | |   |     |     |     |               NXPRM                |
          |    NXFLG    |   |     |     |     |   Parameter/counter identifier     | *
          |------------------------------------------------------------------------| 
   NXNUM  |             Entity sequence number. (Node addr of line ID)             |        
          |------------------------------------------------------------------------| /\
   NXVAL  |                     Maximum string size (32 bytes)                     | 8 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   NXMBY  |                        Maximum number of bytes                         |   
          |------------------------------------------------------------------------| 
   NXADR  |                 User virtual address of argument block                 |   
          |------------------------------------------------------------------------| 
   NXUUO  |                  Saved calling UUO (need for STOTAC)                   |   
          |------------------------------------------------------------------------|   /\   
   NXEID  |                      String pointer to entity ID                       | BP.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
   NXFNC  |                             Function code                              |        
          |------------------------------------------------------------------------| 
   NXSEL  |                    Selection criteria for function                     |        
          |------------------------------------------------------------------------|   /\   
   NXDAT  |                  String pointer field to data string                   | BP.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
   NXERR  |                               Error code                               |        
          +------------------------------------------------------------------------+ 

           For field NXFLG(0-6):
                   NXWRM      0    Writing monitor's data base. 1=writing
                   NXWUS      1    Writing user's data string. 1=writing
                   NXZMC      2    Zeroing or clearing monitor core
                   NXCXP      3    Counter=1 or parameter=0
                   NXNIL      4    Not in layer. (I didn't bit)
                   NXECV      5    Do entity conversion
                   NXMCX      6    Buffer is in monitor context

           Field NXNTY     (9-11)  Node type, if node

                   XP NX.EXN  1     Executor node
                   XP NX.REN  2     Remote node
                   XP NX.LPN  3     Loopback node



                                    269
                               MONITOR TABLES
                                 NX (Cont.)



           Field NXLTY     (12-14) Line type

                   XP NX.TST  0     Test bed driver (obsolete)
                   XP NX.DTE  1     DTE
                   XP NX.KDP  2     KDP
                   XP NX.DDP  3     DDP
                   XP NX.CIP  4     CI PORT
                   XP NX.NI   5     ETHERNET
                   XP NX.DMR  6     DMR
    
           Field NXENT     (15-17) Entity type








































                                    270
                               MONITOR TABLES


                                    OA

   Argument block used by DECnet  Session  Control  and  NSP.   The  OPEN
   call's argument block.

   Defined in:  D36PAR

                                            Format                                  

                                     OPEN Argument Block                            
          +------------------------------------------------------------------------+ 
   OASCB  |                          SCB ID for new port                           |        
          |------------------------------------------------------------------------| 
   OANOD  |                            Destination node                            |        
          |------------------------------------------------------------------------| 
   OAFLO  |                           Flow control type                            |        
          |------------------------------------------------------------------------| 
   OAGOL  |                           Data request goal                            |        
          |------------------------------------------------------------------------| 
   OASIZ  |                 Max bytes allowed in a message segment                 |        
          |------------------------------------------------------------------------| 
   OASCV  |                    Session control's entry address                     |        
          |------------------------------------------------------------------------| 
   OACIR  |                            Loopback circuit                            |        
          +------------------------------------------------------------------------+ 




























                                    271
                               MONITOR TABLES


                                  OFNLEN

   Open File Length Table.  This resident table contains the current file
   byte  size  and file byte count for each open file.  It is parallel to
   the OFN areas of the SPT and SPTH tables.

   Defined in:  STG

   Index:  OFN number

                                   Format

            0        5 6                                         35
           +-------------------------------------------------------+
           | OFNBSZ   | OFNBC                                      | / \
   OFNLEN: | Byte Size|           File Byte Count                  |  |
           |-------------------------------------------------------|  |
           |                                                       | NOFN
           |                                                       |  |
           |                                                       |  |
           \                                                       \ \ /
           +-------------------------------------------------------+































                                    272
                               MONITOR TABLES


                                    PA

   The PA structure is used to keep the information for a DECnet  network
   management parameter.  It is pointed to by a table, generated with the
   PARAMETER macro.  This structure is read  by  the  routine  NTPARM  in
   D36COM.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   PAPNR  |                          Parameter Number                              |
          |------------------------------------------------------------------------| 
          | | | | | |                         |               PADEF                |
          |  PAFLA  |                         |    Default value for parameter     |
          |------------------------------------------------------------------------| 
          |               PAMAX               |               PAMIN                |
          |   Maximum value that can be set   |     Minimum value that be set      |
          |------------------------------------------------------------------------| 
   PASET  |              Instruction to execute to set the parameter               | 
          |------------------------------------------------------------------------| 
   PARED  |              Instruction to execute to read the parameter              | 
          |------------------------------------------------------------------------| 
   PACLR  |             Instruction to execute to clear the parameter              | 
          +------------------------------------------------------------------------+ 

           For field PAFLA(0-4):
                   PANST      0    Cannot set this parameter
                   PANCL      1    Cannot clear this parameter
                   PANRD      2    Cannot read this parameter (Write only memory)
                   PABEX      3    Buffer from NTMAN expected
                   PADRC      4    Don't range check "set" value




















                                    273
                               MONITOR TABLES


                                 PB-PHYKNI

   This is the NI Port Block data structure.  The port block is  used  by
   both  the  monitor  and the NI microcode to transfer and store control
   and status information.

   Defined in:  PHYKNI

                                            Format                                  

          +------------------------------------------------------------------------+ 
   PBCQI  |                        Command queue interlock                         | 
          |------------------------------------------------------------------------| 
   PBCQF  |                          Command queue flink                           | 
          |------------------------------------------------------------------------| 
   PBCQB  |                          Command queue blink                           | 
          |------------------------------------------------------------------------| 
   PBRS0  |                         Reserved for software                          | 
          |------------------------------------------------------------------------| 
   PBRQI  |                        Response queue interlock                        | 
          |------------------------------------------------------------------------| 
   PBRQF  |                          Response queue flink                          | 
          |------------------------------------------------------------------------| 
   PBRQB  |                          Response queue blink                          | 
          |------------------------------------------------------------------------| 
   PBRS1  |                                Reserved                                | 
          |------------------------------------------------------------------------| 
   PBUQI  |                 Unknown protocol type queue interlock                  | 
          |------------------------------------------------------------------------| 
   PBUQF  |                   Unknown protocol type queue flink                    | 
          |------------------------------------------------------------------------| 
   PBUQB  |                   Unknown protocol type queue blink                    | 
          |------------------------------------------------------------------------| 
   PBUQL  |                   Unknown protocol type queue length                   | 
          |------------------------------------------------------------------------| 
   PBRS2  |                                Reserved                                | 
          |------------------------------------------------------------------------| 
   PBPTT  |                  Protocol type table starting address                  | 
          |------------------------------------------------------------------------| 
   PBMTT  |                Multicast address table starting address                | 
          |------------------------------------------------------------------------| 
   PBRS3  |                                Reserved                                | 
          |------------------------------------------------------------------------| 
   PBER0  |                          KLNI error logout 0                           | 
          |------------------------------------------------------------------------| 
   PBER1  |                          KLNI error logout 1                           | 
          |------------------------------------------------------------------------| 
   PBLAD  |                    Address of channel logout word 1                    | 
          |------------------------------------------------------------------------| 
   PBCLO  |                   Contents of channel logout word 1                    | 



                                    274
                               MONITOR TABLES
                             PB-PHYKNI (Cont.)


          |------------------------------------------------------------------------| 
   PBPBA  |                    Port control block base address                     | 
          |------------------------------------------------------------------------| 
   PBPIA  |                          PI level assignment                           | 
          |------------------------------------------------------------------------| 
   PBIVA  |                      Interrupt vector assignment                       | 
          |------------------------------------------------------------------------| 
   PBCCW  |                          Channel command word                          | 
          |------------------------------------------------------------------------| 
   PBRCB  |                    Pointer to read counters buffer                     | 
          +------------------------------------------------------------------------+ 









































                                    275
                               MONITOR TABLES


                                 PB-SCPAR

   DECnet-36 Process Descriptor Block.  A "process block" is used to name
   local  and  remote processes.  There are two of these contained in the
   Connect Block, one for the destination name and  one  for  the  source
   name.

   Defined in:  SCPAR

                                            Format                                  

                                   Process Descriptor Block                         
          +------------------------------------------------------------------------+ 
          |               PBSIZ               |      PBFOR      |      PBOBJ       |
          |         The length field          |     Format      |   Object type    |
          |------------------------------------------------------------------------| 
          |               PBNCT               |                                    |
          |          Name byte count          |                                    |
          |------------------------------------------------------------------------|      /\      
   PBNAM  |                             End user name                              | <<^D16+3>/4> 
          \                                                                        \      \/      
          |------------------------------------------------------------------------| 
          |               PBGRP               |               PBUSR                |
          |              GRPCODE              | USRCODE (GRPCODE + USRCODE = PPN)  |
          +------------------------------------------------------------------------+ 




























                                    276
                               MONITOR TABLES


                                    PC

   PC is the read port counters block.  There are two words in the  table
   for  each  entry.  PC is used by NTCTRS for the SHOW COUNTERS and SHOW
   and ZERO COUNTERS network management functions.

   Defined in:  NIPAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          |                                                                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   PCSLZ  |                        Seconds since last zeroed                       |   
          |------------------------------------------------------------------------| 
          |                                                                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   PCBYR  |                             Bytes received                             |   
          |------------------------------------------------------------------------| 
          |                                                                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   PCDGR  |                           Datagrams received                           |   
          |------------------------------------------------------------------------| 
          |                                                                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   PCBYS  |                               Bytes sent                               |   
          |------------------------------------------------------------------------| 
          |                                                                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   PCDGS  |                             Datagrams sent                             |   
          |------------------------------------------------------------------------| 
          |                                                                        |
          |                                                                        |
          |------------------------------------------------------------------------| 
   PCUBU  |                         User buffer unavailable                        |   
          +------------------------------------------------------------------------+ 












                                    277
                               MONITOR TABLES


                         PCB (PORT CONTROL BLOCK)

   The mechanism where the KL10 and the CI20 share the  queue  structures
   is  controlled by the Port Control Block.  The Port Control Block is a
   data structure that exists in the physical memory space of  the  KL10.
   Both  the  KL10  and the CI20 read and write the data in the PCB.  The
   PCB  contains  the  link  words  for  the  queues  and  other  control
   information.
|  
|  Defined in:  SCAPAR


           +------------------------------------------------------+
   .PBBDT  |       Buffer Descriptor Table Starting Address       |
           +------------------------------------------------------+
   .PBMQE  |           Message Free Queue Entry Length            |
           +------------------------------------------------------+
   .PBDQE  |           Datagram Free Queue Entry Length           |
           +------------------------------------------------------+
           |                      Reserved                        |
           +------------------------------------------------------+
   .PBQ3I  |              Command Queue 3 Interlock               |
           +------------------------------------------------------+
   .PBQ3F  |                Command Queue 3 FLINK                 |
           +------------------------------------------------------+
   .PBQ3B  |                Command Queue 3 BLINK                 |
           +------------------------------------------------------+
   .PBQ2I  |              Command Queue 2 Interlock               |
           +------------------------------------------------------+
   .PBQ2F  |                Command Queue 2 FLINK                 |
           +------------------------------------------------------+
   .PBQ2B  |                Command Queue 2 BLINK                 |
           +------------------------------------------------------+
   .PBQ1I  |              Command Queue 1 Interlock               |
           +------------------------------------------------------+
   .PBQ1F  |                Command Queue 1 FLINK                 |
           +------------------------------------------------------+
   .PBQ1B  |                Command Queue 1 BLINK                 |
           +------------------------------------------------------+
   .PBQ0I  |              Command Queue 0 Interlock               |
           +------------------------------------------------------+
   .PBQ0F  |                Command Queue 0 FLINK                 |
           +------------------------------------------------------+
   .PBQ0B  |                Command Queue 0 BLINK                 |
           +------------------------------------------------------+
   .PBRQI  |               Response Queue Interlock               |
           +------------------------------------------------------+
   .PBRQF  |                 Response Queue FLINK                 |
           +------------------------------------------------------+
   .PBRQB  |                 Response Queue BLINK                 |



                                    278
                               MONITOR TABLES
                      PCB (PORT CONTROL BLOCK) (Cont.)


           +------------------------------------------------------+
   .PBMFI  |             Message Free Queue Interlock             |
           +------------------------------------------------------+
   .PBMFF  |               Message Free Queue FLINK               |
           +------------------------------------------------------+
   .PBMFB  |               Message Free Queue BLINK               |
           +------------------------------------------------------+
   .PBDFI  |            Datagram Free Queue Interlock             |
           +------------------------------------------------------+
   .PBDFF  |              Datagram Free Queue FLINK               |
           +------------------------------------------------------+
   .PBDFB  |              Datagram Free Queue BLINK               |
           +------------------------------------------------------+
           |                       Reserved                       |
           +------------------------------------------------------+
           |                       Reserved                       |
           +------------------------------------------------------+
           |                       Reserved                       |
           +------------------------------------------------------+
           |                       Reserved                       |
           +------------------------------------------------------+
   .PBER0  |                  Port Error Word 0                   |
           +------------------------------------------------------+
   .PBER1  |                  Port Error Word 1                   |
           +------------------------------------------------------+
   .PBER2  |                  Port Error Word 2                   |
           +------------------------------------------------------+
   .PBER3  |                  Port Error Word 3                   |
           +------------------------------------------------------+
   .PBER4  |                  Port Error Word 4                   |
           +------------------------------------------------------+
   .PBPBA  |                  PCB Base Address                    |
           +------------------------------------------------------+
   .PBPIA  |                      PI Level                        |
           +------------------------------------------------------+
           |                  Reserved to Port                    |
           +------------------------------------------------------+
   .PBCCW  |                Channel Command Word                  |
           +------------------------------------------------------+
           |                  Reserved to Port                    |
           +------------------------------------------------------+











                                    279
                               MONITOR TABLES


                                  PHYCHT

   PHYSIO Channel Dispatch Tables.  This  table  contains  the  names  of
   function dispatch tables for all supported channel types.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+   / \
   PHYCHT: |          .CTRH2           |          RH2DSP           |    |
           |-------------------------------------------------------|    |
           |          .CTCI            |          KLPDSP           |    |  
           |-------------------------------------------------------|  -PHYCHL
           |          .CTNI            |          KNIDSP           |    |
           |-------------------------------------------------------|    |
           |                           .                           |    |
           |                           .                           |    |
           |                           .                           |    |
           \                           .                           \    |
           +-------------------------------------------------------+   \ /
































                                    280
                               MONITOR TABLES


                                  PHYUNT

   PHYSIO Unit Dispatch Tables.  Table of known unit dispatch routines.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   PHYUNT: | Type (DSK)=.UTRP4        | DSK Unit Dispatch Adr.     |    / \
           |                          |         = RP4DSP           |     |
           |-------------------------------------------------------|     |
           |  Type (MTA)=.UTTM2       | MTA Unit Dispatch Adr.     |     |
           |                          |         = TM2DSP           |     |
           |-------------------------------------------------------|     |
           | Type (DX20A)=.UTDXA      | DX20 Dispatch Adr.         |   -PHYUNL
           |                          |         = DXADSP           |     |
           |-------------------------------------------------------|     |
           | Type (DX20B)=.UTDXB      | DX20 Dispatch Adr.         |     |
           |                          |         = DXBDSP           |     |
           |-------------------------------------------------------|     |
           | Type (TU78) =.UTTM7      | TU78 Dispatch Adr.         |     |
           |                          |         = TM8DSP           |    \ /
           +-------------------------------------------------------+





























                                    281
                               MONITOR TABLES


                                    PI

   This is the format of the NI% JSYS global portal ID.

   Defined in:  NIUSR

                                            Format                                  

                                Structure for global portal IDs                     
          +------------------------------------------------------------------------+ 
          |                                   |      PIFRK      |      PIPID       |
          |                                   |  Job wide fork  | Job wide portal  |
          |                                   |     number      |       ID         |
          +------------------------------------------------------------------------+ 







































                                    282
                               MONITOR TABLES


                                  PIDCNT

   Process ID Count Table.  This non-resident table holds the send  quota
   and count and the PID quota and count for each job.

   Defined in:  STG

   Index:  Job number

                                   Format

            0           8 9          17 18         26 27         35
           +-------------------------------------------------------+
   PIDCNT: | PIDSQ       | PIDSC       | PIDPQ       | PIDPC       |  / \
           |  Send quota |  Send count |  PID quota  |  PID count  |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           | NJOBS
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+






























                                    283
                               MONITOR TABLES


                                  PIDTBL

   Process ID Table.  This non-resident table  is  a  table  of  halfword
   entries,  one entry per PID; the number of entries in the table is two
   times the number of jobs.  (The monitor is assuming an  average  of  2
   PIDs  per  job.)  If  a  PID  is  in use, the table entry contains the
   address of the PID header.  PID's not  in  use  are  linked  together;
   PIDLST is the free PID header.

   Defined in:  STG

           +-------------------------------------------------------+
   PIDTBL: |  ADR of PID Header 1 or   |  ADR of PID Header 2 or   |  / \
           |   Link to Next Free PID   |   Link to Next Free PID   |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | PIDTBS
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+



























                                    284
                               MONITOR TABLES


                                    PL

   This is the NI portal list structure.  This structure contains a table
   of pointers to all Ethernet portal blocks defined by NI% jsys users.

   Defined in:  NIUSR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          |               PLMAX               |               PLNUM                |
          |   Highest portal defined so far   |Total number of portals defined so  |
          |                                   |                far                 |
          |------------------------------------------------------------------------|   /\   
   PLLIS  |                         The actual portal list                         | MAXPOR 
          \                                                                        \   \/   
          +------------------------------------------------------------------------+ 




































                                    285
                               MONITOR TABLES


                                 PR-NISRV

   This is the NI Portal Table block.

   Defined in:  NISRV

                                            Format                                  

          +------------------------------------------------------------------------+ 
   PRNXT  |                  Pointer to next block (must be first)                 | 
          |------------------------------------------------------------------------| 
          | | |             |      PREXI      |               PRBSZ                |
          |      PRFLG      | External portal |        Receive buffer size         |
          |                 |       ID        |                                    |
          |------------------------------------------------------------------------| 
   PRUID  |                       What user wants on callback                      | 
          |------------------------------------------------------------------------| 
          |               PRPMD               |               PRPRO                |
          |           Packing mode            |   Protocol type (bytes swapped)    |
          |------------------------------------------------------------------------| 
   PRCHN  |                     Ethernet channel block address                     | 
          |------------------------------------------------------------------------| 
   PRMUL  |                    Bit vector of enabled multicasts                    | 
          |------------------------------------------------------------------------| 
   PRPOS  |                            Callback address                            | 
          |------------------------------------------------------------------------| 
   PRCHK  |                   Check word (address of this block)                   | 
          |------------------------------------------------------------------------| 
   PRFQA  |                        Free queue header address                       | 
          |------------------------------------------------------------------------| 
   PROXM  |                          Outstanding transmits                         | 
          |------------------------------------------------------------------------| 
   PRORC  |                          Outstanding receives                          | 
          |------------------------------------------------------------------------| 
   PRTLZ  |                   Time at which counters were zeroed                   | 
          |------------------------------------------------------------------------| 
   PRBYR  |                             Bytes received                             | 
          |------------------------------------------------------------------------| 
   PRDGR  |                           Datagrams received                           | 
          |------------------------------------------------------------------------| 
   PRBYS  |                               Bytes sent                               | 
          |------------------------------------------------------------------------| 
   PRDGS  |                             Datagrams sent                             | 
          |------------------------------------------------------------------------| 
   PRUBU  |                         User buffer unavailable                        | 
          +------------------------------------------------------------------------+ 

           For field PRFLG(0-8):
                   PRCLO      0    Portal is closing
                   PRPAD      1    Pad flag



                                    286
                               MONITOR TABLES


                                 PR-NIUSR

   This is the NI Portal block.  One  exists  for  each  Ethernet  portal
   defined by the NI% JSYS.

   Defined in:  NIUSR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   PRNXT  |                         Pointer to next portal                         |        
          |------------------------------------------------------------------------| 
          |   PRUPD   | | | | |   |   PRLFK   |               PRFRK                |
          |  User's   |   PRFLG   | Job wide  |    Fork number of owning fork      |
          | portal ID |           |  fork #   |                                    |
          |------------------------------------------------------------------------| 
   PRCHK  |                               Check word                               |        
          |------------------------------------------------------------------------| 
          |         PRTCH         |         PRRCH         |         PRSCH          |
          |  Transmit completion  |  Receive completion   |     Status change      |
          |   interrupt channel   |   interrupt channel   |   interrupt channel    |
          |------------------------------------------------------------------------| 
   PRUNB  |                            UN block pointer                            |        
          |------------------------------------------------------------------------| 
   PRPID  |                           Monitor's portal ID                          |        
          |------------------------------------------------------------------------|   /\   
   PRXQH  |                        Transmitted queue header                        | XR.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   PRRQH  |                          Receive queue header                          | XR.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
   PRTRQ  |                             Transmit quota                             |        
          |------------------------------------------------------------------------| 
   PRRCQ  |                              Receive quota                             |        
          |------------------------------------------------------------------------| 
   PRTIP  |           Number of transmit buffers queued up to NISRV                |
          |------------------------------------------------------------------------| 
   PRRIP  |           Number of receive buffers queued up to NISRV                 |        
          +------------------------------------------------------------------------+ 

           For field PRFLG(6-11):
                   PRCCP      6    Close complete
                   PRRPS      7    Receive PSI requested
                   PRTPS      8    Transmit PSI requested
                   PRSPS      9    Status change PSI requested







                                    287
                               MONITOR TABLES


                                   PRMP

   This table contains pointers to the DNA  parameter  and  counter  data
   bases.   The  format  for  the  data  bases  is  described  in the DNA
   Parameter and Counter Data Base table.

   Defined in:  NTMAN

                                   Format

           +-------------------------------------------------------+
   PRMP:   |                     NODE pointer                      |
           +-------------------------------------------------------+
           |                     LINE pointer                      |
           +-------------------------------------------------------+
           |                     LOGGING pointer                   |
           +-------------------------------------------------------+
           |                     CIRCUIT pointer                   |
           +-------------------------------------------------------+
           |                     MODULE pointer                    |
           +-------------------------------------------------------+
           |                     EVENT pointer                     |
           +-------------------------------------------------------+

   Each pointer has the format:

           +-------------------------------------------------------+
           |             COUNT        |        ADDRESS             |
           +-------------------------------------------------------+

   The COUNT is the negative of the number  of  parameters  in  the  data
   base, and ADDRESS is the address of the first block in the data base.





















                                    288
                               MONITOR TABLES


                           PROCESS STORAGE AREA

   This area contains process specific information.   It  is  the  entire
   PSVAR  psect.   The PSBMAP in the PSB points to all of this area.  For
   this area, the monitor has indirect pointers in its page table  (MMAP)
   for  its pages beginning at PSSPSA:  (which is on a page boundary) for
   the length of the process storage area.  All of these pointers are  to
   a  single  location  in  the SPT (specifically SPT+NOFN+1).  With this
   arrangement, the process storage area for the current process  can  be
   changed  to  the  process  storage  area  for  another process by only
   changing the one location in the SPT.

   Defined in:  STG

                                   Format

   PSSPSA: +-------------------------------------------------------+
   CXBPGA: |                                                       | / \
           |            Start of process special pages             | 1
           |              Swapper, Map temporary page              | page
           \                                                       \ \ /
           |-------------------------------------------------------|
   CPTPGA: |                                                       | / \
           |              Swapper, Map temporary page              | 1
           \                                                       \ page
           |-------------------------------------------------------| \ /
   CPYPGA: |                                                       | / \
           |              Swapper, Map temporary page              | 1
           |             End of process special pages              | page
           \                                                       \ \ /
   PSSPEA: |-------------------------------------------------------|
   FPG0A:  |                                                       | / \
           |                   Fork utility page                   | 1
           \                                                       \ page
           |-------------------------------------------------------| \ /
   FPG1A:  |                                                       | / \
           |                   Fork utility page                   | 1
           \                                                       \ page
           |-------------------------------------------------------| \ /
   FPG2A:  |                                                       | / \
           |                   Fork utility page                   | 1
           \                                                       \ page
           |-------------------------------------------------------| \ /
   FPG3A:  |                                                       | / \
           |                   Fork utility page                   | 1
           \                                                       \ page
           |-------------------------------------------------------| \ /
   PSIPGA: |                                                       | / \
           |                PSI in progress storage                | NPSIPG (2)
           \                                                       \ pages



                                    289
                               MONITOR TABLES
                        PROCESS STORAGE AREA (Cont.)


           |-------------------------------------------------------| \ /
   IDXPGA: |                                                       | / \
           |              Index table is mapped here               | NIDXPG
           |               (zero length if sections)               | pages
           \                                                       \ \ /
           |-------------------------------------------------------|
   DIRPGA: |                                                       | / \
           |                   Directory window                    |DRMASZ
           |               (zero length if sections)               | pages
           \                                                       \ \ /
           |-------------------------------------------------------| / \
   DDTPXA: |                                                       |NDDTPG
           |                 MDDT private segment                  | pages
           \                                                       \ \ /
           |-------------------------------------------------------|
   UPTPGA: |                                                       | / \
           |               User section 0 page table               | 1
           |                 (see USER-PG-MAP-TBL)                 | page
           \                                                       \ \ /
           |-------------------------------------------------------|
   HWPTA:  |                  Hardware variables                   | / \
           |                       (see UPT)                       | 1
   PSBPGA: |                     overlaid with                     | page
           |                   First page of PSB                   |  |
           \                       (see PSB)                       \ \ /
           |-------------------------------------------------------| / \
   PS2PGA: |                                                       | 1
           |                  Second page of PSB                   | page
           \                                                       \ \ /
           +-------------------------------------------------------+






















                                    290
                               MONITOR TABLES


                                 PS-PHYKNI

   PS is the NI Port Storage block (channel block).  There is one channel
   block  for  each  NI  on the system.  The first block is pointed to by
   CHNBAS.  At this time, only one channel block is allocated, and it  is
   allocated at location PRTSTG (CHNBAS points to PRTSTG).

   Defined in:  PHYKNI

                                            Format                                  
          +------------------------------------------------------------------------+ 
   PSNXT  |                     Pointer to next channel block                      |   
          |------------------------------------------------------------------------| 
   PSPCB  |               Port control block base address (virtual)                |   
          |------------------------------------------------------------------------| 
   PSPBA  |                Port control block physical base address                |   
          |------------------------------------------------------------------------| 
   PSPTT  |                 Virtual address of protocol type table                 |   
          |------------------------------------------------------------------------| 
   PSMTT  |               Virtual address of multicast address table               |   
          |------------------------------------------------------------------------| 
   PSINT  |                     Interrupt level control buffer                     |   
          |------------------------------------------------------------------------| 
   PSNON  |                   Non-interrupt level control buffer                   |   
          |------------------------------------------------------------------------| 
   PSLPT  |                     Load PTT table buffer address                      |   
          |------------------------------------------------------------------------| 
   PSLMT  |              Load multicast address table buffer address               |   
          |------------------------------------------------------------------------| 
   PSWSI  |                   Write station info buffer address                    |   
          |------------------------------------------------------------------------| 
   PSRSI  |                    Read station info buffer address                    |   
          |------------------------------------------------------------------------|   /\   
   PSUNK  |               Pseudo PTT for unknown protocol type queue               | PT.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
          | | | | | | | | |                   |                                    |
          |               PSFLG               |                                    |
          |------------------------------------------------------------------------| 
   PSSTA  |                               Line state                               |        
          |------------------------------------------------------------------------| 
   PSHAD  |                   Stored high order station address                    |        
          |------------------------------------------------------------------------| 
   PSLAD  |                    Stored low order station address                    |        
          |------------------------------------------------------------------------| /\
   PSSAD  |                            Shadowed address                            | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   PSHRA  |                     Stored high order ROM address                      |   
          |------------------------------------------------------------------------| 
   PSLRA  |                      Stored low order ROM address                      |   


                                    291
                               MONITOR TABLES
                             PS-PHYKNI (Cont.)


          |------------------------------------------------------------------------| 
          | | | | | PSSVA | | | | |     PSRSP     | PSCHN |     |                  |
          | PSVAR |       | PSVBT |Maximum number |       |     |                  |
          |       |       |       | of entries on |       |     |                  |
          |       |       |       | the response  |       |     |                  |
          |       |       |       |      que      |       |     |                  |
          |------------------------------------------------------------------------| 
   PSCHK  |                    Check word, contains magic value                    |   
          |------------------------------------------------------------------------| 
   PSTLR  |                         Time of last response                          |   
          |------------------------------------------------------------------------| 
   PSCNO  |                             CONO KNI,(T1)                              |   
          |------------------------------------------------------------------------| 
   PSCNI  |                              CONI KNI,T1                               |   
          |------------------------------------------------------------------------| 
   PSDTO  |                              DATAO KNI,T1                              |   
          |------------------------------------------------------------------------| 
   PSDTI  |                              DATAI KNI,T1                              |   
          |------------------------------------------------------------------------| 
   PSCQA  |                     CONO KNI,CO.BTS+CO.CQA or NOP                      |   
          |------------------------------------------------------------------------| 
   PSMXT  |                    Number of multicasts transmitted                    |   
          |------------------------------------------------------------------------| 
          |               PSUMA               |               PSUMI                |
          |       Major version number        |       Minor version number         |
          |------------------------------------------------------------------------| 
   PSUED  |                              Edit number                               |   
          |------------------------------------------------------------------------| 
   PSTPC  |                           UDT of port crash                            |   
          |------------------------------------------------------------------------| 
   PSLAR  |                       LAR at time of uCode crash                       |   
          |------------------------------------------------------------------------| 
   PSCRL  |                  Left hand CRAM bits at time of crash                  |   
          |------------------------------------------------------------------------| 
   PSCRR  |                 Right hand CRAM bits at time of crash                  |   
          |------------------------------------------------------------------------| 
   PSTLZ  |                Time at which port counters were zeroed                 |   
          |------------------------------------------------------------------------| 
   PSSHC  |                    Address of shadow counters block                    |   
          +------------------------------------------------------------------------+ 

           For field PSFLG(0-17):
                   PSSLS      0    1=Line state needs reported
                   PSWUL      1    1=Waiting for uCode to be loaded
                   PSSTP      2    1=Waiting for port restart
                   PSBIG      3    1=KNISTP BUGINF reported
                   PSLSI      4    1=Need to write station information
                   PSLMC      5    1=Need to do load multicast table command
                   PSLPP      6    1=Need to do load protocol table command
                   PSVAD      7    1=PSHAD/LAD is valid


                                    292
                               MONITOR TABLES
                             PS-PHYKNI (Cont.)


           For field PSVAR(0-3):
                   PSCRC      0    Allow receipt of frames with CRC errors
                   PSPMC      1    Station is in Promiscuous multicast mode
                   PSH40      2    H4000 mode if 1
                   PSPRM      3    Promiscious mode if 1

           For field PSVBT(8-11):
                   PSVCR      8    PSCRC is valid
                   PSVPM      9    PSPMC is valid
                   PSVH4      10   PSH40 is valid
                   PSVPR      11   PSPRM is valid

           Field PSCBA     (24-26) CBUS address


           0  1                           17 18             26 27                35
          +------------------------------------------------------------------------+
   PSSTA  | |                               |  PSSST          |  PSEXS             |
          +------------------------------------------------------------------------+

        Symbol   Bits    Meaning

        PSRUN      1     Channel is running; should be 1b0
        PSSST    18-26   Channel substate
        PSEXS    27-35   Channel external state



























                                    293
                               MONITOR TABLES


                                 PS-SCPAR

   This is DECnet-36 PSI data passed  back  from  SCLINK  on  a  call  to
   SCTPSQ,  the  "Read  PSI Queue" routine.  The data is passed in T1 and
   T2.

   Defined in:  SCPAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | |                                 |               PSPSM                |
          |               PSFLG               |    The PSI mask for this link      | *
          |------------------------------------------------------------------------| 
          |               PSSTS               |               PSCHN                |
          |       The status half-word        |        The channel number          |
          +------------------------------------------------------------------------+ 

           For field PSFLG(0-17):
                   PSMOR      0    Set if more PSIs queued

































                                    294
                               MONITOR TABLES


                                    PSB

   Process Storage Block.  Each process has a PSB which holds information
   such  as:   the  PC  and  ACs  when  not  running; forks known to this
   process, and accounting, PSI, paging and  directory  information.   It
   also  holds  trapping  information and the hardware cells for the User
   Process Table (See UPT Table).  Page 2 of the PSB houses the push down
   list  used  by  the  monitor when executing JSYSs (that is, in process
   context).  The PSBMAP map in the PSB points to all of the  per-process
   storage area (including the PSB itself).  For further information, see
   also the Process Storage Area.

   Defined in:  STG


                                   Format
           +-------------------------------------------------------+ / \
   UACB:   |         AC block 1 saved here when JSYS starts        |  |
           |           (ACBAS points at last block saved)          | NUACB
           |                                                       |  |
           \                                                       \  |
           |-------------------------------------------------------| \ /
   JOBNO:  |              Job # to Which Fork Belongs              |
           |-------------------------------------------------------|
   JOBBIT: |                  SCHED Control Bits                   |
           |-------------------------------------------------------|
   FNPMAX: | Maximum Number of Pages in Working Set for This Fork  |
           |-------------------------------------------------------|
   JOBCK0: |        Variables for Scheduler Time Guarantee         |
           |-------------------------------------------------------|
   JOBCK1: |        Variables for Scheduler Time Guarantee         |
           |-------------------------------------------------------|
   RUNT2:  |      Run Time Fractional Parts of a Millisecond       |
           |-------------------------------------------------------| / \
   FKTAB:  |         Local Fork Handle to Job Handle Table         | NLFKS/2
           \                                                       \  |
           |-------------------------------------------------------| \ /
   FORKN:  |  Job Fork # at Top Fork   |         This Fork         |
           |-------------------------------------------------------|
   FKRT:   |                     Fork Run Time                     |
           |-------------------------------------------------------|
   PRARGP: |             Pointer to Process Arguments              |
           |-------------------------------------------------------|
   MPP:    |       Monitor Saved Stack Pointer at Last JSYS        |
           |-------------------------------------------------------|
   PRIMRY: |           Primary I/O Indirection Pointers            |
           |-------------------------------------------------------|
   SLOWF:  |                 Slow MON Routine Flag                 |
           |-------------------------------------------------------|
   INTDF:  |              Defer Interrupts IF .GE. 0               |



                                    295
                               MONITOR TABLES
                                PSB (Cont.)


           |-------------------------------------------------------|
   INTDFF: |               SOS INTDF or JSYS PSISV1                |
           |-------------------------------------------------------|
   MJRSTF: |               XJRSTF FFL or JSYS PSISV0               |
           |-------------------------------------------------------|
   ACBAS:  |               Current AC Stack Pointer                |
           |-------------------------------------------------------|
   ITFFL:  |              Flags on Interrupt to MEXEC              |
           |             (Must be contiguous with ITFPC)           |
           |-------------------------------------------------------|
   ITFPC:  |               PC on Interrupt to MEXEC                |
           |-------------------------------------------------------|
   TRPID:  |              IDENT of Page Causing Trap               |
           |-------------------------------------------------------|
   TRPPTR: |        Storage Address or Pointer Causing Trap        |
           |-------------------------------------------------------| / \
   UAC:    |              User ACs (from AC block 1)               | 20
           \         Saved here when process not running           \ \ /
           |-------------------------------------------------------| / \
   PAC:    |                      Process ACs                      |  |
           \   EXEC AC's are saved here when process not running   \ 20
           |-------------------------------------------------------| \ /
   PFL:    |   Process Flags (Must be contiguous with PPC)         |
           |-------------------------------------------------------|
   PPC:    |                      Process PC                       |
           |-------------------------------------------------------|
   NSKED:  |                   No-Schedule Word                    |
           |-------------------------------------------------------|
   RSKED:  |            No-Schedule Trap JFCL/JSR RSKCHK           |
           |-------------------------------------------------------| / \
           |                                                       |  |
   TRAPSK: |             Stack Used During Pager Traps             | NTSK=
           \                                                       \  133
           |-------------------------------------------------------| \ /
   TRAPAP: |                   Page Trap Saved P                   |
           |-------------------------------------------------------|
   TRAPC:  |              Pager Trap Recursion Count               |
           |-------------------------------------------------------|
   UTRSW:  |            Saved Page Fail Word for User              |
           |-------------------------------------------------------|
   UTRPCT: |         Count of Pager Traps for This Process         |
           |-------------------------------------------------------|
   USWPCT: |        Count of SWPINW Calls for This Process         |
           |-------------------------------------------------------|
   PTTIM:  |               Time Spent in Pager Traps               |
           |-------------------------------------------------------|
   LSTXGR: |                Time (FKRT) of Last XGC                |
           |-------------------------------------------------------|
   FKTLST: |            Lost Time While Clock Turned Off           |



                                    296
                               MONITOR TABLES
                                PSB (Cont.)


           |-------------------------------------------------------|
   CRSKED: |              In Critical Section if Non-0             |
           |-------------------------------------------------------|
   SKDFL:  |             Scheduler Temp (Return Flags)             |
           |-------------------------------------------------------|
   SKDPC:  |      Scheduler Temp (Return) Must Stay With SKDFL     |
           |-------------------------------------------------------|
   MONBK:  |            Interrupt to Monitor if non-zero           |
           |-------------------------------------------------------|
   LSTIPC: |                 PC of Last JSP T2, ITRAP1             |
           |-------------------------------------------------------|
   PSIPT:  |               PSI Storage List Pointer                |
           |-------------------------------------------------------|
   PIOLDS: |           FKSTAT Prior To PSI if was Waiting          |
           |-------------------------------------------------------|
   LEVCHN: |          Level Table      |  Channel Table Addresses  |
           |-------------------------------------------------------|
   PSISYS: |                Non-0 if PSI System Off                |
           |-------------------------------------------------------|
   MONCHN: |             Channels Reserved by Monitor              |
           |-------------------------------------------------------|
   PSICHA: |             Channel Assigned to TERM Code             | / \
           \                                                       \ NTERMI/6
           |-------------------------------------------------------| \ /
   PIMSK:  |     PSI Request Word Being Passed to PSI Service      |
           |-------------------------------------------------------|
   PSIBW:  |                  Break Waiting Word                   |
           |-------------------------------------------------------|
   FORCTC: |     Channel Which Caused Forced Fork Termination      |
           |-------------------------------------------------------|
   PSICHM: |                 Channel Enabled Word                  |
           |-------------------------------------------------------|
   SUPCHN: |             Channels Reserved by Superior             |
           |-------------------------------------------------------|
   ENSKR:  |                 Scheduler Temp (Return)               | / \
           \                       XPCW block                      \  4
           |-------------------------------------------------------| \ /
           |              Hardware Storage  (UPT cells)            |
    UPTTPI=|                                                       |
    HWPTA+ |                (see UPT Table Description)            |
      420  |                                                       |
           \                                                       \
           |-------------------------------------------------------|
   PIOLD2: |          FKSTA2 prior to PSI if was waiting           |
           |                                                       |
           |-------------------------------------------------------| 
   PSIBIP: |            Break in Progress Word (Levels)            |
           |-------------------------------------------------------|
   ADRBRK: |                 Address Break Information             |



                                    297
                               MONITOR TABLES
                                PSB (Cont.)


           |-------------------------------------------------------|
   ADRBK1: |      Address of Instruction Causing Address Break     |
           |-------------------------------------------------------|
   ADRBAD: |          Last Break Referenced this Address           |
           |-------------------------------------------------------|
   FRKNOP: |                NOP or MDDT breakpoint                 |
           |-------------------------------------------------------|
   PIFL:   |            Saved Flags (Must be with PIPC)            |
           |-------------------------------------------------------| / \
   PIPC:   |           Saved PC during Initial PI Service          |  3
           \                  (called with XPCW)                   \  |
           |-------------------------------------------------------| \ /
   FKTOFF: |           Time at Which CPU Clock Turned Off          |
           |-------------------------------------------------------|
   NWSCE:  |              Number of Entries in WS Cache            |
           |-------------------------------------------------------|
   LSTXGT: |                Time (TODCLK) of Last XGC              |
           |-------------------------------------------------------| / \
   UMUUOW: \                 Save MUUO Word for User               \  2
           |-------------------------------------------------------| \ /
   KIMUU1: \                 Last UUO Word from User               \ / \
           |-------------------------------------------------------|  2
   PSLEVT: |              Address of User's Level Table            | \ /
           |-------------------------------------------------------|
   PSCHNT: |             Address of User's Channel Table           |
           |-------------------------------------------------------|
   PSBITS: |             Miscellaneous Per Process Bits            |
           |-------------------------------------------------------|
   TRPDSP: |             Dispatch for MON ILLEG MEM REF            |
           |-------------------------------------------------------|
   HPSWRN: |    Time to flag excessive high priority scheduling    |
           |-------------------------------------------------------|
   DDPFRK: |               1 => this is DDMP fork                  |
           |-------------------------------------------------------|
   PSBSAB: |        Address of DECnet SAB indirect table           |
           |-------------------------------------------------------|
   SCSTMQ: |         Head pointer for SCS% message queue           |
           |-------------------------------------------------------|
   SCSBMQ: |         Tail pointer for SCS% message queue           |
           |-------------------------------------------------------|
   SCSTDQ: |         Head pointer for SCS% datagram queue          |
           |-------------------------------------------------------|
   SCSBDQ: |         Tail pointer for SCS% datagram queue          |
           |-------------------------------------------------------|
   SCSTXQ: |         Head pointer for SCS% DMA xfer queue          |
           |-------------------------------------------------------|
   SCSBXQ: |         Tail pointer for SCS% DMA xfer queue          |
           |-------------------------------------------------------|
   SCSTEQ: |         Head pointer for SCS% event queue             |



                                    298
                               MONITOR TABLES
                                PSB (Cont.)


           |-------------------------------------------------------|
   SCSBEQ: |         Tail pointer for SCS% event queue             |
           |-------------------------------------------------------|
   SCSPS0: |         PSI channels for msg avail,,dg available      |
           |-------------------------------------------------------|
   SCSPS1: |         PSI channels for DMA avail,,events            |
           |-------------------------------------------------------|
   SCSTCQ: |         Head pointer for CB queue                     |
           |-------------------------------------------------------|
   SCSBCQ: |         Tail pointer for CB queue                     |
           |-------------------------------------------------------|
   SCSTXN: |         Head pointer for list of DMA buffer names     |
           |-------------------------------------------------------|
   SCSBXN: |         Tail pointer for list of DMA buffer names     |
           |-------------------------------------------------------|
   EVLNTH: |                 Entry Vector Length                   |
           |-------------------------------------------------------|
   EVADDR: |                 Entry Vector Address                  |
           |-------------------------------------------------------|
   PATLEV: |             PA1050 Entry Vector Length                |
           |-------------------------------------------------------|
   PATADR: |        PA1050 Compatability Entry Vector Address      |
           |-------------------------------------------------------|
   PATU40: |      Where to Store C(40), Setup as UMOVEM 1,XX       |
           |-------------------------------------------------------|
   PATUPC: |       Where to Store PC, Setup as UMOVEM 1, XX        |
           |-------------------------------------------------------|
   DMSLEV: |                   RMS Entry Vector Length             |
           |-------------------------------------------------------|
   DMSADR: |                   RMS Entry Vector Address            |
           |-------------------------------------------------------|
   DMSU40: |           Where to Store C(40) on DMS Call            |
           |-------------------------------------------------------|
   DMSUPC: |             Where to Store PC of DMS Call             |
           |-------------------------------------------------------|
|  ENQWRD: |             Used for Cluster ENQ/DEQ                  |
|          |             (0=Not doing Cluster ENQ)                 |
|          |-------------------------------------------------------|
   CABMSK: |                  Capability Mask                      |
           |-------------------------------------------------------|
   CAPENB: |                Capabilities Enabled                   |
           |-------------------------------------------------------|
   SNPPGS: |          Count           | Page # of First Page Locked|
           |-------------------------------------------------------|
   SNPLST: |          Flags           | Link to 1st BP for Fork    |
           |-------------------------------------------------------|
   LSTERR: |                   Last Error Number                   |
           |-------------------------------------------------------|
   PDVS:   |                 Pointer to PDV block                  |



                                    299
                               MONITOR TABLES
                                PSB (Cont.)


           |-------------------------------------------------------| / \
   ERRSAV: \               Block of Error Parameters               \ NERRSV
           |-------------------------------------------------------| \ /
           |                                                       | / \
   PSBMAP: |                 Map for Process Area                  |  |
           |                                                       | PSBMSZ
           |                                                       |  |
           \                                                       \  |
           |-------------------------------------------------------| \ /
   JTBLK:  |               FKJTB + forkn for this fork             |
           |-------------------------------------------------------|
   JTLCK:  |        Lock on JSYS Trap to Monitor (this) fork       |
           |        Lock Protects JTTRW and Allows Only one        |
           |     JSYS Trap Interrupt at a Time to This Monitor     |
           |-------------------------------------------------------|
   JTTRW:  |        JSYS Trap Word (Set by interrupting fork)      |
           |             Contains trapping instruction             |
           |-------------------------------------------------------|
   JTTFK:  |                         |JTFRK                        |
           |                         |  Forkn of Trapping Fork     |
           |-------------------------------------------------------|
           |              |12      17|                             |
   JTMNW:  |              | JTMCN    | JTNMI                       |
           |              | Monitor's|  Forkn of Mon Interrupted   |
           |              | PSI Chan | (PSI'd)                     |
           |-------------------------------------------------------|
   PNSKDC: |   NOSKED's Done by DIAG & other Resource Managers     |
           |-------------------------------------------------------|
   ARTHTR: |            User-Specified Arithmetic Trap             |
           |-------------------------------------------------------|
   PDOVTR: |        Address of user's block for PDL overflow       |
           |-------------------------------------------------------|
   CRTRGN: |               Indicates Critical Region               |
           |-------------------------------------------------------|
   STRWRD: |  STRFLG                 | NOSTR                       |
           |     Flag for STR Info   |   # Mount Count Increments  |
           |                         |    (for KSELF)              |
           |-------------------------------------------------------|
   FKXORA: |        Fork IDXORA During Creation of Structure       |
           |-------------------------------------------------------|
   LOKH1:  |        Index of Highest Lock Held At This Time        |
           |-------------------------------------------------------|
   DRLOC:  |         Location in Directory During Searches         |
           |-------------------------------------------------------|
   DRINP:  |          Pointer to Input Name During Lookup          |
           |-------------------------------------------------------|
   DRINL:  |                Length of Input String                 |





                                    300
                               MONITOR TABLES
                                PSB (Cont.)


           |-------------------------------------------------------|
   DRMSK:  |         Mask of 0 Bits in Last Word of String         |
           |-------------------------------------------------------|
   DRSCN:  |           Pointer to FDB Link During Lookup           |
           |-------------------------------------------------------|
|  DRREC:  |             Count of Recognized Characters            |
|          |              (Partial File Recognition)               |
|          |-------------------------------------------------------|
           |0                    17|18     |19                   35|
   DROFN:  |DRLFDB                 |DRROF  |DIROFN                 |
           |  Last FDB Checked by  |Release|OFN of Current Mapped  |
           |   FDBCHK              | OFN   | Directory             |
           |-------------------------------------------------------|
   DRMAP:  |              Adr of Map Page when SEC2                |
           |-------------------------------------------------------|
   DIRCAD: |             Cache Address of Last MAPDIR              |
           |-------------------------------------------------------|
   IDXMAP: | Adr of IDX Tbl. Pg Map When Extended Addressing       |
           |-------------------------------------------------------|
           |0                    17|18     |19                   35|
   STRINF: |CURUC                  |IDXFLG |CURSTR                 |
           | Unique Code of        |XB File| Str. No. of Cur.      |
           | Currently Mapped Index| Mapped|  Mapped Index File    |
           | File                  |       |                       |
           |-------------------------------------------------------|
|  UPLIST: |       Pointer to Portal List for NI% JSYS             |
|          |-------------------------------------------------------|
           \ / / / / / / / / / / / / / / / / / / / / / / / / / / / \
           |-------------------------------------------------------|  / \
   WSCSH:  |           (Begins at Top of Second PSB Page)          |   |
           |                 Working Set Cache                     |  WSCHCW
           \                                                       \   |
           |-------------------------------------------------------|  \ /
   PIPDB:  |                   PSI Routines stack                  |  / \
           |                                                       |   |
           |                                                       | NPIPDL
           |                                                       |   |
           |                                                       |  \ /
           |-------------------------------------------------------|  / \
           |                                                       |   |
   PIAC:   |                 Saved user ACs during                 |   20
           |                      break start                      |   |
           |-------------------------------------------------------|  \ /
           \ / / / / / / / / / / / / / / / / / / / / / / / / / / / \
           |-------------------------------------------------------|  / \
   UPDL:   |               User PDL for Monitor Calls              |   |
           |      UPDL is Defined as the End of this Page NUPDL    |  NUPDL
           \                                                       \   |
           +-------------------------------------------------------+  \ /



                                    301
                               MONITOR TABLES


                                 PT-IPCIDV

   The PT structure contains information about each TCP port.

   Defined in:  IPCIDV

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | | | |                             |               PTSTA                |
          | | | |                             |            Port state              |
          | | | |                             | (DOWN,CONNECT,LISTEN,ACCEPT,RUN)   | *
          +------------------------------------------------------------------------+ 

           Field PTOWN     (0-0)   Set if this is local port

           Field PTHOS     (1-1)   Set if this port is hostile,
                                   that is, not TOPS-20



































                                    302
                               MONITOR TABLES


                                 PT-PHYKNI

   This is the NI Protocol type table.  There is  a  PT  block  for  each
   protocol  enabled  for the NI port -- up to NPTT (16) blocks.  A table
   of PT blocks is allocated by the monitor at location PTTADR.   Channel
   block  word  PSPTT points to the first PT block; that is, it points to
   PTTADR.

   Defined in:  PHYKNI

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | |                             |             PTTYP             | |      |
          | |                             |         Protocol type         | |      | *
          |------------------------------------------------------------------------| 
   PTFRQ  |                        Free queue header address                       | 
          |------------------------------------------------------------------------| 
   PTVIR  |                  Virtual address of free queue header                  | 
          +------------------------------------------------------------------------+ 

           Field PTENA     (0-0)   Protocol is enabled

           Field PTFRE     (32-32) 1 means entry is free





























                                    303
                               MONITOR TABLES


                                 PT-SCPAR

   This is the DECnet-36 Port Table.  The port table contains information
   describing the state of a user's DECnet connection.

   Defined in:  SCPAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          |   PTCON   |   PTINT   |   PTDAT   | | | | | | | |                      |
          |User's PSI |User's PSI |User's PSI | | | | | | | |                      |
          |  channel  |  channel  |  channel  | | | | | | | |                      |
          |    for    |    for    | for Data/ | | | | | | | |                      | *
          | incoming  | interrupt |Disconnect | | | | | | | |                      | 
          | CI or CC  | messages  |           | | | | | | | |                      |
          |------------------------------------------------------------------------| 
          |               PTJFN               |               PTFRK                |
          |    JFN associated with channel    |            Fork number             |
          |------------------------------------------------------------------------| 
          |               PTSTS               |                                    |
          |            Link status            |                                    |
          |------------------------------------------------------------------------| 
   PTDEV  |                     Storage for DEV during a block                     |                
          +------------------------------------------------------------------------+ 

           Field PTTYP     (18-18) Open type:  0=Passive  1=Active

           Field PTEMI     (19-19) EOM has arrived

           Field PTPSI     (20-20) User has been "PSI"ed for data available

           Field PTLWC     (21-21) Link was connected indicator

           Field PTBLK     (22-22) This link is blocked (blocking I/O)
    
           Field PTWAK     (23-23) Wake the next process that tries to block

           Field PTNRR     (24-24) Null record received














                                    304
                               MONITOR TABLES


                                  PTYSTS

   Pseudo Terminal Status Table.  This table contains  the  PTY's  status
   word.

   Defined in:  STG

   Index:  PTY Number

                                   Format

           +-------------------------------------------------------+  / \
   PTYSTS: |                    PTY Status Bits                    |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           | NTTPTY
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+






























                                    305
                               MONITOR TABLES


                                    QA

   This structure contains the data request count (in T2), an inter-layer
   parameter passed by Session Control to NSP.

   Defined in:  D36PAR
          


                                            Format                                  
|          0         5
|         +------------------------------------------------------------------------+ 
|         |   QAFLG   |                       |               QACNT                |
|         |           |                       |   THE DATA REQUEST COUNT BEING     |
|         |           |                       |             REQUESTED              |
|         +------------------------------------------------------------------------+ 
                       
|          QAOFF -- Set if the sublink is to be turned off



































                                    306
                               MONITOR TABLES


                                    QB

   This is the DECnet queue block.

   Defined in:  DNADLL

                                            Format                                  

          +------------------------------------------------------------------------+ 
   QBNXT  |                    Pointer to next request in queue                    | 
          |------------------------------------------------------------------------| 
          |               QBFCN               |                                    |
          |        Function requested         |                                    |
          |------------------------------------------------------------------------| 
   QBDA1  |                         Function specific data                         | 
          |------------------------------------------------------------------------| 
   QBDA2  |                             Additional data                            | 
          |------------------------------------------------------------------------| 
   QBDLB  |                   Associated data link block address                   | 
          +------------------------------------------------------------------------+ 

































                                    307
                               MONITOR TABLES


                                  Q-BLOCK

|  The information for each ENQ request is stored in a Q-BLOCK.  Q-BLOCKs
|  are  doubly  linked  for each job; the list header is in ENQLST in the
|  JSB.  Also, Q-BLOCKs are doubly linked on a system wide list for  each
|  lock block; the list header is in the lock block.
|  
|  Defined in:  ENQPAR

                                   Format

            0                        17 18                       35
           +-------------------------------------------------------+
         0 | ENQLJQ                                                |
           |        Back Pointer to Last Q-BLOCK for job           |
           |-------------------------------------------------------|
         1 | ENQNJQ                                                |
           |        Forward Pointer to Next Q-BLOCK for job        |
           |-------------------------------------------------------|
         2 | ENQLLQ                                                |
           |              Back Pointer to Last Q-BLOCK             |
           |-------------------------------------------------------|
         3 | ENQNLQ                                                |
           |            Forward Pointer to Next Q-BLOCK            |
           |-------------------------------------------------------|
         4 | ENQFLG         |ENQCHN:  |ENQFRK:                     |
           |       Flags    |   PSI   |     Fork to Interrupt      | *
           |                | Channel |  When Request Is Locked    |
           |-------------------------------------------------------|
         5 | ENQNR                    |ENQID:                      |
           |  Number of Resources     |     Request ID Code        |
           |    Requested from Pool   |                            |
           |-------------------------------------------------------|
         6 | ENQLRQ                                                |
           |        Back Pointer to Last Q-BLOCK of Request        |
           |-------------------------------------------------------|
         7 | ENQFQ                                                 |
           |        Forward Pointer to Next Q-BLOCK of Request     |
           |-------------------------------------------------------|
        10 | ENQLBP                                                |
           |                Pointer to LOCK-BLOCK                  |
           |-------------------------------------------------------|
        11 |                          |ENQGRP                      |
           |                          |    Group Number of         |
           |        Reserved          |    Sharable Request        |
           |-------------------------------------------------------|
        12 | ENQNST                   |ENQJFN:                     |
           |     Nest Count           |     JFN of Request         |
           |                          |     or -1, -2, or -3       |
           |-------------------------------------------------------|
        13 | ENQMSK                                                |
           |                Pointer to MASK BLOCK                  |
           +-------------------------------------------------------+
                                    308
                               MONITOR TABLES
                              Q-BLOCK (Cont.)


   The flags word must occur in the same position in both the  Lock-Block
   and  the  Q-Block.  The flags word is used to distinguish a Lock-block
   from a Q-block.


            0              11 12        17 18                    35
   Word 4  +-------------------------------------------------------+
           | ENQFLG Flags    |   ENQCHN   |        ENQFRK          |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Contents

|     EN.SDO=400    3                  Scheduling pass needed on
|                                      Lock-Block
|     EN.CLL=200    4                  Cluster-wide queue block or
|                                      Cluster-wide lock-block
|     EN.NOV=100    5                  No vote for this lock-block
|                                      Set during caching and for -1
|                                      type locks
      EN.LTL=40     6                  Long Term Lock
      EN.INV=20     7                  This Q-Block is invisible
      EN.LOK=10     8                  The Q-Block has the Lock
                                        Locked.
      EN.TXT=4      9                  This Block has a Text
                                        String Identifier.
      EN.EXC=2     10                  Request is Exclusive
      EN.LB=1      11                  This is the Lock-Block
                  12-17                Reserved
                  18-35    ENQLVL      Level number of this lock.






















                                    309
                               MONITOR TABLES


                                    QE

   QE describes the format of the header for all command,  response,  and
   unknown protocal queue entries.  The NI uCode expects this format.

   Defined in:  PHYKNI

                                            Format                                  

                                         Queue entry                                
          +------------------------------------------------------------------------+ 
   QEFLI  |                              Forward link                              |   
          |------------------------------------------------------------------------| 
   QEBLI  |                             Backward link                              |   
          |------------------------------------------------------------------------| 
   QEVIR  |                        Virtual address of entry                        |   
          |------------------------------------------------------------------------| 
   QEOPC  |                       Queue entry operation code                       |   
          +------------------------------------------------------------------------+ 


































                                    310
                               MONITOR TABLES


                                 QH-D36PAR

   Structure QH, queue header, is used by the ENDQUE,  DEQUE  and  RMVQUE
   macros for manipulation of DECnet queues.

   Defined in:  D36PAR

                                            Format                                  

                                         Queue Header                               
          +------------------------------------------------------------------------+ 
   QHBEG  |                    Pointer to first entry in queue                     | 
          |------------------------------------------------------------------------| 
   QHEND  |                     Pointer to last entry in queue                     | 
          |------------------------------------------------------------------------| 
          |               QHMAX               |               QHCNT                |
          |     Max length queue ever got     |      Current length of queue       |
          +------------------------------------------------------------------------+ 



































                                    311
                               MONITOR TABLES


                                 QH-PHYKNI

   QH defines the queue header format  for  the  command,  response,  and
   unknown  protocol  queues.   The  NI uCode expects the queue header to
   have this format.

   Defined in:  PHYKNI

                                            Format                                  

                                   Queue header definition                          
          +------------------------------------------------------------------------+ 
   QHIWD  |                             Interlock word                             |   
          |------------------------------------------------------------------------| 
   QHFLI  |                              Forward link                              |   
          |------------------------------------------------------------------------| 
   QHBLI  |                             Backward link                              |   
          |------------------------------------------------------------------------| 
   QHLEN  |                        Length of queue entries                         |   
          +------------------------------------------------------------------------+ 

































                                    312
                               MONITOR TABLES


                                    QL

   QL is the Queue Link definition used by LAT.  All  LAT  queue  entries
   are linked together using this structure.

   Defined in:  LATSRV

                                            Format                                  

                                   Halfword Queue Link Word                         
          +------------------------------------------------------------------------+ 
   QLFWD  |                       Next forward queue element                       |                
          |------------------------------------------------------------------------| 
   QLBWD  |                    Previous backward queue element                     |                
          +------------------------------------------------------------------------+ 






































                                    313
                               MONITOR TABLES


                                    QP

   Structure QP, queue pointer, is included to emphasize  the  fact  that
   the  ENDQUE and DEQUE macros used by DECnet expect the forward pointer
   in a block to be  a  full  word - and  to  simplify  the  addition  of
   backward pointers should that become desirable.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   QPNXT  |                     Pointer to next block on queue                     | 
          +------------------------------------------------------------------------+ 







































                                    314
                               MONITOR TABLES


                                    RB

   This is the DECnet low level MOP request block.

   Defined in:  LLMOP

                                            Format                                  

                                 Common header portion of RB                        
          +------------------------------------------------------------------------+ 
   RBFWD  |                     List chain pointer to next RB                      | 
          |------------------------------------------------------------------------| 
   RBSTT  |                             Request State                              | 
          |------------------------------------------------------------------------| 
          | | | | | | |                       | |                   |   RBICH   |  |
          |               RBFLG               | |                   | Interrupt |  |
          |                                   | |                   |  Channel  |  | *
          |                                   | |                   | Number (0 |  |
          |                                   | |                   |  to 35)   |  |
          |------------------------------------------------------------------------| 
   RBRNO  |                             Receipt Number                             | 
          |------------------------------------------------------------------------| 
   RBCID  |                               Channel Id                               | 
          |------------------------------------------------------------------------| /\
   RBDST  |                          Destination Address                           | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   RBMSO  |                         MSD Address for Output                         |   
          |------------------------------------------------------------------------| 
   RBMSI  |                         MSD Address for Input                          |   
          |------------------------------------------------------------------------| 
   RBFRK  |                              Fork Number                               |   
          |------------------------------------------------------------------------| 
   RBJOB  |                               Job Number                               |   
          +------------------------------------------------------------------------+ 

           For field RBFLG(0-17):
                   RBFTI      0    Transmit Request Initiated
                   RBFTC      1    Transmit Request Complete
                   RBFTF      2    Transmit Request Failed
                   RBFRC      3    Receive Response Complete
                   RBFRF      4    Receive Response Failed
                   RBABT      5    Abort this request

|          Field RBAIC     (18-18)     Assign Interrupt Channel
              
|          Field RBICH     (29-34)     Interrupt Channel






                                    315
                               MONITOR TABLES


                                 RC-D36PAR

   This is the DECnet  router  circuit  block,  which  contains  all  the
   "per-circuit" data for Router-36.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   RCNXT  |                     Pointer to next circuit block                      |        
          |------------------------------------------------------------------------| 
   RCLID  |                               Circuit ID                               |        
          |------------------------------------------------------------------------| 
   RCDLB  |                        Data link block address                         |        
          |------------------------------------------------------------------------|   /\   
   RCAJQ  |             Queue of adjacencies belonging to this circuit             | QH.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
|         | | | | | | |     |         RCCST         |      RCDRT      |            |
|         |   RCFLG   |RCSTA|     Circuit cost      | Timer before we |            | *
          |           |     |                       | assume DSR role |            | 
          |------------------------------------------------------------------------| 
   RCTLS  |                 Time last message of any type was sent                 |        
          |------------------------------------------------------------------------| 
   RCTLR  |                   Time last routing message was sent                   |        
          |------------------------------------------------------------------------| 
   RCTLH  |                 Time we sent the last hello (NI only)                  |        
          |------------------------------------------------------------------------| 
   RCTIN  |                Time we got protocol up from controller                 |        
          |------------------------------------------------------------------------| 
   RCTM3  |                          Hello message timer                           |        
          |------------------------------------------------------------------------| 
          |               RCBSZ               |               RCRBS                |
          |Minimum of adjacencies' block sizes|Receive block size for this circuit |
          |------------------------------------------------------------------------| 
          |               RCMXR               |               RCNRO                |
          |  Maximum routers allowed on this  |     Number of routers online       |
          |              circuit              |                                    |
          |------------------------------------------------------------------------| 
   RCDSH  |               ID of current designated router (NI only)                |        
          |------------------------------------------------------------------------| 
          |               RCDSL               |               RCPRI                |
          |  ID of current designated router  | Priority to be designated router   |
          |             (NI only)             |             (NI only)              |
          |------------------------------------------------------------------------|   /\   
   RCJSQ  |                  Queue header for jiffy resend queue                   | QH.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
   RCCMQ  |                            Messages queued                             |        



                                    316
                               MONITOR TABLES
                             RC-D36PAR (Cont.)


          |------------------------------------------------------------------------| 
   RCCLC  |                             Local messages                             | 
          |------------------------------------------------------------------------| 
   RCSLZ  |                   (0) Time stamp of when last zeroed.                  |        
          |------------------------------------------------------------------------| 
   RCCAP  |                (800) Arriving packets received (to NSP)                |        
          |------------------------------------------------------------------------| 
   RCCDP  |                (801) Departing packets sent (from NSP)                 |        
          |------------------------------------------------------------------------| 
   RCCAL  |                (802) Arriving congestion loss (to NSP)                 |        
          |------------------------------------------------------------------------| 
   RCCTR  |                     (810) Transit packets received                     |        
          |------------------------------------------------------------------------| 
   RCCTS  |                       (811) Transit packets sent                       |        
          |------------------------------------------------------------------------| 
   RCCTL  |                     (812) Transit congestion loss                      |        
          |------------------------------------------------------------------------| 
   RCCCD  |                       (820) Circuit down events                        |        
          |------------------------------------------------------------------------| 
   RCAJD  |                             Adjacency down                             |        
          |------------------------------------------------------------------------| 
   RCCIF  |                     (821) Initialization failures                      |        
          |------------------------------------------------------------------------| 
   RCBSX  |              (xxxx) Adjacency block size exceeded /output              |        
          +------------------------------------------------------------------------+ 

           For field RCFLG(0-5):
                   RCBCT      0    Broadcast circuit (should be bit 0)
                   RCSRM      1    Send routing message flag
                   RCEBU      2    Emergency buffer is in use
                   RCSHM      3    Send hello message
                   RCDSR      4    We are the designated router

           Field RCSTA     (6-8)   Circuit state
                     
|          Field RCCST    (9-20)   Circuit Cost
                   
|          Field RCDRT   (21-29)   Time before we assume DSR role














                                    317
                               MONITOR TABLES


                                 RC-PHYKNI

   RC is the structure for the NI read counters block.

   Defined in:  PHYKNI

                                            Format                                  

          +------------------------------------------------------------------------+ 
   RCBR   |                             Bytes received                             |   
          |------------------------------------------------------------------------| 
   RCBX   |                           Bytes transmitted                            |   
          |------------------------------------------------------------------------| 
   RCFR   |                            Frames received                             |   
          |------------------------------------------------------------------------| 
   RCFX   |                           Frames transmitted                           |   
          |------------------------------------------------------------------------| 
   RCMCB  |                        Multicast bytes received                        |   
          |------------------------------------------------------------------------| 
   RCMCF  |                       Multicast frames received                        |   
          |------------------------------------------------------------------------| 
   RCFXD  |                   Frames xmitted, initially deferred                   |   
          |------------------------------------------------------------------------| 
   RCFXS  |                    Frames xmitted, single collision                    |   
          |------------------------------------------------------------------------| 
   RCFXM  |                  Frames xmitted, multiple collisions                   |   
          |------------------------------------------------------------------------| 
   RCXF   |                           Transmit failures                            |   
          |------------------------------------------------------------------------| 
   RCXFM  |                       Transmit failure bit mask                        | *
          |------------------------------------------------------------------------| 
   RCCDF  |                      Carrier detect check failed                       |   
          |------------------------------------------------------------------------| 
   RCRF   |                            Receive failures                            |   
          |------------------------------------------------------------------------| 
   RCRFM  |                        Receive failure bit mask                        | * 
          |------------------------------------------------------------------------| 
   RCDUN  |                           Discarded unknown                            |   
          |------------------------------------------------------------------------| 
   RCD01  |                          Discarded position 1                          |   
          |------------------------------------------------------------------------| 
   RCD02  |                          Discarded position 2                          |   
          |------------------------------------------------------------------------| 
   RCD03  |                          Discarded position 3                          |   
          |------------------------------------------------------------------------| 
   RCD04  |                          Discarded position 4                          |   
          |------------------------------------------------------------------------| 
   RCD05  |                          Discarded position 5                          |   
          |------------------------------------------------------------------------| 
   RCD06  |                          Discarded position 6                          |   



                                    318
                               MONITOR TABLES
                             RC-PHYKNI (Cont.)


          |------------------------------------------------------------------------| 
   RCD07  |                          Discarded position 7                          |  
          |------------------------------------------------------------------------| 
   RCD08  |                          Discarded position 8                          |   
          |------------------------------------------------------------------------| 
   RCD09  |                          Discarded position 9                          |   
          |------------------------------------------------------------------------| 
   RCD10  |                         Discarded position 10                          |   
          |------------------------------------------------------------------------| 
   RCD11  |                         Discarded position 11                          |   
          |------------------------------------------------------------------------| 
   RCD12  |                         Discarded position 12                          |   
          |------------------------------------------------------------------------| 
   RCD13  |                         Discarded position 13                          |   
          |------------------------------------------------------------------------| 
   RCD14  |                         Discarded position 14                          |   
          |------------------------------------------------------------------------| 
   RCD15  |                         Discarded position 15                          |   
          |------------------------------------------------------------------------| 
   RCD16  |                         Discarded position 16                          |   
          |------------------------------------------------------------------------| 
   RCUFD  |                     Unrecognized frame destination                     |   
          |------------------------------------------------------------------------| 
   RCDOV  |                              Data overrun                              |   
          |------------------------------------------------------------------------| 
   RCSBU  |                       System buffer unavailable                        |   
          |------------------------------------------------------------------------| 
   RCUBU  |                        User buffer unavailable                         |   
          |------------------------------------------------------------------------| 
   RCRS0  |                 PLI reg rd par error,,PLI parity error                 |   
          |------------------------------------------------------------------------| 
   RCRS1  |                 MOVER parity error,,CBUS parity error                  |   
          |------------------------------------------------------------------------| 
   RCRS2  |               EBUS parity error,,EBUS queue parity error               |   
          |------------------------------------------------------------------------| 
   RCRS3  |                   Channel error,,Spur channel error                    |   
          |------------------------------------------------------------------------| 
   RCRS4  |              Spur xmit attn error,,CBUS req timout error               |   
          |------------------------------------------------------------------------| 
   RCRS5  |             EBUS req timeout error,,CSR grnt timeout error             |   
          |------------------------------------------------------------------------| 
   RCRS6  |             Used buff parity error,,xmit buff parity error             |   
          |------------------------------------------------------------------------| 
   RCRS7  |                           Reserved for uCode                           |   
          |------------------------------------------------------------------------| 
   RCRS8  |                           Reserved for uCode                           |   
          +------------------------------------------------------------------------+ 





                                    319
                               MONITOR TABLES
                             RC-PHYKNI (Cont.)



           0                            23 24 25 26 27 28 29 30 31 32            35
          +------------------------------------------------------------------------+
   RCXFM  |                               |  |  |  |  |  |  |  |  |                |
          +------------------------------------------------------------------------+


        Symbol    Bits     Contents

        RCLOC      24      Loss of carrier
        RCXBP      25      Xmit buffer parity error
        RCRFD      26      Remote failure to defer
        RCXFL      27      Xmitted frame too long
        RCOC       28      Open circuit
        RCSC       29      Short circuit
        RCCCF      30      Collision detect check failed
        RCEXC      31      Excessive collisions


           0                                    26 27 28 29 30 31                35
          +------------------------------------------------------------------------+
   RCRFM  |                                       |  |  |  |  |                    |
          +------------------------------------------------------------------------+


        Symbol    Bits     Contents

        RCFLE      27      Free list parity error
        RCNFB      28      No free buffers
        RCFTL      29      Frame too long
        RCFER      30      Framing error
        RCBCE      31      Block check error




















                                    320
                               MONITOR TABLES


                                       RD

        RD represents the format of the NI Receive Datagram command.

        Defined in:  PHYKNI

                                                 Format                                  

                                                20                                    35
               +------------------------------------------------------------------------+ 
               |                               |                 RDSIZ                  |
               |                               |        Text length + CRC (bytes)       |
               |------------------------------------------------------------------------| /\
        RDDA1  |                       Let program align the bytes                      | 2 
               \                                                                        \ \/
               |------------------------------------------------------------------------| /\
        RDSA1  |                                                                        | 2 
               \                                                                        \ \/
|              |------------------------------------------------------------------------| 
|              |                               |16                 RDPTY          |31   |
|              |                               |             Protocol type        |     |
|              |------------------------------------------------------------------------|
|              |                             |14                 RDPBA                35|
|              |                             |    Physical address of receive buffer    |
               |------------------------------------------------------------------------| /\
        RDVBA  |                    Virtual address of receive buffer                   | 2 
               \                                                                        \ \/
               |------------------------------------------------------------------------| 
        RDPID  |                                Portal ID                               |   
               |------------------------------------------------------------------------| 
        RDRID  |                               Request ID                               |   
               +------------------------------------------------------------------------+ 

                0          3 4                                                        35
               +------------------------------------------------------------------------+
        RDDA1  |            |         High-order destination address                    |
               +------------------------------------------------------------------------+
















                                    321
                               MONITOR TABLES
                                 RD (Cont.)


|  
|               0                            15 16                                 31 35
|              +------------------------------------------------------------------------+
|       RDDA1+1|                               |     Low-order destination address |    |
|              +------------------------------------------------------------------------+
|  
|               0          3 4                                                        35
|              +------------------------------------------------------------------------+
|       RDSA1  |            |         High-order source address                         |
               +------------------------------------------------------------------------+

                0                            15 16                                31  35
               +------------------------------------------------------------------------+
        RDSA1+1|                               |     Low-order source address      |    |
               +------------------------------------------------------------------------+





































                                    322
                               MONITOR TABLES


                              RES-FREE-SPACE

   Resident Free Space Storage.

   The resident free space pool is used by TOPS-20  for  allocating  free
   space  for  data  structures  such  as UDBs, CDBs, KDBs, and SDBs; for
   terminal messages and line dynamic data blocks; and for the TIMER JSYS
   when it builds a job's run-time limit block.  (See JOBRTL table).

   Defined in:  STG

   There are 2 resident free spaces - one in section 0/1 and  one  in  an
   extended  section.  The following data structure describes each of the
   free spaces.  The locations RES0TB and RESNTB contain the addresses of
   the  data  structures  for  section  0/1  space  and  extended  space,
   respectively.


           +-------------------------------------------------------+
   .REBAS  |             Starting address of free space            |
           |-------------------------------------------------------|
   .REEND  |           Address of last word of free space          |
           |-------------------------------------------------------|
   .RETOT  |           Total size of free space in blocks          |
           |-------------------------------------------------------|
   .REPR1  |   If space left is less than this, allocate P1 only   |
           |-------------------------------------------------------|
   .REGRO  |   If space left is less than this, grow free space    |
           |-------------------------------------------------------|
   .REBTB  |             Address of start of bit table             |
           |-------------------------------------------------------|
   .REBTL  |              Length of bit table (words)              |
           |-------------------------------------------------------|
   .RETFR  |         Total remaining unallocated blocks            |
           |-------------------------------------------------------|
   .REFFB  |     Number of block just past end of free space       |
           |-------------------------------------------------------|
   .REPMX  |                    Number pools                       |
           |-------------------------------------------------------|
   .REQTA  |    Address of block containing quota for each pool    |
           |-------------------------------------------------------|
   .REPFR  |Address of block containing count of unallocated blocks|
           +-------------------------------------------------------+          


   Offset .REBTB points to a bit table, each bit  representing  a  4-word
   block of free space - bit on means block in use.






                                    323
                               MONITOR TABLES
                           RES-FREE-SPACE (Cont.)


   Data structure pointed to by offset .REQTA, indexed by pool number.


|          +-------------------------------------------------------+
|          |          Quota for pool  (Offset 0 unused)            |   / \
|          |-------------------------------------------------------|    |
           |                            "                          |    |
           |-------------------------------------------------------|    |
           |                            "                          |    |
           |-------------------------------------------------------|  RESQTL
           |                            "                          |    |
           |-------------------------------------------------------|    |
           |                            "                          |    |
           |-------------------------------------------------------|    |
           |                            "                          |   \ /
           +-------------------------------------------------------+

   Data structure pointed to by offset .REPFR, indexed by pool number.

|          +-------------------------------------------------------+
|          |         Number of free blocks (Offset 0 unused)       |   / \
|          |-------------------------------------------------------|    |
           |                           "                           |    |
           |-------------------------------------------------------|    |
           |                           "                           |    |
           |-------------------------------------------------------|  RESQTL
           |                           "                           |    |
           |-------------------------------------------------------|    |
           |                           "                           |    |
           |-------------------------------------------------------|    |
           |                           "                           |   \ /
           +-------------------------------------------------------+


   Requests for Resident Free Space are given priority levels where:

   .RESP1=0  Highest priority and monitor always tries to  assign  space.
             Page faults are not allowed.
   .RESP2=1  Second level priority where monitor does not assign space if
             free  storage  would go below minimum (RESMIN).  Page faults
             are not allowed.
   .RESP3=2  Lowest priority and requests for  this  level  are  made  in
             process context.  Page faults are allowed.









                                    324
                               MONITOR TABLES
                           RES-FREE-SPACE (Cont.)


   Pool types and numbers as indicated by RESUTP are:

   .RESGP=1  General resident free space pool
   .RESTP=2  Terminal pool
   .RESNP=3  Network pool
   .RSTMP=4  TIMER pool
   .RESUP=5  UNITS pool - used by PHYSIO and DSKALC













































                                    325
                               MONITOR TABLES


                                    RI

   This is the DECnet LLMOP request block, which is used to make the  Job
   0 (CHKR) fork generate a System ID message on the NI.

   Defined in:  LLMOP

                                            Format                                  

          +------------------------------------------------------------------------+ 
   RIQUE  |                 Pointer to next item (Must be first!)                  |                
          |------------------------------------------------------------------------| 
          |               RIREC               |               RICHN                |
          |          Receipt number           |      Ethernet channel number       |
          |------------------------------------------------------------------------| /\
   RISAD  |                        Source Ethernet address                         | 2 
          \                                                                        \ \/
          +------------------------------------------------------------------------+ 



































                                    326
                               MONITOR TABLES


                        RIDSTS (REQUEST-ID STATUS)

   RIDSTS, indexed by CI node number, contains information regarding  the
   status  of CI request-id polling.  Also, if the remote node is an HSC,
   RIDSTS contains information about our attempts to reset/start it.
|  
|  Defined in:  PHYKLP
|  
|  
|          +-------------------------------------------------------+          / \
|  RIDSTS  |||||||| |||      |  IDNOR  |           IDSAD           | * Node 0  |
|          |-------------------------------------------------------|           |
|          \                                                       \    |      |
|          \                                                       \    |      |
|          \                                                       \    |    MAXNDS+1
|          \                                                       \    |      |
|          \                                                       \    |      |
|          |-------------------------------------------------------|           |
|          |                                                       |  Node 15  |
|          +-------------------------------------------------------+          \ /


   Bit      Name    Description

     0      IDSNT   Last Request-ID sent - 0 = path A, 1 = path B
     1      IDPAO   Path A Open - 0 = closed, 1 = open
     2      IDPBO   Path B Open - 0 = closed, 1 = open
     3      IDNRA   No-Response on Path A - 0 = response, 1 = no-response
     4      IDNRB   No-Response on Path B - 0 = response, 1 = no-response
     5      IDTRY   Last Try Status - 0 = first, 1 = second
     6      IDWFR   Waiting for  a  response  (from  our  port)  to  sent
                    request-id
     8      IDRST   Reset-remote command has been sent
     9      IDSTA   Start-remote command to be sent
|   10      IDMAI   Remote port is in maintenance mode
   12-17    IDNOR   Count of consecutive no-responses when  we  know  the
                    other port is receiving our request-ids
|  20-35    IDSAD   Starting address for remote node















                                    327
                               MONITOR TABLES


                                    RM

   This is structure RM, the DECnet router message.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   RMOCP  |                         Output circuit blk ptr                         |        
          |------------------------------------------------------------------------| 
   RMICP  |                         Input circuit blk ptr                          |        
          |------------------------------------------------------------------------| 
   RMOAP  |                        Output adjacency pointer                        |        
          |------------------------------------------------------------------------| 
   RMIAP  |                        Input adjacency pointer                         |        
          |------------------------------------------------------------------------| 
          | | | | | | | | | |     | | | | | |                                      |
          | |     RMFST     |     |  RMFLG  |                                      | *
          |------------------------------------------------------------------------|   /\   
   RMMSD  |                    Room for RTR message descriptor                     | MD.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|       /\       
   RMHDR  |                  RTR header room (** output only **)                   | <<RMH.LN+3>/4> 
          \                                                                        \       \/       
          |------------------------------------------------------------------------| 
   RMMK1  |                               First mark                               |                
          |------------------------------------------------------------------------| 
   RMMK2  |                              Second mark                               |                
          +------------------------------------------------------------------------+ 

           For field RMFST(1-8):
                   RMMZ1      1    Reserved (must be zero)
                   RMEVL      2    Evolution bit (reserved)
                   RMMZ2      3    Reserved (must be zero)
                   RMRTS      4    Being returned to sender
                   RMRQR      5    Return requested
                   RMMZ3      6    Reserved (must be zero)
                   RMMB1      7    Reserved (must be one)
                   RMCTL      8    Control message (not data)

           Field RMCTY     (9-11)  Control message type

           For field RMFLG(12-16):
                   RMODN      12   Local NSP doesn't want this local message  "ODN"ed
                   RMPH2      13   Message seems to be PHASE II
                   RMTRY      14   NSP wants Router to "TRYHARD" on the NI
                   RMTST      15   This is a test message
                   RMDRM      16   This message should be resent to multicast  "All-Endnodes"




                                    328
                               MONITOR TABLES


                                    RS

   RS defines the format of the NI Read Station command.

   Defined in:  PHYKNI

                                            Format                                  

          +------------------------------------------------------------------------+ 
   RSHAD  |                      High order ethernet address                       |   
          |------------------------------------------------------------------------| 
   RSLAD  |                       Low order ethernet address                       |   
          |------------------------------------------------------------------------| 
          |                                                               | | | |  |
          |                                                               | RSVAR  | *
|         |                              16             23 24       29 30        35
          |------------------------------------------------------------------------| 
          |                               |     RSUCV     |   RSNMC   |   RSNPT    |
          |                               | uCode version | Number of | Number of  |
          |                               |               | multicast | protocol   |
          |                               |               | addresses |   types    |
          |                               |               |  allowed  |  allowed   |
          +------------------------------------------------------------------------+ 

           For field RSVAR(32-35):
                   RSNOP      32   Receive MOP mode (unused)
                   RSPMC      33   Unrelated multicast mode
                   RSH40      34   H4000 mode
                   RSPRM      35   Unrelated mode
























                                    329
                               MONITOR TABLES


                                    RT

   RT is the DECnet Receive  Table  Definition,  which  is  used  by  the
   receive  message  routines  for  determining  how  to process incoming
   messages.  There is an RT entry in MSGTBL for every  type  of  message
   that DECnet-36 expects to receive.

   Defined in:  LLINKS

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | | | | |   |     |                 |               RTRTN                |
          |           |     |                 | Local addr of routine to process   | *
          |           |     |                 |                msg                 |
          +------------------------------------------------------------------------+ 

           For field RTFLG(0-5):
                   RTFLO      0    Msg type flow controlled, for CHKRSN
                   RTOTH      1    Set if this is "other" sublink
                   RTACK      2    Set if msg must include ACKNUM field
                   RTRSP      3    Set if sender expects a response

           Field RTUPT     (6-8)   The "upto" field, mod 3 bits for DDT





























                                    330
                               MONITOR TABLES


                                    SA

   SA is the Session Control Argument Block (SAB)  portion  of  a  DECnet
   message.

   Defined in:  D36PAR

                                            Format                                  

                            Start right after public portion of MB                  
          +------------------------------------------------------------------------+ 
          | | | | | | | | |       |           |               SAERR                | *
          |   SAFLG   |   SAMFG   |           |    Place to store error return     |
          |------------------------------------------------------------------------| 
          |               SANAG               |               SAAFN                |
          | Number of user arguments supplied |           Function code            |
          |------------------------------------------------------------------------| 
          |               SAAST               |               SAACH                |
          |          Status variable          |       Channel or job number        |
          |------------------------------------------------------------------------| 
   SAAA1  |                              Argument one                              |                
          |------------------------------------------------------------------------| 
   SAAA2  |                              Argument two                              |                
          |------------------------------------------------------------------------| 
   SAAA3  |                             Argument three                             |                
          |------------------------------------------------------------------------| 
   SASBP  |                        Pointer to string block                         |                
          |------------------------------------------------------------------------| 
   SACBP  |                        Pointer to connect block                        |                
          |------------------------------------------------------------------------| 
   SABCT  |                           Buffer byte count                            |                
          |------------------------------------------------------------------------| /\
   SABPT  |                Buffer byte pointer (possibly extended)                 | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   SASJB  |                  Pointer to session control job block                  |   
          |------------------------------------------------------------------------| 
   SASLB  |                 Pointer to session control link block                  |   
          |------------------------------------------------------------------------| 
   SASLT  |                Indirect table entry this SAB belongs in                |   
          |------------------------------------------------------------------------| 
   SAHBA  |                  Address of routine to perform HIBER                   |   
          |------------------------------------------------------------------------| 
   SAWKA  |                   Address of routine to perform WAKE                   |   
          |------------------------------------------------------------------------| 
   SAUID  |               SLB's serial number - for stale detection                |   
          +------------------------------------------------------------------------+ 






                                    331
                               MONITOR TABLES
                                 SA (Cont.)


           For field SAFLG(0-5):
                      
                   Symbol    Bit   Contents
                           
                   SAWAI      0    Wait if user wants (check NS.WAI)
                   SAEOM      1    End of message flag
                   SABOM      2    Beginning of message flag
                   SAKCB      3    Keep connect block for life of link
                   SABLK      4    HIBER routine has blocked. Room for future MONUSR flags 

           For field SAMFG(6-11):
                      
                   Symbol    Bit   Contents

                   SAEVA      6    User buffer in exec virtual addr space
                   SASAT      7    Data read satisfied Room for future monitor flags




































                                    332
                               MONITOR TABLES


                                 SB-LATSRV

   This is the LAT slot block data structure.  There is  one  slot  block
   for each active slot (terminal) session.  Slot blocks are created when
   a slot session is started  and  released  when  the  slot  session  is
   terminated.   Slot  blocks  are  pointed to by the Connect Block queue
   pointer CBSBQ.

   Defined in:  LATSRV

|                                           Format                                  
|  
|                                         SLOT BLOCK                                
|         +------------------------------------------------------------------------+ /\
|  SBLNK  |                    Queue link word (must be first)                     | 2 
|         \                                                                        \ \/
|         |------------------------------------------------------------------------| 
|         | | | | | | | | |                   |               SBATS                | *
|         |               SBFLG               |    Maximum attention slot size     |
|         |------------------------------------------------------------------------| 
|         |               SBMDS               |               SBSTA                |
|         |      Maximum slot data size       |            Slot state              |
|         |------------------------------------------------------------------------| 
|         |               SBRID               |               SBLID                |
|         |          Remote slot id           |           Local slot id            |
|         |------------------------------------------------------------------------| 
|         |               SBXCR               |               SBRCR                |
|         | Transmit credits available to us  | Receive credits still outstanding  |
|         |------------------------------------------------------------------------| 
|         |               SBREA               |               SBSRC                |
|         |  Reason code for stop or reject   |      Source slot name count        |
|         |------------------------------------------------------------------------|
|         |               SBPRC               |               SBSVC                |
|         |          Port name count          |          Service name count        |
|         |------------------------------------------------------------------------|
|  SBSRN  |                             Server Name                                | <<ML.SLN+4>/5>
|         |------------------------------------------------------------------------|
|  SBPRN  |                               Port Name                                | <<ML.SLN+4>/5>
|         |------------------------------------------------------------------------|
|  SBSVN  |                            Service Name                                | <<ML.SLN+4>/5>
|         |------------------------------------------------------------------------|  
|  SBTDB  |                          Terminal data block                           |                
|         |------------------------------------------------------------------------| 
|  SBCBA  |                  Circuit block address for this slot                   |                
|         |------------------------------------------------------------------------|
|  SBPRA  |                  Pending request block address                         |
|         +------------------------------------------------------------------------+ 






                                    333
                               MONITOR TABLES
|                            SB-LATSRV (Cont.)


|          For field SBFLG(0-17):
                             
|                  Symbol    Bit   Contents
                                  
|                  SBSDP      0    Slot data present (must be sign bit)
|                  SBREJ      1    Send REJECT Slot
|                  SBSTR      2    Send START Slot
|                  SBFOU      3    Flush output
|                  SBOUT      4    Output data available
|                  SBFCC      5    Flow control change
|                  SBSTO      6    Send STOP Slot(Must be last)
|                  SBDLP      7    This slot is a dialup line








































                                    334
                               MONITOR TABLES


                                 SB-PHYKNI

   This block exists in all NI Send Datagram commands;  it  starts  after
   the  SN  block.   If  the  datagram  is  BSD style, SBBBA contains the
   physical address of the first BSD.  The other fields in this block may
   be used by both BSD and non-BSD style sends.

   Defined in:  PHYKNI

                                            Format                                  

          +------------------------------------------------------------------------+ 
   SBBBA  |                        Physical BSD base address                       | 
          |------------------------------------------------------------------------| 
   SBPID  |                                Portal ID                               | 
          |------------------------------------------------------------------------| 
   SBMSD  |                               MSD pointer                              | 
          |------------------------------------------------------------------------| 
   SBRID  |                               Request ID                               | 
          |------------------------------------------------------------------------| /\
   SBBFA  |                             Buffer address                             | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| /\
   SBRES  |                       Pad out to 4 word boundary                       | 2 
          \                                                                        \ \/
          +------------------------------------------------------------------------+ 



























                                    335
                               MONITOR TABLES


                                 SB-SCPAR

   The String Block is used by DECnet-36 to store the user's string-block
   argument.

   Defined in:  SCPAR

                                            Format                                  

                                  The Internal String Block                         
          +------------------------------------------------------------------------+ 
          |               SBCNT               |               SBWDS                |
          |      Count of bytes in block      |The length in words of string block |
          |------------------------------------------------------------------------|       /\       
   SBDAT  |                       SB.MAX 8-bit bytes of data                       | <<SB.MAX+3>/4> 
          \                                                                        \       \/       
          +------------------------------------------------------------------------+ 




































                                    336
                               MONITOR TABLES


                        SBLIST (SYSTEM BLOCK LIST)

   The system block  list,  indexed  by  CI  node  number,  contains  the
   addresses  of  the system blocks for nodes on the CI.  These addresses
   point to the device-dependent portion of the KDB for that CI node.

   Defined in:  SCAMPI


|          +-------------------------------------------------------+ / \
|  SBLIST  |          Address of system block for node 0           |  |
|          |-------------------------------------------------------|  |
|          |          Address of system block for node 1           |  |
|          |-------------------------------------------------------|  |
|          |                                                       |  |
|          |                          .                            |  |
|          |                          .                            | C%SBLL
|          |                          .                            |  |
|          |                                                       |  |
|          |                                                       |  |
|          |-------------------------------------------------------|  |
|          |          Address of system block for node 15          |  |
|          +-------------------------------------------------------+ \ /






























                                    337
                               MONITOR TABLES


                           SCA CONNECTION BLOCK

   This is the format of the connection block used by  SCA  to  keep  the
   state of each connection which it is maintaining.

   Defined in:     SCAPAR

            +=======================================================+      /|\
   .CBANB=0 |             Address of next connect block             |       |
            |-------------------------------------------------------|       |
   .CBAPB=1 |           Address of previous connect block           |       |
            |-------------------------------------------------------|       |
   .CBSBA=2 |                 System block address                  |     .CBLEN
            |-------------------------------------------------------|       |
   .CBSBI=3 |  CBDNOD                   |     CBEXPR                |*      |
            |  Destination node number  |     Expected response     |       |
            |-------------------------------------------------------|       |
   .CBSTS=4 |    CBBKST                 |     CBCNST                |*      |
            |    Connect block state    |     Connection state      |       |
            |-------------------------------------------------------|       |
   .CBFLG=5 |                         Flags                         |*      |
            |-------------------------------------------------------|       |
   .CBSCI=6 | CBSCID                                                |       |
            |                   Source connect ID                   |       |
            |-------------------------------------------------------|       |
   .CBDCI=7 | CBDCID                                                |       |
            |                Destination connect ID                 |       |
            |-------------------------------------------------------|       |
   .CBADR=10|                SYSAP callback address                 |       |
            |-------------------------------------------------------|       |
   .CBBUF=11|  CBIMB                    | CBIDB                     |       |
            |  Message buffers to queue | Datagram buffers to queue |       |
            |-------------------------------------------------------|       |
   .CBNWQ=12|               Next entry on work queue                |       |
            |-------------------------------------------------------|       |
   .CBSPN=13\                                                       \       |
            \                  Source process name                  \       |
            \                                                       \       |
            |-------------------------------------------------------|       |
   .CBDPN=17\                                                       \       |
            \               Destination process name                \       |
            \                                                       \       |
            |-------------------------------------------------------|       |
   .CBDTA=23\                                                       \       |
            \              User supplied connect data               \       |
            \                                                       \       |
            |-------------------------------------------------------|       |
   .CBREA=27|  CBDDRE                   | CBSDRE                    |       |
            |  Dest. disconnect reason  | Source disconnect reason  |       |




                                    338
                               MONITOR TABLES
                        SCA CONNECTION BLOCK (Cont.)


            |-------------------------------------------------------|       |
   .CBMCD=30|    CBMNSC                 |  CBMNRC                   |       |
            |    Minimum send credit    |  Minimum receive credit   |       |
            |-------------------------------------------------------|       |
   .CBSCD=31|                      Send credit                      |       |
            |-------------------------------------------------------|       |
   .CBRCD=32|                    Receive credit                     |       |
            |-------------------------------------------------------|       |
   .CBPRC=33|                Pending receive credit                 |       |
            |-------------------------------------------------------|       |
   .CBRQC=34|                    Requeue credit                     |       |
            |-------------------------------------------------------|       |
   .CBRTC=35|                     Return credit                     |       |
            |-------------------------------------------------------|       |
   .CBNPO=36| CBNPO                     |  CBRCNT                   |       |
            | Packets on port command Q |  Reaping postponed count  |       |
            |-------------------------------------------------------|       |
   .CBDGR=37|     Number of datagram buffers on hardware queue      |       |
            |-------------------------------------------------------|       |
   .CBCDD=40|  CBCDD                                                |       |
            |              Number of dropped datagrams              |       |
            |-------------------------------------------------------|       |
   .CBLCK=41|           Interlock word for connect state            |       |
            |-------------------------------------------------------|       |
   .CBPND=42|     Interlock word for credit_request in progress     |       |
            |-------------------------------------------------------|       |
   .CBJNB=43|  CPJNB                                                |       |
            |     Address of next connection block for this fork    |       |
            |-------------------------------------------------------|       |
   .CBJPB=44|  CPJPB                                                |       |
            |   Address of previous connection block for this fork  |       |
            |-------------------------------------------------------|       |
   .CBMGJ=45|  CBMGJ                                                |       |
            |   Number of SCS% message receive buffers queued       |       |
            |-------------------------------------------------------|       |
   .CBDGJ=46|  CBDGJ                                                |       |
            |           Number of SCS% DG buffers queued            |       |
            |-------------------------------------------------------|       |
   .CBFRK=47|  CBFORK                   | CBJOB                     |       |
            |  Job number of owner job  | Fork number of owner fork |       |
            |-------------------------------------------------------|       |
   .CBTMQ=50| Pointer to top of message available queue (for SCS%)  |       |
            |-------------------------------------------------------|       |
   .CBBMQ=51|  CBBMQ                                                |       |
            | Pointer to bot of message available queue (for SCS%)  |       |
            |-------------------------------------------------------|       |
   .CBTDQ=52|  CBTDQ                                                |       |
            | Pointer to top of datagram available queue (for SCS%) |       |




                                    339
                               MONITOR TABLES
                        SCA CONNECTION BLOCK (Cont.)


            |-------------------------------------------------------|       |
   .CBBDQ=53|  CBBDQ                                                |       |
            | Pointer to bot of datagram available queue (for SCS%) |       |
            |-------------------------------------------------------|       |
   .CBTXQ=54|  CBTXQ                                                |       |
            |     Pointer to top of the DMA xfer complete queue     |       |
            |-------------------------------------------------------|       |
   .CBBXQ=55|  CBBXQ                                                |       |
            |     Pointer to bot of the DMA xfer complete queue     |       |
            |-------------------------------------------------------|       |
   .CBTEQ=56|  CBTEQ                                                |       |
            |          Pointer to top of the event queue            |       |
            |-------------------------------------------------------|       |
   .CBBEQ=57|  CBBEQ                                                |       |
            |          Pointer to bot of the event queue            |       |
            |-------------------------------------------------------|       |
   .CBTBQ=60|  CBTBQ                                                |       |
            |       Pointer to first buffer descriptor block        |       |
            |-------------------------------------------------------|       |
   .CBBBQ=61|  CBBBQ                                                |       |
            |       Pointer to  last buffer descriptor block        |       |
            |-------------------------------------------------------|       |
   .CBPS0=62|  CBPMG                    | CBPDG                     |       |
            |  PSI channel for messages | PSI channel for datagrams |       |
            |-------------------------------------------------------|       |
   .CBPS1=63|    CBPDA                  |  CBPEV                    |       |
            |    PSI channel for DMA    |  PSI channel for events   |       |
            +=======================================================+      \|/

            +-------------------------------------------------------+ 
   .CBSBI=3 |  CBDNOD                   |     CBEXPR                | 
            |  Destination node number  |     Expected response     | 
            +-------------------------------------------------------|


                          Contents of field CBEXPR

                  Symbol   Value       Meaning

                  .STORS     1         Connect response
                  .STARS     3         Accept response
                  .STRRS     5         Reject response
                  .STDRS     7         Disconnect response
                  .STCRS     11        Credit response








                                    340
                               MONITOR TABLES
                        SCA CONNECTION BLOCK (Cont.)


            +-------------------------------------------------------+
   .CBSTS=4 |    CBBKST                 |     CBCNST                |  
            |    Connect block state    |     Connection state      |
            +-------------------------------------------------------+

                          Contents of field CBBKST

                  Symbol   Value       Meaning

                  .BSFRE     1         Free
                  .BSALL     2         Allocate
                  .BSCNP     3         Connect pending
                  .BSACP     4         Accept pending
                  .BSRPN     5         Reject pending
                  .BSCRP     6         Credit pending
                  .BSDPN     7         Disconnect pending

                          Contents of field CBCNST

                  Symbol   Value       Meaning

                  .CSCLO     1         Closed (CLOSED) 
                  .CSLIS     2         Listening (LISTENING)
                  .CSCSE     3         Connect request was sent (CONNECTSENT)
                  .CSCRE     4         Connect request was received (CONNECTREC)
                  .CSCAK     5         Connect response was received (CONNECTACK)
                  .CSACS     6         Accept request was sent (ACCEPTSENT) 
                  .CSRJS     7         Reject request was sent (REJECTSENT)
                  .CSOPN     10        Connection is open (OPEN)
                  .CSDSE     11        Disconnect request was sent (DISCONNECTSENT)
                  .CSDRE     12        Disconnect request received (DISCONNECTREC)
                  .CSDAK     13        Disconnect response received (DISCONNECTACK) 
                  .CSDMC     14        Waiting for disconnect response (DISCONNECTMATCH)



















                                    341
                               MONITOR TABLES
                        SCA CONNECTION BLOCK (Cont.)


             0                                   13 14         35      
            +-------------------------------------------------------+
   .CBFLG=5 |               Flags             |      Reserved       |
            +-------------------------------------------------------+


                  Symbol   Bits        Contents

                  CBFNNC    0          Needs credit notify
                  CBFJSY    1          CB is for SCS% conn
                  CBFABT    2          CB has been aborted
                  CBFRAP    3          CB is to be reaped
                  CBFDCL    4          This was DC listener
                  CBFKIL    5          Fork has been killed
                  CBFMDC    6          Maint data CB
                  CBFCVC    7          Virtual circuit was closed
                  CBFSOB    8          Stuck on buffers
                  CBFPTC    9          Protocol completed
                  CBFERR    10         SC.ERR deferred
                  CBFDIS    11         SC.DIS deferred
                  CBFDRQ    12         SC.DRQ deferred
                  CBFSNM    13         SC.SNM deferred






























                                    342
                               MONITOR TABLES


|                      SCA BUFFER RETURNED TO CLUDGR
|  
|  This SCA message buffer gives CLUDGR the flexibility to  be  used  for
|  other functions, that can be added as they are needed.  The buffer has
|  the following setup for CLUDGR:
|  
|  Defined in:   CLUPAR
|  
|  
|                     SCA buffer returned to CLUDGR (.SSMGR)
|  
|              +---------------------------------------------------+
|              |                                                   |
|              |             Invisible SYSAP header                |
|              \                                                   \
|              +---------------------------------------------------+
|    .CLFLI -1 | Word used by CLUDGR to link SCA buffer together   |
|              +---------------------------------------------------+
     .PKFLI  +>|                                                   |
     0 ------+ |            SCA and port header area               |
               \                                                   \
               +---------------------------------------------------+
     .MHPKL    |                   Packet length                   |
               +---------------------------------------------------+
     .MHUDA  0 |   Packet # in group    |   # of packets total     |
               |       (.CLPKT)         |         (.CLTPK)         |
               +---------------------------------------------------+
     CLDFLG  1 | Flags (described below)|   Remote request number  |
               |       (.CLFLG)         |         (.CLREQ)         |
               +---------------------------------------------------+
     CLDFUN  2 |    Function code       |     Pointer to CLDATA    |
               |       (.CLFUN)         |         (.CLPTR)         |
               +---------------------------------------------------+
     CLDFRK  3 |     Fork number        |      CI node to reply    |
               |       (.CLFRK)         |         (.CLNOD)         |
               +---------------------------------------------------+
     CLDUSR  4 |    User number who requested this function        |
               |                    (.CLUSR)                       |
               +---------------------------------------------------+
               | Number of words needed to reassemble SCA buffers  |
     CLDLEN  5 |                    (.CLLEN)                       |
               +---------------------------------------------------+
     CLDATA  6 \           Function specific data                  \
               \                                                   \
               +---------------------------------------------------+








                                    343
                               MONITOR TABLES
                   SCA BUFFER RETURNED TO CLUDGR (Cont.)


                           CLDFLG Flags (Word 1)

        Symbol    Bits     Description

        CL%REQ     0       1=local CLUDGR to perform requested function
                           0=remote request

        CL%PRV     1       1=remote user has WHEEL or OPERATOR privileges
                           enabled

        CL%GAL     2       1=remote process is a GALAXY component

        CL%ERR     3       1=remote system error for the given function

                  4-17     Unused





































                                    344
                               MONITOR TABLES


                           SCA RING BUFFER ENTRY

   The SCA ring buffer is present in the monitor only if the monitor  has
   been  built with the flags DEBUG and SCARNG non-zero.  These flags are
   found in PROLOG.MAC.  Also, the bits that  are  set  in  the  location
   RNGSW  ultimately  controls  which  events  get  recorded  in the ring
   buffer.

   The following is the format of an SCA ring buffer entry.  The  symbols
   given  are  not offsets into the entire ring buffer.  They are offsets
   into a particular ring buffer entry.  The pointer to the current  ring
   buffer position is stored in RNGADR and the address of the most recent
   ring buffer entry is stored in RNGCUR.  The top of the ring buffer  is
   stored  in  RNGTOP  and  the  bottom  address is in RNGBOT.  The total
   number of entries written is in RNGNUM and the total size of the  ring
   buffer is in RNGSIZ.

   Defined in:     SCAPAR

             +=======================================================+
   .REHED=0  |  RNGHED                                               |  
             |                Entry header (-77,,-77)                |
             |-------------------------------------------------------|
   .REECL=1  |        RNGEVC             |      RNGLEN               |*
             |        Event code         |      Length of entry      |
             |-------------------------------------------------------|
   .REJRL=2  |                 Jacket routine label                  |
             |-------------------------------------------------------|
   .REFRL=3  |                 Feature routine label                 |
             |-------------------------------------------------------|
   .REPCC=4  |            PC of caller to feature routine            |
             |-------------------------------------------------------|
   .RETOD=5  |                        TODCLK                         |
             |-------------------------------------------------------|
   .REFEA=6  \                                                       \  
             \                 Feature specific data                 \  
             \                                                       \
             |-------------------------------------------------------|
             |            Address of start of this entry             |
             +=======================================================+













                                    345
                               MONITOR TABLES
                       SCA RING BUFFER ENTRY (Cont.)


             +-------------------------------------------------------+
   .REECL=1  |        RNGEVC             |      RNGLEN               |
             |        Event code         |      Length of entry      |
             +-------------------------------------------------------+


                          Contents of field RNGEVC

                  Symbol   Value       Meaning

                  SYSSCA   1           SYSAP to SCA events
                  SCASYS   2           SCA to SYSAP
                  BUFMAN   3           Buffer manipulation
                  PKTEVT   4           Packet transaction
                  PITRAN   5           PI transition
                  PORTQU   6           Port queue manipulation
                  INTLOK   7           Interlocks


      Contents of RNGSW - the flag word which controls event recording

                  Symbol   Bit         Meaning

                  RSYSCA    0          Record SYSAP to SCA events
                  RSCASY    1          Record SCA to SYSAP events 
                                        (callbacks)
                  RBUFMG    2          Record buffer management events
                  RPACKT    3          Record packet events (outgoing and
                                        incoming)
                  RPITRN    4          Record PI transitions
                  RPRTQU    5          Record port queue events
                  RINTLK    6          Record interlocks


                SCA ring buffer entry--Feature data (SYSSCA)

   Below is the format of the feature specific data for the SYSAP to  SCA
   ring buffer entry.

             +=======================================================+
   .RESNN=6  |                      Node number                      |
             |-------------------------------------------------------|
   .RESCB=7  |                 Connect block address                 |
             |-------------------------------------------------------|
   .RESST=10 |          .CBSTS (Block state,,Connect state)          |
             |-------------------------------------------------------|
   .RESFL=11 |                        .CBFLG                         |
             |-------------------------------------------------------|
   .RESSI=12 |              .CBSCI (Source connect ID)               |
             |-------------------------------------------------------|
   .RESDI=13 |            .CBDCI (Destination connect ID)            |
             +=======================================================+
                                    346
                               MONITOR TABLES
                       SCA RING BUFFER ENTRY (Cont.)


                SCA ring buffer entry--Feature data (SCASYS)

   Below is the format of the feature specific data for the SCA to  SYSAP
   (callback) ring buffer entry.

             +=======================================================+
   .RECNN=6  |                      Node number                      |
             |-------------------------------------------------------|
   .RECCB=7  |                 Connect block address                 |
             |-------------------------------------------------------|
   .RECCR=10 |                 Callback reason code                  |
             +=======================================================+

                SCA ring buffer entry--Feature data (BUFMAN)

   Below is the format of  the  feature  specific  data  for  the  buffer
   manipulation  ring  buffer  entry.  The .REBCT word can contain one of
   three values.  If the buffer is being returned, .REBCT contains a  -1.
   If  the  buffer is being created or allocated and it has been obtained
   successfully,  .REBCT  contains  the  number  of  buffers.    If   the
   allocation  was  not successful, .REBCT contains the number of refused
   requests (RMRCNT for messages, RDRCNT for  datagrams).   Also,  on  an
   unsuccessfull allocation attempt, the .REBAD word contains -1 since no
   buffer was allocated.  Otherwise, this word always contains  a  buffer
   address,  which  is  either  the  address of a newly created/allocated
   buffer chain or the address of a buffer just returned.

             +=======================================================+
   .REBCT=6  |    # of Buffers, or refused count, or -1 if returned  |
             |-------------------------------------------------------|
   .REBAD=7  |     Address of 1st buffer or -1 if can't allocate     |
             |-------------------------------------------------------|
   .REBMC=10 |    FQCNT (number of buffers on message free queue)    |
             |-------------------------------------------------------|
   .REBMT=11 |     TOPFQ (pointer to top of message free queue)      |
             |-------------------------------------------------------|
   .REBMB=12 |    BOTFQ (pointer to bottom of message free queue)    |
             |-------------------------------------------------------|
   .REBDC=13 |   DFQCNT (number of buffers on datagram free queue)   |
             |-------------------------------------------------------|
   .REBDT=14 |    TOPDFQ (pointer to top of datagram free queue)     |
             |-------------------------------------------------------|
   .REBDB=15 |   BOTDFQ (pointer to bottom of datagram free queue)   |
             +=======================================================+








                                    347
                               MONITOR TABLES
                       SCA RING BUFFER ENTRY (Cont.)


                SCA ring buffer entry--Feature data (PKTEVT)

   Below is the format  of  the  feature-specific  data  for  the  packet
   transaction  ring  buffer entry.  The flags word contains the PPD flag
   bits (F.RTB, F.SPM, F.RSP).  F.RSP tells you whether  the  packet  was
   locally  or  remotely generated (F.RSP) and indicates which connect ID
   is the one from the local system.  The mode of the packet is indicated
   by F.SPM.

   The message priority is the priority of the packet and ranges  from  a
   high priority of 0 to a low of 3.

             +=======================================================+
   .REPNN=6  |                      Node number                      |
             |-------------------------------------------------------|
   .REPCB=7  |                 Connect block address                 |
             |-------------------------------------------------------|
   .REPAD=10 |                    Packet address                     |
             |-------------------------------------------------------|
   .REPFL=11 |                         Flags                         |
             |-------------------------------------------------------|
   .REPMP=12 |     Message priority      |       Packet length       |
             |-------------------------------------------------------|
   .REPTY=13 |             MH$TYP (credit,,message type)             |
             |-------------------------------------------------------|
   .REPSI=14 |              MH$SCI (Source connect ID)               |
             |-------------------------------------------------------|
   .REPDI=15 |            MH$DCI (Destination connect ID)            |
             +=======================================================+

                SCA ring buffer entry--Feature data (PITRAN)

   Below is the format of the feature specific data for the PI transition
   ring buffer entry.

             +=======================================================+
   .REPIC=6  |                        CHNCTL                         |
             |-------------------------------------------------------|
   .REPIF=7  |                        PIFLAG                         |
             +=======================================================+












                                    348
                               MONITOR TABLES
                       SCA RING BUFFER ENTRY (Cont.)


                SCA ring buffer entry--Feature data (PORTQU)

|  Below is the format of the feature specific data for  the  port  queue
|  manipulation ring buffer entry.

             +=======================================================+
   .REPQN=6  |                      Node number                      |
             |-------------------------------------------------------|
   .REPQF=7  |           Flags           |       Buffer count        |*
             |-------------------------------------------------------|
   .REPQB=10 |                    Buffer address                     |
             +=======================================================+
    

             +-------------------------------------------------------+
   .REPQF=7  |           Flags           |       Buffer count        |
             +-------------------------------------------------------+

                          Contents of flags field

                  Symbol   Bit         Meaning

                  RPQFLK    0          Link to port queue
                  RPQFMG    1          Message free queue used


                SCA ring buffer entry--Feature data (INTLOK)

   Below is the format of the feature specific  data  for  the  interlock
   ring buffer entry.

             +=======================================================+
   .REICB=6  |                 Connect block address                 |
             |-------------------------------------------------------|
   .REICL=7  |           Connect block lock value (.CBLCK)           |
             |-------------------------------------------------------|
   .REIFL=10 |             Connect block flags (.CBFLG)              |
             |-------------------------------------------------------|
   .REISL=11 |    Count of locked connect blocks on system block     |
             +=======================================================+












                                    349
                               MONITOR TABLES


                                   SCDB

   The MSCP Server Connection Data Block, which SCDBTB points to.

   Defined in:     PHYMVR

            +-------------------------------------------------------+
   .SVCIS=0 |                 Status of connection                  | *
            |-------------------------------------------------------|
   .SVCID=1 |                    Connect ID                         |
          . |-------------------------------------------------------|
   .SVTMO . |                 Time of last message                  |
          . |-------------------------------------------------------|
   .SVTV    |            Time-out interval set by driver            |
            |-------------------------------------------------------|
   .SVCMD   |                 Head of command queue                 |
            |-------------------------------------------------------|
   .SVSCL   |                Last SCA error location                |
            |-------------------------------------------------------|
   .SVSCE   |                  Last SCA error code                  |
            |-------------------------------------------------------|
   .SVCME   |                 Tail of command queue                 |
            +-------------------------------------------------------+

             0           5 6                                      35
            +-------------------------------------------------------+
   .SVCIS   |             |                                         |
            +-------------------------------------------------------+

        Symbol    Bits     Meaning

        SVSTA     0-5      State of the connection, which can be:

                SCLIS==0   Null or listening.  NOTE:  Must be state 0

                SCWOK==1   Waiting for OK to send

                SCOKS==2   OK to send

                SCDIS==3   Shutdown - Disconnect (SCA function .SSRID)

                SCNOF==4   Shutdown - Node offline (SCA function .SSNWO)

                SCPBC==5   Shutdown - Port error (SCA function .SSPBC)

                SCFSD==6   Shutdown - Due to internal error or protocol

        MCATN      6       Attention messages enabled





                                    350
                               MONITOR TABLES


                                  SCDBTB

   Table of pointers to MSCP server connection data blocks.

   Defined in:     STG

           +-------------------------------------------------------+
   SCDBTB: |        Address of server connection data block        |  /|\
           |                                                       |   |
           |                                                       |   |
           |                                                       | CFSNUM
           |                                                       |   |
           |                                                       |   |
           \                                                       \  \|/
           +-------------------------------------------------------+






































                                    351
                               MONITOR TABLES


                              SCHED-VARIABLES

   This storage contains the variables used  in  the  SCHED  module.   It
   contains pointers to the GOLST and to the wait lists.  Clock and other
   parameters needed are also contained.

   Defined in:  STG, SCHED, APRSRV

                                   Format

           +-------------------------------------------------------+
   SKDPDL: |                  Scheduler local PDL                  | / \
           |                                                       | NSKDP
|          |                                                       |  =700
           \                                                       \ \ /
           +-------------------------------------------------------+
   SCKATM: |         Alarm time - min. of all SCHED clocks         |
           +-------------------------------------------------------+
   OLDTCK: |  Alarm time - old time - used to calculate interval   |
           +-------------------------------------------------------+
   PISC7R: |                                                       | / \
           |                                                       |  4
           |                                                       |  |
           \                                                       \ \ /
           +-------------------------------------------------------+
   PI7AC1: |                    Temps at PISC7                     | / \
           |                                                       |  2
           |                                                       | \ /
           +-------------------------------------------------------+
   ALARMT: |             Min. time of forks on clklst              |
           +-------------------------------------------------------+
   SKDTHS: |            Time in SCHED so far this pass             |
           +-------------------------------------------------------+
   SKDLST: |               Last reading of HP clock                |
           +-------------------------------------------------------+
   SKDLRT: |      Runtime of last trip thru scheduling cycle       |
|          +-------------------------------------------------------+
|  NULJBF: |           Non-zero if running null job                |
           +-------------------------------------------------------+
   SNPSV1: | Place to save AC while ck'ing PC for SNOOP break pt.  |
           +-------------------------------------------------------+
   LSTPFK: |               Last Fork Scheduled                     |
           +-------------------------------------------------------+
   LFORKX: |         Last Fork Before Background Tasks             |
           +-------------------------------------------------------+
   FORKX:  |            Index of currently running fork            |
           +-------------------------------------------------------+
   FREJOB: |             Pointer to list of free jobs              |
           +-------------------------------------------------------+
   WTLST:  |             Pointer to waiting fork list              |



                                    352
                               MONITOR TABLES
                          SCHED-VARIABLES (Cont.)


           +-------------------------------------------------------+
   WT2LST: |    Pointer to waiting forks to be waked by UNBLK1     |
           +-------------------------------------------------------+
   TTILST: |    Pointer to list of forks waiting for TTY input     |
           +-------------------------------------------------------+
   TTOLST: |         Pointer to list of TTY output events          |
           +-------------------------------------------------------+
   FRZLST: |        Pointer to list waiting for unfreezing         |
           +-------------------------------------------------------+
   TRMLST: | Pointer to list waiting for inferior fork termination |
           +-------------------------------------------------------+
   CLKLST: |           Pointer to list waiting for Clock           |
           +-------------------------------------------------------+
   JTLST:  |                   JSYS traps queue                    |
           +-------------------------------------------------------+
   JTLSTL: |Linked list of forks wait on JTLCK to PSI some mon fork|
           +-------------------------------------------------------+
   GOLST:  |             Pointer to runnable fork list             |
           +-------------------------------------------------------+
   JB0FLG: |                   Run JOB 0 request                   |
           +-------------------------------------------------------+
   FRECB:  |                 Free core number bits                 |
           +-------------------------------------------------------+
   FREFK:  |                  List of free forks                   |
           +-------------------------------------------------------+
   SYSIFG: |         System has been initialized if not 0          |
           +-------------------------------------------------------+
   PWRDWN: |    Power failure detected if .g. 0, done if .l. 0     |
|          +-------------------------------------------------------+
|  SPWFFL: |    Spurious power fail if -1, restart if 0            |
           +-------------------------------------------------------+
   RLODPC: |               PCs for keep alive reload               | / \
           |                                                       |  4
           |                                                       |  |
           \                                                       \ \ /
           +-------------------------------------------------------+
   FPTABL: |          PAGEM dispatch for section numbers           | / \
|          |                                                       | HGHSEC
           |                                                       |  +1
           \                                                       \ \ /
           +-------------------------------------------------------+
   NBPROC: |          Number of processes in balance set           |
           +-------------------------------------------------------+
   NBWT:   |        Number waiting processes in balance set        |
           +-------------------------------------------------------+
   NBSWP:  |             Number of forks in swap wait              |
|          +-------------------------------------------------------+
|  NHOLDF: |        Number of forks in balance set mold            |
           +-------------------------------------------------------+
   MAXBP:  |           Max number of jobs in balance set           |


                                    353
                               MONITOR TABLES
                          SCHED-VARIABLES (Cont.)


           +-------------------------------------------------------+
   BSQNT0: |        Value of BSQNT at start of last running        |
           +-------------------------------------------------------+
   SUMNR:  |     Sum of reserve pages, all processes in memory     |
           +-------------------------------------------------------+
   SUMBNR: |          Sum of working sets in balance set           |
           +-------------------------------------------------------+
   NWSEPG: |          Number pages WSETs entering memory           |
           +-------------------------------------------------------+
   BALSHC: |   Count of pages in balance set because of sharing    |
           +-------------------------------------------------------+
   NXTCNF: |               Next fork to check - GCNO               |
           +-------------------------------------------------------+
   RELCB:  |    Mask of core numbers released but not cleared      |
           +-------------------------------------------------------+
   MAXNR:  |                  Max value of SUMNR                   |
           +-------------------------------------------------------+
   MAXHNR: |          Max NR of balance set holding forks          |
           +-------------------------------------------------------+
   BSLST:  |     Pointer to list of balance set holding forks      |
           +-------------------------------------------------------+
   NBSL:   |          Number of balance set holding forks          |
           +-------------------------------------------------------+
   NEBAL:  |     Number of processes now entering balance set      |
           +-------------------------------------------------------+
   REMFGS: |              Flags set on REMBSJ/REMBSF               |
           +-------------------------------------------------------+
   NPMAX:  |      Max number of pages in core for one proces       |
           +-------------------------------------------------------+
   SNPMAX: |           Small NPMAX for loaded conditions           |
           +-------------------------------------------------------+
   IRJAV:  |                Nearest integer to RJAV                |
           +-------------------------------------------------------+
   WSMTIM: |                  Time for next WSMGT                  |
           +-------------------------------------------------------+
   RWSOKF: |                 Flag - OK to do REMWS                 |
           +-------------------------------------------------------+
   NWSMEM: |                   Number WS in mem                    |
           +-------------------------------------------------------+
   NHQFK:  |               Number forks on non-maxq                |
           +-------------------------------------------------------+
   NLQFK:  |                 Number forks on maxq                  |
           +-------------------------------------------------------+
   SCHFLG: |              Permanent scheduling flags               |
           +-------------------------------------------------------+
   SKEDF1: |        Start process by way of CH7 break in 1         |
           +-------------------------------------------------------+
   SKEDF3: |              Process clock counted to 0               |
           +-------------------------------------------------------+
   SKEDFC: |         Force clear of balance set and memory         |


                                    354
                               MONITOR TABLES
                          SCHED-VARIABLES (Cont.)


           +-------------------------------------------------------+
   INSKED: |               In scheduler if non-zero                |
           +-------------------------------------------------------+
   SSKED:  |              Last job running was NOSKED              |
           +-------------------------------------------------------+
   SETPAG: |            Temp for setting pager at SCDR             |
           +-------------------------------------------------------+
   RSKCHK: |                   XPCW destination                    | / \
           |                                                       |  4
           |                                                       |  |
           \                                                       \ \ /
           +-------------------------------------------------------+
   PSKED:  |       Page transfer completed and dismiss job         |
|          +-------------------------------------------------------+
   QSKED:  |          Blocked fork now unblocked if .g. 0          |
           +-------------------------------------------------------+
   TSKED:  |             TTU output event if non-zero              |
           +-------------------------------------------------------+
   BSKED:  |      Fork voluntarily left balance set if .g. 0       |
           +-------------------------------------------------------+
   NGOJOB: |                Number of runnable jobs                |
           +-------------------------------------------------------+
   RJTTIM: |             Time at last update to RJTSUM             |
           +-------------------------------------------------------+
   RJATIM: |               Time of next RJAV update                |
           +-------------------------------------------------------+
   RJAVS1: |              RJTSUM at last RJAV update               |
           +-------------------------------------------------------+
   SKDFST: |       Minimize processing for fork scheduling         |
           +-------------------------------------------------------+
   BKIDLF: |                 Flags in Background,                  |
           |                   Charging IDLE                       |
           |-------------------------------------------------------|
   IDLFUG: |                 IDLE time (ms) for                    |
           |               Any Overflow of SKDIDL                  |
           |-------------------------------------------------------|
   GOLPWC: |       Number of wait credit boosts after BSWT         |
           +-------------------------------------------------------+
   SKDSHS: |               Number of BKGND1 cycles                 |
|          +-------------------------------------------------------+
|  SKDSHQ: |      Number of bad background decisions               |
           +-------------------------------------------------------+
   SKDBRM: |              Number of DISMT removals                 |
           +-------------------------------------------------------+
   SKDBSK: |             Number of DISMT successes                 |
           +-------------------------------------------------------+
   MXQNB0: |         Number of forks on MAXQ after NEWST3          |
           +-------------------------------------------------------+
   MXQGB0: |        Subset of MXQNB0 that got special boost        |



                                    355
                               MONITOR TABLES
                          SCHED-VARIABLES (Cont.)


|          +-------------------------------------------------------+  / \
|  SKDSHN: |            Count of times routine in SKDSHK           |   |
|          |                    changes NGOJOB                     | NSHAKL
|          \                                                       \  \|/
           +-------------------------------------------------------+
   RJAVS2: |              HQFSUM at last RJAV update               |  
           +-------------------------------------------------------+
   RJAVS3: |              LQFSUM at last RJAV update               |
           +-------------------------------------------------------+
   BSQNT:  |             Running job remaining quantum             |
           +-------------------------------------------------------+
   TIM1:   |                   SCHED fast clock                    |
           +-------------------------------------------------------+
   TIM2:   |                     Second clock                      |
           +-------------------------------------------------------+
   FKT0:   |               Clock at start of running               |
           +-------------------------------------------------------+
   FKT1:   |                 Time used since SETRT                 |
           +-------------------------------------------------------+
   TIM0:   |                 TODCLK atlast C1STAT                  |
           +-------------------------------------------------------+
   TODCLK: |      Millisecond clock, monotonically increasing      |
           +-------------------------------------------------------+
   TODPWL: |     Time of day (in seconds) by power line clock      |
           +-------------------------------------------------------+
   CHKTIM: |        Time at which JOB 0 considered overdue         |
           +-------------------------------------------------------+
   CHKDUE: |        Count of consecutive overdues for JOB 0        |
           +-------------------------------------------------------+
   DDPTIM: |         Time at which DDMP considered overdue         |
           +-------------------------------------------------------+
   DDPDUE: |        Count of consecutive overdues for DDMP         |
           +-------------------------------------------------------+
   SCDRN1: |              Run only job N if n .g. -1               |
           +-------------------------------------------------------+

















                                    356
                               MONITOR TABLES


                                  SCOUNT

   Subsystem Counts.  Each entry contains a count of times each subsystem
   is invoked.  This table is parallel to SNAMES.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+   / \
   SCOUNT: |                         Count                         |    |
           |-------------------------------------------------------|    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |  NNAMES
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           |                                                       |    |
           +-------------------------------------------------------+   \ /































                                    357
                               MONITOR TABLES


                                    SDB

   Structure  Data  Block.   This  block,  one  per  structure,  contains
   information  about  the  structure's units, master directory (that is,
   Root-Directory), bit map for disk  page  allocation/deallocation,  and
   assigned   swapping  area.   It  also  contains  mount  and  open-file
   information.  SDBBLO is the name of  the  storage  area  reserved  for
   handling  the SDB for the Public Structure (PS).  Individual Structure
   Data Blocks are pointed to by slots in STRTAB.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
           | STRNAM                                                |
   SDBNAM=0|              Structure Name (in SIXBIT)               |
           |-------------------------------------------------------|
           | STRNUM                                                |
   SDBNUM=1|             Number of Units in Structure              |
          .|-------------------------------------------------------|
          .| STRSIZ                                                |
   SDBSIZ .|         Size (in sectors) of Each Unit in Structure   |
           |-------------------------------------------------------|
           | STRSTS                    | STRJB                     |*
   SDBSTS  |          Status Flags     |     Initing Fork Number   |
           |-------------------------------------------------------|
           | STRRXB                                                |
   SDBRXB  |         Address of Root Directory Index Block         |
           |-------------------------------------------------------|
           | STRBXB                                                |
   SDBBXB  | Address of Backup Copy of Root Directory Index Block  |
           |-------------------------------------------------------|
           | STRNSS                                                |
   SDBNSS  |          Number of Swapping Sectors per Unit          |
           |-------------------------------------------------------|
           | STRFSS                                                |
   SDBFSS  |            First Swapping Sector per Unit             |
           |-------------------------------------------------------|
           | STRBTB                                                |
   SDBBTB  |                   OFN of Bit Table                    |
           |-------------------------------------------------------|
           | STRFC                                                 |
   SDBFRC  |           Count of Free Pages on Structure            |
           |-------------------------------------------------------|
           | STRRDO                    | STRIDX                    |
   SDBIDX  |   OFN of Root Directory   |   Handle of Index Table   |
           |-------------------------------------------------------|
           | STRLDN                                                |
   SDBLDN  |         Last Directory Number on This Structure       |



                                    358
                               MONITOR TABLES
                                SDB (Cont.)


           |-------------------------------------------------------|
           | STRLCA                                                |
   SDBLCA  |           Last Cylinder Assigned by DSKASN            |
           |-------------------------------------------------------|
           | STRCYL                                                |
   SDBCYL  |             Total Cylinders in Structure              |
           |-------------------------------------------------------|
           | STRB0                                                 |
   SDBBT0  |            Length of Top Half of Bit Table            |
           |-------------------------------------------------------|
           | STRB1                                                 |
   SDBBT1  |          Length of Bottom Half of Bit Table           |
           |-------------------------------------------------------|
           | STRTYP                                                |
   SDBTYP  |         Address of DSKSIZ Table for This Type of Disk |
           |-------------------------------------------------------|
           | STRUC               |STRUS| STRLK                     |
   SDBFLK  |  Unique Code in SDB |Str #| File Lock Count           |
           |-------------------------------------------------------|
           | STRMC                     | STROF                     |
   SDBCNT  |        Mount Count        |      Open File Count      |
           |-------------------------------------------------------|
           | STRMI                                                 |
   SDBPUC  |       Pack Unique Code for Media Identification       |
           |-------------------------------------------------------|
   SDBOMF  |                                                       |
           |       Original Minimum Free Page Limit                |
           |-------------------------------------------------------|
   SDBMXF  |                                                       |
           |       Boundary Above Which SDBMFP=SDBOMF              |
           |-------------------------------------------------------|
   SDBMFP  |                                                       |
           |   Min. Free Pgs. below which DSKASA Changes           |
           |              Assignment Algorithm                     |
           |-------------------------------------------------------|
   SDBALS  |                      Alias name                       |
           |-------------------------------------------------------|
   SDBTMR  | STRTMR                                                |
           |                 Structure Offline Timer               |
           |-------------------------------------------------------| / \
           | STRUDB                                                |  |
   SDBUDB  |           Flags                  Pointer to UDB       |  |
           |             .             |             .             | MXSTRU
           |             .             |             .             |  |
           \             .             |             .             \  |
           +-------------------------------------------------------+ \ /






                                    359
                               MONITOR TABLES
                                SDB (Cont.)


            0                             27                     35
           +-------------------------------------------------------+
   SDBSTS  | STRSTS                        | STRJB                 |
           |      Structure Status Flags   | Initializing Job #    |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        MS%PS       0      STPS        Structure is login structure
        MS%DIS      1      STDIS       Structure is being dismounted
        MS%DOM      2      STDOM       Structure is domestic
        MS%PPS      3                  Protected Permanent Structure
        MS%INI      4                  Structure is being initialized
        MS%LIM      5                  Structure is limited
        MS%NRS      6      STNRS       Structure is not regulated
        MS%RWS      7                  Read after write for swapping
        MS%RWD      8                  Read after write for data
        MS%ASG      9                  Disk assignments are prohibited
                                        (Bit table is bad)
        MS%MXB     10                  Bit table too large for monitor
                                        address space
        MS%CRY     11                  Enable password encryption
        MS%IDT     12                  Enable password invalidation by 
                                        date
        MS%IUS     13                  Enable password invalidation by 
                                        use
|       MS%DMP     14                  Structure is dumpable
|       MS%EXC     15      STEXL       Exclude structure from 
                                        multi-system access
        MS%IDX     16      STIDX       Index table file OFN has been
                                        set up
        MS%CRD     17      STCRD       Creating Root Directory on
                                        this Structure
        MS%OFS     18      STOFS       Structure is offline
        MS%BS      19      STBS        Structure is boot structure
                  20-26                Reserved for future expansion
                  27-35    STRJB       Initializing job   (only legal
                                        user while structure is being
                                        initialized)












                                    360
                               MONITOR TABLES


                                 SG-LLINKS

   The SG structure is used by DECnet for  extracting  the  SEGNUM  field
   from an NSP header.

   Defined in:  LLINKS

                                           Format                                  

                              The SEGNUM field in an NSP header                     
|                                                          24                     35
          +------------------------------------------------------------------------+ 
          |                                       | | |   |         SGNUM          |
          |                                       | | |   |    Segment number      | *
          +------------------------------------------------------------------------+ 

           Field SGDLY     (21-21)     ACK DELAY allowed

           Field SGMBZ     (22-23)     Must be zero


































                                    361
                               MONITOR TABLES


                                    SJ

   SJ is the DECnet Session Control  Job  Block  --  SJ.   There  is  one
   Session  Control  Job Block for every job with an open logical link on
   the system.

   Defined in:  D36PAR

                                            Format                                  

                                  Session Control Job Block                         
          +------------------------------------------------------------------------+ 
   SJNXT  |                        Next job block in system                        |        
          |------------------------------------------------------------------------| 
   SJCHT  |                 Ptr to SLB table (indexed by channel)                  |        
          |------------------------------------------------------------------------| 
   SJCHC  |                 Count of spaces allocated in SLB table                 |        
          |------------------------------------------------------------------------| 
   SJPSJ  |                 Pointer to system's pointer to the SJB                 |        
          |------------------------------------------------------------------------| 
          | | |             |      SJFRK      |               SJCTA                | *
          |      SJFLG      |(T20)Fork number |Number of CI timers active for job  |
          |------------------------------------------------------------------------|   /\   
   SJSLT  |                           Initial SLB table                            | SLT.LN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   SJTXQ  |                   Transaction queue of LLINKS calls                    | QH.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   SJPSQ  |                  Queue of SLBs with PSIs outstanding                   | QH.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------| 
          |               SJGOL               |               SJINQ                |
          |      Input data request goal      |          Job input quota           |
          |------------------------------------------------------------------------| 
          |               SJOTQ               |               SJINU                |
          |         Job output quota          |Buffers used toward input quota by  |
          |                                   |                job                 |
          |------------------------------------------------------------------------| 
          |               SJOTU               |                                    |
          | Buffers used toward output quota  |                                    |
          |              by job               |                                    |
          |------------------------------------------------------------------------| 
   SJSAB  |                            SA block pointer                            |        
          |------------------------------------------------------------------------| 
   SJPRT  |                (T20)Pointer to the port indirect table                 |        
          |------------------------------------------------------------------------| 
   SJMXP  |                   (T20)Number of slots in port table                   |        
          +------------------------------------------------------------------------+ 

           For field SJFLG(0-8):
                   SJBLK      0    (T20)This fork is blocked
                   SJRST      1    Reset in progress
                                    362
                               MONITOR TABLES


                                    SL

   This is the DECnet Session Control Link Block.  It  contains  all  the
   per-logical link data.

   Defined in:  D36PAR

                                            Format                                  

                                  Session control link block                        
          +------------------------------------------------------------------------+ 
   SLASQ  |                       Next SLB on all SLBs queue                       |        
          |------------------------------------------------------------------------| 
   SLNXP  |                        Next SLB with active PSI                        |        
          |------------------------------------------------------------------------| 
   SLJFQ  |                   Next SLB with active jiffy request                   |        
          |------------------------------------------------------------------------| 
   SLSLB  |                       Check pointer to this SLB                        |        
          |------------------------------------------------------------------------| 
   SLSJB  |                       Pointer to job block (SJB)                       |        
          |------------------------------------------------------------------------| 
   SLCHN  |                      Channel number (starts at 1)                      |        
          |------------------------------------------------------------------------| 
          |               SLDOB               |               SLSOB                |
          |      Destination object type      |        Source object type          |
          |------------------------------------------------------------------------| 
          | | | | | | | | | | | |             |   SLSTA   |     |     |            |
|         |               SLFLG               |  Session  |SLXFL|SLRFL|            | *
          |                                   |  control  |     |     |            |
          |                                   |   state   |     |     |            |
          |------------------------------------------------------------------------| 
          |               SLGOL               |               SLINQ                |
          |     Receive data request goal     |       Input quota for link         |
          |------------------------------------------------------------------------| 
          |               SLOTQ               |               SLINU                |
          |       Output quota for link       |       Input buffers in use         |
          |------------------------------------------------------------------------| 
          |               SLOTU               |               SLSST                |
          |       Output buffers in use       |         Link status word           |
          |------------------------------------------------------------------------| 
          |               SLPSM               |                                    |
          |           The PSI mask            |                                    |
          |------------------------------------------------------------------------|   /\   
   SLNSL  |                            "Normal" sublink                            | SS.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   SLOSL  |                            "Other" sublink                             | SS.LEN 
          \                                                                        \   \/   





                                    363
                               MONITOR TABLES
                                 SL (Cont.)


          |------------------------------------------------------------------------| 
          |               SLDRR               |               SLRSN                |
          | Normal data requests to resend at |   Reason code of disconnect or     |
          |            clock level            |         reject (16 bits)           |
          |------------------------------------------------------------------------| 
   SLPID  |                             NSPpid of port                             |        
          |------------------------------------------------------------------------| 
          |               SLDNA               |               SLSIZ                |
          |     Destination node address      |       Segment size in bytes        |
          |------------------------------------------------------------------------| 
   SLCTM  |                         Connect initiate timer                         |        
          |------------------------------------------------------------------------| 
   SLWKA  |                       Address of wakeup routine                        |        
          |------------------------------------------------------------------------| 
   SLCDM  |                   Ptr to connect/disconnect message                    |        
          |------------------------------------------------------------------------| 
   SLCBP  |               Pointer to connect block for passive task                |        
          |------------------------------------------------------------------------| 
   SLOTM  |                 Ptr to partially filled output message                 |        
          |------------------------------------------------------------------------| 
   SLUID  |                  Serial number - for stale detection                   |        
          |------------------------------------------------------------------------| 
          |               SLBYS               |               SLBYR                |
          |          User bytes sent          |        User bytes received         |
          |------------------------------------------------------------------------| 
          |               SLPKS               |               SLPKR                |
          |         Packets sent out          |         Packets recieved           |
          +------------------------------------------------------------------------+ 

           For field SLFLG(0-17):
                   SLCCB      0    Check connect block
                   SLKCB      1    Keep connect block for life of link
                   SLPSI      2    PSI pending flag
                   SLPH2      3    Phase II has no resend capability
                   SLABO      4    Trying to close after abort & release
                   SLFSL      5    Free the SLB when done with all processing
                   SLBSY      6    SLB is busy (cannot be freed)
                   SLLBC      7    Link is being closed by NSP
                   SLJFR      8    Jiffy request outstanding
                   SLEOM      9    Last segment output was end of message
                   SLPAS      10   Set if this SLB belongs to a passive task

           Field SLXFL     (24-26) Transmit flow control option

           Field SLRFL     (27-29) Receive flow control option







                                    364
                               MONITOR TABLES


                                    SN

   SN is the common portion of the NI Send  Datagram  command  block  for
   both BSD and non-BSD style sends.

   Defined in:  PHYKNI

                                            Format                                  

|         +------------------------------------------------------------------------+ 
|         |                                         |20            SNTXL         35|
|         |                                         |        Text Length (bytes)   |
|         |------------------------------------------------------------------------| 
|         |                                |16               SNPTY          31|    |
|         |                                |            Protocol Type         |    |
|         |------------------------------------------------------------------------| 
   SNFRQ  |                       Free queue header address                        | 
          |------------------------------------------------------------------------| 
   SNHAD  |                           High order address                           | 
          |------------------------------------------------------------------------| 
   SNLAD  |                               Low order                                | 
          +------------------------------------------------------------------------+ 































                                    365
                               MONITOR TABLES


                                  SNAMES

   Subsystem Names.  Each entry contains a subsystem program name.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   SNAMES: |                     SIXBIT/Name/                      |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |
           |                           .                           | NNAMES
           |                           .                           |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \  |
           +-------------------------------------------------------+ \ /






























                                    366
                               MONITOR TABLES


                                  SNBLKS

   Subsystem Blocks.  Each entry contains the  number  of  blocks  for  a
   subsystem program.  This table is parallel to SNAMES.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   SNBLKS: |                   Number of Blocks                    |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |
           |                           .                           | NNAMES
           |                           .                           |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \  |
           +-------------------------------------------------------+ \ /





























                                    367
                               MONITOR TABLES


                                  SPFLTS

   Subsystem Page Faults.  Each entry contains the accumulated number  of
   page  faults  of  a  subsystem  program.   This is a parallel table to
   SNAMES.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   SPFLTS: |                Accumulated Page Faults                |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           | 
           |                           .                           | NNAMES
           |                           .                           |  
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \  |
           +-------------------------------------------------------+ \ /




























                                    368
                               MONITOR TABLES


                                    SPT

   Special Pages Table.  This table is pointed to by the  firmware's  SPT
   Base  Register  (an  AC  in an AC Block reserved for hardware/firmware
   registers) which is setup by  the  monitor  at  system  initialization
   time.

   It is referenced directly by the paging  firmware  (bits  12-35  only)
   when  virtual  to  physical address translation takes place and shared
   and indirect pointers are involved.

   The first part of the table (of length NOFN) is used to point to index
   blocks  in  memory (or swapping area) for open files and an index into
   this part is often referred to as an  OFN  (Open  File  Number).   The
   remainder  of  the  table is used to point to PSBs, JSBs, UPTs, UPTAs,
   (User Page Map Tables), and shared file pages.

   The ALOCX value in  the  OFN  area  is  used  as  an  index  into  the
   allocation  tables  (ALOC1  &  ALOC2)  to obtain information about the
   directory of the open file, (that is, pages left in quota).  The share
   count  in  the non - OFN area is indexed for each sharing of the page.
   Unused SPT slots are kept in a free list.  Location FRESPT contains  a
   pointer to the head of the free list.

   Defined in:  STG, PROLOG

                                   Format

           +-------------------------------------------------------+
   SPT:    |0 ALOCX        11|12 STGADR                          35|  / \ / \
           |    Index into   |         Storage Address             |   |   |
           | Allocation TBL  |         (Index Block Page)          |   |   |
           |-------------------------------------------------------|       |
           |                            .                          | OFN # |
           |                            .                          |       |
           |                            .                          |   |   |
           |                            .                          |   |   |
           \                                                       \  \ /  |
           |-------------------------------------------------------|
           | SPTSHC        11|12   STGADR                        35|     SSPT
           |  Shared Count   |           Storage Address           |    (2560)
           |                 | (Shared File Pg/Ovhd Pg/Page of     | *
           |                 |           another Pg Tbl            |       |
           |-------------------------------------------------------|       |
           |                            .                          |       |
           |                            .                          |       |
           |                            .                          |       |
           |                            .                          |       |
           \                                                       \       |
           +-------------------------------------------------------+      \ /



                                    369
                               MONITOR TABLES
                                SPT (Cont.)


                              Storage Address


        Symbol    Bits     Pointer     Contents

                  12-35    STGADR      Storage address
                                       (Interpretation follows)
        NCORTM    12-17                Non-Core Test Mask yielding
                                       type of storage.
                                       Bits <12-17>=0 =>
                                       Bits <18-35>=Memory Pg Adr.
                                       Bits <12-17> 0 =>
                                       Bits <18-35>=Drum/DSK Adr.
        DSKAB     14                   Storage address is a disk
                                       address
        DSKNB     15                   Temporary bit used with
                                       DSKAB to say that disk
                                       address is newly assigned. 
        DRMAB     16-17                Storage address is a drum
                                       address
        DRMOB     17                   Used with DRMAB to indicate
                                       that the swapping area has
                                       overflowed to the disk file
                                       system.  (Since TOPS-20 cur-
                                       rently uses only the disk file
                                       system for swapping, a drum
                                       storage address always 
                                       has bits 16  17 set.)
        UAABC     17&35                Temporary bit used by the
                                       monitor's page trap handler
                                       when a copy-on-write page
                                       trap has occurred.  If the
                                       page to be copied is a drum
                                       address, it is faulted
                                       in before these bits are used,
                                       avoiding conflict over bit
                                       17.  These bits signify
                                       to a lower level routine,
                                       SWPIN, that the page just
                                       gotten from the free list
                                       has no backup address and 
                                       that it is to get a copy of
                                       another page.









                                    370
                               MONITOR TABLES


                                   SPTD

   This table is parallel to the OFN area of the SPT table  and  contains
   the  count  and  address of preallocated pages for an OFN.  The system
   may preallocate pages for an OFN to reduce assignment overhead.

|  Defined in:     STG, PROLOG

   Index:  OFN Number

           +--------------------------------------------------------+  / \
           |0       SPTCT       11|12       Storage Address       35|   |
           | Preallocation count  |     of next preallocated page   |   |
           |--------------------------------------------------------|   |
           |                           .                            |  NOFN
           |---------------------------.----------------------------|   |
           |                           .                            |   |
           |---------------------------.----------------------------|   |
           |                           .                            |  \ /
           +--------------------------------------------------------+

































                                    371
                               MONITOR TABLES


                                   SPTH

   Special Pages Table Home Information.  This table, parallel to the SPT
   table  is  referenced  only  by  the  software and is divided into two
   parts.  The first part, indexed by OFN, is used to point to  the  home
   address  of  each  open file (that is, to its index block) and to hold
   status information about each OFN.

   The second part is used mainly to  show  the  page's  origin.   For  a
   shared  file,  this  is  indicated  by OFN ,, Page Number , where page
   number is within open file, OFN.  For PSBs, JSBs, and UPTs,  the  SPTH
   word  contains  0 ,, Fork Index.  The free slots in this part are on a
   list chained through the SPT where the free list  pointer  resides  in
   FRESPT.

|  Defined in:  STG, PROLOG

                                   Format

           +-------------------------------------------------------+
   SPTH:   |       Flags         |Home (DSK)Address of Index Block |* / \ / \
           |-------------------------------------------------------|   |   |
           |                           .                           |   |   |
           |                           .                           | OFN # |
           |                           .                           |   |   |
           |                           .                           |   |   |
           \                           .                           \  \ /  |
           |-------------------------------------------------------|       |
           |            OFN            |        Page Number        |      SSPT
           |-------------------------------------------------------|       |
           |                          or                           |       |
           |-------------------------------------------------------|       |
           |             0             |        Fork Index         |       |
           |-------------------------------------------------------|       |
           |                           .                           |       |
           \                           .                           \       |
           +-------------------------------------------------------+      \ /


            0 1 2 3 4 5 6 7 8 9 0 1 2 3 14                       35
   SPTH    +-------------------------------------------------------+
   OFN     | | | | | | | | | | | | |   |  Address of Index Block   |
   entry   +-------------------------------------------------------+










                                    372
                               MONITOR TABLES
                                SPTH (Cont.)


             Symbol        Bits        Content

|            FILUB           0         Unrestricted bit
             FILWB           1         File write bit in SPTH and ASOFN
                                        argument
             THAWB           2         Thawed bit
             FILNB           3         "File new" bit
|            SPTLKB          4         OFN is locked against modification
             OFNWRB          5         OFN has been modified
             OFNBAT          6         Index block contains a bad block
             OFNERR          7         Error in file (that is, MPE)
             OFNDMO          8         OFN is on a dismounted structure
             OFNDUD          9         Suppress DDMP
             OFN2XB         10         Second level XB
|            OFNLAC         11         Lost access to this cached OFN

   If a file is OPENed with thawed access (OF%THW), then both  FILWB  and
   THAWB  is  set to 1.  If OPENed with restricted access, then the THAWB
   bit is on and the FILWB is off.

                                    NOTE

           A file is opened by searching the OFN part of SPTH for
           the  index block address.  If the address is found and
           the write and thawed bits are legal, it  is  a  shared
           opening and the same index is used.  If the address is
           not found, a new entry is made from one  of  the  free
           (-1) slots in SPTH.
























                                    373
                               MONITOR TABLES


                                   SPTO

   Special Pages Table O.  This table is parallel to the OFN area of  the
   SPT  table and contains the structure number and open file share count
   for each open file.  The OFN share count is indexed for  each  opening
   of the file and for each shared page within the open file.

|  Defined in:  STG, PROLOG

   Index:  OFN Number

                                   Format

           +-------------------------------------------------------+ / \
           |  OFNSHC                   |  STRX                     |* |
   SPTO:   |      OFN Share Count      |        Structure #        |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |
           |                           .                           | NOFN
           |                           .                           |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \  |
           +-------------------------------------------------------+ \ /


        Symbol    Bits     Pointer     Content

        OFNSCH     0-17                Share count for an OFN
                    17     OFSHR       One unit of OFN share entry
        STRX      18-35    STX         Structure index (number)




















                                    374
                               MONITOR TABLES


                                   SPTO2

   Special Pages Table O2.  This table is parallel to the OFN area of the
   SPT table and contains various state information about the OFN.  It is
   used by CFS to maintain the page state.

|  Defined in:  STG, PROLOG

   Index:  OFN number

           +--------------------------------------------------+   / \
|          |  OFOPC                 |                         |    |
   SPT02:  | Count of normal opens  |        CFS flags        |*   |
           |--------------------------------------------------|    |
           |                        |                         |    
           |------------------------.-------------------------|   NOFN    
           |                        .                         |   
           |--------------------------------------------------|    |
           |                        |                         |    |
           |--------------------------------------------------|   \ /

           +--------------------------------------------------+
           | Count of normal opens  |        CFS flags        |
           +--------------------------------------------------+

                           Contents of CFS flags

             Symbol        Bits        Meaning

             SPTFO          18         Force out in progress
             SPTCDO         19         XB checksum already verifed
             SPTSFD         20         XB needs checksum done on next swap in
             SPTDSF         21         Need DDMP to verify the XB
             SPTFR         22-23       Signal from CFS to do force-out
             SPTSR          22         Sub-field of above (set = memory flush)
             SPTNA          24         If set, don't preallocate pages for OFN
             SPTMR          25         Preallocation meter bit
|            OFNCSH         26         OFN is cached
|            OFNMGB         27         Garbage collection pass 1 done
             SPTST         34-35       OFN state (for CFS)

              .SPSRD==:1               ;Read-only
              .SPSWR==:2               ;Read/write










                                    375
                               MONITOR TABLES


                                   SPTO3

   Special Pages Table 3.  This table is parallel to the OFN area of  the
   SPT  table  and  is  available  only  under the DEBUG conditional.  It
   contains the number and the PC the system fork  who  last  locked  the
   OFN.

   Defined in:  STG

   Index:  OFN number

                                   Format

           +-------------------------------------------------------+  / \
|  SPTO3:  |       System Fork #       |         PC of fork        |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |  NOFN
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           +-------------------------------------------------------+  \ /































                                    376
                               MONITOR TABLES


                                   SPTO4

   This table contains information about OFNs.  It is primarily  used  to
   speed access to long files.

   Defined in:  STG

|  +-----------------------------------------------------------------------+ / \
|  | OFN which "own" this OFN,,file section number (for a second level OFN)|  |
|  |                               or                                      | NOFN
|  | 0 (for a short file or "super" OFN of a long file)                    |  |
|  |                               or                                      |  |
|  | -1 (if the OFN is unassigned)                                         |  |
|  +-----------------------------------------------------------------------+  |
|  |                                      .                                |  |
|  |                                      .                                |  |
|  |                                      .                                |  |
|  |                                      .                                |  |
|  |                                      .                                |  |
|  |                                      .                                |  |
|  |                                      .                                |  |
|  +-----------------------------------------------------------------------+ \ /































                                    377
                               MONITOR TABLES


                                    SS

   This is the DECnet Session Control sublink block.  There  are  two  of
   these  in  the  SL  block,  one for the normal sublink and one for the
   other sublink.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
          | |                                 |      SSXDO      |      SSRDO       |
          |               SSFLG               |Sublink transmit | Sublink receive  | *
          |                                   |DRQS outstanding |DRQS outstanding  | 
          |------------------------------------------------------------------------|   /\   
   SSINQ  |                          Sublink input queue                           | QH.LEN 
          \                                                                        \   \/   
          +------------------------------------------------------------------------+ 

           For field SSFLG(0-17):
                   SSOTH      0    Indicates this is the "other" sub-link
































                                    378
                               MONITOR TABLES


                                   SSIZE

   Subsystem Working Set Size.  Each entry contains the working set  size
   integral for a subsystem program.  This is a parallel table to SNAMES.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   SSIZE:  |               Working Set Size Integral               |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  
           |                           .                           | NNAMES
           |                           .                           |  
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \  |
           +-------------------------------------------------------+ \ /





























                                    379
                               MONITOR TABLES


                                    ST

   This is the SAB indirect table pointed to by PSBSAB.

   Defined in:  SCPAR

                                            Format                                  

          +------------------------------------------------------------------------+ 
   STNP   |                            Normal priority                             |                
          |------------------------------------------------------------------------| 
   STP1   |                              PSI level 1                               |                
          |------------------------------------------------------------------------| 
   STP2   |                                                                        |                
          |------------------------------------------------------------------------| 
   STP3   |                                                                        |                
          +------------------------------------------------------------------------+ 




































                                    380
                               MONITOR TABLES


                                  STIMES

   Subsystem Runtimes.  Each entry contains the accumulated runtime of  a
   subsystem program.  This is a parallel table to SNAMES.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   STIMES: |                  Accumulated Runtime                  |  |
           |-------------------------------------------------------|  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |
           |                           .                           | NNAMES
           |                           .                           |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                           .                           \  |
           +-------------------------------------------------------+ \ /





























                                    381
                               MONITOR TABLES


                                  STRTAB

   Structure Data Block Table.  This  table  contains  pointers  to  each
   structure data block in the system.

   Defined in:  STG

   Index:  Structure Number

                                   Format

           +-------------------------------------------------------+
   STRTAB: |                    Pointer to SDB                     |  / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | STRN =
|          |                           .                           |  64
           |                           .                           |   
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+
























                                    382
                               MONITOR TABLES


                                 SV-LLINKS

   The SV structure is expected to be used by DECnet code to  pull  apart
   the services field from a CI or CC message held in a register.

   Defined in:  LLINKS

                                            Format                                  

                             The Services Field of a CI or CC msg                   
|          0                                                            31
          +------------------------------------------------------------------------+ 
          |                             SVFL1                             |   |    |
          |                Filler 1, check for all zeroes                 |   |    | *
          +------------------------------------------------------------------------+ 

           Field SVOPT     (32-33) The flow control option, see FCM.xx

           Field SVFL2     (34-35) Filler 2, check for being "01"

                 SV$FL2=1  Number that SVFL2 must be
































                                    383
                               MONITOR TABLES


                                 SV-LLMOP

   This  is  the  DECnet  LLMOP  generic  server  variable  block.    The
   definition,  structure  and  use  of this block are shared between the
   Loopback Protocol Server and the Remote Console Server.

   Defined in:  LLMOP

                                            Format                                  

                                    Server Variable Block                           
          +------------------------------------------------------------------------+ 
   SVIFG  |                          Initialization Flag                           |        
          |------------------------------------------------------------------------| 
   SVDLS  |                            Data Link State                             |        
          |------------------------------------------------------------------------| 
   SVSTT  |                              Server State                              |        
          |------------------------------------------------------------------------| 
   SVAST  |                         Server Assistant State                         |        
          |------------------------------------------------------------------------| 
|         | |                      13       17     19                            35|
|         |S|                     |   SVICH   |   |             SVNXR              |
|         |V|                     | Interrupt |   |      Next Receipt Number       | 
|         |A|                     |  Channel  |   |                                | *
|         |I|                     | Number (0 |   |                                |
|         |C|                     |  to 35)   |   |                                |
          |------------------------------------------------------------------------| 
   SVQLK  |                              Queue Lock                                |        
          |------------------------------------------------------------------------| 
   SVRQH  |                           Request Queue Head                           |        
          |------------------------------------------------------------------------| 
   SVRQT  |                           Request Queue Tail                           |        
          |------------------------------------------------------------------------| 
   SVRCT  |                          Total Receive Count                           |        
          |------------------------------------------------------------------------| 
   SVTIC  |                      Total Invalid Receive Count                       |        
          |------------------------------------------------------------------------| 
   SVUSF  |                Total of unsupported functions received                 |        
          |------------------------------------------------------------------------| 
   SVSRC  |                          Server Receive Count                          |        
          |------------------------------------------------------------------------| 
   SVSIC  |                      Server Invalid Receive Count                      |        
          |------------------------------------------------------------------------| 
   SVRRC  |                        Requestor Receive Count                         |        
          |------------------------------------------------------------------------| 
   SVRIC  |                    Requestor Invalid Receive Count                     |        
          |------------------------------------------------------------------------| 
   SVTTI  |                     Total Transmit Initiated Count                     |        
          |------------------------------------------------------------------------| 
   SVTCT  |                     Total Transmit Complete Count                      |        



                                    384
                               MONITOR TABLES
                              SV-LLMOP (Cont.)


          |------------------------------------------------------------------------| 
   SVTTF  |                      Total Transmit Failure Count                      |        
          |------------------------------------------------------------------------| 
   SVSTC  |                         Server Transmit Count                          |        
          |------------------------------------------------------------------------| 
   SVRTC  |                        Requestor Transmit Count                        |        
          |------------------------------------------------------------------------| 
   SVBPC  |                           Buffer Post Count                            |        
          |------------------------------------------------------------------------| 
   SVLBC  |                           Lost Buffer Count                            |        
          |------------------------------------------------------------------------| 
   SVIBN  |                         Initial Buffer Number                          |        
          |------------------------------------------------------------------------| /\
   SVMCA  |                           Multicast Address                            | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   SVCJN  |                        Configurator Job Number                         |   
          |------------------------------------------------------------------------| 
   SVCFN  |                        Configurator Fork Number                        |   
          |------------------------------------------------------------------------|   /\   
   SVIXB  |                          DLL Interface Block                           | UN.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|   /\   
   SVCCB  |                    Start of Channel Counters Block                     | CC.LEN 
          \                                                                        \   \/   
          +------------------------------------------------------------------------+ 

           Field SVAIC     (0-0)   Assign Interrupt Channel
           Field SVICH     (13-17) Interrupt Channel Number
           Field SVNXR     (19-35) Next Receipt Number






















                                    385
                               MONITOR TABLES


                      SWAP-FREE-SPACE (NON-EXTENDED)

   Swappable Free Space Pool Format.  This  table  describes  the  header
   area that is used in the assignment and deassignment of swappable free
   space (by ASGFRE) and the usage of this space when assigned.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   SWPFRE: |   Adr of 1st Free Block   |          Unused           | / \
           |-------------------------------------------------------|  |
           |                  Lock on Free Space                   |  |
           |-------------------------------------------------------|  |
           |                     Space Counter                     |  |
           |-------------------------------------------------------|
           |                Most Common Block Size                 |  7
           |-------------------------------------------------------|
           |   Max Top of Free Area    |    Bottom of Free Area    |  |
           |-------------------------------------------------------|  |
           |                 Temporary Work Space                  |  |
           |-------------------------------------------------------|  |
           |                 Temporary Work Space                  | \ /
           |-------------------------------------------------------|
   SWFREE: |                    Free Space Pool                    | / \
           |                                                       |  |
           |        Space for the Assignment of:                   |  |
           |          System Wide Logical Name List and            | SWFREL
           |            Definitions Blocks                         |
           |          USAGE JSYS Blocks                            |  |
           |          Checkpoint Records                           |  |
           \                                                       \ \ /
           +-------------------------------------------------------+



















                                    386
                               MONITOR TABLES


                                  SYNMTB

   System Logical Name  Table:   This  table  contains  pointers  to  the
   initial ASCIZ strings for the system logical names.

   Defined in:  STG

                                   Format

           +-------------------------------------------------------------+
    SYNMTB:| XWD[ASCIZ/SYS/],[ASCIZ/      <SUBSYS>/]                     |
           |-------------------------------------------------------------|
           | XWD[ASCIZ/HLP/],[ASCIZ/SYS:/]                               |
           |-------------------------------------------------------------|
           | XWD[ASCIZ/SYSTEM/],[ASCIZ/      <NEW-SYSTEM,      <SYSTEM>/]|
           |-------------------------------------------------------------|
           | XWD[ASCIZ/EDITOR/],[ASCIZ/SYS:EDIT.EXE/]                    |
           |-------------------------------------------------------------|
           | XWD[ASCIZ/ACCOUNT],[ASCIZ/      /ACCOUNTS/]                 |
           |-------------------------------------------------------------|
           | XWD[ASCIZ/DEFAULT-EXEC/],[ASCIZ/SYSTEM:EXEC.EXE/]           |
           |-------------------------------------------------------------|
           | XWD[ASCIZ/PS/],[ASCIZ/      :/]                             |
           |-------------------------------------------------------------|
           | XWD[ASCIZ/POBOX/],[ASCIZ/      :/]                          |
|          |-------------------------------------------------------------|
|          | XWD[ASCIZ/BS/],[ASCIZ/      :/]                             |
|          |-------------------------------------------------------------|
|          | XWD[ASCIZ/SPOOL/],[ASCIZ/      :<SPOOL>/]                   |
|          |-------------------------------------------------------------|
|          | XWD[ASCIZ/SERR/],[ASCIZ/      :<SYSTEM-ERROR>/]             |
|          |-------------------------------------------------------------|
|          | XWD[ASCIZ/TGHA-DATA/],[ASCIZ/      :<SYSTEM>/]              |
           +-------------------------------------------------------------+

             When six spaces precede the colon, SLNINI inserts  the  name
             of the primary structure into that location.
















                                    387
                               MONITOR TABLES


                            SYS-STARTUP-VECTORS

   System Startup Transfer Vectors.  This table,  in  resident  locations
   140-147,  contains  the  startup  vectors  for  the monitor as well as
   vectors to enter EDDT.

   Defined in:  STG

                                   Format

   SVECT=140
           +-------------------------------------------------------+
   EVDDT:  |                 JRST DDTZ     (EDDT)                  |
           |-------------------------------------------------------|
           |               JRST SYSDDT     (Reset and go to EDDT)  |
           |-------------------------------------------------------|
   EVDDT2: |                 JRST DDTZ     (Copy of EDDT in case   |
           |                                other clobbered)       |
           |-------------------------------------------------------|
   EVSLOD: |               JRST SYSLOD     (Initialize disk file   |
           |                                 system)               |
           |-------------------------------------------------------|
   EVVSM:  |               JRST SYSVSM     (Verify swappable       |
           |                                 monitor on startup)   |
           |-------------------------------------------------------|
   EVRST:  |               JRST SYSRST     (Restart)               |
           |-------------------------------------------------------|
   EVLDGO: |               JRST SYSGO      (Reload and start)      |
           |-------------------------------------------------------|
   EVGO:   |               JRST SYSGO1     (Start)                 |
           +-------------------------------------------------------+






















                                    388
                               MONITOR TABLES


                            SYSERR-STORAGE-AREA

   SYSERR STORAGE AREA.  In and out pointers into  the  buffer  area  are
   maintained  for  JOB0  as  well  as  pointers to the free and released
   SYSERR blocks.

   Defined in:  STG, SERCOD

           +-------------------------------------------------------+
   SEBQIN: |                Job 0 queue In-pointer                 |
           |-------------------------------------------------------|
   SEBJFN: |                JFN for SYSERR.LOG File                |
           |-------------------------------------------------------|
   SECHKF: |            Flag to wake Job 0 SYSERR FORK             |
           |-------------------------------------------------------|
   SEIETM: |           Time after which failing to OPEN            |
           |               SYSERR LOG File can try again           |
           |-------------------------------------------------------|
   SERCNT: |              Count of queued SYSERR blocks            |
           |-------------------------------------------------------|
   SPRFLG: |             -1 if SERCNT needs initializing           |
           +-------------------------------------------------------+

   Although the In-pointer is in  this  storage  area  the  corresponding
   Out-pointer  in  SEBQUO  is  in  a fixed place in lower core (that is,
   location 24), so JOB 0 can queue up a BUGHLT block after a crash.  One
   can  examine  the last SYSERR block by adding to the right half of the
   contents of SEBQUO, SEBDAT plus offset into SYSERR block.

|          +-------------------------------------------------------+
|  ALCLST: |       Count of lost section 0 all locations           |
|          |-------------------------------------------------------|
|  BUGLST: |            Count of lost bug entries                  |
|          |-------------------------------------------------------|
|  SYELST  |           Count of lost syserr entries                |
|          +-------------------------------------------------------+

















                                    389
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


   SYSERR BUFFER BLOCKS

                                SYSERR BLOCK FORMAT
             +-------------------------------------------------------+
             |  SEBCDR                                               |
           0 |                  Pointer to Next Block                |
             |-------------------------------------------------------|
             |  SEBFN                                                |
           1 |                Function to Call in Job 0              |
             |-------------------------------------------------------|
             |  |SEBCOD|6     SEBSOF   17|         |24 SEBSIZ        |*
             |  | Code | Offset to Free  |         | Blk Size with   |
             |  |         String Space   |         |  Header         |
             |-------------------------------------------------------|
   SEBHED=3  |   SEHCOD    |                           |   SEHLEN    |*
             | Event Code  |                           |Block Length |
             |-------------------------------------------------------|
             |    SEHTAD                                             |
           4 |                     Date and Time                     |
             |-------------------------------------------------------|
             |    SEHUTM                                             |
           5 |                        Uptime                         |
             |-------------------------------------------------------|
             |    SEHSER                                             |
           6 |                      APRID Word                       | *
             |                (Processor Serial Number)              | 
             |-------------------------------------------------------|
           7 |    SEHCNT                                             |
             |                Crash Spanning Counter                 |
             |-------------------------------------------------------|
   SEBDAT=10 |                                                       |
             |                  Body of Error Block                  |
             \                (Dependent on Event Type               \
             \                      See Below)                       \
             |                                                       |
             |                                                       |
             |                                                       |
             |                                                       |
             +-------------------------------------------------------+













                                    390
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


              0 2 3 4 5 6              17 18    23 24              35
      Word   +-------------------------------------------------------+
             |  |SEBCOD|6    SEBSOF    17|        |      SEBSIZ      |
         2   |  | Code | Offset to Free  |        |   Blk Size with  |
             |  |      |  String Space   |        |      Header      |
             +-------------------------------------------------------+


                  Bits     Pointer     Meaning

                   3-5     SEBCOD      State Code
                                        SBCFRE=0 on Free List
                                        SBCREL=1 Released
                                        SBCACT=2 Active
                   6-17    SEBSOF      Offset to Free String Space
                  24-35    SEBSIZ      Block Size Including Header




































                                    391
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


            0          8                             27          35
     Word  +-------------------------------------------------------+
        2  |   SEHCOD    |                           |   SEHLEN    |
           | Event Code  |                           |Block Length |
           +-------------------------------------------------------+


                  Bits     Pointer     Meaning

                   0-8     SEHCOD      Event Code (that is, Block Type)
                                       SEC%RL=101 System Reload
                                       SEC%BG=102 BUGHLT/BUGCHK/BUGINF
                                       SEC%MB=111 Massbus Device Error
                                       SEC%CS=115 Configuration Status 
                                        Change (MTCON)
                                       SEC%FE=130 Front End Error
                                       SEC%11=131 F.E. Reload Entry
                                              (Gives -11 Reboot Info.)
                                       SEC%HS=133 Halt for KS10
                                       SEC%PT=160 Processor Parity Trap
                                       SEC%PI=161 Processor Parity Intrp.
                                       SEC%P1=162 Parity for Extensible
                                        Controllers
                                       SB%BLK=163 Status Block
                                       SEC%6S=232 DN64 event
                                       SEC%KS=241 KLIPA Statistics Event
                                       SEC%CI=242 CI Disk/Tape Endpacket
                                       SEC%EL=243 MSCP Error Log Event
                                       SEC%KP=244 KLIPA Error Event
                                       SEC%KE=246 KLIPA Error-Log Packet
                  27-35    SEHLEN      Block Length (Including Header)
                                       RL%LEN - System Reload Block Length
                                       BG%LEN - BUGHLT/CHK/INF Block Length
                                       MB%LEN - Massbus Dev. Err Blk Length
                                       CS%SIZ - Change Blk Length
                                       FE%LEN - F.E. Errors Blk Length
                                       R1%LEN - F.E. Reload Entry Blk Length
                                       HS%LEN - KS10 Block Length
                                       PT%LEN - Proc. Parity Trap Blk Length
                                       PI%LEN - Proc. Parity Interrupt Blk Lgh
                                       PI%LN2 - Extensible Controllers Blk Lgh
                                       SB%MAX - Maximum Status Block Length
                                       CI%LEN - CI Endpacket Blk Length
                                       EL%LEN - MSCP Error Log Block Length
                                       KP%LEN - KLIPA Error Block Length
                                       KS%LEN - KLIPA Statistics Block Length
                                       KE%LEN - KLIPA Error Log Block Length
                  Word 6 to End (Body of Error Block - Dependent on Event Type)




                                    392
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)



      Event Type 101
        System Reloaded Error Block Data

             +-----------------------------------------------------+
   RL%SVN=0  |          ASCII Byte Pointer to System Name          |
             |-----------------------------------------------------|
   RL%STD=1  |         Time of System Build (Univ. Format)         |
             |-----------------------------------------------------|
   RL%VER=2  |                System Version Number                |
             |-----------------------------------------------------|
   RL%SER=3  |                  APR Serial Number                  |
             |-----------------------------------------------------|
   RL%OPR=4  |         ASCII Byte Pointer to "Why Reload"          |
             |-----------------------------------------------------|
   RL%HLT=5  |          BUGHLT Address (if Auto-Reloaded)          |
             |-----------------------------------------------------|
   RL%FLG=6  |                        Flags                        |
             |-----------------------------------------------------| / \
   RL%SIZ=7  |                 Monitor Name (Text)                 |  |
             |                                                     | NSVNT=
             |                                                     |  26.
             |                                                     |  |
             |-----------------------------------------------------| \ /
             |                                                     | / \
             |          "Why Reload" Answer String (Text)          |  |
             |                                                     | RLBSZ=
             |                                                     |  16.
             +-----------------------------------------------------+ \ /
   RL%LEN=61






















                                    393
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


      Event type 102
        BUGHLT/CHK/INF  Error Block Data

             +-----------------------------------------------------+
   BG%SVN=0  |                 System Name (ASCIZ)                 |
             |-----------------------------------------------------|
   BG%SER=1  |                  APR Serial Number                  |
             |-----------------------------------------------------|
   BG%VER=2  |                   Monitor Version                   |
             |-----------------------------------------------------|
   BG%SDT=3  |                TAD of Monitor Build                 |
             |-----------------------------------------------------|
             |             Type (1,2 or 3) of BUG Call:            |
   BG%FLG=4  |             (BG%CHK=1;BG%INF=2;BG%HLT=3)            |
             |-----------------------------------------------------|
   BG%ADR=5  |                 Address of HLT/CHK                  |
             |-----------------------------------------------------|
   BG%JOB=6  |          FORKX           |         Job Number       |
             |-----------------------------------------------------|
   BG%USR=7  |                     User Number                     |
             |-----------------------------------------------------|
   BG%PNM=10 |                Program Name (SIXBIT)                |
             |-----------------------------------------------------|
   BG%MSG=11 |                   Message (ASCIZ)                   |
             |-----------------------------------------------------| / \
   BG%ACS=12 |                         ACS                         |  |
             \                                                     \ 16.
             |-----------------------------------------------------| \ /
   BG%PIS=32 |                      PI Status                      |
             |-----------------------------------------------------|
   BG%RCT=33 |                   Register Count                    |
             |-----------------------------------------------------|
   BG%REG=34 |               Registers (Maximum of 4)              |
             |-----------------------------------------------------|
   BG%NAM=40 |                 SIXBIT Name of Check                |
             |-----------------------------------------------------|
   BG%DAT=41 |            Time and Date of BUGHLT/BUGCHK           |
             |-----------------------------------------------------|
   BG%CNT=42 |          Number of BUG Checks Since Startup         |
             |-----------------------------------------------------|
   BG%APS=43 |                APR Flags (CONI APR,)                |
             |-----------------------------------------------------|
   BG%PGS=44 |               Pager Flags (CONI PAG,)               |
             |-----------------------------------------------------|
   BG%PGD=45 |               Pager Data (DATAI PAG,)               |







                                    394
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


             |-----------------------------------------------------|
   BG%ERG=46 |                    Error Register                   |
             |-----------------------------------------------------| / \
   BG%SIZ=47 |                                                     |  |
             |                     String Area                     |  |
             |                                                     | 34.
             |                                                     |  |
             \                                                     \  |
   BG%LEN=111+-----------------------------------------------------+ \ /

      Event Type 111
        MASS BUS DEV Error Data Block

             +-------------------------------------------------------+
   MB%NAM=0  |              Device Name (if available)               |
             |-------------------------------------------------------|
   MB%VID=1  |                  Volume ID (SIXBIT)                   |
             |-------------------------------------------------------|
   MB%TYP=2  |           Channel,,Device Type - See PHYPAR           |
             |-------------------------------------------------------|
   MB%LOC=3  |      Location of Error - Sector or File,,Record       |
             |-------------------------------------------------------|
   MB%FES=4  |         Final Error State - Device Dependant          |
             |-------------------------------------------------------|
   MB%CNI=5  |                     CONI Initial                      |
             |-------------------------------------------------------|
   MB%CIF=6  |                      CONI Final                       |
             |-------------------------------------------------------|
   MB%SEK=7  |                    Number of Seeks                    |
             |-------------------------------------------------------|
   MB%RED=10 |             Number of Blocks/Frames Read              |
             |-------------------------------------------------------|
   MB%WRT=11 |            Number of Blocks/Frames Written            |
             |-------------------------------------------------------|
   MB%FIL=12 |                  Filename (Pointer)                   |
             |-------------------------------------------------------|
   MB%USR=13 |         User Making Request (directory number)        |
             |-------------------------------------------------------|
   MB%PGM=14 |                    Program Running                    |
             |-------------------------------------------------------|
   MB%D1I=15 |                  DATAI PTCR Initial                   |
             |-------------------------------------------------------|
   MB%D1F=16 |                   DATAI PTCR Final                    |
             |-------------------------------------------------------|
   MB%D2I=17 |                   DATAI PBAR Initial                  |
             |-------------------------------------------------------|
   MB%D2F=20 |                   DATAI PBAR Final                    |
             |-------------------------------------------------------|
   MB%UDB=21 |         Unit Data Block for JOB 0 BAT Blocks          |



                                    395
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


             |-------------------------------------------------------|
   MB%IRS=22 |     IORB Status Word, IS.ERR if Hard (See PHYPAR)     |
             |-------------------------------------------------------|
   MB%SRE=23 |                   Soft Read Errors                    |
             |-------------------------------------------------------|
   MB%SWE=24 |                   Soft Write Errors                   |
             |-------------------------------------------------------|
   MB%HRE=25 |                   Hard Read Errors                    |
             |-------------------------------------------------------|
   MB%HWE=26 |                   Hard Write Errors                   |
             |-------------------------------------------------------|
   MB%PS1=27 |          Position, CYL if Disk, File if Tape          |
             |-------------------------------------------------------|
   MB%PS2=30 |                  SURF/SEC or Record                   |
             |-------------------------------------------------------|
   MB%CS0=31 |                   Channel Logout 0                    |
             |-------------------------------------------------------|
   MB%CS1=32 |                   Channel Logout 1                    |
             |-------------------------------------------------------|
   MB%CS2=33 |                   Channel Logout 2                    |
             |-------------------------------------------------------|
   MB%CC1=34 |                       First CCW                       |
             |-------------------------------------------------------|
   MB%CC2=35 |                      Second CCW                       |
             |-------------------------------------------------------|
   MB%MPE=36 |                     Count of MPE                      |
             |-------------------------------------------------------|
   MB%NXM=37 |                     Count of NXM                      |
             |-------------------------------------------------------|
   MB%FEC=40 |                   Final Error Count                   |
             |-------------------------------------------------------|
   MB%CAD=41 |                    Channel Address                    |
             |-------------------------------------------------------|
   MB%UAD=42 |                     Unit Address                      |
             |-------------------------------------------------------|
   MB%SPE=43 |                Soft Positioning Errors                |
             |-------------------------------------------------------|
   MB%HPE=44 |                Hard Positioning Errors                |
             |-------------------------------------------------------|
   MB%OVR=45 |                       Overruns                        |
             |-------------------------------------------------------|
   MB%ICR=46 |                      Initial TCR                      |
             |-------------------------------------------------------|
   MB%REG=47 |       Units Massbus Registers in order with their:    |
             \        Final Contents,, Initial Error Contents        \
             |                                                       |
             +-------------------------------------------------------+
   MB%LEN=124




                                    396
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


   Event Type 115
      Configuration Status Change (logged by MTCON)

             +--------------------------------------------------------+
   CS%OPW=0  |                    Operation Code                      |
             |               Codefield is CS%OPR=77B17                |
             |           Codes are:  CS%ADV=0; Attach Device          |
             |                       CS%DDV=1; Detach Device          |
             |--------------------------------------------------------|
   CS%HTP=1  |                    Hardware Type                       |
             |        Channel Type        |         Unit Type         |
             |--------------------------------------------------------|
   CS%DNM=2  |              Logical Device Name (SIXBIT)              |
             |--------------------------------------------------------|
   CS%APS=3  |            Device Address and Serial Number            |
             |--------------------------------------------------------|
   CS%RSW=4  |                Offset to Reason String                 |
             +--------------------------------------------------------+


      Event Type 130
        Front End Errors Data Block

             +--------------------------------------------------------+
   FE%FJB=0  |                 Fork Number,,Job Number                |
             |--------------------------------------------------------|
   FE%DIR=1  |                    Directory Numbers                   |
             |--------------------------------------------------------|
   FE%ID=2   |                Front End Software Version              |
             |--------------------------------------------------------|
   FE%NAM=3  |                 SIXBIT Name of Program                 |
             |--------------------------------------------------------|
   FE%DEV=4  |            Protocol Device Code (1B0=Unknown)          |
             |--------------------------------------------------------|
   FE%PTR=5  |             -Length of Data,,Start of Data             |
             |--------------------------------------------------------|
   FE%DTE=6  |                       DTE Number                       |
             |--------------------------------------------------------|
   FE%BYT=7  |         Number of -11 Bytes in the Message             |
             +--------------------------------------------------------+
   FE%LEN=10











                                    397
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


      Event Type 131
        Front End Reload    ERROR BLOCK DATA
                           
             +--------------------------------------------------------+
   R1%NUM=0  |                      -11 Number                        |
             |--------------------------------------------------------|
   R1%STS=1  |                  Reload Status Bits                    |
             |--------------------------------------------------------|
   R1%FNM=2  |                   File Name Pointer                    |
             |--------------------------------------------------------|
   R1%ERW=3  |                    -11 Error Word                      |
             |--------------------------------------------------------| / \
             |                                                        |  |
             \                     String Area                        \  20
             |                                                        |  |
             +--------------------------------------------------------+ \ /
   R1%LEN=30


            0 1 2 3 4 5 6 7 8 9 0 1 12                     32 33  35
   Word    +--------------------------------------------------------+
   R1%STS=1| | | | | | | | | | | | |                         |      |
           +--------------------------------------------------------+


                  Symbol   Bits        Contents

                  .R1GTF     0         GTJFN failed for Dump File
                  .R1OPF     1         OPENF failed for Dump File
                  .R1DPF     2         Dump failed
                  .R110E     3         To -10 Error on Dump 
                  .R111E     4         To -11 Error on Dump
                  .R1ASF     5         ASGPAG failed on Dump
                  .R1RLF     6         Reload failed
                  .R1PDF     7         -11 didn't Power Down
                  .R1PUF     8         -11 didn't Power Up
                  .R1RMF     9         ROM did not ACKnowledge the -10
                  .R1BSF    10         -11 Boot Program didn't 
                                        make it to the -11
                  .R1NRL    11         -11 took more than 1 Min. to 
                                        Reload.
                  .R1RTC   33-35       Retry Count










                                    398
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


            0 1 2                  17 18 19 20                   35
   Word    +-------------------------------------------------------+
   R1%ERW=3|   |     Fault Code      |     |    Parity Register    |
           +-------------------------------------------------------+


                  Bits     Contents

                   2-17    Fault code as 3 RAD50 characters
                  20-35    Parity Register Valid Only if it is Nonzero
   Event Type 133
      Halt for KS10

             +--------------------------------------------------------+
   HS%COD=0  |             Halt Status Code (Phy. Loc. 0)             |
             |--------------------------------------------------------|
   HS%PC=1   |              Program Counter (Phy. Loc. 1)             |
             |--------------------------------------------------------|
   HS%PTR=2  |            Halt Status Block Offset Pointer            |
             |--------------------------------------------------------|
   CS%PTR=3  |           Clock Stop Blk Offset Pty. (Unused)          |
             |--------------------------------------------------------| / \
   HS%HDZ=4  |                                                        |  |
             \                   Halt Status Block                    \ HS%HSZ
             |                                                        |  =22
             |                                                        |  |
             +--------------------------------------------------------+ \ /
   HS%LEN=26
























                                    399
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


   Halt Status Block

             +--------------------------------------------------------+
   HS%NUL=0  |                       Magnitude                        |
             |--------------------------------------------------------|
   HS%PC=1   |                           PC                           |
             |--------------------------------------------------------|
   HS%HR=2   |                   Current Instruction                  |
             |--------------------------------------------------------|
   HS%AR=3   |                           AR                           |
             |--------------------------------------------------------|
   HS%ARX=4  |                          ARX                           |
             |--------------------------------------------------------|
   HS%BR=5   |                     Base Register                      |
             |--------------------------------------------------------|
   HS%BRX=6  |                 Base Register Extension                |
             |--------------------------------------------------------|
   HS%ONE=7  |                      Constant One                      |
             |--------------------------------------------------------|
   HS%EBR=10 |                   Exec Base Register                   |
             |--------------------------------------------------------|
   HS%UBR=11 |                   User Base Register                   |
             |--------------------------------------------------------|
   HS%MSK=12 |                         Mask                           |
             |--------------------------------------------------------|
   HS%FLG=13 |                 Microcode Status Flags                 |
             |--------------------------------------------------------|
   HS%PI=14  |                       PI Status                        |
             |--------------------------------------------------------|
   HS%X1=15  |             1              |             1             |
             |--------------------------------------------------------|
   HS%T0=16  |                           T0                           |
             |--------------------------------------------------------|
   HS%T1=17  |                           T1                           |
             |--------------------------------------------------------|
   HS%VMA=20 |           VMA Flags                    VMA             |
             |--------------------------------------------------------|
   HS%FE=21  |             FE             |             SC            |
             +--------------------------------------------------------+













                                    400
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


      Event Type 160
        Processor Parity Trap Error Block Data

             +--------------------------------------------------------+
   PT%PFW=0  |                     Page Fail Word                     |
             |--------------------------------------------------------|
   PT%BDW=1  |                     Bad Data Word                      |
             |--------------------------------------------------------|
   PT%GDW=2  |                     Good Data Word                     |
             |--------------------------------------------------------|
   PT%USR=3  |                      User Number                       |
             |--------------------------------------------------------|
   PT%JOB=4  |           FORKX           |            JOBN            |
             |--------------------------------------------------------|
   PT%PGM=5  |                  Program Name (SIXBIT)                 |
             |--------------------------------------------------------|
   PT%PMA=6  |                Physical Memory Address                 |
             |--------------------------------------------------------|
   PT%TRY=7  |            Flags          |        Retry Count         |
             |--------------------------------------------------------|
   PT%EPA=10 |                EPT Offset Physical Address             |
             |--------------------------------------------------------|
   PT%EPD=11 |                      EPT Offset Data                   |
             |--------------------------------------------------------|
   PT%UPA=12 |                UPT Offset Physical Address             |
             |--------------------------------------------------------|
   PT%UPD=13 |                      UPT Offset Data                   |
             +--------------------------------------------------------+
   PT%LEN=14

              0 1 2 3 4                17 18                       35
   Word      +-------------------------------------------------------+
   PT%TRY=7  | | | | | |                 |        Retry Count        |
             +-------------------------------------------------------+


                  Symbol   Bits        Contents

                  PT%HRO     1         Hard Error
                  PT%CCP     2         Cache Failure
                  PT%CCH     3         Cache in Use
                  PT%ESW     4         Error on Sweep to Core
                           18-35       Retry Count









                                    401
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


      Event Type 161
        Processor Parity Interrupt Error Data Block

             +-------------------------------------------------------+
   PI%CNI=0  |                       CONI APR                        |
             |-------------------------------------------------------|
   PI%ERA=1  |                          ERA                          |
             |-------------------------------------------------------|
   PI%FPC=2  |                          PC                           |
             |-------------------------------------------------------|
   PI%SWP=3  |              Number of Errors This Sweep              |
             |-------------------------------------------------------|
   PI%AAD=4  |            Logical "AND" of Bad Addresses             |
             |-------------------------------------------------------|
   PI%OAD=5  |             Logical "OR" of Bad Addresses             |
             |-------------------------------------------------------|
   PI%ADA=6  |               Logical "AND" of Bad Data               |
             |-------------------------------------------------------|
   PI%ODA=7  |               Logical "OR" of Bad Data                |
             |-------------------------------------------------------| / \
   PI%SBD=10 |               SBUS DIAG Function Data                 |  |
             \                                                       \ 10.
             |-------------------------------------------------------| \ /
   PI%ADD=22 |                First 10. Bad Addresses                | / \
             \                                                       \ 10.
             |-------------------------------------------------------| \ /
   PI%DAT=34 |               First 10. Bad Data Words                | / \
             \                                                       \ 10.
             |-------------------------------------------------------| \ /
   PI%CDA=46 |          Core Ref of First 10. Bad Addresses          | / \
             \                                                       \ 10.
             |-------------------------------------------------------| \ /
   PI%FFL=60 |                         Flags                         |
             +-------------------------------------------------------+
   PI%LEN=61

















                                    402
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


      Event Type 162
        Parity Format for Extensible Controllers

             +-------------------------------------------------------+
   PI%CN2=0  |                       CONI APR                        |
             +-------------------------------------------------------+
   PI%ER2=1  |                          ERA                          |
             +-------------------------------------------------------+
   PI%FL2=2  |                         flags                         |
             +-------------------------------------------------------+
   PI%PC2=3  |                          PC                           |
             +-------------------------------------------------------+
   PI%ERC=4  |                      Error count                      |
             +-------------------------------------------------------+
   PI%AA2=5  |            logical "AND" of bad addresses             |
             +-------------------------------------------------------+
   PI%OR2=6  |             logical "OR" of bad addresses             |
             +-------------------------------------------------------+
   PI%AD2=7  |               Logical "AND" of bad data               |
             +-------------------------------------------------------+
   PI%OD2=10 |               Logical "OR" of bad data                |
             +-------------------------------------------------------+
   PI%SB2=11 |   -Count of controllers   |       first offset        |
             +-------------------------------------------------------+
   PI%BAD=12 |                                                       | /\
             \                First ten bad addresses                \ 10.
             |                                                       | \/
             +-------------------------------------------------------+
   PI%DA2=24 |                                                       | /\
             \                  First ten bad words                  \ 10.
             |                                                       | \/
             +-------------------------------------------------------+
   PI%MDA=36 |                                                       | /\
             \          Memory references of first ten words         \ 10.
             |                                                       | \/
             +-------------------------------------------------------+
   PI%SBA=50 |                                                       | /\
             \                      SBDIAG data                      \ PI%MXS
             |                                                       | =100
             |                                                       | \/
             +-------------------------------------------------------+











                                    403
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


      Event Type 163
        Status Block Entry

             +-------------------------------------------------------+
   SB%API=0  |                         APRID                         |
             +-------------------------------------------------------+
   SB%APR=1  |                       CONI APR                        |
             +-------------------------------------------------------+
   SB%PIC=2  |                        CONI PI                        |
             +-------------------------------------------------------+
   SB%PGD=3  |                       DATAI PAG                       |
             +-------------------------------------------------------+
   SB%PGC=4  |                       CONI PAG                        |
             +-------------------------------------------------------+ / \
   SB%UP0=5  |                                                       |  4
             \                 UPT locations 424-427                 \  |
             +-------------------------------------------------------+ \ /
   SB%ERA=11 |                         RDERA                         |
             +-------------------------------------------------------+
   SB%RHC=12 |                                                       | /\
             |            CONI RH20 -- for all 8 possible            | SB%RHL
             \                                                       \   =8
             +-------------------------------------------------------+ \/
   SB%DTC=22 |                                                       | /\
             |            CONI DTEN -- for all 4 possible            | SB%DTL
             \                                                       \   =4
             +-------------------------------------------------------+ \/
   SB%EP0=26 |                                                       | / \
             |                  EPT locations 0-37                   |  40
             \                                                       \  |
             +-------------------------------------------------------+ \ /
   SB%EP1=66 |                                                       | / \
             |                 EPT locations 140-177                 |  40
             \                                                       \  |
             +-------------------------------------------------------+ \ /
   SB%UP1=126|                                                       | /\
             |                 UPT locations 500-503                 |  4
             \                                                       \ \/
             +-------------------------------------------------------+
   SB%6=132  |                                                       | /\
             |              AC block 6 REGS 0-3 and 12               |  5
             \                                                       \ \/
             +-------------------------------------------------------+
   SB%7=137  |                                                       | /\
             |                  AC block 7 REGS 0-2                  |  3
             \                                                       \ \/
             +-------------------------------------------------------+
   SB%SBD=142|                                                       | / \
             |                      SBDIAG data                      | SB%SBL
             \                                                       \  =50
             +-------------------------------------------------------+ \ /
   SB%MAX=213
                                    404
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


      Event Type 241
        KLIPA Statistics Entry
             +-------------------------------------------------------+
   KS%OFF=0  |                  Offset to Counters                   |
             |-------------------------------------------------------|
   KS%VER=1  |                Microcode Version Word                 |*
             |-------------------------------------------------------|
   KS%AAK=2  |                      Path A Acks                      |
             |-------------------------------------------------------|
   KS%ANK=3  |                     Path A Nacks                      |
             |-------------------------------------------------------|
   KS%ANR=4  |                  Path A No-Responses                  |
             |-------------------------------------------------------|
   KS%BAK=5  |                      Path B Acks                      |
             |-------------------------------------------------------|
   KS%BNK=6  |                     Path B Nacks                      |
             |-------------------------------------------------------|
   KS%BNR=7  |                  Path B No-Responses                  |
             |-------------------------------------------------------|
   KS%DGD=10 |                  Datagrams Discarded                  |
             |-------------------------------------------------------|
   KS%PXM=11 |                  Packets Transmitted                  |
             |-------------------------------------------------------|
   KS%PRC=12 |                   Packets Received                    |
             |-------------------------------------------------------|
   KS%DPT=13 |                 Designated Port Word                  |
             |                                     |28 KS%PRT        |
             |                                     | Designated Port |
             |-------------------------------------------------------|
   KS%CRC=14 |           Packets Received With Crc Errors            |
             |-------------------------------------------------------|
   KS%EW1=15 | KS%MPE                   | KS%CPE                     |
             |   Mover PAR Pre Errors   |    CBUS Parity Errors      |
             |-------------------------------------------------------|
   KS%EW2=16 | KS%RPE                   | KS%DPE                     |
             |   Register PLIPE Errors  |    Data PLIPE Errors       |
             |-------------------------------------------------------|
   KS%EW3=17 | KS%CHE                   | KS%EPE                     |
             |     Channels Errors      |    EBUS Parity Errors      |
             |-------------------------------------------------------|
   KS%EW4=20 | KS%SCE                   | KS%CAT                     |
             | Spurious Channel Errors  |  CBUS Available Timeouts   |
             |-------------------------------------------------------|
   KS%EW5=21 | KS%SRA                   | KS%STA                     |
             | Spurious Receive Atten.  | Spurious Transmit Atten.   |
             |-------------------------------------------------------|
   KS%EW6=22 | KS%TBP                   | KS%TTM                     |
             | Xmit Buffer Parity Errors|   Transmitter Timeouts     |
             +-------------------------------------------------------+
   KS%LEN=23


                                    405
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


              0          11     14 15  17 18
   Word      +-------------------------------------------------------+
   KS%VER=1  | |        |         |      |                           |
             |-------------------------------------------------------|


        Symbol    Bits     Contents

        KS%NI       0      O=CI, 1=NI
        KS%RSN    11-14    Reason for Doing Read-Counters
                                  0,  Illegal
                           KS%CPE=1,  CRAM Parity Error
                           KS%AGB=2,  Wire A Went From Good to Bad
                           KS%ABG=3,  Wire A Went From Bad to Good
                           KS%BGB=4,  Wire B Went From Good to Bad
                           KS%BBG=5,  Wire B Went From Bad to Good
                           KS%PER=6,  Periodic Reading of Counters
                           KS%GUC=7,  Get Microcode Version
                           KS%DIA=10, DIAG% Did It
        KS%CHN    15-17    KLIPA Channel Number
        KS%VSN    18-35    Microcode Version


      Event Type 242    
        CI Disk/Tape Endpacket

             +-------------------------------------------------------+
   CI%NOD=0  |        Port Number       |         Node Number        |
             |-------------------------------------------------------|    
   CI%VID=1  |                       Volume ID                       |
             |-------------------------------------------------------|    
   CI%RED=2  |                  Blocks/Frames Read                   |
             |-------------------------------------------------------|    
   CI%WRT=3  |                 Blocks/Frames Written                 |
             |-------------------------------------------------------|    
   CI%PS1=4  |                      Position 1                       |
             |-------------------------------------------------------|    
   CI%PS2=5  |                      Position 2                       |
             |-------------------------------------------------------|    
   CI%UDB=6  |             Required For Bat Block Logic              |
             |-------------------------------------------------------|    
   CI%LOC=7  |            Linear Address From Error Block            |
             |-------------------------------------------------------| / \
   CI%PAK=10 |                                                       |  |
             |               Packet With Error Bit On                |  9.
             |                                                       |  |
             |-------------------------------------------------------| \ /
   CI%LEN=21




                                    406
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


      Event Type 243
        MSCP Error Log

             +-------------------------------------------------------+ 
   EL%NOD=0  |           Port             |           Node           |
             |-------------------------------------------------------| / \
   EL%PAK=1  |                                                       |  |
             |                       Data Packet                     | 96.
             |                                                       |  |
             +-------------------------------------------------------+ \ /
   EL%LEN=141


      Event Type 244
        KLIPA Error Event

             +-------------------------------------------------------+
   KP%CSR=0  |                       CONI Status                     |
             |-------------------------------------------------------|    
   KP%VER=1  |                    Microcode Version                  |*
             |-------------------------------------------------------|    
   KP%DSP=2  |                    Error Disposition                  |
             |-------------------------------------------------------|    
   KP%CRA=3  |                      CRAM Address                     |
             |-------------------------------------------------------|    
   KP%CRD=4  |                   CRAM Data (2 Words)                 |
             |-------------------------------------------------------|    
   KP%LG0=6  |                      Logout Word 0                    |
             |-------------------------------------------------------|    
   KP%LG1=7  |                      Logout Word 1                    |
             |-------------------------------------------------------|    
   KP%LG2=10 |                      Logout Word 2                    |
             |-------------------------------------------------------|    
   KP%ECW=11 |                    Port's Error Word                  |
             |-------------------------------------------------------|    
   KP%PE0=12 |                Port's Error Logout Word 0             |
             |-------------------------------------------------------|    
   KP%PE1=13 |                Port's Error Logout Word 1             |
             |-------------------------------------------------------|    
   KP%LEN=14












                                    407
                               MONITOR TABLES
                        SYSERR-STORAGE-AREA (Cont.)


              0                    15    17
   Word      +-------------------------------------------------------+
   KP%VER=1  | |                  |        |                         |
             +-------------------------------------------------------+    


                  Symbol   Bits        Contents

                  KP%NI      0         Set if this is a KLNI
                  KP%CHN   15-17       Port's RH20 Channel
                                       202

       Event Type 246
         KLIPA Error-Log Packet

             +-------------------------------------------------------+    
   KE%SRC=0  |                        Source Word                    |*
             +-------------------------------------------------------+
   KE%LEN=1

                                    15  17 18                      35
   Word      +-------------------------------------------------------+
   KE%SRC=0  |                      |      |                         |
             +-------------------------------------------------------+


                  Symbol   Bits        Contents

                  KE%CHN   15-17       KLIPA Channel Number
                  KE%NOD   18-35       HSC50 Node Number






















                                    408
                               MONITOR TABLES


                               SYSTEM BLOCK

   There is a system block for each node  on  the  CI  that  TOPS-20  has
   detected.   System block addresses are found in the table SBLIST.  The
   system block is the device-dependent portion of the  KDB  representing
   the CI node.
|  
|  Defined in:  SCAPAR

           +-------------------------------------------------------+
           |                                                       |
           |                                                       |
           |           Device-independent portion of KDB           |
           |                                                       |
           |                                                       |
           |                                                       |
           +-------------------------------------------------------+
   .SBANB  |               Address of next system block            |
           |-------------------------------------------------------|    
   .SBAPB  |       Address of associated port control block        |
           |-------------------------------------------------------|    
   .SBACD  |       Address of associated channel data block        |
           |-------------------------------------------------------|    
|          |                            | SBVCST                   |
|  .SBVCS  |     Closing/opening bits   |    Dest vir cir state *  |
|          |-------------------------------------------------------|    
                                  
|           Symbol  Bit  Contents        Symbol  Value  Meaning
    
|           SBNTC    0   Need to close   VC.CLO    0    Closed
|                        VC
|           SBOKO    1   OK to open VC   VC.STS    1    Start sent
|           SBWFI    2   Waiting for     VC.STR    2    Start received
|                        new IDREC
|                                        VC.OPN    3    Open
                             

















                                    409
                               MONITOR TABLES
|                           SYSTEM BLOCK (Cont.)


|          |-------------------------------------------------------|
|          | SBCHN                      | SBDPA                    |
|  .SBDSP  |       Channel number       |     Destination port     |
|          |-------------------------------------------------------|    
|          | SBDRQH                                                |
|  .SBDRQ  |              Datagram return queue header             |
|          |-------------------------------------------------------|    
|          | SBLMBH                                                |
|  .SBLMB  |               Local message buffer header             |
|          |-------------------------------------------------------|    
   .SBFCB  |            Pointer to first connection block          |
           |-------------------------------------------------------|    
   .SBLCB  |            Pointer to last connection block           |
           |-------------------------------------------------------|    
   .SBTWQ  |                FLINK for SCA work queue               |
           |-------------------------------------------------------|    
   .SQBWQ  |                BLINK for SCA work queue               |
           |-------------------------------------------------------|    
   .SBCLC  |              Count of locked connections              |
           |-------------------------------------------------------|    
   .SBQOR  |       Pointer to queue of outstanding requests        |
           |-------------------------------------------------------|
   .SBDSS  \                                                       \
           \                   Destination system                  \
           |-------------------------------------------------------|    
|          | SBMXMG                     | SBMXDG                   |
|  .SBMMS  |   Max mess size (bytes)    |    Max DG size (Bytes)   |
|          |-------------------------------------------------------|    
|          | SBDTSW                                                |
|  .SBDST  |               Destination software type               |
|          |-------------------------------------------------------|    
|          | SBDVSW                                                |
|  .SBDSV  |             Destination software version              |
|          |-------------------------------------------------------|    
|  .SBDSE  |           Destination software edit level             |
|          |-------------------------------------------------------|    
|          | SBDTHW                                                |
|  .SBDHT  |               Destination hardware type               |
|          |-------------------------------------------------------|    
|          \ SBDVHW                                                \
   .SBDHV  \             Destination hardware version              \
           \                                                       \
           \                                                       \
           |-------------------------------------------------------|    
   .SBNNM  \                Destination port name                  \
           \                                                       \
           |-------------------------------------------------------|    
   .SBDPC  |            Destination port characteristics           |
           |-------------------------------------------------------|    
   .SBDCR  |          Destination Port Code Revision Level         |


                                    410
                               MONITOR TABLES
|                           SYSTEM BLOCK (Cont.)


           |-------------------------------------------------------|    
   .SBDPF  |             Destination Port Functionality            |
           |-------------------------------------------------------|    
   .SBDPS  |                Destination Port State                 |
           |-------------------------------------------------------|    
   .SBTIM  |       TODCLK at last message from this remote         |
           |-------------------------------------------------------|    
|  .SBFLG  | | |  |               Flags                            |*
|          |-------------------------------------------------------|
|  
|           Symbol   Bit   Contents
                                     
|           SBFTMG    0    Timed message
|           SBFOVC    1    VC needs open
|           SBFOFL    3    Node offline
|  
|          |-------------------------------------------------------|    
|          | SBSST                                                 |
|  .SBSST  |                Start Sequence Timer                   |
|          |-------------------------------------------------------|    
|          | SBOBB                                                 |
|  .SBOBB  |            Out bound buffer for system block          |
|          +-------------------------------------------------------+





























                                    411
                               MONITOR TABLES


                                    TR

   DECnet Router test message data block.

   Defined in:  D36PAR
                                            Format                                  

          +------------------------------------------------------------------------+ 
   TRTND  |                            Node to test with                           |        
          |------------------------------------------------------------------------| 
   TRTSN  |                        Serial number of message                        |        
          |------------------------------------------------------------------------| 
   TRTAF  |                    Time when message reaches RTRFWD                    |        
          |------------------------------------------------------------------------| 
   TRTIC  |                         Time at input complete                         |        
          |------------------------------------------------------------------------| 
   TRTOC  |                  Time when output complete is received                 |        
          |------------------------------------------------------------------------| 
   TRTTD  |                            Time given to DLL                           |        
          |------------------------------------------------------------------------| 
   TRTTA  |                   Total time to turn around (TIC-TAF)                  |        
          |------------------------------------------------------------------------| 
   TRTED  |                  Time to get from FWD to DLL (TTD-TAF)                 |        
          |------------------------------------------------------------------------| 
   TRTFD  |               Time from forward to output done (TTF-TOC)               |        
          +------------------------------------------------------------------------+ 



























                                    412
                               MONITOR TABLES


                           TT-LINE-DYN-DATA-BLK

   Teletype Line Dynamic Data Block.  This block pointed to by the line's
   entry  in  TTACTL, holds line specific data and is built when the line
   becomes active.  It is deallocated when the line becomes inactive.

   There are two shortened forms of the dynamic data block, one used  for
   a  SENDALL type of message and the other for sending a "ding" when any
   character but CTRL/C is typed on an inactive line.

|  Defined in:  TTYDEF

                                   Format

             +-------------------------------------------------------+
   TTFLG1=0  |                        Flags                          |*
             |-------------------------------------------------------|
   TTDAT1=1  |                            |  TINTL                   |*
             |  Buffer Info & Term. Type  |    Internal Line Number  |
             |-------------------------------------------------------|
   TTSAL1=2  |  TLTYP         |  TSALT         |    TSALC            |
             | Line Type      | Send All       |   Send All          |*
             |                | Timeout Count  |   Character Count   |
             |-------------------------------------------------------|
   TTSAL2=3  |                                                       |
             |              Send All Byte Pointer                    |
             |-------------------------------------------------------|
   TTDEV=4   |             Device dependent word                     |
             |          (See Device modules for definitions)         |
             |-------------------------------------------------------|
   TTBFRC=5  |0       7|8    11|12   15|16        25|26            35|
             |  TOWRN  | TTNIN | TTNOU |   TIMAX    |  TOMAX         |
             | Wake Up |# of   |# of   |  Max bytes | Max bytes      |
             |  Count  | Input |Output |In Input Buf| In Output Buf  |
             |         | Bufs  | Bufs  |            |                |
             |-------------------------------------------------------|
   TTOCT=6   |          Number of Characters in Output Buffer        |
             |-------------------------------------------------------|
   TTOOUT=7  |     Pointer for Removing Char from Output Buffer      |
             |-------------------------------------------------------|
   TTOIN=10  |     Pointer for Entering Char into Output Buffer      |
             |-------------------------------------------------------|
   TTDAT2=11 |              Input Info. & Page Width                 |*
             |-------------------------------------------------------|
   TTICT=12  |           Number Characters in Input Buffer           |
             |-------------------------------------------------------|
   TTIOUT=13 |      Pointer for Removing Char from Input Buffer      |
             |-------------------------------------------------------|
   TTIIN=14  |      Pointer for Entering Char into Input Buffer      |




                                    413
                               MONITOR TABLES
                        TT-LINE-DYN-DATA-BLK (Cont.)


             |-------------------------------------------------------|
   FCMOD1=15 |        Control Character Output Control Words         |
             |---------                                     ---------|
   FCMOD2=16 |     Possible Values for each Char. (2 Bits/Char)      |
             |         CCNONE = 0  Send nothing                      |
             |         CCIND  = 1  Indicate via ^                    |
             |         CCSEND = 2  Send Actual Code                  |
             |         CCSIM  = 3  Simulate Format Action            |
             |-------------------------------------------------------|
   TTDPSI=17 |    Bit for Terminal Code Set if Deferred Interrupt    |
             |-------------------------------------------------------|
   TTPSI=20  |        Bit for Terminal Code Set if Interrupt         |
             |-------------------------------------------------------|
   TTLINK=21 |           Lines linked to (9 bits per line)           |
             |-------------------------------------------------------|
   TTLPOS=22 | TPGPS                     | TLNPS                     |
             |  Cur Line Position in Page| Current Charcter Position |
             |                           |        within Line        |
             |-------------------------------------------------------|
|  TTFLGS=23 |0     |   |10            17|                   |32   35|
|            |TOFLG |   |TPLEN           |                   | TTDUM |
|            |^O was|   | page length    |                   |duplex |
|            | typed|   |                |                   | mode  |
             |-------------------------------------------------------|
   TTFORK=24 | TCJOB                     | TWFRK                     |
             | Controlling Job Number    | Fork Number in Input Wait |
             |                           |        on this Line       |
             |-------------------------------------------------------|
   TTFRK1=25 | TTPSFK                    | TTPFK                     |
             |  PSI Fork # for           | Fork which is Top Fork of |
             |  Non-controlling TTY      |  a SCTTY Tree (-1 if None)|
             |-------------------------------------------------------|
   TTCHR1=26 |       Wake Up Character Mask (ASCII Codes 0-31.)      |
             |-------------------------------------------------------|
   TTCHR2=27 |      Wake Up Character Mask (ASCII Codes 32.-63.)     |
             |-------------------------------------------------------|
   TTCHR3=30 |      Wake Up Character Mask (ASCII Codes 64.-95.)     |
             |-------------------------------------------------------|
   TTCHR4=31 |      Wake Up Character Mask (ASCII Codes 96.-127.)    |













                                    414
                               MONITOR TABLES
                        TT-LINE-DYN-DATA-BLK (Cont.)


             |-------------------------------------------------------|
   TTFWTH=32 |                           | TTFCNT                    |*
             |       PSI Level Info      |   Byte Count              |
             |-------------------------------------------------------|
   TTLINE=33 |                      Line Counter                     |
             |-------------------------------------------------------|
   TTLMAX=34 |                   Maximum of TTLINE                   |
             |-------------------------------------------------------|
   TTFLG2=35 |0          | 1 |2     4|5   11|12   18|                |
             |TTFLA      |   |TTETP  |TTCH1 |TTCH2  |                |
             |First char |   |Type   |First |Second |                |
             |seen flag  |   |       |char  |char   |                |
             |-------------------------------------------------------|    
   TTSVPD=36 |                   Saved Line Speed                    |
             +-------------------------------------------------------+
   TTDDLN=37


            0 1 2 3 4 5 6 7 8 9 10 11                 30         35 
           +-------------------------------------------------------+
   TTFLG1  | | | | | | | | | | |  |  |               |    TTLCK    |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Contents

        TT%SAL      0      TTSAL       Sendall being done to
                                        this line
        TT%SHT      1      TTSHT       This is a short block
        TT%MES      2      TTMES       This is a system 
                                        message block
        TT%OTP      3      TTOTP       Output is enroute to 
                                        the line
        TT%FWK      4      TTFWK       Forced wakeup
        TT%SFG      5      TTSFG       CTRL/S was typed
        TT%RFG      6      TTRFG       Repeat last character
                                        (BKJFN)
        TT%WFG      7      TTWFG       Blocked on input
        TT%PRM      8      TTPRM       Don't deallocate 
                                        dynamic data
        TT%BAC      9      TTBAC       Permanent and becoming
                                        active
        TT%NXO     10      TTNXO       Is 0, no page output stop
        TT%BKO     11      TTBKO       Fork blocked for output
                                        event
        TT%NUS     12      TTNUS       Net user state
        TT%DD1     13      TTDD1       Device dependent bit
        TT%NPM     14      TTNPM       MCB NVT old page mode
        TT%RXF     15      TTRXF       Received XDN on line
        TT%FLO     16      TTFLO       Flushing output at TTSND


                                    415
                               MONITOR TABLES
                        TT-LINE-DYN-DATA-BLK (Cont.)


        TT%HPO     17      TTHPO       High priority output
                                        queued
        TT%DAL     18      TTDAL       Deallocate of block
                                        requested
|       TT%XFF     19      TTXFF       Force XOFF/XON status
|                                       to front-end
|       TT%SEC     20      TTSEC       Server should echo
|       TT%WKC     21      TTWKC       Wake-up set has changed
|       TT%SPG     22      TTSPG       Page stop is turned on
|                                       in the server
|       TT%BIN     23      TTBIN       Current data mode is
|                                       binary (0=ASCII)
|       TT%NUL     24      TTNUL       ASCII mode nul pass
|                                       through
        TT%LCK    30-35    TTLCK       Count of locks on this 
                                        block


            0   4 5   7 8 9            17 18                     35
           +-------------------------------------------------------+
   TTDAT1  |     |     | |               |          TTINTL         |
           +-------------------------------------------------------+


                  Bit      Pointer     Contents

                   4-5     TYLMD       Terminal data mode for last
                                        input character
                   5-7     TTOCN       Count of extra buffers
                    8      TTOMX       Extra buffers in use
                   9-17    TTTYP       Terminal type
                  18-35    TINTL       Internal line number
                                        (index into static data)

             0                17            23             35
   TTSAL1   +------------------------------------------------+
            |      TLTYP       |    TSALT    |     TSALC     |
            +------------------------------------------------+


                  Bit      Pointer     Contents

                   0-17    TLTYP       Line type
                  18-23    TSALT       Sendall timeout count
                  24-35    TSALC       Sendall character count







                                    416
                               MONITOR TABLES
                        TT-LINE-DYN-DATA-BLK (Cont.)



            0      6 7 8 9           17 18           26 27       35
           +-------------------------------------------------------+
   TTDAT2  |        | | | TYLCH        | TPWID         |           |
           +-------------------------------------------------------+


                  Bit      Pointer     Contents

                   0-8     TTUPC       Unpause on page character
                   9-17    TYLCH       Last char removed from input
                                        buffer
                  18-26    TPWID       Page width
                  27-35    TTPPC       Pause/unpause on page character


            0      5 6        11 12       17 18                  35
           +-------------------------------------------------------+
   TTFWTH  |        | TTIPSI    |   TTOPSI  |       TTFCNT         |
           +-------------------------------------------------------+


                  Bit      Pointer     Contents

                   6-11    TTIPSI      Input PSI level
                  12-17    TTOPSI      Output PSI level
                  18-35    TTFCNT      Byte count for wakeup
                                       (0=> disabled for wakeup)
























                                    417
                               MONITOR TABLES


                                  TTACTL

   Teletype Active Line Table.  This resident table contains a pointer to
   each active line's dynamic data block.

   Defined in:  STG

   Index:  Line Number

                                   Format

           +-------------------------------------------------------+
   TTACTL: |       Address of dynamic data block if active         | / \
           |               or -1 if becoming active                |  |
           |                   or 0 if inactive                    |  |
           |-------------------------------------------------------|  |
           |                           .                           |   
           |                           .                           | NLINES
           |                           .                           |   
           |                           .                           |  |
           |                           .                           |  |
           |                           .                           |  |
           \                                                       \ \ /
           +-------------------------------------------------------+

                                    NOTE

           Bit 0 can be on if the  entry  is  an  address.   This
           indicates the address is to a short message block.
























                                    418
                               MONITOR TABLES


                                  TTBUFS

   Teletype Buffers.  This storage area contains  the  input  and  output
   buffers  for  each line (TTY and PTY) on the system.  Input and output
   pointers to each buffer are kept in the  line's  dynamic  data  block.
   These buffers are fixed length and are assigned on demand.  When there
   is no character activity, the buffers are deassigned.

   Defined in:  STG

                                   Format

           +-----------------------------------------------------+
   TTBUFS: |                Pointer to Next Buffer               |
           |-----------------------------------------------------|
           |                                                     |  / \
           |                                                     |   |
           |                                                     |
           |                                                     |Buffer
           |                                                     |   
           |                                                     |  \ /
           |-----------------------------------------------------|
           |                          .                          |
           \                          .                          \
           |-----------------------------------------------------|
           |                 Pointer to Next Buffer              |
           |-----------------------------------------------------|
           |                                                     |  / \
           |                                                     |   |
           |                                                     |
           |                                                     |Buffer
           |                                                     |   
           |                                                     |  \ /
           |-----------------------------------------------------|
           |                          .                          |
           \                          .                          \
           +-----------------------------------------------------+

                                    NOTE

           The free buffers are linked  and  are  pointed  to  by
           TTFREB.











                                    419
                               MONITOR TABLES


                                  TTCSAD

   Terminal Call Special Request Address Table.  This resident  table  is
   used to dispatch to a scheduler routine for a special line request.

   Special line requests are made when the  DTEQ  routine  is  unable  to
   obtain  space  for  a  packet  and cannot block to wait for the space.
   (i.e.  process is NOSKED, or request made at  interrupt  or  scheduler
   level).   A  special  line  request  is  made so that a packet will be
   queued later by SCHED.  (See Table, TTCSTM).

   Defined in:  STG

   Index:  Line Number

                                   Format

            0     6
           +-------------------------------------------------------+
   TTCSAD: |      |                                                |* / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NLINES
           |                           .                           |
           |                                                       |   |
           |                                                       |   |
           \                                                       \  \ /
           +-------------------------------------------------------+


                  Bit      Routine     Meaning

                   0       TTTOBL      Turn on line
                   1       TTSMIO      TTMSG action
                   2       TTCOF       Carrier off check
|                  3       TTCON1      Carrier on action
                   4       DZHV2       Hang up DZ line
                   5       NTYCOF      Carrier off action
                   6       CKSALL      Unhang stuck TTMSG line
                   7       CKNOIS      Noisy line check
                  8-35                 Reserved for future use










                                    420
                               MONITOR TABLES


                                  TTCSTM

   Terminal  Call  Special  Request  Time  Table.   This  resident  table
   parallels the TTCSAD table and holds the time the Scheduler is to call
   the special request routine in TTCSAD.

   Defined in:  STG

   Index:  Line Number

                                   Format

           +-------------------------------------------------------+
   TTCSTM: |     Time for scheduler to call routine in TTCSAD      |  / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NLINES
           |                           .                           |
           |                                                       |   |
           |                                                       |   |
           |                                                       |   |
           \                                                       \  \ /
           +-------------------------------------------------------+




























                                    421
                               MONITOR TABLES


                                  TTSPWD

   Terminal Speed Word Table.  This resident table contains the  terminal
   speeds for each terminal.

   Defined in:  STG

   Index:  Line number

                                   Format

           +-------------------------------------------------------+
   TTSPWD: |   TTISP Input Speed       |    TTOSP Output Speed     |  / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NLINES
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+































                                    422
                               MONITOR TABLES


                                  TTSTAT

   Teletype Status Table.  This  resident  table  contains  the  terminal
   characteristic flags.

   Defined in:  STG

   Index:  Line Number

                                   Format

           +-------------------------------------------------------+
   TTSTAT: |           Terminal Characteristics Flags              |* / \
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |
           |                           .                           | NLINES
           |                           .                           |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+


            0 1 2 3 4 5 6 7 8 10  13 15  17 8 9 20     27 28     35
           +-------------------------------------------------------+
           | | | | | | | | | |      |      |   |  TSFMC  |  TTFBB  |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Contents

        TT%FEM      0      TTFEM       Line is remote
        TT%NTS      1      TTNTS       Don't send system mesg.
        TT%FXO      2      TTFXO       Line needs XON
        TT%CON      3      TTCON       Carrier is on
        TT%FSP      4      TTFSP       Line needs speed set
        TT%FXF      5      TTFXF       Line needs XOF
        TT%IGI      6      TTIGI       Ignore input when line
                                        is inactive
        TT%AUT      7      TTAUT       Line is auto-speed
        TT%XOC      8      TTXOC       Line needs XON/XOFF
                                        character (KS)
        TT%FPK      8      TTFPK       Waiting for FE post (KL)
        TT%SHU      9      TTSHU       Line is shut off
        TT%WSO     10      TTWSO       Line was shut off
        TT%NTM     11      TTNTM       Line does not want
                                        miscellaneous terminal
                                        messages




                                    423
                               MONITOR TABLES
                               TTSTAT (Cont.)


        TT%NUM     12      TTNUM       Line does not want
                                        nonprivileged TTMSG's
                  14-17    TTYSTY      Line type which yields the
                                        offset into the TTLINV table
                  18-19    TTNOI       Count of noise characters
                                        on inactive line
                  20-27    TSFMC       Max count for front-end buffer
                  28-35    TTFBB       Entry count in Big Buf












































                                    424
                               MONITOR TABLES


                             TTY-STORAGE-AREA

   Teletype Storage Area.  This resident area contains hung  and  special
   line  information,  the  Big  Buffer,  and  information  about the Big
   Buffer.  (See TT-LINE-DYN-DATA-BLK, TTACTL,  TTBUFS,  TTCSAD,  TTCSTM,
   TTLINV, TTSPWD, TTSTAT, and TTXXVT Tables).

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+
   CTYINT: |      Unit No. on the .FEDLS Device by which the       |
           |                Front End Knows the CTY                |
           |-------------------------------------------------------|
   TCOERR: |     TCOUT Sets this if Fails in Scheduler Context     |
           |-------------------------------------------------------|
   JORLDF: |        Interlock FE Reload Because CTY Hung           |
           |-------------------------------------------------------|
   SALLCK: |                    SENDALL lock                       |
           |-------------------------------------------------------|
   SALCNT: |             Count of Lines Doing SENDALL              |
           |-------------------------------------------------------|
   SALBFR: |                SENDALL Buffer Address                 |
           |-------------------------------------------------------|
   TTFREC: |                 Count of Free Buffers                 |
           |-------------------------------------------------------|
   TTFREB: |                 List of Free Buffers                  |
           |-------------------------------------------------------| / \
   TTSOQ:  |                  Start Output Queue                   |  |
           |                   One Bit Per Line                    |NTSQWD
           |                                                       |  |
           |-------------------------------------------------------| \ /
|          |                                                       | /|\
|  CHSOQ:  |                CTERM Start Output Queue               |CHSQWD
|          |                    1 bit per line                     |  |
|          |-------------------------------------------------------| \ /
   PTYSTM: |                    PTY Start Time                     |
           |-------------------------------------------------------| / \
   TNETRQ: |                Bit Mask for Active Net                |  |
           |                      User Lines                       |NTSQWD
           |                                                       |  |
           |                                                       | \ /
           |-------------------------------------------------------| / \
   TQLNQ:  |                  Bit Matrix for Line                  |  |
           |                    Function Queue                     |NTSQWD
           |                                                       |  |






                                    425
                               MONITOR TABLES
                          TTY-STORAGE-AREA (Cont.)


           |-------------------------------------------------------| \ /
|          |                                                       | /|\
|  SBBITS: |                  SBVECT Bit Mask                      |SBBWDS
|          |                  1 bit per line                       |  | 
|          |-------------------------------------------------------| \ /
   TTBIGI: |              Input Index into Big Buffer              |
           |-------------------------------------------------------|
   TTBIGO: |             Output Index into Big Buffer              |
           |-------------------------------------------------------|
   TTBIGC: |               Char Count in Big Buffer                |
           |-------------------------------------------------------| / \
   TTBBUF: |                      Big Buffer                       |  |
           |                                                       |  |
           | Storage for all TTY Input Chars. Before Being Placed  | TTBSIZ
           |  Into Individual Input Line Buffers in TTBUFS Area    | = 200
           |                                                       |  |
           \                                                       \  |
           |-------------------------------------------------------| \ /
   TTQCNT: |              Count of Special Line Items              |
           |-------------------------------------------------------|
   TTCQLN: |            Control of Current Line Number             |
           |-------------------------------------------------------|
   TTHNGL: |             Line Being Examined for Hung              |
           |-------------------------------------------------------|
   TTHNGT: |      Time at Which Line Will be Defined as Hung       |
           |-------------------------------------------------------|
   TTHNGN: |      Last Hung Line      |    No. of Unhangs Done     |
           |-------------------------------------------------------|
   LINKF:  |           Linked Output Character if not 0            |
           |-------------------------------------------------------|
   IMECHF: |          Immediate Echo Output Char if not 0          |
           |-------------------------------------------------------|
   TTCHIC: |               Input Character in TTCHI                |
           |-------------------------------------------------------|


















                                    426
                               MONITOR TABLES


                                    UD

   This is structure UD, the user data area of a DECnet message.

   Defined in:  D36PAR

                                            Format                                  

          +------------------------------------------------------------------------+   /\   
   UDMSD  |                             Space for MSD                              | MD.LEN 
          \                                                                        \   \/   
          |------------------------------------------------------------------------|       /\       
   UDDAT  |                   Room for 16 bytes always available                   | <<UDH.LN+3>/4> 
          \                                                                        \       \/       
          +------------------------------------------------------------------------+ 






































                                    427
                               MONITOR TABLES


                                    UDB

   Unit Data Block.  This block, one per unit, contains information about
   the current activity on the unit.

   Defined in:  PHYPAR

                                   Format

           +-------------------------------------------------------+
   UDBSTS  |       Status and Configuration Information            | *
           |-------------------------------------------------------|
   UDBST1  |                 Secondary Status Word                 | *
           |-------------------------------------------------------|
   UDBMBW  |        Memory Bandwidth Scheduling Information        |
           |-------------------------------------------------------|
   UDBODT  |         Overdue Timer for Seeks and the Like          |
           |-------------------------------------------------------|
   UDBERR  |              Error Recovery Status Word               |
           |-------------------------------------------------------|
   UDBERP  |         Error Reporting Work Area if Nonzero          |
           |-------------------------------------------------------|
   UDBDSP  |           Unit Routine Main Entry Dispatch            |
           |-------------------------------------------------------|
   UDBCDB  |       Secondary CDB       |        Primary CDB        |
           |-------------------------------------------------------|
   UDBADR  |  Secondary Unit Address   |   Primary Unit Address    |
           |-------------------------------------------------------|
   UDBAKA  |        Current CDB        |  Current Chain Address    |
           |-------------------------------------------------------|
   UDBVID  |                       Volume ID                       |
           |-------------------------------------------------------|
   UDBSTR  |    Unit Within Structure    |    Structure Number     |
           |-------------------------------------------------------|
   UDBKDB  |                Pointer to KDB, if any                 |
           |-------------------------------------------------------|
   UDBDSH  |            High Order Drive Serial Number             |
           |-------------------------------------------------------|
   UDBDSN  |                  Drive Serial Number                  |
           |-------------------------------------------------------|
   UDBSEK  |                         Seeks                         |
           |-------------------------------------------------------|
   UDBRED  |        Reads (Sectors if Disk, Frames if Tape)        |
           |-------------------------------------------------------|
   UDBWRT  |       Writes (Sectors if Disk, Frames if Tape)        |
           |-------------------------------------------------------|
   UDBRCT  |                  Actual read count                    |
           |-------------------------------------------------------|
   UDBWCT  |                 Actual write count                    |
           |-------------------------------------------------------|
   UDBRVC  |         Actual Skip Read (Read Verify) Count          |


                                    428
                               MONITOR TABLES
                                UDB (Cont.)


           |-------------------------------------------------------|
   UDBSRE  |                   Soft Read Errors                    |
           |-------------------------------------------------------|
   UDBSWE  |                   Soft Write Errors                   |
           |-------------------------------------------------------|
   UDBHRE  |                   Hard Read Errors                    |
           |-------------------------------------------------------|
   UDBHWE  |                   Hard Write Errors                   |
           |-------------------------------------------------------|
   UDBPS1  |      Current Cylinder (if Disk), File (if Tape)       |
           |-------------------------------------------------------|
   UDBSP2  |      Current Sector (if Disk), Record (if Tape)       |
           |-------------------------------------------------------|
   UDBPWQ  | Position Wait Queue Tail  | Position Wait Queue Head  |
           |-------------------------------------------------------|
   UDBTWQ  | Transfer Wait Queue Tail  | Transfer Wait Queue Head  |
           |-------------------------------------------------------|
   UDBONR  |        Fork Which Owns This Unit (Maint. Mode)        |
           |-------------------------------------------------------|
   UDBERC  |                  Current Retry Count                  |
           |-------------------------------------------------------|
   UDBSPE  |                Soft Positioning Error                 |
           |-------------------------------------------------------|
   UDBHPE  |                Hard Positioning Error                 |
           |-------------------------------------------------------|
   UDBPNM  |             Program Name to Log on Error              |
           |-------------------------------------------------------|
   UDBUDR  |         User Directory Number to Log on Error         |
           |-------------------------------------------------------|
   UDBSIZ  |            Unit Size (Number of Cylinders)            |
           |-------------------------------------------------------|
   UDBFCT  |                  Seek Fairness Count                  |
           |-------------------------------------------------------|
   UDBCHB  |             IORB Used by Home Block Check             |
           |-------------------------------------------------------|
   UDBFCR  |         Fairness Cnt. for Read Seek Preference        |
           |-------------------------------------------------------|
   UDBSLV  |                Slave number if tape                   |
           |-------------------------------------------------------|
   UDBCHR  |                Characteristics word                   |
           |-------------------------------------------------------|
   UDB2ND  |    Pointer to UDB for Dynamic Alternate Port          |
           |-------------------------------------------------------|
   UDBALT  |    Pointer to UDB for Static Alternate Port           |
           |-------------------------------------------------------|
   UDBDDP  |    Device Dependent Parts for MTA or for DSK          |
           |                                                       |
           |                                                       |
           |                                                       |
           \                                                       \
           +-------------------------------------------------------+

                                    429
                               MONITOR TABLES
                                UDB (Cont.)


   Device Dependent Parts for disks:

           +-------------------------------------------------------+
   UDBDDP= |              HOMNAM   SIXBIT/HOM/                     |
   UDBNAM  |                                                       |
           |-------------------------------------------------------|
   UDBHID: |              HOMID    SIXBIT/Unit ID/                 |
           |-------------------------------------------------------|
   UDBHM2: |                        Unused                         |
           |-------------------------------------------------------|
   UDBSNM: |              HOMSNM   SIXBIT/Structure Name/          | 
           |-------------------------------------------------------|
   UDBLUN: |    # of Parks in STR     |   Logical Park # in STR    |
           |-------------------------------------------------------|
   UDBMID: |              HOMMID   Pack Unique Code                |
           |-------------------------------------------------------|
   UDBDCF: |              Don't care  Flags word                   |
           |-------------------------------------------------------|
   UDBCOD: |              HOMCOD  0   |   CODHOM (707070)          |
           |-------------------------------------------------------|
   UDBPDB= |                Two-word Serial Number                 |
   UDBSER  |                                                       |
           |-------------------------------------------------------|
   UDBNPR: |                Non-CI Processor Info                  |
|          |-------------------------------------------------------| / \
|  UDBP00: |                     Node 0 Info                       |  |
|          |-------------------------------------------------------|
|  UDBP01: |                     Node 1 Info                       |*
|          |-------------------------------------------------------|*
|    .     |                          .                            |*
|    .     |                          .                            |*
|    .     |                          .                            |*
|    .     |                          .                            |*
|          |-------------------------------------------------------|
|  UDBP15: |                     Node 15 Info                      |*
|          |-------------------------------------------------------|
   UDBDDD= |                                                       |
   RP.CNI  |                      CONI of RH                       |
           |-------------------------------------------------------|
   RP.CRC  |             DATAI of RH Control Register              |
           |-------------------------------------------------------|
   RP.DBF  |              DATAI of RH Data Register                |
           |-------------------------------------------------------|
   RP.CYL  |             Number of Cylinders per unit              |
           |-------------------------------------------------------|
   RP.SCL  |             Number of Sectors per Cylinder            |
           |-------------------------------------------------------|
   RP.SSF  |             Number of Sectors per Surface             |
           |-------------------------------------------------------|
   RP.USU  |             Number of USEC per LA REG Unit            |


                                    430
                               MONITOR TABLES
                                UDB (Cont.)


           |-------------------------------------------------------|
   RP.USF  |                SSF * 64 (LA REG Unit)                 |
           |-------------------------------------------------------|
   RP.LST  |             Start of Last Page on a Cylinder          |
           |-------------------------------------------------------| / \
   RP.REG  |                    Drive Registers                    |  |
           |                                                       |  |
           |                                                       |  |
           |                                                       |  20
           |                                                       |  |
           /                                                       \  |
           |                                                       |  |
           +-------------------------------------------------------+ \ /

   L.RP4 = Length of RP04/5/6/7   UDB

|  Words UDBP00 through UDBP15 have the following format:
|  
|           0                                             33 34 35
|          +------------------------------------------------------+
|          |          Node Server Number,,               |  |  |  |
|          +------------------------------------------------------+
|  
|          Symbol     Bit    Meaning
|  
|          UDB%MA     33     Node in maintenance mode
|          UDB%WA     34     Wire A is good
|          UDB%WB     35     Wire B is good
























                                    431
                               MONITOR TABLES
                                UDB (Cont.)



   Device Dependent Parts for Tapes:

           +-------------------------------------------------------+
   UDBDDP= |             Frames Read in NRZJ (Magtape)             |
   UDBRNR  |                                                       |
           |-------------------------------------------------------|
   UDBRPE  |                  Frames Read in PE                    |
           |-------------------------------------------------------|
   UDBRGC  |                  Frames Read in GCR                   |
           |-------------------------------------------------------|
   UDBRNR  |                Frames Written in NRZI                 |
           |-------------------------------------------------------|
   UDBWPE  |                 Frames Written in PE                  |
           |-------------------------------------------------------|
   UDBWGC  |                 Frames Written in GCR                 |
           |-------------------------------------------------------|
   UDBDDM= |              Hardware-Determined Density              |
   TU6HDN  |                                                       |
           |-------------------------------------------------------|
   TU6EPS  |                     Error Position                    |
           |-------------------------------------------------------|
   TU6EBP  |                   Error Byte Pointer                  |
           |-------------------------------------------------------|
   TU6EBC  |                   Error Byte Counter                  |
           |-------------------------------------------------------|
   TU6ECL  |                   Tape Cleaner Flag                   |
           +-------------------------------------------------------+

   LU.TM2 = Length of TM02 UDB

   UDBPDB through UDBP15 is a copy of  the  PDB  (processor  data  block)
   which resides on sector 3 of a disk.  It has the same format.



















                                    432
                               MONITOR TABLES
                                UDB (Cont.)


                                                24  26       31  35
           +-------------------------------------------------------+
   UDBSTS  |                                   |      |     |      |
           +-------------------------------------------------------+


        Symbol    Bits     Pointer     Content

        US.OFS      0      USOFL       Offline or unsafe
        US.CHB      1                  Check home blocks before any
|                                       normal I/O
        US.POS      2                  Positioning in progress
        US.ACT      3                  Active
        US.BAT      4                  Off if bad BAT blocks on this unit
        US.BLK      5                  Lock bit for this units BAT blocks
        US.PGM      6                  Dual port switch in (A or B) 
                                        (RP04,5,6)
        US.MAI      7                  Unit is in MAINT mode
        US.MRQ      8                  MAINT mode is requested on this 
                                        unit
        US.BOT      9                  Unit is at BOT
        US.REW     10                  Unit is rewinding
        US.WLK     11                  Unit is write locked
        US.CIP     12                  Unit is on a CI port
        US.OIR     13                  Operator intervention required.
                                       Set at interrupt level, checked at
                                        SCHED.
        US.OMS     14                  Once a minute message to operator.
                                       Used in conjunction with US.OIR
        US.PRQ     15                  Positioning required on this unit
        US.TAP     16                  Tape type device
        US.PSI     17                  PSI online/offline/rewind done
                                        transition occurred
        US.DSK     18                  Disk type device
        US.OR1     19                  1st overdue rewind timer bit
        US.OR2     20                  2nd overdue rewind timer bit
        US.2PT     21                  Drive may be dual-ported
                                        between systems
        US.TPD     22                  Disk is offline to prevent
                                        three ports
        US.BDK     23                  CI broadcast needed
        US.RTY    24-26                Retry count field
        US.CIA     27                  CI available
        US.UNA     28                  Device unavailable (like 16 bit 
                                        disk)
                  31-35    USTYP       Unit Type






                                    433
                               MONITOR TABLES
                                UDB (Cont.)


                            Type Code for USTYP


        Symbol    Code Unit            Symbol    Code Unit

        .UTRP4      1  RP04            .UTT70     17  TU70
        .UTRS4      2  RS04            .UTT71     20  TU71
        .UTT45      3  TU45            .UTT72     21  TU72
        .UTTM2      4  TM02 (as unit)  .UTT73     22  TU7X
        .UTRP5      5  RP05            .UTDXB     23  DX20B for RP20
                                                      disks
        .UTRP6      6  RP06            .UTP20     24  RP20
        .UTRP7      7  RP07            .UTNOD     25  CI node w/o MSCP
                                                      server
        .UTRP8     10  RP08            .UTHSC     26  HSC50
        .UTRM3     11  RM03            .UTR80     27  RA80
        .UTTM3     12  TM03            .UTR81     30  RA81
        .UTT77     13  TU77            .UTR60     31  RA60
        .UTTM7     14  TM78            .UTR82     32  RA82 (future)
        .UTT78     15  TU78            .UTR62     33  RA62 (future)
        .UTDXA     16  DX20A for tapes .UTTA7     34  TA78

            0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
           +-------------------------------------------------------+
   UDBST1  | | | | | | | | | | |  |  |  |  |  |                    |
           +-------------------------------------------------------+


                  Symbol   Bits        Content

                  U1.OFS     0         Forced offline dual ported disk
                  U1.FED     1         UDB ported to front-end
                  U1.DCD     2         Disk with don't care set
                  U1.DCU     3         UDB don't care set
                  U1.HBR     4         Home block read in progress
                  U1.PDW     5         PDW write in progress
                  U1.STC     6         Status change while reading
                                        home blocks
                                        therefore we must do it again
                  U1.DCR     7         Don't care about this dual
                                        ported disk
                                        (U1.DCD!U1.DCU composite)
                  U1.PHB     8         Primary Home block bad
                  U1.SHB     9         Secondary home block bad
                  U1.PDR    10         PDV read in progress
                  U1.VV     11         Volume valid
                  U1.ODT    12         Overdue IORB Indicator
                  U1.SOF    13         Structure timer is triggered
|                 U1.NOL    14         Unit not online; wait while
|                                       searching for login structure


                                    434
                               MONITOR TABLES


                                  UDIORB

   UDSKIO IORB Pool.  The free IORBS are linked together  in  UDIORB  and
   this list is pointed to by UIOLST.  Used for disk IORBs (long).

   Defined in:  STG

                                   Format

           +-------------------------------------------------------+ / \
   UDIORB: |                                                       |  |
           |                                                       |  |
           \                                                       \  |
           |-------------------------------------------------------|  |
           |                                                       |  |
           |                           .                           |  |
           |                           .                           | NUIORB
           |                           .                           |   *
           |                                                       | UIOLEN
           \                                                       \  |
           |-------------------------------------------------------|  |
           |                                                       |  |
           |                                                       |  |
           \                                                       |  |
           +-------------------------------------------------------+ \ /




























                                    435
                               MONITOR TABLES


                                    UDS

   Unit Dispatch Service Routine Table.  This table, one per  unit  type,
   contains  vectored addresses to unit dependent functions, and is given
   in its generalized form.  The specific unit dispatch tables are RP4DSP
   (in  PHYP4) for the disk device, and TM2DSP (in PHYM2) for the magtape
   device.  See PHYPAR for definitions of arguments given and returned on
   calls to these unit routines.

   Defined in:  PHYPAR

                                   Format

            +-------------------------------------------------------+
   UDSINI=0 |                      Initialize                       |
            |-------------------------------------------------------|
   UDSSIO=1 |          Start I/O on an IORB, skips if O.K.          |
            |-------------------------------------------------------|
   UDSINT=2 |Interrupt Routine (called on interrupts for XFER done) |
            |-------------------------------------------------------|
   UDSERR=3 |    Initiate Error Retry (skips if no more retrys)     |
            |-------------------------------------------------------|
   UDSHNG=4 | Hung Reset (called from TIMER to reset hung devices)  |
            |-------------------------------------------------------|
   UDSCNV=5 |     Convert Unit Linear Address to CYL, SURF, SEC     |
            |-------------------------------------------------------|
   UDSLTM=6 |            Return Latency or Best Request             |
            |-------------------------------------------------------|
   UDSPOS=7 |      Start Positioning on IORB (skips if O.K.)        |
            |-------------------------------------------------------|
   UDSATN=10|                  Attention Interrupt                  |
            |-------------------------------------------------------|
   UDSPRQ=11|               Skip if Positioning Required            |
            |-------------------------------------------------------|
   UDSSTK=12|               Stack Second Command, Skip if OK        |
            |-------------------------------------------------------|
   UDSEXT=13|        Check Legality of Unit, Skip if Existant       |
            |-------------------------------------------------------|
   UDSCCK=14|        Check for Halted Microcode in Controllers      |
            |-------------------------------------------------------|
   UDSPRL=15|                      Release Port                     |
            +-------------------------------------------------------+











                                    436
                               MONITOR TABLES


                                    UE

   This is an NI% user argument block (UN) extension,  used  for  linking
   message buffers on and off the LAT message queues.

   Defined in:  LATSRV

                                            Format                                  

          +------------------------------------------------------------------------+ 
   UELW0  |              Queue Link Word for linking buffers to CB Qs              | 
          |------------------------------------------------------------------------| 
   UELW1  |              Queue Link Word for linking buffers to NI Qs              | 
          +------------------------------------------------------------------------+ 







































                                    437
                               MONITOR TABLES


                                    UN

   UN is the common argument block passed by  all  users  of  NISRV,  the
   Network Interconnect Server.

   Defined in:  NIPAR

                                            Format                                  

|          0   2 3 4 5 6 7 8
|         +------------------------------------------------------------------------+ 
|         |     | | |   | | |                 |               UNPRO                |*
          |     | | |   | | |                 |           Protocol type            |
          |------------------------------------------------------------------------| 
          |               UNTDR               |               UNPMS                |
          |  Time Domain Reflectometry value  |           PI level mask            |
          |------------------------------------------------------------------------| 
   UNPID  |                                Portal ID                               | 
          |------------------------------------------------------------------------| 
   UNUID  |                        User's ID for this portal                       | 
          |------------------------------------------------------------------------| 
   UNRID  |                               Request ID                               | 
          |------------------------------------------------------------------------| 
   UNSTA  |                             Channel status                             |*
          |------------------------------------------------------------------------| 
   UNCBA  |                     Call back address (NU.OPN only)                    | 
          |------------------------------------------------------------------------| /\
   UNBFA  |                             Buffer address                             | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   UNBSZ  |                               Buffer size                              |   
          |------------------------------------------------------------------------| /\
   UNSAD  |                         Source Ethernet address                        | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| /\
   UNDAD  |                      Destination Ethernet address                      | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
   UNSPI  |                           Secondary portal ID                          |*
          |------------------------------------------------------------------------| /\
   UNCAR  |                        Current Ethernet address                        | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| /\
   UNHAD  |                            Hardware address                            | 2 
          \                                                                        \ \/
          |------------------------------------------------------------------------| 
          |               UNOXM               |               UNORC                |
          |      # Outstanding transmits      |      # Outstanding receives        |
          +------------------------------------------------------------------------+ 




                                    438
                               MONITOR TABLES
                                 UN (Cont.)


|                Field      Bit    Meaning
|  
|                UNCHN      0-2    Storage for the NI channel number
|  
|                UNPAD      #3     Use padding for this portal (NU.OPN only)
|  
|                UNZRO      #4     Zero counters after reading
|  
|                UNADS      5-6    Address space of xmit or rcv buffer
            
|                                  UNA.EV=0  Exec virtual
|                                  UNA.UV=1  User virtual
|                                  UNA.PH=2  Physical
|  
|                UNPTR      #7     UNDAD contains a byte pointer
|  
|                UNRSP      #8     Response desired
           0 1                         17 18             26 27                   35
          +------------------------------------------------------------------------+
   UNSTA  | |                            |     UNSST       |     UNEXS             |
          +------------------------------------------------------------------------+ 

        Symbol    Bit     Contents

        UNRUN      0-1    Channel is running; should be 1b0
        UNSST     18-26   Channel substate
        UNEXS     27-35   Channel external state


           0                8 9                                                  35
          +------------------------------------------------------------------------+
   UNSPI  |  UNEXI           |                                                     |
          +------------------------------------------------------------------------+ 

        Symbol    Bit     Contents

        UNEXI      0-8    External portal ID















                                    439
                               MONITOR TABLES


                                    UPT

   User Process Table.  A one page User Process Table is associated  with
   the  process  controller  and  with  each  fork in the system.  (Those
   associated with forks may be swapped  out  with  the  fork.)  However,
   there  is only one UPT known to the hardware/firmware at any one time.
   The UPT known is the one whose address is pointed to by  the  hardware
   User  Base Register (UBR), which is set-up when a process is chosen to
   run.  UPT contains the dispatch  address  for  process  events  (i.e.,
   traps) and the user's section map table.

   Defined in:  STG

                                   Format

            HWPTA: +-------------------------------------+ 
                   |                                     |
                   |        Available to Software        | 
                   |                                     |
                   \                                     \
                   |-------------------------------------| / \
          UPTPPM=  |                                     |  |
          HWPTA+400\              Reserved               \ 20
                   |                                     |  |
                   |-------------------------------------| \ /
          UPTTPI=  |        Address of LUUO Block        |  
   KLLUUO=HWPTA+420|                                     |  
                   |-------------------------------------|  
          UPTOVI=  |User Arith. Overflow Trap Instruction|  
          HWPTA+421|                                     |  
                   |-------------------------------------| 
                   |User Stack Overflow Trap Instruction |
                   |-------------------------------------|
                   |    User Trap 3 Trap Instruction     |
                   |-------------------------------------|
          KIMUFL=  |     MUUO flags   |    MUUO OP-AC    | 
   FFL=   HWPTA+424|                  |                  | 
                   |-------------------------------------|
          KIMUPC=  |             MUUO Old PC             | 
   FPC=   HWPTA+425|                                     | 
                   |-------------------------------------|
          KIMUEF=  |              E of MUUO              | 
          HWPTA+426|                                     | 
                   |-------------------------------------|
          KIMPCW=  |        MUUO Process Context         | 
   UPTPCW=HWPTA+427|                                     | 







                                    440
                               MONITOR TABLES
                                UPT (Cont.)


                   |-------------------------------------|
          UPTDSP=  |  Kernel No Trap MUUO New PC (word)  | 
          HWPTA+430|                                     | 
                   |-------------------------------------|
                   |   Kernel Trap MUUO New PC (word)    |
                   |-------------------------------------|
                   |Supervisor No Trap MUUO New PC (word)|
                   |-------------------------------------|
                   | Supervisor Trap MUUO New PC (word)  |
                   |-------------------------------------|
                   |Concealed No Trap MUUO New PC (word) |
                   |-------------------------------------|
                   |  Concealed Trap MUUO New PC (word)  |
                   |-------------------------------------|
                   |  Public No Trap MUUO New PC (word)  |
                   |-------------------------------------|
                   |   Public Trap MUUO New PC (word)    |
                   |-------------------------------------|
          HWPTA+440|        Reserved for software        |
                   |                                     |
                   \                                     \
                   |-------------------------------------|
          UPTPFW=  |           Page Fail Word            | 
   TRAPS0=HWPTA+500|                                     | 
                   |-------------------------------------|
          UPTPFL=  |           Page Fail Flags           | 
   TRAPFL=HWPTA+501|                                     | 
                   |-------------------------------------|
          UPTPFO=  |          Page Fail Old PC           | 
   TRAPPC=HWPTA+502|                                     | 
                   |-------------------------------------|
          UPTPFN=  |          Page Fail New PC           | 
          HWPTA+503|                                     | 
                   |-------------------------------------|
          HWPTA+504|                                     |
          HWPTA+505|     User Process Execution Time     |
                   |-------------------------------------|
          HWPTA+506|                                     |
          HWPTA+507|     User Memory Reference Count     |
                   |-------------------------------------|
          HWPTA+510|                                     |
                   |                                     |










                                    441
                               MONITOR TABLES
                                UPT (Cont.)


                   |-------------------------------------|
          USSPTB=  |       User Super Section Table      |
          HWPTA+520|                                     |
                   |-------------------------------------|
          USECTB=  |        User Section 0 Pointer       | 
          HWPTA+540|        User Section 1 Pointer       | 
                   |                .                    |
                   |                .                    |
                   |                .                    |
          HWPTA+577\        User Section 37 Pointer      \
                   |-------------------------------------|
          HWPTA+600|                                     |
                   |        Available to software        |
          HWPTA+777\                                     \
                   +-------------------------------------+

   Note:  Approximately 1/4 of  the  UPT  is  used  for  hardware  cells,
   leaving  the  rest  available to software.  The monitor currently uses
   this area to house the first page of the PSB table.   (See  PSB  table
   description.)
































                                    442
                               MONITOR TABLES


                              USER-PG-MAP-TBL

   User Page Map Table.  This 512-word swappable table, holds  or  points
   to other tables that hold all of the mapping information needed by the
   firmware to translate user mode virtual addresses in a  given  section
   into  physical  memory addresses.  It is pointed to by an entry in the
   forks' section table in its User Process Table (UPT).  (See UPT  table
   description.)

   The User Page Map, indexed  by  a  9  bit  virtual  page  number  (1),
   contains  either  the storage address for the virtual page if the page
   exists (immediate pointer) or a pointer to where the  storage  address
   resides  in  another  table (shared or indirect pointer).  The storage
   address can be a memory, swapping area, or disk page address.

   If the Storage address for the virtual page referenced by the  process
   contains a memory page address (i.e., Storage Address Bits <12-17>=0),
   then the microcode, after copying this translation  information  along
   with  the  page's  access bits into the CPU's Hardware Page Table (2),
   concatenates this memory page number with the index into the  page  to
   compose the complete physical address.

   If the storage address  for  the  virtual  page  referenced  does  not
   contain a memory address (i.e., Storage Address Bits <12-17> not equal
   to 0), or the page is non-existant (i.e., Null Pointer  word)  or  the
   page is being illegally accessed, the microcode will cause a page trap
   to the User Process Table (UPT).   The  monitor  is  then  invoked  to
   perform the analysis and resolution of the trap condition.

   Defined in:  PROLOG























                                    443
                               MONITOR TABLES
                          USER-PG-MAP-TBL (Cont.)


                                   Format
   UPTPGA: +-------------------------------------------------------+  / \
          0|                                                       |   |
           |                   Immediate Pointer                   |   |
           |-------------------------------------------------------|   |
           |0    2| 3         8|       | 12                      35|   |
           | Op   |Access Bits |       |    STGADR                 |   |   
           | Code |            |       |  Storage Address          |   |
           |  1   |            |       |                           |   |
           |-------------------------------------------------------|   |
           |                          or                           |   |
           |                                                       |   |
           |                    Shared Pointer                     |   |
           |-------------------------------------------------------|   |
           |0  2 |3        8|          |18                       35|   |
           | Op  | Access   |          | SPTX                      |   |
           | Code|   Bits   |          |  SPT. index               |
           |  2  |          |          |  (Holds Pg's Stor Adr.)   |Virtual
           |-------------------------------------------------------|  Pg#
           |                          or                           |(0-777
           |                                                       | octal)
           |                   Indirect Pointer                    |
           |-------------------------------------------------------|   |
           |0  2 |3      8 |9       17 |18                      35 |   |
           | Op  | Access  | IPPGN     | SPTX                      |   |
           | Code|  Bits   |    PN     | SPT index                 |   |
           |  3  |         |           | (Holds Pg Tbl's Stor. Adr)|   |
           |-------------------------------------------------------|   |
           |                          or                           |   |
           |                                                       |   |
           |                     Null Pointer                      |   |
           |-------------------------------------------------------|   |
           |0  2 |3         8|                                     |   |
           |Op   |Access Bits|         0 (Nonexistent Pg)          |   |
           |Code |           |                                     |   |
           |  0  |      0    |                                     |   |
           |-------------------------------------------------------|   |
           |                           .                           |   |
           |                           .                           |   |
           \                           .                           \  \ /
           +-------------------------------------------------------+

       *  UPTPGA is the monitor's symbol used when it wishes to
          reference the current user's page map table for section 0.

       (1)  A fork's virtual 18-bit address within a section
            is viewed as an address within a 512-word page,
            (i.e., virtual page number - 9 bits), Index into
            page 9-bits.



                                    444
                               MONITOR TABLES
                          USER-PG-MAP-TBL (Cont.)


       (2)  This 512-word table is examined first by the 
            microcode for the virtual page translation
            information.  If not there, it then goes to
            the fork's UPTA in memory.

                 0 2 3 4 5 6 7 8 9                                    35
                +-------------------------------------------------------+
   Page Pointer |   | | | | | | |Dependent on Pointer Type in Bits <0-2>|
    Word        +-------------------------------------------------------+


        Symbol    Bits                 Meaning

        PTRCOD     0-2                 Operation Code for the page
                                        pointer type
                                         IMMCOD = 1  Immediate Pointer
                                         SHRCOD = 2  Share Pointer
                                         INDCOD = 3  Indirect
|       PTPUB       3                  Public Bit
        PTWR        4                  Write Access
        PTKEEP      5                  'Keep' Bit*
        PTCACH      6                  Cache Bit
        PTCPY       7                  Copy-on-Write (Software Only)
        PTSECM      8                  Section is mapped
        PTLOK       9                  Page is Locked (Immediate
                                        Pointer only)

   * Once the Keep bit is set in the hardware page table,  the  entry  is
   kept until one of the following conditions occurs:

        1.  DATAO PAG is executed with bit 3 reset in E

        2.  CONO PAG is executed

        3.  A  reference  to  another  section  causes  a   refill   that
            overwrites the entry.
















                                    445
                               MONITOR TABLES
                          USER-PG-MAP-TBL (Cont.)



   Pointer Types:
                        0   2 3         8 9  11 2 3 4 5 6 7 18         35
                       +-------------------------------------------------+
     Immediate Pointer |  1  |Access Bits|     | | | | | | |             |
                       +-------------------------------------------------+


        Symbol    Bits     Pointer     Meaning

                   0-8     See above

                   STORAGE ADDRESS

                  12-35    STGADR      Storage address
                                        (Interpretation follows)
        NCORTM    12-17                Non-Core Test Mask yielding 
                                        type of storage.
                                       Bits <12-17>=0 =>
                                       Bits <18-35>=Memory Pg Adr.
                                       Bits <12-17> not equal 0 =>
                                       Bits <18-35>=Drum/DSK Adr.
        DSKAB       14                 Storage address is a disk
                                        address
        DSKNB       15                 Temporary bit used with DSKAB
                                        to say that disk address is
                                        newly assigned.
        DRMAB       16                 Storage address is a drum
                                        address
        DRMOB       17                 Used with DRMAB to indicate 
                                        that the swapping area has
                                        overflowed to the disk file
                                        system.  (Since TOPS-20 
                                        currently uses only the disk
                                        file system for swapping, a
                                        drum storage address will 
                                        always have bits 16  17 set.)
        UAABC     17&35                Temporary bit used by the
                                        monitor's page trap handler
                                        when a copy-on-write page
                                        trap has occurred.  If the 
                                        page to be copied is a drum
                                        address, it will be faulted 
                                        in before these bits are used,
                                        avoiding conflict over bit 17.
                                        These bits will signify to a
                                        lower level routine, SWPIN, 
                                        that the page just gotten from
                                        the free list has no backup
                                        address and that it is to get
                                        a copy of another page.

                                    446
                               MONITOR TABLES
                          USER-PG-MAP-TBL (Cont.)


                   0   2 3         8 9  11 2 3 4 5 6 7 18          35
                  +-------------------------------------------------+
     Null Pointer |  0  |Access Bits|     | | | | | | |             |
                  +-------------------------------------------------+


                  Symbol   Bits        Meaning

                            0-8        These bits will have a value
                                        of 0 for the Null Pointer
                                        case.
                  UAAB       17        Temporary bit used by the
                                        monitor's page trap handler
                                        to say that the page has no
                                        assigned backup address on
                                        disk/drum.


                     0 1 2 3    8               18                    35
                    +---------------------------------------------------+
     Shared Pointer |  2  |Access|             |      SPTX              |
                    |     |  Bits|             |         SPT index      |
                    +---------------------------------------------------+


                  Bits     Pointer     Meaning

                   0-8                 See Above
                  18-35    SPTX        The SPT index is used
                                        to obtain from the SPT,
                                        the page's storage
                                        address.




















                                    447
                               MONITOR TABLES
                          USER-PG-MAP-TBL (Cont.)


                       0 1 2 3    8 9          17 18                    35
                      +---------------------------------------------------+
     Indirect Pointer |  3  |Access| IPPGN       | SPTX                   |
                      |     |  Bits|   Page #    |    SPT index           |
                      +---------------------------------------------------+


                  Bits     Pointer     Meaning

                   0-8                 See Above
                   9-17    IPPGN       Page # whose value is used
                                        as an offset into the Page
                                        Table (pointed to by the 
                                        SPT table address plus the
                                        SPT index in bits <18-35>)
                                        to obtain the page's trans-
                                        lation information.
                  18-35    SPTX        The SPT index is used to 
                                        obtain from the SPT the
                                        page table's storage 
                                        address.  The table's
                                        address plus the offset
                                        specified in bits <9-17>
                                        holds the virtual page's
                                        translation information.



























                                    448
                               MONITOR TABLES


|                                  VANA
|  
|  Vote Answer Area.  The VANA is used  by  routines  which  compose  the
|  reply  to  an  incoming vote (Request Message Set).  VANA has the same
|  format as VRQA with the exception that "Assorted  Reserved  Locations"
|  is not used.
|  
|  Defined in:  ENQSRV
|  
|  
|  VANA:    +-------------------------------------------------------+
|           \                                                       \
|           \                                                       \
|           \              Header Area (Not Used)                   \
|           \                                                       \
|           \                                                       \
|           |-------------------------------------------------------|
|           | EBDOFF                    | EBPKTN      | EBPNUM      |
|  .MHUDA   |.MHUDA offset to data start| Total # msg | This msg #  |
|           |-------------------------------------------------------|
|           | EBFLAG          | EBCFSC  | EBUNIQ                    |
|  .EBFFW   |      Flags      |Function |Unique code for message set|
|           |-------------------------------------------------------|
|           | EBNODE          | EBFTYP  | EBTOTT                    |
|  .EBEOH   | CI node number  | Opcode  |User words for this packet |
|           |-------------------------------------------------------|
|           | EBQFLG          |         | EBTYPE                    |
|  .EBSOD   |     ENQFLG      |Reserved |      OFN or -2 or -3      |
|           |-------------------------------------------------------|
|           | EBSTRN                                                |
|  .EBFL1   |               Structure name in Sixbit                |
|           |-------------------------------------------------------|
|           | EBADDR                                                |
|  .EBFL2   |              Storage Address (from SPTH)              |
|           |-------------------------------------------------------|
|           | EBGRP                     | EBHASH                    |
|  .EBGHV   |       Group number        | Hash value for Lock-Block |
|           |-------------------------------------------------------|
|           | EBMBWS                    | EBTSWS                    |
|  .EBWCT   | # of words in Mask Block  | # of words in Text String |
|           |-------------------------------------------------------| /|\
|  .EBSMB   \                                                       \ 15
|           \                      Mask Block                       \ Words
|           \                                                       \ \|/
|           |-------------------------------------------------------| / \
|           \                                                       \  |
|           \                     ASCIZ String                      \ 50
|           \                          or                           \ Words
|           \                 500000,,0 + User Code                 \  |
|           \                                                       \ \ /



                                    449
                               MONITOR TABLES
|                               VANA (Cont.)


|           |-------------------------------------------------------| /|\
|           \                                                       \ 3
|           \                 Additional Data Area                  \ Words
|           \                                                       \ \|/
|           +-------------------------------------------------------+
|  














































                                    450
                               MONITOR TABLES


                                    VN

   VN contains the DECnet NSP and Routing Version number words.

   Defined in:  D36PAR

                                            Format                                  

|          0             7 8            15 16           23
          +------------------------------------------------------------------------+ 
          |     VNVER     |     VNECO     |     VNUCO     |                        |
          |Version number |  ECO number   |User ECO number|                        |
          +------------------------------------------------------------------------+ 








































                                    451
                               MONITOR TABLES


|                                   VRB
|  
|  Vote Request Buffer.  VRB is used to send the reply back to  the  node
|  which  issued the vote request.  All replies only require a single SCA
|  message buffer.
|  
|  Defined in:  ENQSRV
|  
|           +-------------------------------------------------------+
|           \                                                       \
|           \                      Port Header                      \
|           \                          and                          \
|           \                       SCA Header                      \
|           \                                                       \
|           |-------------------------------------------------------|
|           | EBDOFF                    | EBPKTN      | EBPNUM      |
|  .MHUDA   |.MHUDA offset to data start| Total # msg | This msg #  |
|           |-------------------------------------------------------|
|           | EBFLAG          | EBCFSC  | EBUNIQ                    |
|  .EBFFW   |      Flags      |Function |Unique code for message set|
|           |-------------------------------------------------------|
|           | EBNODE          | EBFTYP  | EBTOTT                    |
|  .EBEOH   | CI node number  | Opcode  |User words for this packet |
|           |-------------------------------------------------------|
|           | EBQFLG          |         | EBTYPE                    |
|  .EBSOD   |     ENQFLG      |Reserved |      OFN or -2 or -3      |
|           |-------------------------------------------------------|
|           | EBSTRN                                                |
|  .EBFL1   |               Structure name in Sixbit                |
|           |-------------------------------------------------------|
|           | EBADDR                                                |
|  .EBFL2   |              Storage Address (from SPTH)              |
|           |-------------------------------------------------------|
|           | EBGRP                     | EBHASH                    |
|  .EBGHV   |       Group number        | Hash value for Lock-Block |
|           |-------------------------------------------------------|
|           | EBMBWS                    | EBTSWS                    |
|  .EBWCT   | # of words in Mask Block  | # of words in Text String |
|           |-------------------------------------------------------|
|  .EBAD1   |                Additional Data word 1                 |
|           |-------------------------------------------------------|
|  .EBAD2   |                Additional Data word 2                 |
|           |-------------------------------------------------------|
|  .EBAD3   |                Additional Data word 3                 |
|           +-------------------------------------------------------+
|  







                                    452
                               MONITOR TABLES


|                                  VRPA
|  
|  Vote Reply Area.  VRPA is used to collect  the  replies  to  the  vote
|  request.
|  
|  Defined in:  ENQSRV
|  
|  VRPA:    +-------------------------------------------------------+
|           | VPFLAG          |         | VPUNIQ                    |
|  .VPWD0   |     Flags       |Reserved |Unique code for message set|
|           |-------------------------------------------------------|
|  .VPAD1   |                Additional Data word 1                 |
|           |-------------------------------------------------------|
|  .VPAD2   |                Additional Data word 2                 |
|           |-------------------------------------------------------|
|  .VPAD3   |                Additional Data word 3                 |
|           +-------------------------------------------------------+
|  
|  
|           +-------------------------------------------------------+
|           | VPFLAG          |         | VPUNIQ                    |
|  .VPWD0   |     Flags       |Reserved |Unique code for message set|
|           +-------------------------------------------------------+
|  
|  
|  
|            Contents of VPFLAG:
|  
|            Symbol    Bits  Meaning
|  
|            VPNOV      0    No vote required for this lock
|            VPNO       1    A "NO" reply was received from another node
|            VPRTY      2    A cluster state change occurred
|  
|  


















                                    453
                               MONITOR TABLES


|                                  VRQA
|  
|  Vote Request Area.  VRQA is used by Interface Routines to compose  the
|  Request  Message  Set.   The  ten  words  of  header exist so that the
|  offsets exactly match the SCA message buffer in  the  Request  Message
|  Set.
|  
|  Defined in:  ENQSRV
|  
|  VRQA:    +-------------------------------------------------------+
|           \                                                       \
|           \                                                       \
|           \              Assorted Reserved Locations              \
|           \                                                       \
|           \                                                       \
|           |-------------------------------------------------------|
|           | EBDOFF                    | EBPKTN      | EBPNUM      |
|  .MHUDA   |.MHUDA offset to data start| Total # msg | This msg #  |
|           |-------------------------------------------------------|
|           | EBFLAG          | EBCFSC  | EBUNIQ                    |
|  .EBFFW   |      Flags      |Function |Unique code for message set|
|           |-------------------------------------------------------|
|           | EBNODE          | EBFTYP  | EBTOTT                    |
|  .EBEOH   | CI node number  | Opcode  |User words for this packet |
|           |-------------------------------------------------------|
|           | EBQFLG          |         | EBTYPE                    |
|  .EBSOD   |     ENQFLG      |Reserved |      OFN or -2 or -3      |
|           |-------------------------------------------------------|
|           | EBSTRN                                                |
|  .EBFL1   |               Structure name in Sixbit                |
|           |-------------------------------------------------------|
|           | EBADDR                                                |
|  .EBFL2   |              Storage Address (from SPTH)              |
|           |-------------------------------------------------------|
|           | EBGRP                     | EBHASH                    |
|  .EBGHV   |       Group number        | Hash value for Lock-Block |
|           |-------------------------------------------------------|
|           | EBMBWS                    | EBTSWS                    |
|  .EBWCT   | # of words in Mask Block  | # of words in Text String |
|           |-------------------------------------------------------|
|  .EBSMB   \                                                       \ /|\
|           \                      Mask Block                       \ 15
|           \                                                       \ Words
|           |-------------------------------------------------------| \|/
|           \                                                       \ /|\
|           \                     ASCIZ String                      \ 50
|           \                          or                           \ Words
|           \                 500000,,0 + User Code                 \  |
|           \                                                       \ \|/




                                    454
                               MONITOR TABLES
|                               VRQA (Cont.)


|           |-------------------------------------------------------| /|\
|           \                                                       \ 3
|           \                 Additional Data Area                  \ Words
|           \                                                       \ \|/
|           +-------------------------------------------------------+
|  
|  
|           |-------------------------------------------------------|
|           | EBFLAG          | EBCFSC  | EBUNIQ                    |
|  .EBFFW   |      Flags      |Function |Unique code for message set|
|           |-------------------------------------------------------|
|  
|            Contents of EBFLAG:
|  
|            Symbol    Bits  Meaning
|  
|            EQNOV      0    No vote required for this lock
|            EQNO       1    A "NO" reply was received from another node
|            EQANS      2    This is a reply to a vote request
|            EQBLN      3    Ignore level numbers for this vote
|            EQTXT      4    The lock is described by a text string
|  
|  
|           +-------------------------------------------------------+
|           \                                                       \
|           \                                                       \
|           \              Assorted Reserved Locations              \
|           \                                                       \
|           \                                                       \
|           |-------------------------------------------------------|
|  
|  
|            Contents of Port and SCA Header Section of VRQA:
|  
|            Symbol    Location Meaning
|  
|            VOTUNI     VRQA+0 Vote Unique Code
|            VOTVCT     VRQA+1 The count of outstanding replies
|            VRBADR     VRQA+2 The address of the vote reply buffer
|            ASMPTR     VRQA+3 Offset into VRQA used by EQMSG
|            RPLYND     VRQA+4 CFS host index to send reply to
|            EQLBLT     VRQA+5 Lock-Block Action List
|            EQLBCT     VRQA+6 Count of blocks on action list
|            EQCSTF     VRQA+7 Cluster state change flag








                                    455
                               MONITOR TABLES


                                    WS

   WS defines the format for the NI Write Station Info command.

   Defined in:  PHYKNI

                                            Format                                  

          +------------------------------------------------------------------------+ 
   WSHAD  |                      High order ethernet address                       |   
          |------------------------------------------------------------------------| 
   WSLAD  |                       Low order ethernet address                       |   
          |------------------------------------------------------------------------| 
          |                                                               | | | |  |
          |                                                               | WSVAR  |*
          |------------------------------------------------------------------------| 
          |                                               |         WSRTY          |
          |                                               |   Error retry value    |
          |------------------------------------------------------------------------| 
          |               WSFNC               |                                    |
          |Function which invoked this command|                                    |
          +------------------------------------------------------------------------+ 

           For field WSVAR(32-35):
                   WSCRC      32   Allow receipt of frames with CRC errors
                   WSPMC      33   Promiscious multicast mode
                   WSH40      34   H4000 mode
                   WSPRM      35   Promiscious mode

























                                    456
                               MONITOR TABLES


                                    XR

   The XR structure defines the format of the queue header for NI  portal
   block transmit and receive queues (see NI Portal Block -- PR).

   Defined in:  NIUSR

                                            Format                                  

                                         Queue headers                              
          +------------------------------------------------------------------------+ 
   XRQUH  |                          Pointer to first item                         |        
          |------------------------------------------------------------------------| 
   XRQUE  |                          Pointer to last item                          |        
          +------------------------------------------------------------------------+ 






































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                                 APPENDIX A

                         LISTING BY MONITOR MODULES




   This appendix lists the TOPS-20 modules and the monitor tables defined
   in each.

   Defined in               Table Title

|  APRSRV                   SCHED-Variables
|  
|  CFSPAR                   CFS Resource Block
|  
|  CFSSRV                   CFS Voter Message Buffer
|  
|  CLULSN                   CLUHST
|                           CLUSTS
|  
|  CLUPAR                   CLUDGR Message Buffer
|  
|  CSTnX                    CSTnX
|  
|  CTERMD                   CA
|                           CH-CTERMD
|  
|  D36COM                   CH-D36COM
|                           FB
|  
|  D36PAR                   AA
|                           AJ
|                           BP
|                           CT
|                           DL
|                           EC
|                           EL


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                         LISTING BY MONITOR MODULES
                                        


|                           ES
|                           ET
|                           FA
|                           IA
|                           IB
|                           KB
|                           LI
|                           MB
|                           MD-D36PAR
|                           NE
|                           NF
|                           NM
|                           NX
|                           OA
|                           PA
|                           QA
|                           QH-D36PAR
|                           QP
|                           RC-D36PAR
|                           RM
|                           SA
|                           SJ
|                           SL
|                           SS
|                           TR
|                           UD
|                           VN
|  
|  DNADLL                   LT
|                           QB
|  
|  DSKALC                   HOM
|  
|  ENQPAR                   ENQ/DEQ-LOCK-BLOCK
|                           Q-BLOCK
|  
|  ENQSRV                   VANA
|                           VRB
|                           VRPA
|                           VRQA
|  
|  FREE                     FREESPACE BLOCK HEADER/TRAILER
|                           FREESPACE DESCRIPTOR
|                           FREESPACE-DESCRIPTOR INDEX TABLE
|                           FREESPACE HISTORY RECORD
|  
|  IPCF                     IPCF-MESSAGE-HEADER
|                           IPCF-PID-HEADER
|  
|  IPCIDV                   PT-IPCIDV                                    


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                         LISTING BY MONITOR MODULES
                                        


|  LATSRV                   AC
|                           CB-LATSRV
|                           CC-LATSRV
|                           GB
|                           HC
|                           HN
|                           QL
|                           SB-LATSRV
|                           UE                                    
|  
|  LLINKS                   AK
|                           LK
|                           LS
|                           NN
|                           RT
|                           SG-LLINKS
|                           SV-LLINKS
|  
|  LLMOP                    CB-LLMOP
|                           CD
|                           CH-LLMOP
|                           IM
|                           LB
|                           LD
|                           LH
|                           RB
|                           RI
|                           SV-LLMOP                                    
|  
|  LOGNAM                   LOGICAL-NAME-DEFINITION
|  
|  MONSYM                   DEVCH1
|                           FDB
|                           INIDVT
|  
|  NIPAR                    CC-NIPAR
|                           MD-NIPAR
|                           PC
|                           UN                                    
|  
|  NISRV                    PR-NISRV                                    
|  
|  NIUSR                    BR
|                           PI
|                           PL
|                           PR-NIUSR
|                           XR
|  
|  NRTSRV                   NR                                    



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                         LISTING BY MONITOR MODULES
                                        


|  NTMAN                    DNA Parameter and Counter Data Base
|                           NT
|                           PRMP
|  
|  PHYKLP                   RIDSTS (Request-ID Status)
|  
|  PHYKNI                   BD
|                           C1
|                           CM
|                           FL
|                           MT
|                           PB-PHYKNI
|                           PS-PHYKNI
|                           PT-PHYKNI
|                           QE
|                           QH-PHYKNI
|                           RC-PHYKNI
|                           RD
|                           RS
|                           SB-PHYKNI
|                           SN
|                           WS                                    
|  
|  PHYM2                    KDB
|  
|  PHYMSC                   CICMST
|                           CIDATA
|                           MSCCID
|                           MSCINT
|                           MSCOLD
|                           MSCTMO
|  
|  PHYMVR                   MSCP Server Command Header
|                           MSCP SERVER STORAGE
|                           SCDB
|  
|  PHYP2                    KDB
|  
|  PHYPAR                   CDB
|                           CDBCAD
|                           CDS
|                           IORB
|                           KDB
|                           UDB
|                           UDS
|  
|  PHYSIO                   DSKSIZ
|                           DSKUTP
|                           NAMUTP



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                         LISTING BY MONITOR MODULES
                                        


|  PROLOG                   BAT
|                           DEV`DTB
|                           DIRECTORY
|                           DIRECTORY CACHE
|                           DST
|                           FDB
|                           FKCNO
|                           FKSWP
|                           IDXFIL
|                           JOBRTL
|                           SPT
|                           SPTD
|                           SPTH
|                           SPTO
|                           SPTO2
|                           USER-PG-MAP-TBL
|  
|  SCAMPI                   CI Related Variables
|                           SBLIST (System Block List)
|  
|  SCAPAR                   Connect ID Format
|                           KDB
|                           PCB (Port Control Block)
|                           SCA Connection Block
|                           SCA Ring Buffer Entry
|                           System Block
|  
|  SCHED                    SCHED-VARIABLES
|  
|  SCLINK                   BU
|                           CF
|                           LN
|                           NO-SCLINK                                    
|  
|  SCPAR                    CB-SCPAR
|                           MN
|                           NO-SCPAR
|                           PB-SCPAR
|                           PS-SCPAR
|                           PT-SCPAR
|                           SB-SCPAR
|                           ST
|  
|  SERCOD                   SYSERR-STORAGE-AREA
|  
|  STG                      ALOC1
|                           ALOC2
|                           BTB
|                           BUG-HLT/CHK/INF-STORAGE-AREA
|                           CDBCAD


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                         LISTING BY MONITOR MODULES
                                        


|                           CDR-STORAGE-AREA
|                           CFHSHT
|                           CFHSTS
|                           CFNNAM
|                           CFSHNM
|                           CFSHST
|                           CFSOFN
|                           CFS Resource Block
|                           CFSSTR
|                           CHNTAB
|                           CLASS-SCHEDULER-STORAGE
|                           CST0
|                           CST1
|                           CST2
|                           CST3
|                           CST5
|                           DEVCH1
|                           DEVCH2
|                           DEVCHR
|                           DEVDSP
|                           DEVNAM
|                           DEVUNT
|                           DIRECTORY CACHE
|                           DRMBBT
|                           DRMCNT
|                           DSKSZ`n
|                           DST
|                           DTE-STORAGE-AREA
|                           DTEDTV
|                           ENQ/DEQ - STORAGE AREA
|                           EPT
|                           EXEC-PG-MAP-TBL
|                           FE-STORAGE-AREA
|                           FKBSPW
|                           FKCNO
|                           FKINT
|                           FKINTB
|                           FKJOB
|                           FKJTQ
|                           FKNBW
|                           FKNR
|                           FKPGS
|                           FKPGST
|                           FKPT
|                           FKQ1
|                           FKQ2
|                           FKSTA2
|                           FKSTAT
|                           FKSWP
|                           FKTIME


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