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BB-JR93N-BB_1990
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10,7/unsmon/fsxkon.mac
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TITLE FSXKON - RS04 (FAST SWAPPING DISK) DRIVER V064
SUBTTL T WACHS/TW/JBS 17 APRIL 90
SEARCH F,S,DEVPRM,SAXPRM
$RELOC
$HIGH
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED
; OR COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
;COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION
; 1973,1974,1975,1976,1977,1978,1979,1980,1982,1984,1986,1988,1990.
;ALL RIGHTS RESERVED.
.CPYRT<1973,1990>
XP VFXKON,064
FSXKON::ENTRY FSXKON
SUBTTL AUTOCONFIGURATION TABLES
FSFIX==400000 ;BIT 0=1 SINCE FIXED HEAD DISK
FSOFS==400000 ;NO OFFSET CAPABILITY
FSRDC==400000 ;NO 10/11 COMPATABILITY MODE
FSUNL==400000 ;NO UNLOAD CAPABILITY
FSCPY==0 ;CAN TELL UNIT TYPE EVEN IF KONTROL IS BUSY
FSMX==0 ;CANNOT DO MULTI TRANSFERS
FSDRB==0 ;DOESN'T USE DISK I/O REQUEST BLOCKS
FSBMX==0 ;NOT A BLOCK MULTIPLEX KONTROLLER
FSECA==0 ;TRY OFFSET/RECAL BEFORE TRYING ECC
FSERNO==^D8 ;8 DRIVE REGISTERS TO SAVE ON ERROR
FSXELG==MDEELG## ;ERROR LOG ROUTINE IS IN FILIO
FSXDMX==10 ;MAXIMUM DRIVES PER KONTROLLER
FSXHDN==FSXDMX-1 ;HIGHEST DRIVE NUMBER ON KONTROLLER
;DRIVER CHARACTERISTICS
; FSX = FSXCNF
; DSK = DISK
; 0 = MAXIMUM DEVICES IN SYSTEM (NO LIMIT)
; TYPFS = KONTROLLER TYPE
; FSXDMX = MAXIMUM DRIVES PER KONTROLLER
; FSXHDN = HIGHEST DRIVE NUMBER ON KONTROLLER
; MDSEC0 = SECTION FOR KDB/UDB
; MDSEC0 = SECTION FOR DDB
DRVCHR (FSX,DSK,0,TYPFS,FSXDMX,FSXHDN,MDSEC0,MDSEC0,DR.MCD)
.ORG KONUDB ;START OF RS04/RS05 SPECIFIC DATA
FSXUTB:!BLOCK FSXDMX ;TABLE OF POINTERS TO UDBS
FSXEBK:!BLOCK FSERNO ;STORAGE FOR ERROR REGISTERS
FSXIOB:! ;START OF SPECIAL I/O INSTRUCTIONS
FSXCO4:!BLOCK 1
FSXCI2:!BLOCK 1
FSXCO2:!BLOCK 1
FSXDI3:!BLOCK 1
FSXDO3:!BLOCK 1
FSXDO4:!BLOCK 1
FSXIOE:!
FSXFNC:!BLOCK 1 ;CURRENT FUNCTION AND FLAGS
FSXIUM:! BLOCK FSXDMW ;IGNORE DRIVE MASK
FSXNUM:! BLOCK FSXDMW ;NEW DRIVE MASK
FSXKLN:! ;LENGTH OF KDB
.ORG
;PROTOTYPE KDB
FSXKDB: XXKON (FS)
SETWRD (FSXCO4,<CONO 000,(T4)>)
SETWRD (FSXCI2,<CONI 000,T2>)
SETWRD (FSXCO2,<CONO 000,(T2)>)
SETWRD (FSXDI3,<DATAI 000,T3>)
SETWRD (FSXDO3,<DATAO 000,T3>)
SETWRD (FSXDO4,<DATAO 000,T4>)
KDBEND
EQUATE (LOCAL,0,<FSXULP,FSXULB>)
EQUATE (LOCAL,CPOPJ##,<FSXALV,FSXCCM,FSXEDL,FSXHWP,FSXINI,FSXRLD>)
FSXICD==DSKICD## ;PROTOTYPE INTERRUPT CODE
FSXICL==DSKICL##
FSXUDB==0 ;NO PROTOTYPE UDB
FSXULN==UNIEBK+FSERNO ;LENGTH OF UDB
FSXDSP: DRVDSP (FSX,DSKCHN##,DSKDDB##,DDBLEN##,DSKDIA##)
;DEFAULT MONGEN'ED DEVICE TABLE
DEFMDT: MDKL10 (7,270,0,0,<MD.KON>) ;RH10 DEVICE CODE 270
MDKL10 (7,274,0,0,<MD.KON>) ;RH10 DEVICE CODE 274
MDKL10 (7,360,0,0,<MD.KON>) ;RH10 DEVICE CODE 360
MDTERM ;TERMINATE TABLE
FSXCKT: EXP 0 ;COMPATIBLE KONTROLLER TABLE
SUBTTL DEFINITIONS
;INTERESTING DEFINITIONS:
;DATAO'S
LR==4000 ;LOAD REGISTER
DODA==050000 ;DESIRED ADDRESS
DOLA==070000 ;LOOK-AHEAD REGISTER (SECTOR COUNTER)
DOCR==400000 ;CONTROL REGISTER
DOER==020000 ;ERROR REGISTER
DODB==500000 ;DATA BUFFER REGISTER
DORA==540000 ;REGISTER ACCESS ERROR
;DATAI BITS
DIERRS==003600
CBTO==2000 ;CONTROL BUS TIME OUT
DCK==100000 ;DATA CHECK BIT IN ERROR REGISTER
;CONI/CONO BITS
CHNPAR==6 ;(LH) CHAN-DETECTED PARITY ERR
CHNNXM==1 ;(LH) CHAN-DETECTED NXM
CHANER==120000 ;CHAN ERR OR OVERRUN
OVERUN==20000
ALLERR==736360 ;ALL CONI ERR BITS (RH)
ILC==4000 ;ILLEGAL COMMAND (ILFNC OR SDRAE)
DRVERR==600,,436300 ;DRIVE OR CONTROLLER ERROR
DONBIT==10 ;DONE
STPBIT==20 ;STOP THE UNIT BIT (CONO)
BSYBIT==20 ;BUSY
ILFC==400 ;ILLEGAL FUNCTION
SDRAE==200 ;SELECTED DRIVE REG ACCESS ERROR (LH)
CI.PWF==2000 ;CONI FOR POWERFAIL
CO.MBI==2000 ;CONO FOR POWERFAIL
FSALCL==734200 ;CLEAR ALL ERRORS
;DATAO BITS
DXES==200000 ;DISABLE STOP ON ERROR
FNCCLR==11 ;DRIVE CLEAR
FNCRED==71
FNCWRT==61
DEFINE STALL,<
XLIST
IFN FTKL10,<
IMULI P,1
IMULI P,1
>
LIST
>
FSXRDF:
FSXRDC:
FSXRED: SKIPA T1,[FNCRED] ;READ
FSXWTF:
FSXWTC:
FSXWRT: MOVEI T1,FNCWRT ;WRITE
TRO T1,DXES ;DISABLE STOP ON ERR
JRST FSXGO
FSXRDS: SKIPA T1,[FNCRED] ;READ
FSXWTS: MOVEI T1,FNCWRT ;WRITE
FSXGO: XCT FSXCI2(J) ;CONI FSN,T2
TLNN T2,ILFC
TRNE T2,ALLERR-ILC ;ANY ERROR (INCLUDING BUSY)?
JRST NOSTR2 ;YES, YOU LOSE
TLNN T2,SDRAE ;REG ACCESS ERR?
JRST FSXGO1 ;NO
MOVE T3,UDBPDN(U) ;PHYSICAL DRIVE NUMBER
MOVEI T4,1 ;POSITION A BIT FOR CONTROLLER DATAO
LSH T4,(T3)
MOVSI T3,LR(T3) ;SELECT DRIVE CNTRL REG
HRRI T3,FNCCLR ;CLEAR THE DRIVE
XCT FSXDO3(J) ;ZAP!
MOVSI T3,DORA+LR ;SET TO CLEAR RAE IN CONTROLLER
HRR T3,T4 ;WHICH BIT
XCT FSXDO3(J) ;ZAP
FSXGO1: MOVE T2,UDBPDN(U) ;GET PHYSICAL DRIVE NUMBER
MOVE T3,UNIBLK(U) ;DESIRED BLOCK
LSH T3,1 ;*2=SECTOR
HRLI T3,DODA+LR(T2) ;SET TO DATAO DESIRED ADDRESS
XCT FSXDO3(J) ;SET DESIRED BLOCK
STALL
XCT FSXDI3(J) ;READ STATUS
TLNE T3,DIERRS ;DRIVE OK?
JRST NOSTRT ;NO, YOU LOSE
MOVE T3,KDBICP(J) ;YES, GET ICWA
LSH T3,6 ;POSITION IT
TRO T3,(T1) ;+ FUNCTION
HRLI T3,DOCR+LR(T2) ;DATAO CONTROL REGISTER
MOVEM T3,FSXFNC(J) ;SAVE FUNCTION
MOVEM T3,UNILAS(U) ;SAVE LAST DATAO TO THE DRIVE
XCT FSXDO3(J) ;START DRIVE GOING
MOVEI T4,DSKCHN## ;SET PI IN RH10
XCT FSXCO4(J) ;CONO FSN,(T4)
PJRST CPOPJ1## ;AND TAKE SKIP-RETURN
;HERE IF DRIVE ISN'T READY
NOSTRT: TLNN T3,CBTO ;DRIVE THERE?
NOSTR2: TDZA T1,T1 ;YES
MOVEI T1,KOPOFL ;NO
MOVSI T3,DOCR ;CNTRL REGISTER DATAI BITS
XCT FSXDO3(J) ; RETURNED IN T3 ON UNIT NOT READY
STALL
XCT FSXDI3(J)
XCT FSXCI2(J) ;CONI BITS IN T2
POPJ P, ;NON-SKIP RETURN
FSXREG: PUSH P,U ;RDREG WIPES U
PUSHJ P,RDREG ;READ ALL DRIVE REGS
PJRST UPOPJ## ;RESTORE U AND RETURN
FSXPOS: STOPCD CPOPJ1##,DEBUG,RDP, ;++RS04 DOESNT POSITION
FSXUNL:
FSXERR:
FSXECC: STOPCD CPOPJ1##,DEBUG,RS04IF, ;++RS04 ISNT FANCY
FSXRCL: POPJ P, ;NO RECAL
FSXLTM: MOVE T2,UDBPDN(U) ;PHYSICAL DRIVE NUMBER
MOVSI T3,DOLA+LR(T2) ;DATAO LOOK-AHEAD REGISTER
XCT FSXDO3(J)
STALL
XCT FSXDI3(J) ;READ STATUS
TLNE T3,DIERRS ;DRIVE OK?
POPJ P, ;NO, NON-SKIP
LDB T2,[POINT 6,T3,29] ;YES, GET SECTOR COUNTER
LSH T1,1 ;CONVERT TO BLOCK NUMBER
ANDI T1,77 ;STRIP NON-SECTOR STUFF FROM DESIRED BLOCK
SUBI T1,3(T2) ;FUDGE-FACTOR = 3 SECTORS
SKIPGE T1
ADDI T1,^D64 ;ADD 1 REVOLUTION IF NEGATIVE
IMULI T1,^D240 ;PER 64-WORD SECTOR
;IF WE WANT TO GET FANCY,
; CAN ADD THE WORD-TIMES IN TOO
; BUT ITS PROBABLY A BAD IDEA SINCE WILL
; NEVER EXACTLY GET A 0 TIME
; ADD T1,T3
PJRST CPOPJ1## ;TAKE GOOD RETURN
;HERE TO TRY AND STOP THE UNIT
FSXSTP: MOVE T3,UDBPDN(U) ;PHYSICAL DRIVE NUMBER
MOVSI T3,DOER(T3) ;SET TO READ ERROR REG
XCT FSXDO3(J) ;DATAO ERROR REGISTER
STALL
XCT FSXDI3(J) ;(BEFORE) ERROR STATUS
XCT FSXCI2(J) ;(BEFORE) CONI STATUS
PUSH P,T2 ;SAVE CONI STATUS
MOVEI T2,STPBIT ;TRY TO STOP DRIVE
XCT FSXCO2(J) ;ZAP
XCT FSXCI2(J)
TRNN T2,BSYBIT ;DID IT STOP?
AOS -1(P) ;YES, SKIP-RETURN
PJRST T2POPJ## ;RESTORE CONI STATUS AND RETURN
;HERE ON AN INTERRUPT
FSXINT: MOVE W,J ;SET UP KDB ADDRESS
PUSHJ P,SVMBR## ;SAVE CURRENT MBR FOR UUO LEVEL
XCT FSXCI2(J) ;READ STATUS
MOVSI T3,DOCR ;SET TO DATAO CONTROL REG
XCT FSXDO3(J)
STALL
XCT FSXDI3(J) ;READ CNTRL REG
MOVE T4,T3 ;SAVE IT
TLO T3,LR
XCT FSXCI2(J) ;CONI FH'N,T2
MOVEI T1,0
CAME T3,FSXFNC(J) ;RIGHT DATA IN CNTRL REG?
TRO T1,IODERR ;OOPS!
ANDI T3,77 ;GET FUNCTION
CAIN T3,FNCWRT ;WRITE?
TRO T1,OPWRT ;YES (OPRED=0)
MOVE T3,FSXFNC(J) ;FUNCTION AGAIN
HLL T1,T3 ;UNIT TO T1
TLZ T1,777770 ;NO ATTENTIONS
TRNN T2,ALLERR ;ERROR?
JRST DISMIS ;NO
TDNE T2,[EXP DRVERR] ;YES, DRIVE/CONTROLLER ERROR?
TRO T1,IODERR ;YES
TRNN T2,CHANER ;CHAN ERR?
JRST DISMIS ;NO
TRNE T2,OVERUN ;YES, OVERRUN?
TRO T1,IOVRUN+IODERR ;YES
TLNE T2,CHNPAR ;CHAN ERR OR OVERRUN
TRO T1,IOCHMP+IODERR ;CORE PARITY ERROR
TLNE T2,CHNNXM
TRO T1,IOCHMP+IODERR ;MEMORY PARITY ERROR
DISMIS: MOVE U,KONCUA(J) ;UNITDB
MOVE T3,UDBPDN(U) ;PHYSICAL DRIVE NUMBER
MOVSI T3,DOER(T3)
XCT FSXDO3(J) ;READ IT
STALL
XCT FSXDI3(J)
TRNE T3,DCK ;DATA CHECK?
TRO T1,IODTER ;YES, LIGHT A BIT
HRL T3,T4 ;RETURN CNTRL REG,,ERROR REG DATAI'S
TRNE T1,IODERR!IODTER ;ERROR?
PUSHJ P,RDREG
TRNN T2,CI.PWF ;POWERFAIL BIT LIT ?
JRST FINSH1 ;NO, CONTINUE
MOVEI T4,CO.MBI ;YES, SETUP T4 FOR MASSBUS INIT
XCT FSXCO4(J) ;DO THE INIT
FINSH1: MOVEI T4,FSALCL+DONBIT-ILC ;CLEAR ALL ERRORS AND DONE (LEAVE SDRAE)
XCT FSXCO4(J)
MOVE T4,UDBPDN(U) ;PHYSICAL DRIVE NUMBER
MOVSI T4,LR(T4) ;SET TO CLEAR THE DRIVE
HRRI T4,FNCCLR
XCT FSXDO4(J) ;ZAP
PJRST FILINT## ;GO TELL FILSER
RDREG: PUSH P,F
PUSH P,T3
MOVE T4,UDBPDN(U) ;PHYSICAL DRIVE NUMBER
MOVE U,KONREG(J)
MOVEI F,FSXEBK(J) ; AND SAVE IN KONTROLLER DB
ADDI F,-1(U)
ERRSUM: MOVSI T3,-1(U)
LSH T3,^D12 ;REGISTER NUMBER
TLO T3,(T4) ;DRIVE NO
XCT FSXDO3(J)
STALL
XCT FSXDI3(J) ;READ THE REGISTER
MOVEM T3,(F) ;SAVE
SUBI F,1
SOJG U,ERRSUM ;AND READ THE NEXT
MOVSI T3,DOCR ;READ RH10 CONTROL REG
XCT FSXDO3(J)
XCT FSXDI3(J)
MOVEM T3,KONECR(J) ; AND STORE IN KDB
MOVSI T3,DODB ;READ DATA BUFFER
XCT FSXDO3(J)
XCT FSXDI3(J)
MOVEM T3,KONEDB(J) ; AND STORE IN KDB
POP P,T3 ;RESTORE T3
MOVE U,KONCUA(J) ;RESTORE U
JRST FPOPJ##
;HERE TO CHECK CAPACITY & STATUS OF RH10/RS04, RS05
FSXCPY: MOVE T3,UDBPDN(U) ;PHYSICAL DRIVE NUMBER
MOVSI T3,060000(T3) ;SET TO DATAO DRIVE-TYPE REGISTER
XCT FSXDO3(J)
STALL
XCT FSXDI3(J) ;READ DRIVE TYPE (& STATUS)
TLNE T3,2000 ;CONTROL BUS TIMEOUT?
JRST FSXCP1 ;YES, THE UNIT ISNT THERE
ANDI T3,TR.TYP ;GET UNIT TYPE
CAIE T3,TY.RS4
CAIN T3,TY.RS5 ;SOME FLAVOR OF RS04?
TDZA T4,T4 ;YES, OK. UNIT TYPE = RS04
;(NO DISTINCTION BETWEEN RS04 AND RS05)
JRST FSXCP1 ;NO, PRETEND ITS DOWN
MOVEI T1,^D2048 ;BLOCKS PER UNIT
MOVE T2,T1 ;BLOCKS PER CYLINDER
SETZ T3, ;NO COMPATABILITY MODE
MOVE W,[^D32,,^D2048] ;BLKS PER TRK,,BLKS PER CYL
PJRST CPOPJ1## ;TAKE GOOD RETURN
;HERE ON CONTROL BUS TIMEOUT
FSXCP1: MOVSI T4,KOPUHE ;OFF LINE OR DOWN
TLO T4,KOPNSU ;NO SUCH UNIT
POPJ P,
$INIT
;CHECK FOR KONTROLLER UP
FSXUPA: MOVEI T4,FSALCL+DSKCHN## ;CLEAR ALL ERROR BITS
XCT FSXCO4(J) ;CONO FSX,(T4)
XCT FSXCI2(J) ;CONI FSX,T2
TRNN T2,2030 ;PS FAIL, BUSY OR DONE UP?
TRNN T2,7 ;NO, PI UP?
POPJ P, ;DOWN
PJSP T1,CPOPJ1## ;UP, SET T1 NON-0 (WH LOCKOUT), AND RETURN
$HIGH
SUBTTL AUTOCONFIGURATION
;ENTERED WITH DEVICE CODE/4 IN T1, AND CONI DEV, IN T2
FSXCFG: TLNE T2,(SI.SAX!CI.PPT) ;WEED OUT SA10 OR IPA CHANNEL
JRST CPOPJ1## ;SORRY, I'M NOT INTERESTED
XMOVEI T1,FSXMDT## ;MONGEN'ED DEVICE TABLE
XMOVEI T2,DEFMDT ;DEFAULT TABLE
MOVSI T3,-1 ;MATCH ON ANY MASSBUS UNIT
MOVEI T4,MD.KON ;MATCH ON KONTROLLER DEFINITION
PUSHJ P,AUTMDT## ;SCAN THE TABLES
JRST CPOPJ1## ;NO MATCHES
XCT .CPCNI## ;GET CONI ,T1
TLNN T1,4000 ;CHECK FOR DF10 OR DF10C IN 18-BIT MODE
JRST AUTEBD## ;18-BIT DF10/DF10C, INFORM OF ERROR AND RETURN
MOVSI T1,0 ;GET CHANNEL TYPE BITS FOR RH10
PUSHJ P,AUTCHN## ;BUILD A CHANNEL DATA BLOCK
POPJ P, ;NO CORE
PUSHJ P,SAVE1## ;FREE UP P1
SETZB J,P1 ;NO KDB YET, START WITH MASSBUS UNIT 0
FSXCF1: PUSHJ P,FSXUNI ;CONFIGURE A SINGLE UNIT
JFCL ;IGNORE ERRORS
AOBJN P1,.+1 ;ADVANCE TO NEXT UNIT
HLLZS P1 ;KEEP JUST MASSBUS UNIT NUMBER
TLNN P1,10 ;DONE THEM ALL?
JRST FSXCF1 ;NO, DO ANOTHER
POPJ P, ;ALL DONE
;HERE TO CONFIGURE A SINGLE NEW UNIT
FSXUNI: JUMPE J,FSXUN1 ;SKIP TEST IF NO KDB YET
HLRZ T1,P1 ;GET UNIT
MOVE T1,BITTBL##(T1) ;AND IT'S BIT
TDNE T1,FSXIUM(J) ;WANT TO IGNORE THIS DRIVE?
POPJ P, ;SAY IT DOESN'T EXIST
FSXUN1: MOVE W,J ;AUTCON WANTS W SET UP
PUSHJ P,RDDTR## ;READ DRIVE TYPE REGISTER
CAIE T2,TY.RS4 ;SOME TYPE OF RS04?
CAIN T2,TY.RS5
TDZA T2,T2 ;YES, NO DISTINCTION BETWEEN RS04 AND RS05
JRST FSXUN3 ;UNKNOWN UNIT TYPE
TLO T2,(1B0) ;INDICATE IT'S A NON-REMOVABLE MEDIA DRIVE
HLLZ T1,P1 ;COPY UNIT NUMBER
HLRS T1 ;ALSO USE AS UDB TABLE OFFSET
JUMPN J,FSXUN2 ;IF WE ALREADY HAVE A KDB, PROCEED
PUSH P,T1 ;SAVE THE USEFUL ACS
PUSH P,T2
MOVNI T1,1 ;NO MASSBUS UNIT NUMBER
MOVEI T2,TYPFS ;KONTROLLER TYPE CODE
PUSHJ P,DSKKON## ;BUILD A KONTROLLER DATA BLOCK
JRST TTPOPJ## ;NO CORE
MOVSI T1,-<FSXIOE-FSXIOB> ;NUMBER OF WORDS TO CHECK
XMOVEI T2,FSXIOB(J) ;STARTING WORD
HRRZ T3,.CPDVC## ;<DEVICE CODE>/4
PUSHJ P,AUTDVC## ;SET DEVICE CODES
;*** NEED SYMBOL - CBOV, RAE, ATTN, DONE
MOVEI T1,350 ;GET INTERRUPT FLAGS FOR RH10
MOVE T2,KDBCSO(J) ;GET ADDRESS OF CONSO SKIP CHAIN
HRRM T1,DICDIF##(T2) ;SET CORRECT INTERRUPT FLAGS
POP P,T2 ;RESTORE THE ACS
POP P,T1
FSXUN2: PUSHJ P,DSKDRV## ;BUILD AND LINK THE UDB
JRST FSXUN3 ;NO CORE
MOVSI T2,(.DISNR) ;READ SERIAL NUMBER REGISTER
PUSHJ P,RDMBR##
SETZ T1, ;REALLY A ONE-WORD QUANTITY
MOVE T3,UDBPDN(U) ;GET PHYSICAL DRIVE NUMBER
PUSHJ P,AUTDSN## ;FAKE UP S/N IF A ZERO
DMOVEM T1,UDBDSN(U) ;SET SERIAL NUMBER IN UDB
JRST CPOPJ1## ;RETURN
FSXUN3: SETZ U, ;INDICATE NO UDB
POPJ P, ;RETURN
;ONCE A SECOND CODE
FSXSEC: SKIPL @KDBCHN(J) ;CHANNEL BUSY?
POPJ P, ;LEAVE IT ALONE
SKIPE T1,FSXNUM(J) ;GET BIT MASK
JFFO T1,FSXSE1 ;FIND FIRST UNIT NUMBER
HRRZS KDBNUM(J) ;INDICATE NO DRIVES TO CONFIGURE
POPJ P, ;DONE
FSXSE1: PUSHJ P,AUTLOK## ;GET AUTCON INTERLOCK
POPJ P, ;TRY AGAIN NEXT TIME
PUSHJ P,SAVW## ;PRESERVE W
MOVE W,J ;COPY KDB ADDRESS TO W FOR AUTCON
MOVSS T2 ;MASSBUS UNIT = DRIVE NUMBER FOR FSX DISKS
PUSH P,T2 ;SAVE
MOVE T1,KDBDVC(J) ;DEVICE CODE
XMOVEI T2,FSXDSP ;DISPATCH
MOVE T3,KDBCHN(J) ;CHANNEL DATA BLOCK
PUSHJ P,AUTSET## ;SET UP CPU VARIABLES
EXCH P1,(P) ;SAVE P1, GET MASSBUS UNIT
PUSH P,KDBUNI(J) ;SAVE KDBUNI
MOVEM P1,KDBUNI(J) ;SET FOR THIS MASSBUS UNIT NUMBER (FOR RDMBR)
PUSHJ P,FSXUNI ;CONFIGURE A NEW UNIT
JFCL ;IGNORE ERRORS
PUSHJ P,AUTULK## ;RELEASE AUTCON INTERLOCK
POP P,KDBUNI(J) ;RESTORE KDBUNI
PJRST P1POPJ## ;RESTORE P1 AND RETURN
END