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PDP-10 Archives
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decus_20tap2_198111
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decus/20-0027/memory.mac
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00100 TITLE MEMORY EXTENSION CONTROL VERSION #2 SEPT. 1 '69
00200 SUBTTL DON WITCRAFT 1-22-66
00300
00400
00500 ;MEMORY EXTENSION REGISTERS
00600
00700 INTERNAL IF,IBR,DFF,IFSW,DFSW,IFSAVE,DFSAVE
00800
00900 ;MEMORY EXTENSION CONTROL
01000
01100 IFSW: 0 ;INSTRUCTION FIELD SWITCHES
01200 IF: 0 ;INSTRUCTION FIELD REGISTER
01300 IFSAVE: 0 ;SAVE FIELD REGISTER BITS 0-2,IF
01400 IBR: 0 ;INSTRUCTION BUFFER REGISTER
01500 DFSW: 0 ;DATA FIELD SWITCHES
01600 DFF: 0 ;DATA FIELD REGISTER
01700 DFSAVE: 0 ;SAVE FIELD REGISTER BITS 3-5,DFF
01800
01900 ;MEMORY EXTENSION IOTS
02000
02100 INTERNAL CDF,CIF,RDF,RIF,RIB,RMF
02200
02300
02400 CDF: SUBI RUNTIM,3
02500 ANDI MB,70 ;CHANGE TO DATA FIELD N
02600 LSH MB,^D9 ;MB6-8=>DFF
02700 MOVEM MB,DFF
02800 POPJ PDP,
02900
03000 CIF: SUBI RUNTIM,3
03100 ANDI MB,70 ;CHANGE INSTRUCTION FIELD
03200 LSH MB,^D9 ;MB6-8=>IB
03300 MOVEM MB,IBR
03400 POPJ PDP,
03500
03600 RDF: SUBI RUNTIM,3
03700 ANDI AC,7 ;READ DATA FIELD
03800 MOVE AC0,DFF
03900 LSH AC0,-14 ;DFF=>AC6-8
04000 OR AC,AC0
04100 POPJ PDP,
04200
04300 RIF: SUBI RUNTIM,3
04400 ANDI AC,70 ;READ INSTRUCTION FIELD
04500 MOVE AC0,IF ;IF=>AC6-8
04600 LSH AC0,-11
04700 OR AC,AC0
04800 POPJ PDP,
04900
05000 RIB: SUBI RUNTIM,3
05100 ANDI AC,77 ;READ INTERRUPT BUFFER
05200 MOVE AC0,IFSAVE ;SF0-2=>AC6-8
05300 LSH AC0,-11
05400 OR AC,AC0
05500 MOVE AC0,DFSAVE ;SF3-5=>AC9-11
05600 LSH AC0,-14
05700 OR AC,AC0
05800 POPJ PDP,
05900
06000 RMF: SUBI RUNTIM,3
06100 MOVE AC0,IFSAVE ;RESTORE MEMORY FIELD
06200 MOVEM AC0,IBR ;SF0-2=>IB
06300 MOVE AC0,DFSAVE ;SF3-5=>DFF
06400 MOVEM AC0,DFF
06500 POPJ PDP,
06600 END