swh:1:snp:92f3f585b9ae79620ad8c41a332d6329b31fd381
Tip revision: 078c79d8734a9ed2860303a7c1662004284fe853 authored by Ron Burkey on 07 August 2022, 15:04:04 UTC
Fixed a potential string-overflow bug in yaASM. Removed timestamps from
Fixed a potential string-overflow bug in yaASM. Removed timestamps from
Tip revision: 078c79d
EXECUTIVE.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: EXECUTIVE.agc
## Purpose: A module for revision 0 of BURST120 (Sunburst). It
## is part of the source code for the Lunar Module's
## (LM) Apollo Guidance Computer (AGC) for Apollo 5.
## Assembler: yaYUL
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo/index.html
## Pages: 1049-1061
## Mod history: 2016-09-30 RSB Created draft version.
## 2016-10-08 PDJ Updated against Sunburst120 scan.
## 2016-10-31 RSB Some typos.
## 2016-12-06 RSB Comments proofed using octopus/ProoferComments,
## changes made.
## 2016-06-23 RSB Fixed a bogus lower-case g in the comments.
## Page 1049
BLOCK 02
# TO ENTER A JOB REQUEST REQUIRING NO VAC AREA:
NOVAC TS NEWPRIO # SAVE PRIORITY OF NEW JOB.
EXTEND
INDEX Q # Q WILL BE UNDISTURBED THROUGHOUT.
DCA 0 # 2CADR OF JOB ENTERED.
DXCH NEWLOC
CAF EXECBANK
XCH FBANK
TS EXECTEM1
TCF NOVAC2 # ENTER EXECUTIVE BANK.
# TO ENTER A JOB REQUEST REQUIRING A VAC AREA - E.G., ALL (PARTIALLY) INTERPRETIVE JOBS.
FINDVAC TS NEWPRIO
EXTEND
INDEX Q
DCA 0
DXCH NEWLOC
CAF EXECBANK
XCH FBANK
TCF FINDVAC2 # OFF TO EXECUTIVE SWITCHED-BANK.
# TO ENTER A FINDVAC WITH THE PRIORITY IN NEWPRIO TO THE 2CADR ARRIVING IN A AND L:
SPVAC XCH Q
AD NEG2
XCH Q
TCF FINDVAC +4
# TO SUSPEND A BASIC JOB SO A HIGHER PRIORITY JOB MAY BE SERVICED:
CHANG1 CAF EXECBANK
TS L
CA Q
LXCH BBANK
+4 INHINT
TCF CHANJOB
# TO SUSPEND AN INTERPRETIVE JOB:
CHANG2 CAF EXECBANK
# ITRACE (4) REFERS TO "CHANG2".
TS BBANK
CS LOC # NEGATIVE LOC SHOWS JOB = INTERPRETIVE.
LXCH BANKSET # BANKSET, NOT BBANK, HAS RIGHT CONTENTS.
TCF CHANG1 +4
## Page 1050
# TO VOLUNTARILY SUSPEND A JOB UNTIL THE COMPLETION OF SOME ANTICIPATED EVENT (I/O EVENT ETC.):
JOBSLEEP TS LOC
CAF EXECBANK
TS FBANK
TCF JOBSLP1
# TO AWAKEN A JOB PUT TO SLEEP IN THE ABOVE FASHION:
JOBWAKE TS NEWLOC
CS TWO # EXIT IS VIA FINDVAC/NOVAC PROCEDURES.
ADS Q
CAF EXECBANK
XCH FBANK
TCF JOBWAKE2
# TO CHANGE THE PRIORITY OF A JOB CURRENTLY UNDER EXECUTION:
PRIOCHNG INHINT # NEW PRIORITY ARRIVES IN A. RETURNS TO
TS NEWPRIO # CALLER AS SOON AS NEW JOB PRIORITY IS
CAF EXECBANK # HIGHEST. PREPARE FOR POSSIBLE BASIC-
XCH BBANK # STYLE CHANGE-JOB.
TS BANKSET
CA Q
TCF PRIOCH2
# TO FREE THE DISPLAY BEFORE ENDOFJOB:
EJFREE TC FREEDSP
# TO REMOVE A JOB FROM EXECUTIVE CONSIDERATIONS:
ENDOFJOB CAF EXECBANK
TS FBANK
TCF ENDJOB1
ENDFIND CA EXECTEM1 # RETURN TO CALLER AFTER JOB ENTRY
TS FBANK # COMPLETE.
TCF Q+2
EXECBANK CADR FINDVAC2
## Page 1051
# LOCATE AN AVAILABLE VAC AREA.
BANK 01
FINDVAC2 TS EXECTEM1 # (SAVE CALLER'S BANK FIRST.)
CCS VAC1USE
TCF VACFOUND
CCS VAC2USE
TCF VACFOUND
CCS VAC3USE
TCF VACFOUND
CCS VAC4USE
TCF VACFOUND
CCS VAC5USE
TCF VACFOUND
TC ABORT
OCT 1201 # NO VAC AREAS.
VACFOUND AD TWO # RESERVE THIS VAC AREA BY STORING A ZERO
ZL # IN ITS VAC USE REGISTER AND STORE THE
INDEX A # ADDRESS OF THE FIRST WORD OF IT IN THE
LXCH 0 -1 # LOW NINE BITS OF THE PRIORITY WORD.
ADS NEWPRIO
NOVAC2 CAF ZERO # NOVAC ENTERS HERE. FIND A CORE SET.
TS LOCCTR
CAF NO.CORES # SEVEN SETS OF ELEVEN REGISTERS EACH.
NOVAC3 TS EXECTEM2
INDEX LOCCTR
CCS PRIORITY # EACH PRIORITY REGISTER CONTAINS -0 IF
TCF NEXTCORE # THE CORrESPONDING CORE SET IS AVAILABLE.
NO.CORES DEC 6
TCF NEXTCORE # AN ACTIVE JOB HAS A POSITIVE PRIORITY
# BUT A DORMANT JOB'S PRIORITY IS NEGATIVE
## Page 1052
CORFOUND CA NEWPRIO # SET THE PRIORITY OF THIS JOB IN THE CORE
INDEX LOCCTR # SET'S PRIORITY REGISTER AND SET THE
TS PRIORITY # JOB'S PUSH-DOWN POINTER AT THE BEGINNING
MASK LOW9 # OF THE WORK AREA AND OVERFLOW INDICATOR
INDEX LOCCTR
TS PUSHLOC # OFF TO PREPARE FOR INTERPRETIVE PROGRAMS
CCS LOCCTR # IF CORE SET ZERO IS BEING LOADED, SET UP
TCF SETLOC # OVFIND AND FIXLOC IMMEDIATELY.
TS OVFIND
CA PUSHLOC
TS FIXLOC
SPECTEST CCS NEWJOB # SEE IF ANY ACTIVE JOBS WAITING (RARE).
TCF SETLOC # MUST BE AWAKENED BUT UNCHANGED JOB.
TC CCSHOLE
TC CCSHOLE
TS NEWJOB # +0 SHOWS ACTIVE JOB ALREADY SET.
DXCH NEWLOC
DXCH LOC
TCF ENDFIND
SETLOC DXCH NEWLOC # SET UP THE LOCATION REGISTERS FOR THIS
INDEX LOCCTR
DXCH LOC
INDEX NEWJOB # THIS INDEX INSTRUCTION INSURES THAT THE
CS PRIORITY # HIGHEST ACTIVE PRIORITY WILL BE COMPARED
AD NEWPRIO # WITH THE NEW PRIORITY TO SEE IF NEWJOB
EXTEND # SHOULD BE SET TO SIGNAL A SWITCH.
BZMF ENDFIND
CA LOCCTR # LOCCTR IS LEFT SET AT THIS CORE SET IF
TS NEWJOB # THE CALLER WANTS TO LOAD ANY MPAC
TCF ENDFIND # REGISTERS, ETC.
NEXTCORE CAF COREINC
ADS LOCCTR
CCS EXECTEM2
TCF NOVAC3
TC ABORT # NO CORE SETS.
OCT 1202
## Page 1053
# THE FOLLOWING ROUTINE SWAPS CORE SET 0 WITH THAT WHOSE RELATIVE ADDRESS IS IN NEWJOB.
-1 DXCH LOC
CHANJOB INDEX NEWJOB # LOC ARRIVES IN A AND BBANK IN L.
DXCH LOC
DXCH LOC
DXCH MPAC # SWAP MULTI-PURPOSE ACCUMULATOR AREAS.
INDEX NEWJOB
DXCH MPAC
DXCH MPAC
DXCH MPAC +2
INDEX NEWJOB
DXCH MPAC +2
DXCH MPAC +2
DXCH MPAC +4
INDEX NEWJOB
DXCH MPAC +4
DXCH MPAC +4
DXCH MPAC +6
INDEX NEWJOB
DXCH MPAC +6
DXCH MPAC +6
CAF ZERO
XCH OVFIND # MAKE PUSHLOC NEGATIVE IF OVFIND NZ.
EXTEND
BZF +3
CS PUSHLOC
TS PUSHLOC
DXCH PUSHLOC
INDEX NEWJOB
DXCH PUSHLOC
DXCH PUSHLOC # SWAPS PUSHLOC AND PRIORITY.
CAF LOW9 # SET FIXLOC TO BASE OF VAC AREA.
MASK PRIORITY
TS FIXLOC
CCS PUSHLOC # SET OVERFLOW INDICATOR ACCORDING TO
CAF ZERO
TCF ENDPRCHG -1
CS PUSHLOC
TS PUSHLOC
CAF ONE
XCH OVFIND
TS NEWJOB
ENDPRCHG RELINT
DXCH LOC # BASIC JOBS HAVE POSITIVE ADDRESSES, SO
## Page 1054
EXTEND # DISPATCH WITH A DTCB.
BZMF +2 # IF INTERPRETIVE, SET UP EBANK, ETC.
DTCB
## Page 1055
COM # EPILOGUE TO JOB CHANGE FOR INTERPRETIVE
AD ONE
TS LOC # RESUME.
TCF INTRSM
# COMPLETE JOBSLEEP PREPARATIONS.
JOBSLP1 INHINT
CS PRIORITY # NNZ PRIORITY SHOWS JOB ASLEEP.
TS PRIORITY
CAF LOW7
MASK BBANK
TS BANKSET
CS ZERO
JOBSLP2 TS BUF +1 # HOLDS - HIGHEST PRIORITY.
TCF EJSCAN # SCAN FOR HIGHEST PRIORITY ALA ENDOFJOB.
## Page 1056
# TO WAKE UP A JOB, EACH CORE SET IS FOUND TO LOCATE ALL JOBS WHICH ARE ASLEEP. IF THE FCADR IN THE
# LOC REGISTER OF ANY SUCH JOB MATCHES THAT SUPPLIED BY THE CALLER, THAT JOB IS AWAKENED. IF NO JOB IS FOUND,
# LOCCTR IS SET TO -1 AND NO FURTHER ACTION TAKES PLACE.
JOBWAKE2 TS EXECTEM1
CAF ZERO # BEGIN CORE SET SCAN.
TS LOCCTR
CAF NO.CORES
JOBWAKE4 TS EXECTEM2
INDEX LOCCTR
CCS PRIORITY
TCF JOBWAKE3 # ACTIVE JOB - CHECK NEXT CORE SET.
COREINC DEC 12 # 12 REGISTERS PER CORE SET.
TCF WAKETEST # SLEEPING JOB - SEE IF CADR MATCHES.
JOBWAKE3 CAF COREINC
ADS LOCCTR
CCS EXECTEM2
TCF JOBWAKE4
CS ONE # EXIT IF SLEEPING JOB NOT FOUND.
TS LOCCTR
TCF ENDFIND
WAKETEST CS NEWLOC
INDEX LOCCTR
AD LOC
EXTEND
BZF +2 # IF MATCH.
TCF JOBWAKE3 # EXAMINE NEXT CORE SET IF NO MATCH.
INDEX LOCCTR # RE-COMPLEMENT PRIORITY TO SHOW JOB AWAKE
CS PRIORITY
TS NEWPRIO
INDEX LOCCTR
TS PRIORITY
CS FBANKMSK # MAKE UP THE 2CADR OF THE WAKE ADDRESS
MASK NEWLOC # USING THE CADR IN NEWLOC AND THE EBANK
AD 2K # HALF OF BBANK SAVED IN BANKSET.
XCH NEWLOC
MASK FBANKMSK
INDEX LOCCTR
AD BANKSET
TS NEWLOC +1
CCS LOCCTR # SPECIAL TREATMENT IF THIS JOB WAS
TCF SETLOC # ALREADY IN THE RUN (0) POSITION.
TCF SPECTEST
## Page 1057
# PRIORITY CHANGE. CHANGE THE CONTENTS OF PRIORITY AND SCAN FOR THE JOB OF HIGHEST PRIORITY.
PRIOCH2 TS LOC
CAF ZERO # SET FLAG TO TELL ENDJOB SCANNER IF THIS
TS BUF # JOB IS STILL HIGHEST PRIORITY.
CAF LOW9
MASK PRIORITY
AD NEWPRIO
TS PRIORITY
COM
TCF JOBSLP2 # AND TO EJSCAN.
## Page 1058
# RELEASE THIS CORE SET AND VAC AREA AND SCAN FOR THE JOB OF HIGHEST ACTIVE PRIORITY.
ENDJOB1 INHINT
CS ZERO
TS BUF +1
XCH PRIORITY
MASK LOW9
CCS A
INDEX A
TS 0
EJSCAN CCS PRIORITY +12D
TC EJ1
TC CCSHOLE
TCF +1
CCS PRIORITY +24D # EXAMINE EACH PRIORITY REGISTER TO FIND
TC EJ1 # THE JOB OF HIGHEST ACTIVE PRIORITY.
TC CCSHOLE
TCF +1
CCS PRIORITY +36D
TC EJ1
-CCSPR -CCS PRIORITY
TCF +1
CCS PRIORITY +48D
TC EJ1
TC CCSHOLE
TCF +1
CCS PRIORITY +60D
TC EJ1
TC CCSHOLE
TCF +1
CCS PRIORITY +72D
TC EJ1
TC CCSHOLE
TCF +1
## Page 1059
# EVALUATE THE RESULTS OF THE SCAN.
CCS BUF +1 # SEE IF THERE ARE ANY ACTIVE JOBS WAITING
TC CCSHOLE
TC CCSHOLE
TCF +2
TCF DUMMYJOB
CCS BUF # BUF IS ZERO IF THIS IS A PRIOCHNG AND
TCF +2 # CHANGED PRIORITY IS STILL HIGHEST.
TCF ENDPRCHG
INDEX A # OTHERWISE, SET NEWJOB TO THE RELATIVE
CAF 0 -1 # ADDRESS OF THE NEW JOB'S CORE SET.
AD -CCSPR
TS NEWJOB
TCF CHANJOB -1
EJ1 TS BUF +2
AD BUF +1 # - OLD HIGH PRIORITY.
CCS A
CS BUF +2
TCF EJ2 # NEW HIGH PRIORITY.
NOOP
INDEX Q
TC 2 # PROCEED WITH SEARCH.
EJ2 TS BUF +1
EXTEND
QXCH BUF # FOR LOCATING CCS PRIORITY + X INSTR.
INDEX BUF
TC 2
## Page 1060
# IDLING AND COMPUTER ACTIVITY (GREEN) LIGHT MAINTENANCE. THE IDLING ROUTINE IS NOT A JOB IN ITSELF,
# BUT RATHER A SUBROUTINE OF THE EXECUTIVE.
BLOCK 02
EBANK= SELFRET # SELF-CHECK STORAGE IN EBANK.
DUMMYJOB CS ZERO # SET NEWJOB TO -0 FOR IDLING.
TS NEWJOB
RELINT
CS TWO # TURN OFF THE ACTIVITY LIGHT.
EXTEND
WAND DSALMOUT
TCF CHECKNJ +2
CHECKNJ EXTEND # SPECIAL NEWJOB TEST FOR SELF-CHECK,
QXCH SELFRET # WHICH RUNS UNDER EXECUTIVE CONTROL,
+2 CCS NEWJOB # BUT DOES NOT HAVE A JOBS CORE REGISTERS.
TCF NUCHANGE # NEW JOB REQUIRING A CHANGE JOB.
CAF TWO # NEW JOB ALREADY IN POSITION FOR
TCF NUDIRECT # EXECUTION.
ADVAN CAF SELFBANK # (SIMULATOR ADVAN IF NEWJOB = 77777).
TS BBANK
TC SELFRET
NUDIRECT EXTEND # TURN THE GREEN LIGHT BACK ON.
WOR DSALMOUT
DXCH LOC # JOBS STARTED IN THIS FASHION MUST BE
DTCB # BASIC.
NUCHANGE CAF TWO
EXTEND
WOR DSALMOUT
CAF EXECBANK # SWAP CORE SETS.
TS FBANK
INHINT # CHANGE JOBS
TCF CHANJOB -1
EBANK= SELFRET
SELFBANK BBCON SELFCHK
## Page 1061
# PRIORITY CONSTANTS (NOTE IN FIXED-FIXED).
PRIO1 EQUALS BIT10
PRIO2 EQUALS BIT11
PRIO3 OCT 03000
PRIO4 EQUALS BIT12
PRIO5 OCT 05000
PRIO6 OCT 06000
PRIO7 OCT 07000
PRIO10 EQUALS BIT13
PRIO11 OCT 11000
PRIO12 = BNKJUP+4
PRIO13 OCT 13000
PRIO14 OCT 14000
PRIO15 OCT 15000
PRIO16 OCT 16000
PRIO17 OCT 17000
PRIO20 EQUALS BIT14
PRIO21 OCT 21000
PRIO22 OCT 22000
PRIO23 OCT 23000
PRIO24 = NUFAZ+10
PRIO25 OCT 25000
PRIO26 OCT 26000
PRIO27 OCT 27000
PRIO30 = BNKCAL+2
PRIO31 OCT 31000
PRIO32 OCT 32000
PRIO33 OCT 33000
PRIO34 OCT 34000
PRIO35 OCT 35000
PRIO36 OCT 36000
PRIO37 OCT 37000
# EBANK CONSTANTS IN FIXED-FIXED
EBANK3 EQUALS OCT1400
EBANK4 EQUALS BIT11
EBANK5 OCTAL 02400
EBANK6 EQUALS PRIO3
EBANK7 OCTAL 03400