Source Code
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These source-code files are part of a reconstructed copy of Comanche 45, the
second release, though not the final mission release, of the Apollo 10
Command Module (CM) Apollo Guidance Computer (AGC) software. Comanche 45 was
preceded by Comanche 44 and followed by Comanche 45/2 (the flown release). The reconstruction
is believed to be exactly accurate, but in the absence of an actual Apollo-era
listing of Comanche 45, some explanation of the reconstruction process is needed
to insure confidence in that accuracy.
The starting point was the source code of Comanche 44 (itself previously accurately
reconstructed). Comanche 44 source code was then modified
by incorporating changes known from contemporary documentation to have been
made between revisions 44 and 45. The now-reconstructed Comanche 45 source code was
verified by assembling it and checking that the assembled code had
the expected known-correct memory-bank checksums.
Note that page numbers in the reconstructed code tend to match those in the Comanche 55, the
most-similar revision of Comanche for which we have access to an actual non-reconstructed hardcopy;
the source code would likely have different page numbers in a contemporary
Comanche 45 listing.
Annotations that were not present in the contemporary source code have been added to the reconstructed
code to justify each change relative to Comanche 44. Here's a guide to the Apollo documentation referenced
in those annotations:
There is also
a detailed commentary about the reconstruction process.
Comments expected to have been present in the original source code are prefixed with a single '#' symbol,
whereas comments added later are prefixed by "##" or "###". Report any errors
noted by creating an
issue report at the Virtual AGC
Project's GitHub repository.
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018013,000002: ## Copyright: Public domain.
018014,000003: ## Filename: SYSTEM_TEST_STANDARD_LEAD_INS.agc
018015,000004: ## Purpose: A section of Comanche revision 045.
018016,000005: ## It is part of the reconstructed source code for the
018017,000006: ## second release of the flight software for the Command
018018,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 10.
018019,000008: ## The code has been recreated from a copy of Comanche 055. It
018020,000009: ## has been adapted such that the resulting bugger words
018021,000010: ## exactly match those specified for Comanche 45 in NASA drawing
018022,000011: ## 2021153D, which gives relatively high confidence that the
018023,000012: ## reconstruction is correct.
018024,000013: ## Assembler: yaYUL
018025,000014: ## Contact: Ron Burkey <info@sandroid.org>.
018026,000015: ## Website: www.ibiblio.org/apollo/index.html
018027,000016: ## Mod history: 2020-12-06 MAS Created from Comanche 44.
018028,000017:
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Page 420
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018030,000019: 22,3151 E5,1671 EBANK= XSM
018031,000020:
018032,000021: 33,2000 BANK 33
018033,000022: 13,2000 SETLOC E/PROG1
018034,000023: 13,2000 BANK
018035,000024:
018036,000025: 13,2036 COUNT* $$/P07
018037,000026:
018038,000027: # SPECIAL PROGRAMS TO EASE THE PANGS OF ERASABLE MEMORY PROGRAMS.
018039,000028:
018040,000029: # E/BKCALL FOR DOING BANKCALLS FROM AND RETURNING TO ERASABLE.
018041,000030:
018042,000031: # THIS ROUTINE IS CALLABLE FROM ERASABLE OR FIXED. LIKE BANKCALL, HOWEVER, SWITCHING BETWEEN S3 AND S4
018043,000032: # IS NOT POSSIBLE.
018044,000033:
018045,000034: # THE CALLING SEQUENCE IS:
018046,000035:
018047,000036: # TC BANKCALL
018048,000037: # CADR E/BKCALL
018049,000038: # CADR ROUTINE WHERE YOU WANT TO GO IN FIXED.
018050,000039: # RETURN HERE FROM DISPLAY TERMINATE, BAD STALL OR TC Q.
018051,000040: # RETURN HERE FROM DISPLAY PROCEED OR GOOD RETURN FROM STALL.
018052,000041: # RETURN HERE FROM DISPLAY ENTER OR RECYCLE.
018053,000042:
018054,000043: # THIS ROUTINE REQUIRES TWO ERASABLES (EBUF2, +1) IN UNSWITCHED WHICH ARE UNSHARED BY INTERRUPTS AND
018055,000044: # OTHER EMEMORY PROGRAMS.
018056,000045:
018057,000046: # A + L ARE PRESERVED THROUGH BANKCALL AND E/BKCALL.
018058,000047:
018059,000048: 13,2036 52134 E/BKCALL DXCH BUF2 # SAVE A,L AND GET DP RETURN.
018060,000049: 13,2037 52365 DXCH EBUF2 # SAVE DP RETURN.
018061,000050: 13,2040 24364 INCR EBUF2 # RETURN +1 BECAUSE DOUBLE CADR.
018062,000051: 13,2041 30006 CA BBANK
018063,000052: 13,2042 75054 MASK LOW10 # GET CURRENT EBANK. (SBANK SOMEDAY)
018064,000053: 13,2043 26365 ADS EBUF2 +1 # FORM BBCON. (WAS FBANK)
018065,000054: 13,2044 50364 NDX EBUF2
018066,000055: 13,2045 27777 CA 0 -1 # GET CADR OF ROUTINE.
018067,000056: 13,2046 04666 TC SWCALL # GO TO ROUTINE, SETTING Q TO SWRETURN
018068,000057: # AND RESTORING A + L.
018069,000058: 13,2047 02053 TC +4 # TX Q, V34, OR BAD STALL RETURN.
018070,000059: 13,2050 02052 TC +2 # PROCEED OR GOOD STALL RETURN.
018071,000060: 13,2051 24364 INCR EBUF2 # ENTER OR RECYCLE RETURN.
018072,000061: 13,2052 24364 INCR EBUF2
018073,000062: 13,2053 52365 E/SWITCH DXCH EBUF2
018074,000063: 13,2054 52006 DTCB
018075,000064:
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Page 421
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018077,000066: # E/CALL FOR CALLING A FIXED MEMORY INTERPRETIVE SUBROUTINE FROM ERASABLE AND RETURNING TO ERASABLE.
018078,000067:
018079,000068: # THE CALLING SEQUENCE IS...
018080,000069:
018081,000070: # RTB
018082,000071: # E/CALL
018083,000072: # CADR ROUTINE THE INTERPRETIVE SUBROUTINE YOU WANT.
018084,000073: # RETURNS HERE IN INTERPRETIVE.
018085,000074:
018086,000075: 13,2055 22164 E/CALL LXCH LOC # ADRES -1 OF CADR.
018087,000076: 13,2056 50001 INDEX L
018088,000077: 13,2057 30001 CA L # CADR IN A.
018089,000078: 13,2060 24001 INCR L
018090,000079: 13,2061 24001 INCR L # RETURN ADRES IN L.
018091,000080: 13,2062 52365 DXCH EBUF2 # STORE CADR AND RETURN.
018092,000081: 13,2063 06006 TC INTPRET
018093,000082: 13,2064 77624 CALL
018094,000083: 13,2065 00364 EBUF2 # INDIRECTLY EXECUTE ROUTINE. IT MUST
018095,000084: 13,2066 77776 EXIT # LEAVE VIA RVQ OR EQUIVALENT.
018096,000085: 13,2067 22365 LXCH EBUF2 +1 # PICK UP RETURN.
018097,000086: 13,2070 16010 TCF INTPRET +2 # SET LOC AND RETURB TO CALLER
018098,000087:
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Page 422
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018100,000089: # E/JOBWAK FOR WAKING UP ERASABLE MEMORY JOBS.
018101,000090:
018102,000091: # THIS ROUTINE MUST BE CALLED IN INTERRUPT OR WITH INTERRUPTS INHIBITED.
018103,000092:
018104,000093: # THE CALLING SEQUENCE IS:
018105,000094:
018106,000095: # INHINT
018107,000096: # .
018108,000097: # .
018109,000098: # CA WAKEADR ADDRESS OF SLEEPING JOB
018110,000099: # TC IBNKCALL
018111,000100: # CADR E/JOBWAK
018112,000101: # . RETURNS HERE
018113,000102: # .
018114,000103: # .
018115,000104: # RELINT IF YOU DID AN INHINT.
018116,000105:
018117,000106: 33,2000 BANK 33
018118,000107: 04,2000 SETLOC E/PROG
018119,000108: 04,2000 BANK
018120,000109:
018121,000110: 04,2606 COUNT* $$/P07
018122,000111:
018123,000112: 04,2606 05201 E/JOBWAK TC JOBWAKE # ARRIVE IWTH ADRES IN A.
018124,000113: 04,2607 45005 CS BIT11
018125,000114: 04,2610 50064 NDX LOCCTR
018126,000115: 04,2611 26164 ADS LOC # KNOCK FIXED MEMORY BIT OUT OF ADRES.
018127,000116: 04,2612 00072 TC RUPTREG3 # RETURN
018128,000117:
018129,000118:
018130,000119: # THESE PROGRAMS ARE PROVIDED TO ALLOW OVERLAY OF BANKS 30 THRU 33 OF THE 205 VERSIONS OF SYSTEM TESTS AND
018131,000120: # PRELAUNCH ALIGN. THE INTENT IS TO ALLOW THE STG AND HYBRID LABS TO RUN ALL THE TESTS WITH COLOSSUS.
018132,000121:
018133,000122:
018134,000123: 33,2000 BANK 33
018135,000124: 33,2000 SETLOC TESTLEAD
018136,000125: 33,2000 BANK
018137,000126:
018138,000127: 33,2000 COUNT 33/COMST
018139,000128:
018140,000129: 33,2000 E5,1425 EBANK= QPLACE
018141,000130:
018142,000131: 33,2000 03436 COMPVER TC GCOMPVER # MUST BE 33,2000.
018143,000132:
018144,000133: 33,2001 03131 GTSCPSS1 TC GTSCPSS # MUST BE AT 33,2001
018145,000134:
018146,000135: 33,2002 05354 REDO TC NEWMODEX # DISPLAY MM 07.
018147,000136: 33,2003 00007 MM 07 B-14 # FALL INTO IMUTEST
018148,000137:
End of include-file SYSTEM_TEST_STANDARD_LEAD_INS.agc. Parent file is MAIN.agc