Source Code
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These source-code files are part of a reconstructed copy of Comanche 44, the
initial release (though not the final mission release) of the Apollo 10
Command Module (CM) Apollo Guidance Computer (AGC) software. Subsequent releases
were Comanche 45 and Comanche 45/2 (the flown release on Apollo 10). The reconstruction
is believed to be exactly accurate, but in the absence of an actual Apollo-era
listing of Comanche 44, some explanation of the reconstruction process is needed
to insure confidence in that accuracy.
The starting point was the source code of Comanche 51
(separately previously reconstructed from an Apollo-era listing of Comanche 55,
flown on Apollo 11). Comanche 51 source code was then modified
by undoing changes known to have been made between revisions 44 and 51. The now-reconstructed
Comanche 44 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 match those on the Comanche 55 printout,
although the source code would likely have different page numbers in a contemporary
Comanche 44 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 51. Here's a guide to the Apollo documentation referenced
in those annotations:
In most cases, only the titles (rather than the full texts) of PCRs are known. In addition to the
explanatory annotations, there is also
a step-by-step 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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018184,000002: ## Copyright: Public domain.
018185,000003: ## Filename: SYSTEM_TEST_STANDARD_LEAD_INS.agc
018186,000004: ## Purpose: A section of Comanche revision 044.
018187,000005: ## It is part of the reconstructed source code for the
018188,000006: ## original release of the flight software for the Command
018189,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 10.
018190,000008: ## The code has been recreated from a copy of Comanche 055. It
018191,000009: ## has been adapted such that the resulting bugger words
018192,000010: ## exactly match those specified for Comanche 44 in NASA drawing
018193,000011: ## 2021153D, which gives relatively high confidence that the
018194,000012: ## reconstruction is correct.
018195,000013: ## Assembler: yaYUL
018196,000014: ## Contact: Ron Burkey <info@sandroid.org>.
018197,000015: ## Website: www.ibiblio.org/apollo/index.html
018198,000016: ## Mod history: 2020-12-03 MAS Created from Comanche 51.
018199,000017:
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Page 420
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018201,000019: 22,3151 E5,1671 EBANK= XSM
018202,000020:
018203,000021: 33,2000 BANK 33
018204,000022: 13,2000 SETLOC E/PROG1
018205,000023: 13,2000 BANK
018206,000024:
018207,000025: 13,2036 COUNT* $$/P07
018208,000026:
018209,000027: # SPECIAL PROGRAMS TO EASE THE PANGS OF ERASABLE MEMORY PROGRAMS.
018210,000028:
018211,000029: # E/BKCALL FOR DOING BANKCALLS FROM AND RETURNING TO ERASABLE.
018212,000030:
018213,000031: # THIS ROUTINE IS CALLABLE FROM ERASABLE OR FIXED. LIKE BANKCALL, HOWEVER, SWITCHING BETWEEN S3 AND S4
018214,000032: # IS NOT POSSIBLE.
018215,000033:
018216,000034: # THE CALLING SEQUENCE IS:
018217,000035:
018218,000036: # TC BANKCALL
018219,000037: # CADR E/BKCALL
018220,000038: # CADR ROUTINE WHERE YOU WANT TO GO IN FIXED.
018221,000039: # RETURN HERE FROM DISPLAY TERMINATE, BAD STALL OR TC Q.
018222,000040: # RETURN HERE FROM DISPLAY PROCEED OR GOOD RETURN FROM STALL.
018223,000041: # RETURN HERE FROM DISPLAY ENTER OR RECYCLE.
018224,000042:
018225,000043: # THIS ROUTINE REQUIRES TWO ERASABLES (EBUF2, +1) IN UNSWITCHED WHICH ARE UNSHARED BY INTERRUPTS AND
018226,000044: # OTHER EMEMORY PROGRAMS.
018227,000045:
018228,000046: # A + L ARE PRESERVED THROUGH BANKCALL AND E/BKCALL.
018229,000047:
018230,000048: 13,2036 52134 E/BKCALL DXCH BUF2 # SAVE A,L AND GET DP RETURN.
018231,000049: 13,2037 52365 DXCH EBUF2 # SAVE DP RETURN.
018232,000050: 13,2040 24364 INCR EBUF2 # RETURN +1 BECAUSE DOUBLE CADR.
018233,000051: 13,2041 30006 CA BBANK
018234,000052: 13,2042 75054 MASK LOW10 # GET CURRENT EBANK. (SBANK SOMEDAY)
018235,000053: 13,2043 26365 ADS EBUF2 +1 # FORM BBCON. (WAS FBANK)
018236,000054: 13,2044 50364 NDX EBUF2
018237,000055: 13,2045 27777 CA 0 -1 # GET CADR OF ROUTINE.
018238,000056: 13,2046 04666 TC SWCALL # GO TO ROUTINE, SETTING Q TO SWRETURN
018239,000057: # AND RESTORING A + L.
018240,000058: 13,2047 02053 TC +4 # TX Q, V34, OR BAD STALL RETURN.
018241,000059: 13,2050 02052 TC +2 # PROCEED OR GOOD STALL RETURN.
018242,000060: 13,2051 24364 INCR EBUF2 # ENTER OR RECYCLE RETURN.
018243,000061: 13,2052 24364 INCR EBUF2
018244,000062: 13,2053 52365 E/SWITCH DXCH EBUF2
018245,000063: 13,2054 52006 DTCB
018246,000064:
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Page 421
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018248,000066: # E/CALL FOR CALLING A FIXED MEMORY INTERPRETIVE SUBROUTINE FROM ERASABLE AND RETURNING TO ERASABLE.
018249,000067:
018250,000068: # THE CALLING SEQUENCE IS...
018251,000069:
018252,000070: # RTB
018253,000071: # E/CALL
018254,000072: # CADR ROUTINE THE INTERPRETIVE SUBROUTINE YOU WANT.
018255,000073: # RETURNS HERE IN INTERPRETIVE.
018256,000074:
018257,000075: 13,2055 22164 E/CALL LXCH LOC # ADRES -1 OF CADR.
018258,000076: 13,2056 50001 INDEX L
018259,000077: 13,2057 30001 CA L # CADR IN A.
018260,000078: 13,2060 24001 INCR L
018261,000079: 13,2061 24001 INCR L # RETURN ADRES IN L.
018262,000080: 13,2062 52365 DXCH EBUF2 # STORE CADR AND RETURN.
018263,000081: 13,2063 06006 TC INTPRET
018264,000082: 13,2064 77624 CALL
018265,000083: 13,2065 00364 EBUF2 # INDIRECTLY EXECUTE ROUTINE. IT MUST
018266,000084: 13,2066 77776 EXIT # LEAVE VIA RVQ OR EQUIVALENT.
018267,000085: 13,2067 22365 LXCH EBUF2 +1 # PICK UP RETURN.
018268,000086: 13,2070 16010 TCF INTPRET +2 # SET LOC AND RETURB TO CALLER
018269,000087:
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Page 422
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018271,000089: # E/JOBWAK FOR WAKING UP ERASABLE MEMORY JOBS.
018272,000090:
018273,000091: # THIS ROUTINE MUST BE CALLED IN INTERRUPT OR WITH INTERRUPTS INHIBITED.
018274,000092:
018275,000093: # THE CALLING SEQUENCE IS:
018276,000094:
018277,000095: # INHINT
018278,000096: # .
018279,000097: # .
018280,000098: # CA WAKEADR ADDRESS OF SLEEPING JOB
018281,000099: # TC IBNKCALL
018282,000100: # CADR E/JOBWAK
018283,000101: # . RETURNS HERE
018284,000102: # .
018285,000103: # .
018286,000104: # RELINT IF YOU DID AN INHINT.
018287,000105:
018288,000106: 33,2000 BANK 33
018289,000107: 04,2000 SETLOC E/PROG
018290,000108: 04,2000 BANK
018291,000109:
018292,000110: 04,2606 COUNT* $$/P07
018293,000111:
018294,000112: 04,2606 05201 E/JOBWAK TC JOBWAKE # ARRIVE IWTH ADRES IN A.
018295,000113: 04,2607 45005 CS BIT11
018296,000114: 04,2610 50064 NDX LOCCTR
018297,000115: 04,2611 26164 ADS LOC # KNOCK FIXED MEMORY BIT OUT OF ADRES.
018298,000116: 04,2612 00072 TC RUPTREG3 # RETURN
018299,000117:
018300,000118:
018301,000119: # THESE PROGRAMS ARE PROVIDED TO ALLOW OVERLAY OF BANKS 30 THRU 33 OF THE 205 VERSIONS OF SYSTEM TESTS AND
018302,000120: # PRELAUNCH ALIGN. THE INTENT IS TO ALLOW THE STG AND HYBRID LABS TO RUN ALL THE TESTS WITH COLOSSUS.
018303,000121:
018304,000122:
018305,000123: 33,2000 BANK 33
018306,000124: 33,2000 SETLOC TESTLEAD
018307,000125: 33,2000 BANK
018308,000126:
018309,000127: 33,2000 COUNT 33/COMST
018310,000128:
018311,000129: 33,2000 E5,1425 EBANK= QPLACE
018312,000130:
018313,000131: 33,2000 03436 COMPVER TC GCOMPVER # MUST BE 33,2000.
018314,000132:
018315,000133: 33,2001 03131 GTSCPSS1 TC GTSCPSS # MUST BE AT 33,2001
018316,000134:
018317,000135: 33,2002 05354 REDO TC NEWMODEX # DISPLAY MM 07.
018318,000136: 33,2003 00007 MM 07 B-14 # FALL INTO IMUTEST
018319,000137:
End of include-file SYSTEM_TEST_STANDARD_LEAD_INS.agc. Parent file is MAIN.agc