Source Code
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These source-code files are part of a reconstructed copy of Comanche 72, the
first release of the Apollo Guidance Computer (AGC) Command Module (CM) software
for Apollo 13.
They have been adapted from sources files created from a listing of Comanche 55.
These source files were updated to match binary dumps of a set of Comanche 67 rope modules.
They were then further modified by applying known changes between Comanche 67 and Comanche 72.
A binary dump of module B2 of Comanche 72, part number 2010802-021, was also used
to validate changes made to banks 05-13. The resulting code assembles to have identical
memory-bank checksums as those specified in NASA drawing 2021153G; this gives reasonably
high confidence that the changes that have been made are correct. In places where
ambiguity exists, this ambiguity is discussed in "## Reconstruction:" comments.
Since no contemporary listings of Comanche 72 are available as source material,
all comments and labels are approximate.
They have been taken from other AGC programs where possible, or, in some places, written
from scratch to match what we believe would have been in the original listing.
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017778,000002: ## Copyright: Public domain.
017779,000003: ## Filename: SYSTEM_TEST_STANDARD_LEAD_INS.agc
017780,000004: ## Purpose: A section of Comanche revision 072.
017781,000005: ## It is part of the reconstructed source code for the first
017782,000006: ## release of the software for the Command Module's (CM) Apollo
017783,000007: ## Guidance Computer (AGC) for Apollo 13. No original listings
017784,000008: ## of this program are available; instead, this file was recreated
017785,000009: ## from a printout of Comanche 055, binary dumps of a set of
017786,000010: ## Comanche 067 rope modules, and changelogs between Comanche 067
017787,000011: ## and 072. It has been adapted such that the resulting bugger words
017788,000012: ## exactly match those specified for Comanche 072 in NASA drawing
017789,000013: ## 2021153G, which gives relatively high confidence that the
017790,000014: ## reconstruction is correct.
017791,000015: ## Assembler: yaYUL
017792,000016: ## Contact: Ron Burkey <info@sandroid.org>.
017793,000017: ## Website: www.ibiblio.org/apollo/index.html
017794,000018: ## Mod history: 2024-05-13 MAS Created from Comanche 067.
017795,000019:
017796,000020: 22,3151 E5,1671 EBANK= XSM
017797,000021:
017798,000022: 33,2000 BANK 33
017799,000023: 13,2000 SETLOC E/PROG1
017800,000024: 13,2000 BANK
017801,000025:
017802,000026: 13,2036 COUNT* $$/P07
017803,000027:
017804,000028: # SPECIAL PROGRAMS TO EASE THE PANGS OF ERASABLE MEMORY PROGRAMS.
017805,000029:
017806,000030: # E/BKCALL FOR DOING BANKCALLS FROM AND RETURNING TO ERASABLE.
017807,000031:
017808,000032: # THIS ROUTINE IS CALLABLE FROM ERASABLE OR FIXED. LIKE BANKCALL, HOWEVER, SWITCHING BETWEEN S3 AND S4
017809,000033: # IS NOT POSSIBLE.
017810,000034:
017811,000035: # THE CALLING SEQUENCE IS:
017812,000036:
017813,000037: # TC BANKCALL
017814,000038: # CADR E/BKCALL
017815,000039: # CADR ROUTINE WHERE YOU WANT TO GO IN FIXED.
017816,000040: # RETURN HERE FROM DISPLAY TERMINATE, BAD STALL OR TC Q.
017817,000041: # RETURN HERE FROM DISPLAY PROCEED OR GOOD RETURN FROM STALL.
017818,000042: # RETURN HERE FROM DISPLAY ENTER OR RECYCLE.
017819,000043:
017820,000044: # THIS ROUTINE REQUIRES TWO ERASABLES (EBUF2, +1) IN UNSWITCHED WHICH ARE UNSHARED BY INTERRUPTS AND
017821,000045: # OTHER EMEMORY PROGRAMS.
017822,000046:
017823,000047: # A + L ARE PRESERVED THROUGH BANKCALL AND E/BKCALL.
017824,000048:
017825,000049: 13,2036 52134 E/BKCALL DXCH BUF2 # SAVE A,L AND GET DP RETURN.
017826,000050: 13,2037 52364 DXCH EBUF2 # SAVE DP RETURN.
017827,000051: 13,2040 24363 INCR EBUF2 # RETURN +1 BECAUSE DOUBLE CADR.
017828,000052: 13,2041 30006 CA BBANK
017829,000053: 13,2042 75070 MASK LOW10 # GET CURRENT EBANK. (SBANK SOMEDAY)
017830,000054: 13,2043 26364 ADS EBUF2 +1 # FORM BBCON. (WAS FBANK)
017831,000055: 13,2044 50363 NDX EBUF2
017832,000056: 13,2045 27777 CA 0 -1 # GET CADR OF ROUTINE.
017833,000057: 13,2046 04702 TC SWCALL # GO TO ROUTINE, SETTING Q TO SWRETURN
017834,000058: # AND RESTORING A + L.
017835,000059: 13,2047 02053 TC +4 # TX Q, V34, OR BAD STALL RETURN.
017836,000060: 13,2050 02052 TC +2 # PROCEED OR GOOD STALL RETURN.
017837,000061: 13,2051 24363 INCR EBUF2 # ENTER OR RECYCLE RETURN.
017838,000062: 13,2052 24363 INCR EBUF2
017839,000063: 13,2053 52364 E/SWITCH DXCH EBUF2
017840,000064: 13,2054 52006 DTCB
017841,000065:
017842,000066: # E/CALL FOR CALLING A FIXED MEMORY INTERPRETIVE SUBROUTINE FROM ERASABLE AND RETURNING TO ERASABLE.
017843,000067:
017844,000068: # THE CALLING SEQUENCE IS...
017845,000069:
017846,000070: # RTB
017847,000071: # E/CALL
017848,000072: # CADR ROUTINE THE INTERPRETIVE SUBROUTINE YOU WANT.
017849,000073: # RETURNS HERE IN INTERPRETIVE.
017850,000074:
017851,000075: 13,2055 22164 E/CALL LXCH LOC # ADRES -1 OF CADR.
017852,000076: 13,2056 50001 INDEX L
017853,000077: 13,2057 30001 CA L # CADR IN A.
017854,000078: 13,2060 24001 INCR L
017855,000079: 13,2061 24001 INCR L # RETURN ADRES IN L.
017856,000080: 13,2062 52364 DXCH EBUF2 # STORE CADR AND RETURN.
017857,000081: 13,2063 06006 TC INTPRET
017858,000082: 13,2064 77624 CALL
017859,000083: 13,2065 00363 EBUF2 # INDIRECTLY EXECUTE ROUTINE. IT MUST
017860,000084: 13,2066 77776 EXIT # LEAVE VIA RVQ OR EQUIVALENT.
017861,000085: 13,2067 22364 LXCH EBUF2 +1 # PICK UP RETURN.
017862,000086: 13,2070 16010 TCF INTPRET +2 # SET LOC AND RETURB TO CALLER
017863,000087:
017864,000088: # E/JOBWAK FOR WAKING UP ERASABLE MEMORY JOBS.
017865,000089:
017866,000090: # THIS ROUTINE MUST BE CALLED IN INTERRUPT OR WITH INTERRUPTS INHIBITED.
017867,000091:
017868,000092: # THE CALLING SEQUENCE IS:
017869,000093:
017870,000094: # INHINT
017871,000095: # .
017872,000096: # .
017873,000097: # CA WAKEADR ADDRESS OF SLEEPING JOB
017874,000098: # TC IBNKCALL
017875,000099: # CADR E/JOBWAK
017876,000100: # . RETURNS HERE
017877,000101: # .
017878,000102: # .
017879,000103: # RELINT IF YOU DID AN INHINT.
017880,000104:
017881,000105: 33,2000 BANK 33
017882,000106: 04,2000 SETLOC E/PROG
017883,000107: 04,2000 BANK
017884,000108:
017885,000109: 04,2606 COUNT* $$/P07
017886,000110:
017887,000111: 04,2606 05215 E/JOBWAK TC JOBWAKE # ARRIVE IWTH ADRES IN A.
017888,000112: 04,2607 45021 CS BIT11
017889,000113: 04,2610 50064 NDX LOCCTR
017890,000114: 04,2611 26164 ADS LOC # KNOCK FIXED MEMORY BIT OUT OF ADRES.
017891,000115: 04,2612 00072 TC RUPTREG3 # RETURN
017892,000116:
017893,000117:
017894,000118: # THESE PROGRAMS ARE PROVIDED TO ALLOW OVERLAY OF BANKS 30 THRU 33 OF THE 205 VERSIONS OF SYSTEM TESTS AND
017895,000119: # PRELAUNCH ALIGN. THE INTENT IS TO ALLOW THE STG AND HYBRID LABS TO RUN ALL THE TESTS WITH COLOSSUS.
017896,000120:
017897,000121:
017898,000122: 33,2000 BANK 33
017899,000123: 33,2000 SETLOC TESTLEAD
017900,000124: 33,2000 BANK
017901,000125:
017902,000126: 33,2000 COUNT 33/COMST
017903,000127:
017904,000128: 33,2000 E5,1425 EBANK= QPLACE
017905,000129:
017906,000130: 33,2000 03436 COMPVER TC GCOMPVER # MUST BE 33,2000.
017907,000131:
017908,000132: 33,2001 03131 GTSCPSS1 TC GTSCPSS # MUST BE AT 33,2001
017909,000133:
017910,000134: 33,2002 05370 REDO TC NEWMODEX # DISPLAY MM 07.
017911,000135: 33,2003 00007 MM 07 B-14 # FALL INTO IMUTEST
017912,000136:
End of include-file SYSTEM_TEST_STANDARD_LEAD_INS.agc. Parent file is MAIN.agc