Source Code
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These source-code files are part of a reconstructed copy of Comanche 051, the
original release of the Apollo 11 Command Module (CM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Comanche 055 previously transcribed
from a digitized copy of that program. The code was then updated by undoing
changes related to the R-2 lunar potential model, using hints from program
comments and change-indicating asterisks in the Comanche 055 listing as a guide.
The reconstruction was verified by matching memory-bank checksums to those listed
in drawing 2021153D. Note that page numbers in the reconstructed code match those
on the Comanche 055 printout, although the added code would likely have changed page
numbers for a real Comanche 051 listing.
Comments from 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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063023,000002: ## Copyright: Public domain.
063024,000003: ## Filename: SERVICE_ROUTINES.agc
063025,000004: ## Purpose: A section of Comanche revision 051.
063026,000005: ## It is part of the reconstructed source code for the
063027,000006: ## original release of the flight software for the Command
063028,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 11.
063029,000008: ## The code has been recreated from a copy of Comanche 055. It
063030,000009: ## has been adapted such that the resulting bugger words
063031,000010: ## exactly match those specified for Comanche 51 in NASA drawing
063032,000011: ## 2021153D, which gives relatively high confidence that the
063033,000012: ## reconstruction is correct.
063034,000013: ## Reference: pp. 1485-1492
063035,000014: ## Assembler: yaYUL
063036,000015: ## Contact: Ron Burkey <info@sandroid.org>.
063037,000016: ## Website: www.ibiblio.org/apollo/index.html
063038,000017: ## Mod history: 2019-07-30 MAS Created from Comanche 55.
063039,000018:
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Page 1485
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063041,000020: 7722 BLOCK 3
063042,000021: 6000 SETLOC FFTAG6
063043,000022: 6000 BANK
063044,000023: 7722 COUNT 03/FLAG
063045,000024:
063046,000025: 7722 54001 UPENT2 TS L # WHICH FLAGWORD IS IT
063047,000026: 7723 75023 MASK OCT7
063048,000027: 7724 56001 XCH L # SAVE IN L FOR INDEXING
063049,000028:
063050,000029: 7725 75731 MASK OCT77770 # OBTAIN THE BIT INFORMATION
063051,000030: 7726 00004 INHINT # PREVENT INTERUPTS
063052,000031: 7727 54061 TS ITEMP1 # STORE THE BIT INFORMATION TEMPORARIALY
063053,000032:
063054,000033: 7730 50001 NDX L
063055,000034: 7731 40074 CS FLAGWRD0
063056,000035: 7732 70061 MASK ITEMP1
063057,000036: 7733 50001 NDX L
063058,000037: 7734 26074 ADS FLAGWRD0
063059,000038: 7735 00003 RELINT # RELEASE INTERUPT INHIBIT
063060,000039:
063061,000040: 7736 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
063062,000041: 7737 00002 TC Q # RETURN
063063,000042:
063064,000043: 7740 54001 DOWNENT2 TS L # WHICH FLAGWORD IS IT
063065,000044: 7741 75023 MASK OCT7
063066,000045: 7742 56001 XCH L # SAVE IN L FOR INDEXING
063067,000046:
063068,000047: 7743 75731 MASK OCT77770 # OBTAIN THE BIT INFORMATION
063069,000048: 7744 40000 COM # START TO PROCESS THE INFORMATION
063070,000049:
063071,000050: 7745 00004 INHINT # PREVENT INTERUPTS
063072,000051: 7746 50001 NDX L
063073,000052: 7747 70074 MASK FLAGWRD0
063074,000053: 7750 50001 NDX L
063075,000054: 7751 54074 TS FLAGWRD0
063076,000055: 7752 00003 RELINT # RELEASE INTERUPT INHIBIT
063077,000056:
063078,000057: 7753 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
063079,000058: 7754 00002 TC Q # RETURN
063080,000059:
063081,000060: 7755 5023 OCT7 EQUALS SEVEN
063082,000061: 10,3766 BANK 10
063083,000062:
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Page 1486
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063085,000064: # UPFLAG AND DOWNFLAG ARE ENTIRELY GENERAL FLAG SETTING AND CLEARING SUBROUTINES. USING THEM, WHETHER OR
063086,000065: # NOT IN INTERRUPT, ONE MAY SET OR CLEAR ANY SINGLE, NAMED BIT IN ANY ERASABLE REGISTER, SUBJECT OF COURSE TO
063087,000066: # EBANK SETTING. A "NAMED" BIT, AS THE WORD IS USED HERE, IS ANY BIT WITH A NAME FORMALLY ASSIGNED BY THE YUL
063088,000067: # ASSEMBLER.
063089,000068:
063090,000069: # AT PRESENT THE ONLY NAMED BITS ARE THOSE IN THE FLAGWORDS. ASSEMBLER CHANGES WILL MAKE IT POSSIBLE TO
063091,000070: # NAME ANY BIT IN ERASABLE MEMORY.
063092,000071:
063093,000072: # CALLING SEQUENCES ARE AS FOLLOWS:-
063094,000073: # TC UPFLAG TC DOWNFLAG
063095,000074: # ADRES NAME OF FLAG ADRES NAME OF FLAG
063096,000075:
063097,000076: # RETURN IS TO THE LOCATION FOLLOWING THE "ADRES" ABOUT .58 MS AFTER THE "TC".
063098,000077: # UPON RETURN A CONTAINS THE CURRENT FLAGWRD SETTING.
063099,000078:
063100,000079: 5546 BLOCK 02
063101,000080: 4000 SETLOC FFTAG1
063102,000081: 4000 BANK
063103,000082: 5546 COUNT* $$/FLAG
063104,000083:
063105,000084: 5546 30002 UPFLAG CA Q
063106,000085: 5547 05564 TC DEBIT
063107,000086: 5550 40000 COM # +(15 - BIT)
063108,000087: 5551 00006 EXTEND
063109,000088: 5552 04001 ROR LCHAN # SET BIT
063110,000089: 5553 50061 COMFLAG INDEX ITEMP1
063111,000090: 5554 54074 TS FLAGWRD0
063112,000091: 5555 22063 LXCH ITEMP3
063113,000092: 5556 00003 RELINT
063114,000093: 5557 00001 TC L
063115,000094:
063116,000095: 5560 30002 DOWNFLAG CA Q
063117,000096: 5561 05564 TC DEBIT
063118,000097: 5562 70001 MASK L # RESET BIT
063119,000098: 5563 15553 TCF COMFLAG
063120,000099:
063121,000100: 5564 65017 DEBIT AD ONE # GET DE BITS
063122,000101: 5565 00004 INHINT
063123,000102: 5566 54063 TS ITEMP3
063124,000103: 5567 35026 CA LOW4 # DEC15
063125,000104: 5570 54061 TS ITEMP1
063126,000105: 5571 50063 INDEX ITEMP3
063127,000106: 5572 27777 CA 0 -1 # ADRES
063128,000107: 5573 54001 TS L
063129,000108: 5574 35021 CA ZERO
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Page 1487
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063131,000110: 5575 00006 EXTEND
063132,000111: 5576 10061 DV ITEMP1 # A = FLAGWRD, L = (15 - BIT)
063133,000112: 5577 52062 DXCH ITEMP1
063134,000113: 5600 50061 INDEX ITEMP1
063135,000114: 5601 30074 CA FLAGWRD0
063136,000115: 5602 54001 TS L # CURRENT STATE
063137,000116: 5603 50062 INDEX ITEMP2
063138,000117: 5604 45001 CS BIT15 # -(15 - BIT)
063139,000118: 5605 00002 TC Q
063140,000119:
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Page 1488
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063142,000121: # DELAYJOB- A GENERAL ROUTINE TO DELAY A JOB A SPECIFIC AMOUNT OF TIME BEFORE PICKING UP AGAIN.
063143,000122:
063144,000123: # ENTRANCE REQUIREMENTS...
063145,000124: # CAF DT DELAY JOB FOR DT CENTISECS
063146,000125: # TC BANKCALL
063147,000126: # CADR DELAYJOB
063148,000127:
063149,000128: 06,3770 BANK 06
063150,000129: 00,2000 SETLOC DLAYJOB
063151,000130: 00,2000 BANK
063152,000131:
063153,000132: # THIS MUST REMAIN IN BANK 0 *****************************************
063154,000133:
063155,000134: 00,3732 COUNT 00/DELAY
063156,000135:
063157,000136: 00,3732 00004 DELAYJOB INHINT
063158,000137: 00,3733 54002 TS Q # STORE DELAY DT IN Q FOR DLY -1 IN
063159,000138: 00,3734 36214 CAF DELAYNUM # WAITLIST
063160,000139: 00,3735 54070 DELLOOP TS RUPTREG1
063161,000140: 00,3736 50000 INDEX A
063162,000141: 00,3737 31141 CA DELAYLOC # IS THIS DELAYLOC AVAILABLE
063163,000142: 00,3740 00006 EXTEND
063164,000143: 00,3741 13746 BZF OK2DELAY # YES
063165,000144:
063166,000145: 00,3742 10070 CCS RUPTREG1 # NO, TRY NEXT DELAYLOC
063167,000146: 00,3743 13735 TCF DELLOOP
063168,000147:
063169,000148: 00,3744 07755 TC BAILOUT # NO AVAILABLE LOCS AVAILABLE.
063170,000149: 00,3745 01104 OCT 1104
063171,000150:
063172,000151: 00,3746 33766 OK2DELAY CA TCSLEEP # SET WAITLIST IMMEDIATE RETURN
063173,000152: 00,3747 54061 TS WAITEXIT
063174,000153:
063175,000154: 00,3750 30004 CA FBANK
063176,000155: 00,3751 60070 AD RUPTREG1 # STORE BBANK FOR TASK CALL
063177,000156: 00,3752 54001 TS L
063178,000157:
063179,000158: 00,3753 33767 CAF WAKECAD # STORE CADR FOR TASK CALL
063180,000159: 00,3754 15255 TCF DLY2 -1 # DLY IS IN WAITLIST ROUTINE
063181,000160:
063182,000161: 00,3755 04711 TCGETCAD TC MAKECADR # GET CALLERS FCADR
063183,000162:
063184,000163: 00,3756 50070 INDEX RUPTREG1
063185,000164: 00,3757 55141 TS DELAYLOC # SAVE DELAY CADRS
063186,000165:
063187,000166: 00,3760 05175 TC JOBSLEEP
063188,000167:
063189,000168: 00,3761 35021 WAKER CAF ZERO
063190,000169: 00,3762 50006 INDEX BBANK
063191,000170: 00,3763 57141 XCH DELAYLOC # MAKE DELAYLOC AVAILABLE
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Page 1489
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063193,000172: 00,3764 05201 TC JOBWAKE
063194,000173:
063195,000174: 00,3765 05324 TC TASKOVER
063196,000175:
063197,000176: 00,3766 03753 TCSLEEP GENADR TCGETCAD -2
063198,000177: 00,3767 03761 WAKECAD GENADR WAKER
063199,000178:
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Page 1490
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063201,000180: # GENTRAN, A BLOCK TRANSFER ROUTINE.
063202,000181: # WRITTEN BY D. EYLES
063203,000182: # MOD 1 BY KERNAN UTILITYM REV 17 11/18/67
063204,000183: # MOD 2 BY SCHULENBERG (REMOVE RELINT) SKIPPER REV 4 2/28/68
063205,000184:
063206,000185: # THIS ROUTINE IS USEFULL FOR TRANSFERING N CONSECUTIVE ERASABLE OR FIXED QUANTITIES TO SOME OTHER N
063207,000186: # CONSECUTIVE ERASABLE LOCATIONS. IF BOTH BLOCKS OF DATA ARE IN SWITCHABLE EBANKS, THEY MUST BE IN THE SAME ONE.
063208,000187:
063209,000188: # GENTRAN IS CALLABLE IN A JOB AS WELL AS A RUPT. THE CALLING SEQUENCE IS:
063210,000189: # I CA N-1 # OF QUANTITIES MINUS ONE.
063211,000190: # I +1 TC GENTRAN IN FIXED-FIXED.
063212,000191: # I +2 ADRES L STARTING ADRES OF DATA TO BE MOVED.
063213,000192: # I +3 ADRES M STARTING ADRES OF DUPLICATION BLOCK.
063214,000193: # I +4 RETURNS HERE.
063215,000194:
063216,000195: # GENTRAN TAKES 25 MCT'S (300 MICROSECONDS) PER ITEM + 5 MCT'S (60 MICS) FOR ENTERING AND EXITING.
063217,000196: # A, L AND ITEMP1 ARE NOT PRESERVED.
063218,000197:
063219,000198: 5606 BLOCK 02
063220,000199: 4000 SETLOC FFTAG4
063221,000200: 4000 BANK
063222,000201:
063223,000202: 5606 0061 EBANK= ITEMP1
063224,000203:
063225,000204: 5606 COUNT* $$/TRAN
063226,000205:
063227,000206: 5606 00004 GENTRAN INHINT
063228,000207: 5607 54061 TS ITEMP1 # SAVE N-1.
063229,000208: 5610 50002 INDEX Q # C(Q) = ADRES L.
063230,000209: 5611 60000 AD 0 # ADRES (L + N - 1).
063231,000210: 5612 50000 INDEX A
063232,000211: 5613 30000 CA 0 # C(ABOVE).
063233,000212: 5614 54001 TS L # SAVE DATA.
063234,000213: 5615 30061 CA ITEMP1
063235,000214: 5616 50002 INDEX Q
063236,000215: 5617 60001 AD 1 # ADRES (M + N - 1).
063237,000216: 5620 50000 INDEX A
063238,000217: 5621 22000 LXCH 0 # STUFF IT.
063239,000218: 5622 10061 CCS ITEMP1 # LOOP UNTIL N-1 = 0.
063240,000219: 5623 15607 TCF GENTRAN +1
063241,000220: 5624 16710 TCF Q+2 # RETURN TO CALLER.
063242,000221:
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Page 1491
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063244,000223: # B5OFF ZERO BIT 5 OF EXTVBACT, WHICH IS SET BY TESTXACT.
063245,000224: # MAY BE USED AS NEEDED BY ANY EXTENDED VERB WHICH HAS DONE TESTXACT
063246,000225:
063247,000226: 5625 COUNT* $$/EXTVB
063248,000227:
063249,000228: 5625 45013 B5OFF CS BIT5
063250,000229: 5626 71044 MASK EXTVBACT
063251,000230: 5627 55044 TS EXTVBACT
063252,000231: 5630 05217 TC ENDOFJOB
063253,000232:
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Page 1492
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063255,000234: # SUBROUTINES TO TURN OFF AND TURN ON TRACKER FAIL LIGHT.
063256,000235:
063257,000236: 5631 00004 TRFAILOF INHINT
063258,000237: 5632 47704 CS OCT40200 # TURN OFF TRACKER LIGHT
063259,000238: 5633 71036 MASK DSPTAB +11D
063260,000239: 5634 65001 AD BIT15
063261,000240: 5635 55036 TS DSPTAB +11D
063262,000241: 5636 41331 CS OPTMODES # TO INSURE THAT OCDU FAIL WILL GO ON
063263,000242: 5637 75011 MASK BIT7 # AGAIN IF IT WAS ON IN ADDITION TO
063264,000243: 5640 27331 ADS OPTMODES # TRACKER FAIL.
063265,000244:
063266,000245: 5641 00003 REQ RELINT
063267,000246: 5642 00002 TC Q
063268,000247:
063269,000248: 5643 00004 TRFAILON INHINT
063270,000249: 5644 41036 CS DSPTAB +11D # TURN ON
063271,000250: 5645 77704 MASK OCT40200
063272,000251: 5646 27036 ADS DSPTAB +11D
063273,000252: 5647 15641 TCF REQ
063274,000253:
063275,000254:
063276,000255:
063277,000256:
End of include-file SERVICE_ROUTINES.agc. Parent file is MAIN.agc