Source Code
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These source-code files are part of a reconstructed copy of Luminary 69/2,
the flown, final release of the Apollo 10 Lunar Module (LM) Apollo Guidance Computer (AGC) software.
The reconstruction is based on the source code of Luminary 69 — i.e., the
initial, unflown version, "revision 0" — of which
a contemporary listing was available. The code was then updated by incorporating the
differences between Luminary 69 and Luminary 69/2, known from other contemporary
documentation. The only such difference is the implementation in
Luminary 69/2 of the "R-2 Lunar Potential Model", the source code for which was taken
from program Luminary 99/1 (Apollo 11 LM), of which a contemporary listing was also available.
Finally, the now-reconstructed Luminary 69/2 was then validated by assembling it to
executable form and verifying that its memory banks had the correct checksums,
known from still other contemporary documentation.
Note that page numbers in the reconstructed code match those in the original Luminary 69
program listing, or in the ORBITAL INTEGRATION log section, in Luminary 99/1. Page numbers
would certainly differ somewhat in a contemporary Luminary 69/2 listing.
Moreover, annotations that were not present in the contemporary source code have been added
to the reconstructed code to justify each change in Luminary 69/2 relative to
Luminary 69. Here's a guide to the Apollo documentation referenced in those annotations:
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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059075,000002: ## Copyright: Public domain.
059076,000003: ## Filename: SERVICE_ROUTINES.agc
059077,000004: ## Purpose: A section of LUM69 revision 2.
059078,000005: ## It is part of the reconstructed source code for the flown
059079,000006: ## version of the flight software for the Lunar Module's (LM)
059080,000007: ## Apollo Guidance Computer (AGC) for Apollo 10. The code has
059081,000008: ## been recreated from a copy of Luminary revsion 069, using
059082,000009: ## changes present in Luminary 099 which were described in
059083,000010: ## Luminary memos 75 and 78. The code has been adapted such
059084,000011: ## that the resulting bugger words exactly match those specified
059085,000012: ## for LUM69 revision 2 in NASA drawing 2021152B, which gives
059086,000013: ## relatively high confidence that the reconstruction is correct.
059087,000014: ## Reference: pp. 1368-1374
059088,000015: ## Assembler: yaYUL
059089,000016: ## Contact: Ron Burkey <info@sandroid.org>.
059090,000017: ## Website: www.ibiblio.org/apollo/index.html
059091,000018: ## Mod history: 2019-07-27 MAS Created from Luminary 69.
059092,000019:
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Page 1368
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059094,000021: 10,3416 BANK 10
059095,000022: 10,2000 SETLOC DISPLAYS
059096,000023: 10,2000 BANK
059097,000024: 10,3416 COUNT* $$/DSPLA
059098,000025:
059099,000026: 10,3416 54001 UPENT2 TS L # WHICH FLAGWORD IS IT
059100,000027: 10,3417 74757 MASK OCT7
059101,000028: 10,3420 56001 XCH L # SAVE IN L FOR INDEXING
059102,000029:
059103,000030: 10,3421 75660 MASK OCT77770 # OBTAIN THE BIT INFORMATION
059104,000031: 10,3422 00004 INHINT # PREVENT INTERUPTS
059105,000032: 10,3423 54061 TS ITEMP1 # STORE THE BIT INFORMATION TEMPORARIALY
059106,000033:
059107,000034: 10,3424 50001 NDX L
059108,000035: 10,3425 40074 CS FLAGWRD0
059109,000036: 10,3426 70061 MASK ITEMP1
059110,000037: 10,3427 50001 NDX L
059111,000038: 10,3430 26074 ADS FLAGWRD0
059112,000039: 10,3431 00003 RELINT # RELEASE INTERUPT INHIBIT
059113,000040:
059114,000041: 10,3432 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
059115,000042: 10,3433 00002 TC Q # RETURN
059116,000043:
059117,000044: 10,3434 54001 DOWNENT2 TS L # WHICH FLAGWORD IS IT
059118,000045: 10,3435 74757 MASK OCT7
059119,000046: 10,3436 56001 XCH L # SAVE IN L FOR INDEXING
059120,000047:
059121,000048: 10,3437 75660 MASK OCT77770 # OBTAIN THE BIT INFORMATION
059122,000049: 10,3440 40000 COM # START TO PROCESS THE INFORMATION
059123,000050:
059124,000051: 10,3441 00004 INHINT # PREVENT INTERUPTS
059125,000052: 10,3442 50001 NDX L
059126,000053: 10,3443 70074 MASK FLAGWRD0
059127,000054: 10,3444 50001 NDX L
059128,000055: 10,3445 54074 TS FLAGWRD0
059129,000056: 10,3446 00003 RELINT # RELEASE INTERUPT INHIBIT
059130,000057:
059131,000058: 10,3447 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
059132,000059: 10,3450 00002 TC Q # RETURN
059133,000060:
059134,000061: 10,3451 4757 OCT7 EQUALS SEVEN
059135,000062:
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Page 1369
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059137,000064: # UPFLAG AND DOWNFLAG ARE ENTIRELY GENERAL FLAG SETTING AND CLEARING SUBROUTINES. USING THEM, WHETHER OR
059138,000065: # NOT IN INTERRUPT, ONE MAY SET OR CLEAR ANY SINGLE, NAMED BIT IN ANY ERASABLE REGISTER, SUBJECT OF COURSE TO
059139,000066: # EBANK SETTING. A "NAMED" BIT, AS THE WORD IS USED HERE, IS ANY BIT WITH A NAME FORMALLY ASSIGNED BY THE YUL
059140,000067: # ASSEMBLER.
059141,000068:
059142,000069: # AT PRESENT THE ONLY NAMED BITS ARE THOSE IN THE FLAGWORDS. ASSEMBLER CHANGES WILL MAKE IT POSSIBLE TO
059143,000070: # NAME ANY BIT IN ERASABLE MEMORY.
059144,000071:
059145,000072: # CALLING SEQUENCES ARE AS FOLLOWS :-
059146,000073: # TC UPFLAG TC DOWNFLAG
059147,000074: # ADRES NAME OF FLAG ADRES NAME OF FLAG
059148,000075:
059149,000076: # RETURN IS TO THE LOCATION FOLLOWING THE "ADRES" ABOUT .58 MS AFTER THE "TC".
059150,000077:
059151,000078: # UPON RETURN A CONTAINS THE CURRENT FLAGWRD SETTING.
059152,000079:
059153,000080: 5504 BLOCK 02
059154,000081: 4000 SETLOC FFTAG1
059155,000082: 4000 BANK
059156,000083: 5504 COUNT* $$/FLAG
059157,000084:
059158,000085: 5504 30002 UPFLAG CA Q
059159,000086: 5505 05522 TC DEBIT
059160,000087: 5506 40000 COM # +(15 - BIT)
059161,000088: 5507 00006 EXTEND
059162,000089: 5510 04001 ROR LCHAN # SET BIT
059163,000090: 5511 50061 COMFLAG INDEX ITEMP1
059164,000091: 5512 54074 TS FLAGWRD0
059165,000092: 5513 22063 LXCH ITEMP3
059166,000093: 5514 00003 RELINT
059167,000094: 5515 00001 TC L
059168,000095:
059169,000096: 5516 30002 DOWNFLAG CA Q
059170,000097: 5517 05522 TC DEBIT
059171,000098: 5520 70001 MASK L # RESET BIT
059172,000099: 5521 15511 TCF COMFLAG
059173,000100:
059174,000101: 5522 64753 DEBIT AD ONE # GET DE BITS
059175,000102: 5523 00004 INHINT
059176,000103: 5524 54063 TS ITEMP3
059177,000104: 5525 34762 CA LOW4 # DEC15
059178,000105: 5526 54061 TS ITEMP1
059179,000106: 5527 50063 INDEX ITEMP3
059180,000107: 5530 27777 CA 0 -1 # ADRES
059181,000108: 5531 54001 TS L
059182,000109: 5532 34755 CA ZERO
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Page 1370
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059184,000111: 5533 00006 EXTEND
059185,000112: 5534 10061 DV ITEMP1 # A = FLAGWRD, L = (15 - BIT)
059186,000113: 5535 52062 DXCH ITEMP1
059187,000114: 5536 50061 INDEX ITEMP1
059188,000115: 5537 30074 CA FLAGWRD0
059189,000116: 5540 54001 TS L # CURRENT STATE
059190,000117: 5541 50062 INDEX ITEMP2
059191,000118: 5542 44735 CS BIT15 # -(15 - BIT)
059192,000119: 5543 00002 TC Q
059193,000120:
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Page 1371
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059195,000122: # DELAYJOB - A GENERAL ROUTINE TO DELAY A JOB A SPECIFIC AMOUNT OF TIME BEFORE PICKING UP AGAIN.
059196,000123:
059197,000124: # ENTRANCE REQUIREMENTS ...
059198,000125: # CAF DT DELAY JOB FOR DT CENTISECS
059199,000126: # TC BANKCALL
059200,000127: # CADR DELAYJOB
059201,000128:
059202,000129: 06,3715 BANK 06
059203,000130: 00,2000 SETLOC DLAYJOB
059204,000131: 00,2000 BANK
059205,000132:
059206,000133: # THIS MUST REMAIN IN BANK 0 *****************************************
059207,000134:
059208,000135: 00,3735 COUNT* $$/DELAY
059209,000136: 00,3735 00004 DELAYJOB INHINT
059210,000137: 00,3736 54002 TS Q # STORE DELAY DT IN Q FOR DLY -1 IN
059211,000138:
059212,000139: 00,3737 34752 CAF DELAYNUM # WAITLIST
059213,000140: 00,3740 54070 DELLOOP TS RUPTREG1
059214,000141: 00,3741 50000 INDEX A
059215,000142: 00,3742 31326 CA DELAYLOC # IS THIS DELAYLOC AVAILABLE
059216,000143: 00,3743 00006 EXTEND
059217,000144: 00,3744 13752 BZF OK2DELAY # YES
059218,000145:
059219,000146: 00,3745 10070 CCS RUPTREG1 # NO, TRY NEXT DELAYLOC
059220,000147: 00,3746 13740 TCF DELLOOP
059221,000148:
059222,000149: 00,3747 52134 DXCH BUF2
059223,000150: 00,3750 05710 TC BAILOUT1 # NO AVAILABLE LOCS.
059224,000151: 00,3751 01104 OCT 1104
059225,000152:
059226,000153: 00,3752 33772 OK2DELAY CA TCSLEEP # SET WAITLIST IMMEDIATE RETURN
059227,000154: 00,3753 54061 TS WAITEXIT
059228,000155:
059229,000156: 00,3754 30004 CA FBANK
059230,000157: 00,3755 60070 AD RUPTREG1 # STORE BBANK FOR TASK CALL
059231,000158: 00,3756 54001 TS L
059232,000159:
059233,000160: 00,3757 33773 CAF WAKECAD # STORE CADR FOR TASK CALL
059234,000161: 00,3760 15211 TCF DLY2 -1 # DLY IS IN WAITLIST ROUTINE
059235,000162:
059236,000163: 00,3761 04645 TCGETCAD TC MAKECADR # GET CALLERS FCADR
059237,000164:
059238,000165: 00,3762 50070 INDEX RUPTREG1
059239,000166: 00,3763 55326 TS DELAYLOC # SAVE DELAY CADRS
059240,000167:
059241,000168: 00,3764 05133 TC JOBSLEEP
059242,000169:
059243,000170: 00,3765 34755 WAKER CAF ZERO
059244,000171: 00,3766 50006 INDEX BBANK
059245,000172: 00,3767 57326 XCH DELAYLOC # MAKE DELAYLOC AVAILABLE
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Page 1372
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059247,000174: 00,3770 05137 TC JOBWAKE
059248,000175:
059249,000176: 00,3771 05261 TC TASKOVER
059250,000177:
059251,000178: 00,3772 03757 TCSLEEP GENADR TCGETCAD -2
059252,000179: 00,3773 03765 WAKECAD GENADR WAKER
059253,000180:
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Page 1373
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059255,000182: # GENTRAN, A BLOCK TRANSFER ROUTINE.
059256,000183:
059257,000184: # WRITTEN BY D. EYLES
059258,000185: # MOD 1 BY KERNAN UTILITYM REV 17 11/18/67
059259,000186:
059260,000187: # MOD 2 BY SCHULENBERG (REMOVE RELINT) SKIPPER REV 4 2/28/68
059261,000188:
059262,000189: # THIS ROUTINE IS USEFULL FOR TRANSFERING N CONSECUTIVE ERASABLE OR FIXED QUANTITIES TO SOME OTHER N
059263,000190: # CONSECUTIVE ERASABLE LOCATIONS. IF BOTH BLOCKS OF DATA ARE IN SWITCHABLE EBANKS, THEY MUST BE IN THE SAME ONE.
059264,000191:
059265,000192: # GENTRAN IS CALLABLE IN A JOB AS WELL AS A RUPT. THE CALLING SEQUENCE IS:
059266,000193: # I CA N-1 # OF QUANTITIES MINUS ONE.
059267,000194: # I +1 TC GENTRAN IN FIXED-FIXED.
059268,000195: # I +2 ADRES L STARTING ADRES OF DATA TO BE MOVED.
059269,000196: # I +3 ADRES M STARTING ADRES OF DUPLICATION BLOCK.
059270,000197: # I +4 RETURNS HERE.
059271,000198:
059272,000199: # GENTRAN TAKES 25 MCT'S (300 MICROSECONDS) PER ITEM + 5 MCT'S (60 MICS) FOR ENTERING AND EXITING.
059273,000200: # A, L AND ITEMP1 ARE NOT PRESERVED.
059274,000201:
059275,000202: 5544 BLOCK 02
059276,000203: 4000 SETLOC FFTAG4
059277,000204: 4000 BANK
059278,000205:
059279,000206: 5544 0061 EBANK= ITEMP1
059280,000207:
059281,000208: 5544 COUNT* $$/TRAN
059282,000209:
059283,000210: 5544 00004 GENTRAN INHINT
059284,000211: 5545 54061 TS ITEMP1 # SAVE N-1.
059285,000212: 5546 50002 INDEX Q # C(Q) = ADRES L.
059286,000213: 5547 60000 AD 0 # ADRES (L + N - 1).
059287,000214: 5550 50000 INDEX A
059288,000215: 5551 30000 CA 0 # C(ABOVE).
059289,000216: 5552 54001 TS L # SAVE DATA.
059290,000217: 5553 30061 CA ITEMP1
059291,000218: 5554 50002 INDEX Q
059292,000219: 5555 60001 AD 1 # ADRES (M + N - 1).
059293,000220: 5556 50000 INDEX A
059294,000221: 5557 22000 LXCH 0 # STUFF IT.
059295,000222: 5560 10061 CCS ITEMP1 # LOOP UNTIL N-1 = 0.
059296,000223: 5561 15545 TCF GENTRAN +1
059297,000224: 5562 16740 TCF Q+2 # RETURN TO CALLER.
059298,000225:
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Page 1374
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059300,000227: # B5OFF ZERO BIT 5 OF EXTVBACT, WHICH IS SET BY TESTXACT.
059301,000228: # MAY BE USED AS NEEDED BY ANY EXTENDED VERB WHICH HAS DONE TESTXACT
059302,000229:
059303,000230: 5563 COUNT* $$/EXTVB
059304,000231:
059305,000232: 5563 44747 B5OFF CS BIT5
059306,000233: 5564 71044 MASK EXTVBACT
059307,000234: 5565 55044 TS EXTVBACT
059308,000235: 5566 05155 TC ENDOFJOB
059309,000236:
059310,000237:
059311,000238:
End of include-file SERVICE_ROUTINES.agc. Parent file is MAIN.agc