Source Code
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These source-code files are part of a reconstructed copy of LUM69 Revision 2, the
flown Apollo 10 Lunar Module (LM) Apollo Guidance Computer (AGC) software.
The reconstruction began with source code of Luminary 69 revision 0 previously
transcribed from a digitized copy of that program. The code was then updated
by back-porting the R-2 lunar potential model from previously-transcribed source
code of Luminary 99. These required changes were described in the original
Luminary memos 75 and 78. The reconstructed code was verified by
matching memory-bank checksums to those listed in drawing 2021152G. Note that
page numbers in the reconstructed code match those on the Luminary 069 printout,
although the added code would likely have changed page numbers for a real LUM69
Revision 2 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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058861,000002: ## Copyright: Public domain.
058862,000003: ## Filename: SERVICE_ROUTINES.agc
058863,000004: ## Purpose: A section of LUM69 revision 2.
058864,000005: ## It is part of the reconstructed source code for the flown
058865,000006: ## version of the flight software for the Lunar Module's (LM)
058866,000007: ## Apollo Guidance Computer (AGC) for Apollo 10. The code has
058867,000008: ## been recreated from a copy of Luminary revsion 069, using
058868,000009: ## changes present in Luminary 099 which were described in
058869,000010: ## Luminary memos 75 and 78. The code has been adapted such
058870,000011: ## that the resulting bugger words exactly match those specified
058871,000012: ## for LUM69 revision 2 in NASA drawing 2021152B, which gives
058872,000013: ## relatively high confidence that the reconstruction is correct.
058873,000014: ## Reference: pp. 1368-1374
058874,000015: ## Assembler: yaYUL
058875,000016: ## Contact: Ron Burkey <info@sandroid.org>.
058876,000017: ## Website: www.ibiblio.org/apollo/index.html
058877,000018: ## Mod history: 2019-07-27 MAS Created from Luminary 69.
058878,000019:
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Page 1368
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058880,000021: 10,3416 BANK 10
058881,000022: 10,2000 SETLOC DISPLAYS
058882,000023: 10,2000 BANK
058883,000024: 10,3416 COUNT* $$/DSPLA
058884,000025:
058885,000026: 10,3416 54001 UPENT2 TS L # WHICH FLAGWORD IS IT
058886,000027: 10,3417 74757 MASK OCT7
058887,000028: 10,3420 56001 XCH L # SAVE IN L FOR INDEXING
058888,000029:
058889,000030: 10,3421 75660 MASK OCT77770 # OBTAIN THE BIT INFORMATION
058890,000031: 10,3422 00004 INHINT # PREVENT INTERUPTS
058891,000032: 10,3423 54061 TS ITEMP1 # STORE THE BIT INFORMATION TEMPORARIALY
058892,000033:
058893,000034: 10,3424 50001 NDX L
058894,000035: 10,3425 40074 CS FLAGWRD0
058895,000036: 10,3426 70061 MASK ITEMP1
058896,000037: 10,3427 50001 NDX L
058897,000038: 10,3430 26074 ADS FLAGWRD0
058898,000039: 10,3431 00003 RELINT # RELEASE INTERUPT INHIBIT
058899,000040:
058900,000041: 10,3432 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
058901,000042: 10,3433 00002 TC Q # RETURN
058902,000043:
058903,000044: 10,3434 54001 DOWNENT2 TS L # WHICH FLAGWORD IS IT
058904,000045: 10,3435 74757 MASK OCT7
058905,000046: 10,3436 56001 XCH L # SAVE IN L FOR INDEXING
058906,000047:
058907,000048: 10,3437 75660 MASK OCT77770 # OBTAIN THE BIT INFORMATION
058908,000049: 10,3440 40000 COM # START TO PROCESS THE INFORMATION
058909,000050:
058910,000051: 10,3441 00004 INHINT # PREVENT INTERUPTS
058911,000052: 10,3442 50001 NDX L
058912,000053: 10,3443 70074 MASK FLAGWRD0
058913,000054: 10,3444 50001 NDX L
058914,000055: 10,3445 54074 TS FLAGWRD0
058915,000056: 10,3446 00003 RELINT # RELEASE INTERUPT INHIBIT
058916,000057:
058917,000058: 10,3447 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
058918,000059: 10,3450 00002 TC Q # RETURN
058919,000060:
058920,000061: 10,3451 4757 OCT7 EQUALS SEVEN
058921,000062:
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Page 1369
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058923,000064: # UPFLAG AND DOWNFLAG ARE ENTIRELY GENERAL FLAG SETTING AND CLEARING SUBROUTINES. USING THEM, WHETHER OR
058924,000065: # NOT IN INTERRUPT, ONE MAY SET OR CLEAR ANY SINGLE, NAMED BIT IN ANY ERASABLE REGISTER, SUBJECT OF COURSE TO
058925,000066: # EBANK SETTING. A "NAMED" BIT, AS THE WORD IS USED HERE, IS ANY BIT WITH A NAME FORMALLY ASSIGNED BY THE YUL
058926,000067: # ASSEMBLER.
058927,000068:
058928,000069: # AT PRESENT THE ONLY NAMED BITS ARE THOSE IN THE FLAGWORDS. ASSEMBLER CHANGES WILL MAKE IT POSSIBLE TO
058929,000070: # NAME ANY BIT IN ERASABLE MEMORY.
058930,000071:
058931,000072: # CALLING SEQUENCES ARE AS FOLLOWS :-
058932,000073: # TC UPFLAG TC DOWNFLAG
058933,000074: # ADRES NAME OF FLAG ADRES NAME OF FLAG
058934,000075:
058935,000076: # RETURN IS TO THE LOCATION FOLLOWING THE "ADRES" ABOUT .58 MS AFTER THE "TC".
058936,000077:
058937,000078: # UPON RETURN A CONTAINS THE CURRENT FLAGWRD SETTING.
058938,000079:
058939,000080: 5504 BLOCK 02
058940,000081: 4000 SETLOC FFTAG1
058941,000082: 4000 BANK
058942,000083: 5504 COUNT* $$/FLAG
058943,000084:
058944,000085: 5504 30002 UPFLAG CA Q
058945,000086: 5505 05522 TC DEBIT
058946,000087: 5506 40000 COM # +(15 - BIT)
058947,000088: 5507 00006 EXTEND
058948,000089: 5510 04001 ROR LCHAN # SET BIT
058949,000090: 5511 50061 COMFLAG INDEX ITEMP1
058950,000091: 5512 54074 TS FLAGWRD0
058951,000092: 5513 22063 LXCH ITEMP3
058952,000093: 5514 00003 RELINT
058953,000094: 5515 00001 TC L
058954,000095:
058955,000096: 5516 30002 DOWNFLAG CA Q
058956,000097: 5517 05522 TC DEBIT
058957,000098: 5520 70001 MASK L # RESET BIT
058958,000099: 5521 15511 TCF COMFLAG
058959,000100:
058960,000101: 5522 64753 DEBIT AD ONE # GET DE BITS
058961,000102: 5523 00004 INHINT
058962,000103: 5524 54063 TS ITEMP3
058963,000104: 5525 34762 CA LOW4 # DEC15
058964,000105: 5526 54061 TS ITEMP1
058965,000106: 5527 50063 INDEX ITEMP3
058966,000107: 5530 27777 CA 0 -1 # ADRES
058967,000108: 5531 54001 TS L
058968,000109: 5532 34755 CA ZERO
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Page 1370
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058970,000111: 5533 00006 EXTEND
058971,000112: 5534 10061 DV ITEMP1 # A = FLAGWRD, L = (15 - BIT)
058972,000113: 5535 52062 DXCH ITEMP1
058973,000114: 5536 50061 INDEX ITEMP1
058974,000115: 5537 30074 CA FLAGWRD0
058975,000116: 5540 54001 TS L # CURRENT STATE
058976,000117: 5541 50062 INDEX ITEMP2
058977,000118: 5542 44735 CS BIT15 # -(15 - BIT)
058978,000119: 5543 00002 TC Q
058979,000120:
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Page 1371
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058981,000122: # DELAYJOB - A GENERAL ROUTINE TO DELAY A JOB A SPECIFIC AMOUNT OF TIME BEFORE PICKING UP AGAIN.
058982,000123:
058983,000124: # ENTRANCE REQUIREMENTS ...
058984,000125: # CAF DT DELAY JOB FOR DT CENTISECS
058985,000126: # TC BANKCALL
058986,000127: # CADR DELAYJOB
058987,000128:
058988,000129: 06,3715 BANK 06
058989,000130: 00,2000 SETLOC DLAYJOB
058990,000131: 00,2000 BANK
058991,000132:
058992,000133: # THIS MUST REMAIN IN BANK 0 *****************************************
058993,000134:
058994,000135: 00,3735 COUNT* $$/DELAY
058995,000136: 00,3735 00004 DELAYJOB INHINT
058996,000137: 00,3736 54002 TS Q # STORE DELAY DT IN Q FOR DLY -1 IN
058997,000138:
058998,000139: 00,3737 34752 CAF DELAYNUM # WAITLIST
058999,000140: 00,3740 54070 DELLOOP TS RUPTREG1
059000,000141: 00,3741 50000 INDEX A
059001,000142: 00,3742 31326 CA DELAYLOC # IS THIS DELAYLOC AVAILABLE
059002,000143: 00,3743 00006 EXTEND
059003,000144: 00,3744 13752 BZF OK2DELAY # YES
059004,000145:
059005,000146: 00,3745 10070 CCS RUPTREG1 # NO, TRY NEXT DELAYLOC
059006,000147: 00,3746 13740 TCF DELLOOP
059007,000148:
059008,000149: 00,3747 52134 DXCH BUF2
059009,000150: 00,3750 05710 TC BAILOUT1 # NO AVAILABLE LOCS.
059010,000151: 00,3751 01104 OCT 1104
059011,000152:
059012,000153: 00,3752 33772 OK2DELAY CA TCSLEEP # SET WAITLIST IMMEDIATE RETURN
059013,000154: 00,3753 54061 TS WAITEXIT
059014,000155:
059015,000156: 00,3754 30004 CA FBANK
059016,000157: 00,3755 60070 AD RUPTREG1 # STORE BBANK FOR TASK CALL
059017,000158: 00,3756 54001 TS L
059018,000159:
059019,000160: 00,3757 33773 CAF WAKECAD # STORE CADR FOR TASK CALL
059020,000161: 00,3760 15211 TCF DLY2 -1 # DLY IS IN WAITLIST ROUTINE
059021,000162:
059022,000163: 00,3761 04645 TCGETCAD TC MAKECADR # GET CALLERS FCADR
059023,000164:
059024,000165: 00,3762 50070 INDEX RUPTREG1
059025,000166: 00,3763 55326 TS DELAYLOC # SAVE DELAY CADRS
059026,000167:
059027,000168: 00,3764 05133 TC JOBSLEEP
059028,000169:
059029,000170: 00,3765 34755 WAKER CAF ZERO
059030,000171: 00,3766 50006 INDEX BBANK
059031,000172: 00,3767 57326 XCH DELAYLOC # MAKE DELAYLOC AVAILABLE
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Page 1372
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059033,000174: 00,3770 05137 TC JOBWAKE
059034,000175:
059035,000176: 00,3771 05261 TC TASKOVER
059036,000177:
059037,000178: 00,3772 03757 TCSLEEP GENADR TCGETCAD -2
059038,000179: 00,3773 03765 WAKECAD GENADR WAKER
059039,000180:
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Page 1373
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059041,000182: # GENTRAN, A BLOCK TRANSFER ROUTINE.
059042,000183:
059043,000184: # WRITTEN BY D. EYLES
059044,000185: # MOD 1 BY KERNAN UTILITYM REV 17 11/18/67
059045,000186:
059046,000187: # MOD 2 BY SCHULENBERG (REMOVE RELINT) SKIPPER REV 4 2/28/68
059047,000188:
059048,000189: # THIS ROUTINE IS USEFULL FOR TRANSFERING N CONSECUTIVE ERASABLE OR FIXED QUANTITIES TO SOME OTHER N
059049,000190: # CONSECUTIVE ERASABLE LOCATIONS. IF BOTH BLOCKS OF DATA ARE IN SWITCHABLE EBANKS, THEY MUST BE IN THE SAME ONE.
059050,000191:
059051,000192: # GENTRAN IS CALLABLE IN A JOB AS WELL AS A RUPT. THE CALLING SEQUENCE IS:
059052,000193: # I CA N-1 # OF QUANTITIES MINUS ONE.
059053,000194: # I +1 TC GENTRAN IN FIXED-FIXED.
059054,000195: # I +2 ADRES L STARTING ADRES OF DATA TO BE MOVED.
059055,000196: # I +3 ADRES M STARTING ADRES OF DUPLICATION BLOCK.
059056,000197: # I +4 RETURNS HERE.
059057,000198:
059058,000199: # GENTRAN TAKES 25 MCT'S (300 MICROSECONDS) PER ITEM + 5 MCT'S (60 MICS) FOR ENTERING AND EXITING.
059059,000200: # A, L AND ITEMP1 ARE NOT PRESERVED.
059060,000201:
059061,000202: 5544 BLOCK 02
059062,000203: 4000 SETLOC FFTAG4
059063,000204: 4000 BANK
059064,000205:
059065,000206: 5544 0061 EBANK= ITEMP1
059066,000207:
059067,000208: 5544 COUNT* $$/TRAN
059068,000209:
059069,000210: 5544 00004 GENTRAN INHINT
059070,000211: 5545 54061 TS ITEMP1 # SAVE N-1.
059071,000212: 5546 50002 INDEX Q # C(Q) = ADRES L.
059072,000213: 5547 60000 AD 0 # ADRES (L + N - 1).
059073,000214: 5550 50000 INDEX A
059074,000215: 5551 30000 CA 0 # C(ABOVE).
059075,000216: 5552 54001 TS L # SAVE DATA.
059076,000217: 5553 30061 CA ITEMP1
059077,000218: 5554 50002 INDEX Q
059078,000219: 5555 60001 AD 1 # ADRES (M + N - 1).
059079,000220: 5556 50000 INDEX A
059080,000221: 5557 22000 LXCH 0 # STUFF IT.
059081,000222: 5560 10061 CCS ITEMP1 # LOOP UNTIL N-1 = 0.
059082,000223: 5561 15545 TCF GENTRAN +1
059083,000224: 5562 16740 TCF Q+2 # RETURN TO CALLER.
059084,000225:
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Page 1374
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059086,000227: # B5OFF ZERO BIT 5 OF EXTVBACT, WHICH IS SET BY TESTXACT.
059087,000228: # MAY BE USED AS NEEDED BY ANY EXTENDED VERB WHICH HAS DONE TESTXACT
059088,000229:
059089,000230: 5563 COUNT* $$/EXTVB
059090,000231:
059091,000232: 5563 44747 B5OFF CS BIT5
059092,000233: 5564 71044 MASK EXTVBACT
059093,000234: 5565 55044 TS EXTVBACT
059094,000235: 5566 05155 TC ENDOFJOB
059095,000236:
059096,000237:
059097,000238:
End of include-file SERVICE_ROUTINES.agc. Parent file is MAIN.agc