Source Code
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These source-code files are part of a reconstructed copy of Comanche 72/3 (AKA Manche72 revision 3),
the final, flown mission release of the Apollo Guidance Computer (AGC) Command Module (CM) software
for Apollo 13.
The starting point was the source code of Comanche 72 (itself previously reconstructed). Comanche 72
source code was then modified by incorporating changes known from contemporary documentation to have
been made between revisions 72 and 72/3. 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 72/3 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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061881,000002: ## Copyright: Public domain.
061882,000003: ## Filename: SERVICE_ROUTINES.agc
061883,000004: ## Purpose: A section of Manche72 revision 3.
061884,000005: ## It is part of the reconstructed source code for the final, flown
061885,000006: ## release of the software for the Command Module's (CM) Apollo
061886,000007: ## Guidance Computer (AGC) for Apollo 13. No original listings
061887,000008: ## of this program are available; instead, this file was recreated
061888,000009: ## from a reconstructed copy of Comanche 072. It has been adapted
061889,000010: ## such that the resulting bugger words exactly match those
061890,000011: ## specified for Manche72 revision 3 in NASA drawing 2021153G,
061891,000012: ## which gives relatively high confidence that the reconstruction
061892,000013: ## is correct.
061893,000014: ## Assembler: yaYUL
061894,000015: ## Contact: Ron Burkey <info@sandroid.org>.
061895,000016: ## Website: www.ibiblio.org/apollo/index.html
061896,000017: ## Mod history: 2024-05-19 MAS Created from Comanche 072.
061897,000018:
061898,000019: 7722 BLOCK 3
061899,000020: 6000 SETLOC FFTAG6
061900,000021: 6000 BANK
061901,000022: 7722 COUNT 03/FLAG
061902,000023:
061903,000024: 7722 54001 UPENT2 TS L # WHICH FLAGWORD IS IT
061904,000025: 7723 75037 MASK OCT7
061905,000026: 7724 56001 XCH L # SAVE IN L FOR INDEXING
061906,000027:
061907,000028: 7725 75735 MASK OCT77770 # OBTAIN THE BIT INFORMATION
061908,000029: 7726 00004 INHINT # PREVENT INTERUPTS
061909,000030: 7727 54061 TS ITEMP1 # STORE THE BIT INFORMATION TEMPORARIALY
061910,000031:
061911,000032: 7730 50001 NDX L
061912,000033: 7731 40074 CS FLAGWRD0
061913,000034: 7732 70061 MASK ITEMP1
061914,000035: 7733 50001 NDX L
061915,000036: 7734 26074 ADS FLAGWRD0
061916,000037: 7735 00003 RELINT # RELEASE INTERUPT INHIBIT
061917,000038:
061918,000039: 7736 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
061919,000040: 7737 00002 TC Q # RETURN
061920,000041:
061921,000042: 7740 54001 DOWNENT2 TS L # WHICH FLAGWORD IS IT
061922,000043: 7741 75037 MASK OCT7
061923,000044: 7742 56001 XCH L # SAVE IN L FOR INDEXING
061924,000045:
061925,000046: 7743 75735 MASK OCT77770 # OBTAIN THE BIT INFORMATION
061926,000047: 7744 40000 COM # START TO PROCESS THE INFORMATION
061927,000048:
061928,000049: 7745 00004 INHINT # PREVENT INTERUPTS
061929,000050: 7746 50001 NDX L
061930,000051: 7747 70074 MASK FLAGWRD0
061931,000052: 7750 50001 NDX L
061932,000053: 7751 54074 TS FLAGWRD0
061933,000054: 7752 00003 RELINT # RELEASE INTERUPT INHIBIT
061934,000055:
061935,000056: 7753 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
061936,000057: 7754 00002 TC Q # RETURN
061937,000058:
061938,000059: 7755 5037 OCT7 EQUALS SEVEN
061939,000060: 10,3766 BANK 10
061940,000061:
061941,000062: # UPFLAG AND DOWNFLAG ARE ENTIRELY GENERAL FLAG SETTING AND CLEARING SUBROUTINES. USING THEM, WHETHER OR
061942,000063: # NOT IN INTERRUPT, ONE MAY SET OR CLEAR ANY SINGLE, NAMED BIT IN ANY ERASABLE REGISTER, SUBJECT OF COURSE TO
061943,000064: # EBANK SETTING. A "NAMED" BIT, AS THE WORD IS USED HERE, IS ANY BIT WITH A NAME FORMALLY ASSIGNED BY THE YUL
061944,000065: # ASSEMBLER.
061945,000066:
061946,000067: # AT PRESENT THE ONLY NAMED BITS ARE THOSE IN THE FLAGWORDS. ASSEMBLER CHANGES WILL MAKE IT POSSIBLE TO
061947,000068: # NAME ANY BIT IN ERASABLE MEMORY.
061948,000069:
061949,000070: # CALLING SEQUENCES ARE AS FOLLOWS:-
061950,000071: # TC UPFLAG TC DOWNFLAG
061951,000072: # ADRES NAME OF FLAG ADRES NAME OF FLAG
061952,000073:
061953,000074: # RETURN IS TO THE LOCATION FOLLOWING THE "ADRES" ABOUT .58 MS AFTER THE "TC".
061954,000075: # UPON RETURN A CONTAINS THE CURRENT FLAGWRD SETTING.
061955,000076:
061956,000077: 5562 BLOCK 02
061957,000078: 4000 SETLOC FFTAG1
061958,000079: 4000 BANK
061959,000080: 5562 COUNT* $$/FLAG
061960,000081:
061961,000082: 5562 30002 UPFLAG CA Q
061962,000083: 5563 05600 TC DEBIT
061963,000084: 5564 40000 COM # +(15 - BIT)
061964,000085: 5565 00006 EXTEND
061965,000086: 5566 04001 ROR LCHAN # SET BIT
061966,000087: 5567 50061 COMFLAG INDEX ITEMP1
061967,000088: 5570 54074 TS FLAGWRD0
061968,000089: 5571 22063 LXCH ITEMP3
061969,000090: 5572 00003 RELINT
061970,000091: 5573 00001 TC L
061971,000092:
061972,000093: 5574 30002 DOWNFLAG CA Q
061973,000094: 5575 05600 TC DEBIT
061974,000095: 5576 70001 MASK L # RESET BIT
061975,000096: 5577 15567 TCF COMFLAG
061976,000097:
061977,000098: 5600 65033 DEBIT AD ONE # GET DE BITS
061978,000099: 5601 00004 INHINT
061979,000100: 5602 54063 TS ITEMP3
061980,000101: 5603 35042 CA LOW4 # DEC15
061981,000102: 5604 54061 TS ITEMP1
061982,000103: 5605 50063 INDEX ITEMP3
061983,000104: 5606 27777 CA 0 -1 # ADRES
061984,000105: 5607 54001 TS L
061985,000106: 5610 35035 CA ZERO
061986,000107: 5611 00006 EXTEND
061987,000108: 5612 10061 DV ITEMP1 # A = FLAGWRD, L = (15 - BIT)
061988,000109: 5613 52062 DXCH ITEMP1
061989,000110: 5614 50061 INDEX ITEMP1
061990,000111: 5615 30074 CA FLAGWRD0
061991,000112: 5616 54001 TS L # CURRENT STATE
061992,000113: 5617 50062 INDEX ITEMP2
061993,000114: 5620 45015 CS BIT15 # -(15 - BIT)
061994,000115: 5621 00002 TC Q
061995,000116:
061996,000117: # DELAYJOB- A GENERAL ROUTINE TO DELAY A JOB A SPECIFIC AMOUNT OF TIME BEFORE PICKING UP AGAIN.
061997,000118:
061998,000119: # ENTRANCE REQUIREMENTS...
061999,000120: # CAF DT DELAY JOB FOR DT CENTISECS
062000,000121: # TC BANKCALL
062001,000122: # CADR DELAYJOB
062002,000123:
062003,000124: 06,3770 BANK 06
062004,000125: 00,2000 SETLOC DLAYJOB
062005,000126: 00,2000 BANK
062006,000127:
062007,000128: # THIS MUST REMAIN IN BANK 0 *****************************************
062008,000129:
062009,000130: 00,3732 COUNT 00/DELAY
062010,000131:
062011,000132: 00,3732 00004 DELAYJOB INHINT
062012,000133: 00,3733 54002 TS Q # STORE DELAY DT IN Q FOR DLY -1 IN
062013,000134: 00,3734 36214 CAF DELAYNUM # WAITLIST
062014,000135: 00,3735 54070 DELLOOP TS RUPTREG1
062015,000136: 00,3736 50000 INDEX A
062016,000137: 00,3737 31141 CA DELAYLOC # IS THIS DELAYLOC AVAILABLE
062017,000138: 00,3740 00006 EXTEND
062018,000139: 00,3741 13746 BZF OK2DELAY # YES
062019,000140:
062020,000141: 00,3742 10070 CCS RUPTREG1 # NO, TRY NEXT DELAYLOC
062021,000142: 00,3743 13735 TCF DELLOOP
062022,000143:
062023,000144: 00,3744 07755 TC BAILOUT # NO AVAILABLE LOCS AVAILABLE.
062024,000145: 00,3745 31104 OCT 31104
062025,000146:
062026,000147: 00,3746 33766 OK2DELAY CA TCSLEEP # SET WAITLIST IMMEDIATE RETURN
062027,000148: 00,3747 54061 TS WAITEXIT
062028,000149:
062029,000150: 00,3750 30004 CA FBANK
062030,000151: 00,3751 60070 AD RUPTREG1 # STORE BBANK FOR TASK CALL
062031,000152: 00,3752 54001 TS L
062032,000153:
062033,000154: 00,3753 33767 CAF WAKECAD # STORE CADR FOR TASK CALL
062034,000155: 00,3754 15271 TCF DLY2 -1 # DLY IS IN WAITLIST ROUTINE
062035,000156:
062036,000157: 00,3755 04725 TCGETCAD TC MAKECADR # GET CALLERS FCADR
062037,000158:
062038,000159: 00,3756 50070 INDEX RUPTREG1
062039,000160: 00,3757 55141 TS DELAYLOC # SAVE DELAY CADRS
062040,000161:
062041,000162: 00,3760 05211 TC JOBSLEEP
062042,000163:
062043,000164: 00,3761 35035 WAKER CAF ZERO
062044,000165: 00,3762 50006 INDEX BBANK
062045,000166: 00,3763 57141 XCH DELAYLOC # MAKE DELAYLOC AVAILABLE
062046,000167: 00,3764 05215 TC JOBWAKE
062047,000168:
062048,000169: 00,3765 05340 TC TASKOVER
062049,000170:
062050,000171: 00,3766 03753 TCSLEEP GENADR TCGETCAD -2
062051,000172: 00,3767 03761 WAKECAD GENADR WAKER
062052,000173:
062053,000174: # GENTRAN, A BLOCK TRANSFER ROUTINE.
062054,000175: # WRITTEN BY D. EYLES
062055,000176: # MOD 1 BY KERNAN UTILITYM REV 17 11/18/67
062056,000177: # MOD 2 BY SCHULENBERG (REMOVE RELINT) SKIPPER REV 4 2/28/68
062057,000178:
062058,000179: # THIS ROUTINE IS USEFULL FOR TRANSFERING N CONSECUTIVE ERASABLE OR FIXED QUANTITIES TO SOME OTHER N
062059,000180: # CONSECUTIVE ERASABLE LOCATIONS. IF BOTH BLOCKS OF DATA ARE IN SWITCHABLE EBANKS, THEY MUST BE IN THE SAME ONE.
062060,000181:
062061,000182: # GENTRAN IS CALLABLE IN A JOB AS WELL AS A RUPT. THE CALLING SEQUENCE IS:
062062,000183: # I CA N-1 # OF QUANTITIES MINUS ONE.
062063,000184: # I +1 TC GENTRAN IN FIXED-FIXED.
062064,000185: # I +2 ADRES L STARTING ADRES OF DATA TO BE MOVED.
062065,000186: # I +3 ADRES M STARTING ADRES OF DUPLICATION BLOCK.
062066,000187: # I +4 RETURNS HERE.
062067,000188:
062068,000189: # GENTRAN TAKES 25 MCT'S (300 MICROSECONDS) PER ITEM + 5 MCT'S (60 MICS) FOR ENTERING AND EXITING.
062069,000190: # A, L AND ITEMP1 ARE NOT PRESERVED.
062070,000191:
062071,000192: 5622 BLOCK 02
062072,000193: 4000 SETLOC FFTAG4
062073,000194: 4000 BANK
062074,000195:
062075,000196: 5622 0061 EBANK= ITEMP1
062076,000197:
062077,000198: 5622 COUNT* $$/TRAN
062078,000199:
062079,000200: 5622 00004 GENTRAN INHINT
062080,000201: 5623 54061 TS ITEMP1 # SAVE N-1.
062081,000202: 5624 50002 INDEX Q # C(Q) = ADRES L.
062082,000203: 5625 60000 AD 0 # ADRES (L + N - 1).
062083,000204: 5626 50000 INDEX A
062084,000205: 5627 30000 CA 0 # C(ABOVE).
062085,000206: 5630 54001 TS L # SAVE DATA.
062086,000207: 5631 30061 CA ITEMP1
062087,000208: 5632 50002 INDEX Q
062088,000209: 5633 60001 AD 1 # ADRES (M + N - 1).
062089,000210: 5634 50000 INDEX A
062090,000211: 5635 22000 LXCH 0 # STUFF IT.
062091,000212: 5636 10061 CCS ITEMP1 # LOOP UNTIL N-1 = 0.
062092,000213: 5637 15623 TCF GENTRAN +1
062093,000214: 5640 16710 TCF Q+2 # RETURN TO CALLER.
062094,000215:
062095,000216: # B5OFF ZERO BIT 5 OF EXTVBACT, WHICH IS SET BY TESTXACT.
062096,000217: # MAY BE USED AS NEEDED BY ANY EXTENDED VERB WHICH HAS DONE TESTXACT
062097,000218:
062098,000219: 5641 COUNT* $$/EXTVB
062099,000220:
062100,000221: 5641 45027 B5OFF CS BIT5
062101,000222: 5642 71044 MASK EXTVBACT
062102,000223: 5643 55044 TS EXTVBACT
062103,000224: 5644 05233 TC ENDOFJOB
062104,000225:
062105,000226: # SUBROUTINES TO TURN OFF AND TURN ON TRACKER FAIL LIGHT.
062106,000227:
062107,000228: 5645 00004 TRFAILOF INHINT
062108,000229: 5646 47704 CS OCT40200 # TURN OFF TRACKER LIGHT
062109,000230: 5647 71036 MASK DSPTAB +11D
062110,000231: 5650 65015 AD BIT15
062111,000232: 5651 55036 TS DSPTAB +11D
062112,000233: 5652 41331 CS OPTMODES # TO INSURE THAT OCDU FAIL WILL GO ON
062113,000234: 5653 75025 MASK BIT7 # AGAIN IF IT WAS ON IN ADDITION TO
062114,000235: 5654 27331 ADS OPTMODES # TRACKER FAIL.
062115,000236:
062116,000237: 5655 00003 REQ RELINT
062117,000238: 5656 00002 TC Q
062118,000239:
062119,000240: 5657 00004 TRFAILON INHINT
062120,000241: 5660 41036 CS DSPTAB +11D # TURN ON
062121,000242: 5661 77704 MASK OCT40200
062122,000243: 5662 27036 ADS DSPTAB +11D
062123,000244: 5663 15655 TCF REQ
062124,000245:
062125,000246:
062126,000247:
062127,000248:
End of include-file SERVICE_ROUTINES.agc. Parent file is MAIN.agc