Source Code
![]() |
These source-code files were obtained by digitally photographing the
Colossus 237 program listing from the private collection of original
AGC developer Fred Martin, and then modifying pre-existing Colossus 249
(Apollo 9) source files to incorporate changes. Note that the page images
presented online are of reduced quality, and that additional images
are available. Report any conversion errors or legibility
problems in page images to info@sandroid.org.
Notations on the program listing read, in part:GAP: ASSEMBLE REVISION 237 OF AGC PROGRAM COLOSSUS BY NASA 2021111-031 1:17 AUG. 24, 1968 |
061259,000002: # Copyright: Public domain.
061260,000003: # Filename: SERVICE_ROUTINES.agc
061261,000004: # Purpose: Part of the source code for Colossus build 237.
061262,000005: # This is for the Command Module's (CM) Apollo Guidance
061263,000006: # Computer (AGC), we believe for Apollo 8.
061264,000007: # Assembler: yaYUL
061265,000008: # Contact: Jim Lawton <jim DOT lawton AT gmail DOT com>
061266,000009: # Website: www.ibiblio.org/apollo/index.html
061267,000010: # Page scans: www.ibiblio.org/apollo/ScansForConversion/Colossus237/
061268,000011: # Mod history: 2011-04-17 JL Adapted from corresponding Colossus 249 file.
061269,000012:
061270,000013: # # Page 1449
061271,000014: 7717 BLOCK 3
061272,000015: 6000 SETLOC FFTAG6
061273,000016: 6000 BANK
061274,000017: 7717 COUNT 03/FLAG
061275,000018:
061276,000019: 7717 54001 UPENT2 TS L # WHICH FLAGWORD IS IT
061277,000020: 7720 74716 MASK OCT7
061278,000021: 7721 56001 XCH L # SAVE IN L FOR INDEXING
061279,000022:
061280,000023: 7722 75630 MASK OCT77770 # OBTAIN THE BIT INFORMATION
061281,000024: 7723 00004 INHINT # PREVENT INTERUPTS
061282,000025: 7724 54061 TS ITEMP1 # STORE THE BIT INFORMATION TEMPORARIALY
061283,000026:
061284,000027: 7725 50001 NDX L
061285,000028: 7726 40074 CS FLAGWRD0
061286,000029: 7727 70061 MASK ITEMP1
061287,000030: 7730 50001 NDX L
061288,000031: 7731 26074 ADS FLAGWRD0
061289,000032: 7732 00003 RELINT # RELEASE INTERUPT INHIBIT
061290,000033:
061291,000034: 7733 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
061292,000035: 7734 00002 TC Q # RETURN
061293,000036:
061294,000037: 7735 54001 DOWNENT2 TS L # WHICH FLAGWORD IS IT
061295,000038: 7736 74716 MASK OCT7
061296,000039: 7737 56001 XCH L # SAVE IN L FOR INDEXING
061297,000040:
061298,000041: 7740 75630 MASK OCT77770 # OBTAIN THE BIT INFORMATION
061299,000042: 7741 40000 COM # START TO PROCESS THE INFORMATION
061300,000043:
061301,000044: 7742 00004 INHINT # PREVENT INTERUPTS
061302,000045: 7743 50001 NDX L
061303,000046: 7744 70074 MASK FLAGWRD0
061304,000047: 7745 50001 NDX L
061305,000048: 7746 54074 TS FLAGWRD0
061306,000049: 7747 00003 RELINT # RELEASE INTERUPT INHIBIT
061307,000050:
061308,000051: 7750 24002 INCR Q # OBTAIN THE CORRECT RETURN ADDRESS
061309,000052: 7751 00002 TC Q # RETURN
061310,000053:
061311,000054: 7752 4716 OCT7 EQUALS SEVEN
061312,000055: 10,3671 BANK 10
061313,000056:
061314,000057: # # Page 1450
061315,000058: # UPFLAG AND DOWNFLAG ARE ENTIRELY GENERAL FLAG SETTING AND CLEARING SUBROUTINES. USING THEM, WHETHER OR
061316,000059: # NOT IN INTERRUPT, ONE MAY SET OR CLEAR ANY SINGLE, NAMED BIT IN ANY ERASABLE REGISTER, SUBJECT OF COURSE TO
061317,000060: # EBANK SETTING. A "NAMED" BIT, AS THE WORD IS USED HERE, IS ANY BIT WITH A NAME FORMALLY ASSIGNED BY THE YUL
061318,000061: # ASSEMBLER.
061319,000062:
061320,000063: # AT PRESENT THE ONLY NAMED BITS ARE THOSE IN THE FLAGWORDS. ASSEMBLER CHANGES WILL MAKE IT POSSIBLE TO
061321,000064: # NAME ANY BIT IN ERASABLE MEMORY.
061322,000065:
061323,000066: # CALLING SEQUENCES ARE AS FOLLOWS:-
061324,000067:
061325,000068: # TC UPFLAG TC DOWNFLAG
061326,000069: # ADRES NAME OF FLAG ADRES NAME OF FLAG
061327,000070:
061328,000071: # RETURN IS TO THE LOCATION FOLLOWING THE "ADRES" ABOUT .58 MS AFTER THE "TC".
061329,000072:
061330,000073: # UPON RETURN A CONTAINS THE CURRENT FLAGWRD SETTING.
061331,000074:
061332,000075: 5435 BLOCK 02
061333,000076: 4000 SETLOC FFTAG1
061334,000077: 4000 BANK
061335,000078: 5435 COUNT* $$/FLAG
061336,000079:
061337,000080: 5435 30002 UPFLAG CA Q
061338,000081: 5436 05453 TC DEBIT
061339,000082: 5437 40000 COM # +(15 - BIT)
061340,000083: 5440 00006 EXTEND
061341,000084: 5441 04001 ROR LCHAN # SET BIT
061342,000085: 5442 50061 COMFLAG INDEX ITEMP1
061343,000086: 5443 54074 TS FLAGWRD0
061344,000087: 5444 22063 LXCH ITEMP3
061345,000088: 5445 00003 RELINT
061346,000089: 5446 00001 TC L
061347,000090:
061348,000091:
061349,000092: 5447 30002 DOWNFLAG CA Q
061350,000093: 5450 05453 TC DEBIT
061351,000094: 5451 70001 MASK L # RESET BIT
061352,000095: 5452 15442 TCF COMFLAG
061353,000096:
061354,000097:
061355,000098: 5453 64712 DEBIT AD ONE # GET DE BITS
061356,000099: 5454 00004 INHINT
061357,000100: 5455 54063 TS ITEMP3
061358,000101: 5456 34721 CA LOW4 # DEC15
061359,000102: 5457 54061 TS ITEMP1
061360,000103: 5460 50063 INDEX ITEMP3
061361,000104: 5461 27777 CA 0 -1 # ADRES
061362,000105: 5462 54001 TS L
061363,000106: 5463 34714 CA ZERO
061364,000107: # # Page 1451
061365,000108: 5464 00006 EXTEND
061366,000109: 5465 10061 DV ITEMP1 # A = FLAGWRD, L = (15 - BIT)
061367,000110: 5466 52062 DXCH ITEMP1
061368,000111: 5467 50061 INDEX ITEMP1
061369,000112: 5470 30074 CA FLAGWRD0
061370,000113: 5471 54001 TS L # CURRENT STATE
061371,000114: 5472 50062 INDEX ITEMP2
061372,000115: 5473 44674 CS BIT15 # -(15 - BIT)
061373,000116: 5474 00002 TC Q
061374,000117:
061375,000118: # # Page 1452
061376,000119: # DELAYJOB- A GENERAL ROUTINE TO DELAY A JOB A SPECIFIC AMOUNT OF TIME BEFORE PICKING UP AGAIN.
061377,000120:
061378,000121: # ENTRANCE REQUIREMENTS...
061379,000122: # CAF DT DELAY JOB FOR DT CENTISECS
061380,000123: # TC BANKCALL
061381,000124: # CADR DELAYJOB
061382,000125:
061383,000126: 06,3651 BANK 06
061384,000127: 00,2000 SETLOC DLAYJOB
061385,000128: 00,2000 BANK
061386,000129:
061387,000130: # THIS MUST REMAIN IN BANK 0 *****************************************
061388,000131: 00,3730 COUNT 00/DELAY
061389,000132:
061390,000133: 00,3730 00004 DELAYJOB INHINT
061391,000134: 00,3731 54002 TS Q # STORE DELAY DT IN Q FOR DLY -1 IN
061392,000135:
061393,000136: 00,3732 36214 CAF DELAYNUM # WAITLIST
061394,000137: 00,3733 54070 DELLOOP TS RUPTREG1
061395,000138: 00,3734 50000 INDEX A
061396,000139: 00,3735 31141 CA DELAYLOC # IS THIS DELAYLOC AVAILABLE
061397,000140: 00,3736 00006 EXTEND
061398,000141: 00,3737 13744 BZF OK2DELAY # YES
061399,000142:
061400,000143: 00,3740 10070 CCS RUPTREG1 # NO, TRY NEXT DELAYLOC
061401,000144: 00,3741 13733 TCF DELLOOP
061402,000145:
061403,000146: 00,3742 05604 TC BAILOUT # NO AVAILABLE LOCS AVAILABLE.
061404,000147: 00,3743 01104 OCT 1104
061405,000148:
061406,000149: 00,3744 33764 OK2DELAY CA TCSLEEP # SET WAITLIST IMMEDIATE RETURN
061407,000150: 00,3745 54061 TS WAITEXIT
061408,000151:
061409,000152: 00,3746 30004 CA FBANK
061410,000153: 00,3747 60070 AD RUPTREG1 # STORE BBANK FOR TASK CALL
061411,000154: 00,3750 54001 TS L
061412,000155:
061413,000156: 00,3751 33765 CAF WAKECAD # STORE CADR FOR TASK CALL
061414,000157: 00,3752 15146 TCF DLY2 -1 # DLY IS IN WAITLIST ROUTINE
061415,000158:
061416,000159: 00,3753 04604 TCGETCAD TC MAKECADR # GET CALLERS FCADR
061417,000160:
061418,000161: 00,3754 50070 INDEX RUPTREG1
061419,000162: 00,3755 55141 TS DELAYLOC # SAVE DELAY CADRS
061420,000163:
061421,000164: 00,3756 05070 TC JOBSLEEP
061422,000165:
061423,000166: 00,3757 34714 WAKER CAF ZERO
061424,000167: 00,3760 50006 INDEX BBANK
061425,000168: 00,3761 57141 XCH DELAYLOC # MAKE DELAYLOC AVAILABLE
061426,000169: # # Page 1453
061427,000170: 00,3762 05074 TC JOBWAKE
061428,000171:
061429,000172: 00,3763 05213 TC TASKOVER
061430,000173:
061431,000174: 00,3764 03751 TCSLEEP GENADR TCGETCAD -2
061432,000175: 00,3765 03757 WAKECAD GENADR WAKER
061433,000176:
061434,000177: # # Page 1454
061435,000178: # GENTRAN, A BLOCK TRANSFER ROUTINE.
061436,000179:
061437,000180: # WRITTEN BY D. EYLES
061438,000181: # MOD 1 BY KERNAN UTILITYM REV 17 11/18/67
061439,000182:
061440,000183: # MOD 2 BY SCHULENBERG (REMOVE RELINT) SKIPPER REV 4 2/28/68
061441,000184:
061442,000185: # THIS ROUTINE IS USEFUL FOR TRANSFERRING N CONSECUTIVE ERASABLE OR FIXED QUANTITIES TO SOME OTHER N
061443,000186: # CONSECUTIVE ERASABLE LOCATIONS. IF BOTH BLOCKS OF DATA ARE IN SWITCHABLE EBANKS, THEY MUST BE IN THE SAME ONE.
061444,000187:
061445,000188: # GENTRAN IS CALLABLE IN A JOB AS WELL AS A RUPT. THE CALLING SEQUENCE IS:
061446,000189:
061447,000190: # I CA N-1 # OF QUANTITIES MINUS ONE.
061448,000191: # I +1 TC GENTRAN IN FIXED-FIXED.
061449,000192: # I +2 ADRES L STARTING ADRES OF DATA TO BE MOVED.
061450,000193: # I +3 ADRES M STARTING ADRES OF DUPLICATION BLOCK.
061451,000194: # I +4 RETURNS HERE.
061452,000195:
061453,000196: # GENTRAN TAKES 25 MCT'S (300 MICROSECONDS) PER ITEM + 5 MCT'S (60 MICS) FOR ENTERING AND EXITING.
061454,000197:
061455,000198: # A, L AND ITEMP1 ARE NOT PRESERVED.
061456,000199:
061457,000200: 5475 BLOCK 02
061458,000201: 4000 SETLOC FFTAG4
061459,000202: 4000 BANK
061460,000203:
061461,000204: 5475 0061 EBANK= ITEMP1
061462,000205:
061463,000206: 5475 COUNT* $$/TRAN
061464,000207:
061465,000208: 5475 00004 GENTRAN INHINT
061466,000209: 5476 54061 TS ITEMP1 # SAVE N-1.
061467,000210: 5477 50002 INDEX Q # C(Q) = ADRES L.
061468,000211: 5500 60000 AD 0 # ADRES (L + N - 1).
061469,000212: 5501 50000 INDEX A
061470,000213: 5502 30000 CA 0 # C(ABOVE).
061471,000214: 5503 54001 TS L # SAVE DATA.
061472,000215: 5504 30061 CA ITEMP1
061473,000216: 5505 50002 INDEX Q
061474,000217: 5506 60001 AD 1 # ADRES (M + N - 1).
061475,000218: 5507 50000 INDEX A
061476,000219: 5510 22000 LXCH 0 # STUFF IT.
061477,000220: 5511 10061 CCS ITEMP1 # LOOP UNTIL N-1 = 0.
061478,000221: 5512 15476 TCF GENTRAN +1
061479,000222: 5513 16710 TCF Q+2 # RETURN TO CALLER.
061480,000223:
061481,000224: # # Page 1455
061482,000225: # B5OFF ZERO BIT 5 OF EXTVBACT, WHICH IS SET BY TESTXACT.
061483,000226:
061484,000227: # MAY BE USED AS NEEDED BY ANY EXTENDED VERB WHICH HAS DONE TESTXACT
061485,000228:
061486,000229: 5514 COUNT* $$/EXTVB
061487,000230:
061488,000231: 5514 44706 B5OFF CS BIT5
061489,000232: 5515 71044 MASK EXTVBACT
061490,000233: 5516 55044 TS EXTVBACT
061491,000234: 5517 05112 TC ENDOFJOB
061492,000235:
061493,000236: # # Page 1456
061494,000237: # SUBROUTINES TO TURNOFF AND TURN ON TRACKER FAIL LIGHT.
061495,000238:
061496,000239: 5520 00004 TRFAILOF INHINT
061497,000240: 5521 47704 CS OCT40200 # TURN OFF TRACKER LIGHT
061498,000241: 5522 71036 MASK DSPTAB +11D
061499,000242: 5523 64674 AD BIT15
061500,000243: 5524 55036 TS DSPTAB +11D
061501,000244: 5525 41331 CS OPTMODES # TO INSURE THAT OCDU FAIL WILL GO ON
061502,000245: 5526 74704 MASK BIT7 # AGAIN IF IT WAS ON IN ADDITION TO
061503,000246: 5527 27331 ADS OPTMODES # TRACKER FAIL.
061504,000247:
061505,000248: 5530 00003 REQ RELINT
061506,000249: 5531 00002 TC Q
061507,000250:
061508,000251: 5532 00004 TRFAILON INHINT
061509,000252: 5533 41036 CS DSPTAB +11D # TURN ON
061510,000253: 5534 77704 MASK OCT40200
061511,000254: 5535 27036 ADS DSPTAB +11D
061512,000255: 5536 15530 TCF REQ
End of include-file SERVICE_ROUTINES.agc. Parent file is MAIN.agc