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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041473,000002: ## Copyright: Public domain.
041474,000003: ## Filename: TVCMASSPROP.agc
041475,000004: ## Purpose: A section of Comanche revision 051.
041476,000005: ## It is part of the reconstructed source code for the
041477,000006: ## original release of the flight software for the Command
041478,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 11.
041479,000008: ## The code has been recreated from a copy of Comanche 055. It
041480,000009: ## has been adapted such that the resulting bugger words
041481,000010: ## exactly match those specified for Comanche 51 in NASA drawing
041482,000011: ## 2021153D, which gives relatively high confidence that the
041483,000012: ## reconstruction is correct.
041484,000013: ## Reference: pp. 951-955
041485,000014: ## Assembler: yaYUL
041486,000015: ## Contact: Ron Burkey <info@sandroid.org>.
041487,000016: ## Website: www.ibiblio.org/apollo/index.html
041488,000017: ## Mod history: 2019-07-30 MAS Created from Comanche 55.
041489,000018:
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Page 951
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041491,000020: # PROGRAM NAME....MASSPROP
041492,000021: # LOG SECTION....TVCMASSPROP PROGRAMMER...MELANSON (ENGEL, SCHLUNDT)
041493,000022:
041494,000023: # FUNCTIONAL DESCRIPTION:
041495,000024:
041496,000025: # MASSPROP OPERATES IN TWO MODES: (1) IF LEM MASS OR CONFIGURATION ARE UPDATED (MASSPROP DOES NOT TEST
041497,000026: # FOR THIS) THE ENTIRE PROGRAM MUST BE RUN THROUGH, BREAKPOINT VALUES AND DERIVATIVES OF THE OUTPUTS WITH
041498,000027: # RESPECT TO CSM MASS BEING CALCULATED PRIOR TO CALCULATION OF THE OUTPUTS. (2) OTHERWISE, THE OUTPUTS CAN BE
041499,000028: # CALCULATED USING PREVIOUSLY COMPUTED BREAKPOINT VALUES AND DERIVATIVES.
041500,000029:
041501,000030: # CALLING SEQUENCES
041502,000031:
041503,000032: # IF LEM MASS OR CONFIGURATION HAS BEEN UPDATED, TRANSFER TO MASSPROP, OTHERWISE TRANSFER TO FIXCW.
041504,000033: # L TC BANKCALL OR IBNKCALL
041505,000034: # L+1 CADR MASSPROP
041506,000035: # OR
041507,000036: # L+1 CADR FIXCW
041508,000037: # L+2 RETURNS VIA Q
041509,000038:
041510,000039: # CALLED IN PARTICULAR BY DONOUN47 (JOB) AND TVCEXECUTIVE (TASK)
041511,000040:
041512,000041: # JOBS OR TASKS INITIATED - NONE
041513,000042:
041514,000043: # SUBROUTINES CALLED - NONE
041515,000044:
041516,000045: # ERASABLE INITIALIZATION REQUIRED
041517,000046:
041518,000047: # LEMMASS MUST CONTAIN LEM MASS SCALED AT B+16 IN KILOGRAMS
041519,000048: # CSMMASS MUST CONTAIN CSM MASS SCALED AT B+16 IN KILOGRAMS
041520,000049: # DAPDATR1 MUST BE SET TO INDICATE VEHICLE CONFIGURATION.
041521,000050: # BITS (15,14,13) = ( 0 , 0 , 1 ) LEM OFF
041522,000051: # ( 0 , 1 , 0 ) LEM ON (ASCNT,DSCNT)
041523,000052: # ( 1 , 1 , 0 ) LEM ON (ASCNT ONLY)
041524,000053:
041525,000054: # ALARMS - NONE
041526,000055:
041527,000056: # EXIT - TC Q
041528,000057:
041529,000058: # OUTPUTS:
041530,000059:
041531,000060: # (1) IXX, SINGLE PRECISION SCALED AT B+20 IN KG-M SQ.
041532,000061: # (2) IAVG, SINGLE PRECISION SCALED AT B+20 IN KG-M SQ.
041533,000062: # (3) IAVG/TLX, SINGLE PRECISION, SCALED AT B+2 SEC-SQD
041534,000063: #
041535,000064: # THEY ARE STORED IN CONSECUTIVE REGISTERS IXX0, IXX1, IXX2
041536,000065: # CONVERSION FACTOR: (SLUG-FTSQ) = 0.737562 (KG-MSQ)
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Page 952
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041538,000067:
041539,000068: # OUTPUTS ARE CALCULATED AS FOLLOWS:
041540,000069:
041541,000070: # (1) IF LEM DOCKED, LEMMASS IS FIRST ELIMINATED AS A PARAMETER
041542,000071:
041543,000072: # VARST0 = INTVALUE0 + LEMMASS(SLOPEVAL0) IXX BREAKPOINT VALUE
041544,000073: # VARST1 = INTVALUE1 + LEMMASS(SLOPEVAL1) IAVG BREAKPOINT VALUE
041545,000074: # VARST2 = INTVALUE2 + LEMMASS(SLOPEVAL2) IAVG/TLX BREAKPOINT VALUE
041546,000075:
041547,000076: # VARST3 = INTVALUE3 + LEMMASS(SLOPEVAL3) IAVG/TLX SLOPE FOR CSMMASS > 33956 LBS (SPS > 10000 LBS)
041548,000077: # VARST4 = INTVALUE4 + LEMMASS(SLOPEVAL4) IAVG SLOPE FOR CSMMASS > 33956 LBS (SPS > 10000 LBS)
041549,000078:
041550,000079: # VARST5 = INTVALUE5 + LEMMASS(SLOPEVAL5) IXX SLOPE FOR ALL VALUES OF CSMMASS
041551,000080:
041552,000081: # VARST6 = INTVALUE6 + LEMMASS(SLOPEVAL6) IAVG SLOPE FOR CSMMASS < 33956 LBS (SPS < 10000 LBS)
041553,000082: # VARST7 = INTVALUE7 + LEMMASS(SLOPEVAL7) IAVG/TLX SLOPE FOR CSMMASS < 33956 LBS (SPS < 10000 LBS)
041554,000083:
041555,000084: # VARST8 = INTVALUE8 + LEMMASS(SLOPEVAL8) IAVG DECREMENT TO BRKPT VALUE WHEN LEM DSCNT STAGE OFF
041556,000085: # VARST9 = INTVALUE9 + LEMMASS(SLOPEVAL9) IAVG/TLX DECREMENT TO BRKPT VALUE WHEN LEM DSCNT STAGE OFF
041557,000086:
041558,000087: # (2) IF LEM NOT DOCKED
041559,000088:
041560,000089: # VARST0 = NOLEMVAL0 WHERE THE MEANING AND SCALING OF VARST0
041561,000090: # . . TO VARST9 ARE THE SAME AS GIVEN ABOVE
041562,000091: # . .
041563,000092: # . . NOTE... FOR THIS CASE, VARST8,9 HAVE NO
041564,000093: # VARST9 = NOLEMVAL9 MEANING (THEY ARE COMPUTED BUT NOT USED)
041565,000094:
041566,000095: # (3) THE FINAL OUTPUT CALCULATIONS ARE THEN DONE
041567,000096:
041568,000097: # IXX0 = VARST0 + (CSMMASS + NEGBPW)VARST5 IXX
041569,000098:
041570,000099: # IXX1 = VARST1 + (CSMMASS + NEGBPW)VARST(4 OR 6) IAVG
041571,000100:
041572,000101: # IXX2 = VARST2 + (CSMMASS + NEGBPW)VARST(3 OR 7) IAVG/TLX
041573,000102:
041574,000103: # THE DATA USED CAME FROM CSM/LM SPACECRAFT OPERATIONAL DATA BOOK.
041575,000104: # VOL. 3, NASA DOCUMENT SNA-8-D-027 (MARCH 1968)
041576,000105:
041577,000106: # PERTINENT MASS DATA: CSM WEIGHT (FULL) 64100 LBS
041578,000107: # (EMPTY) 23956 LBS
041579,000108: # LEM WEIGHT (FULL) 32000 LBS
041580,000109: # (EMPTY) 14116 LBS
041581,000110:
041582,000111: # (WEIGHTS ARE FROM AMENDMENT #1 (APRIL 24, 1968) TO ABOVE DATA BOOK)
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Page 953
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041584,000113:
041585,000114: 25,3774 BANK 25
041586,000115: 05,2000 SETLOC DAPMASS
041587,000116: 05,2000 BANK
041588,000117: 05,3366 E6,1702 EBANK= BZERO
041589,000118: 05,3366 COUNT* $$/MASP
041590,000119:
041591,000120: 05,3366 34334 MASSPROP CAF NINE # MASSPROP USES TVC/RCS INTERUPT TEMPS
041592,000121: 05,3367 55506 TS PHI333 # SET UP TEN PASSES
041593,000122:
041594,000123: 05,3370 31466 LEMTEST CAE DAPDATR1 # DETERMINE LEM STATUS
041595,000124: 05,3371 75003 MASK BIT13
041596,000125: 05,3372 00006 EXTEND
041597,000126: 05,3373 13377 BZF LEMYES
041598,000127:
041599,000128: 05,3374 51506 LEMNO INDEX PHI333 # LEM NOT ATTACHED
041600,000129: 05,3375 33463 CAF NOLEMVAL
041601,000130: 05,3376 13407 TCF STOINST
041602,000131:
041603,000132: 05,3377 31473 LEMYES CAE LEMMASS # LEM IS ATTACHED
041604,000133: 05,3400 60000 DOUBLE
041605,000134: 05,3401 00006 EXTEND
041606,000135: 05,3402 51506 INDEX PHI333
041607,000136: 05,3403 73505 MP SLOPEVAL
041608,000137: 05,3404 20001 DDOUBL
041609,000138: 05,3405 51506 INDEX PHI333
041610,000139: 05,3406 63473 AD INTVALUE
041611,000140:
041612,000141: 05,3407 51506 STOINST INDEX PHI333 # STORAGE INST BEGIN HERE
041613,000142: 05,3410 55511 TS VARST0
041614,000143: 05,3411 11506 CCS PHI333 # ARE ALL TEN PASSES COMPLETED
041615,000144: 05,3412 13367 TCF MASSPROP +1 # NO - GO DECREMENT PHI333
041616,000145:
041617,000146: 05,3413 11466 DXTEST CCS DAPDATR1 # IF NEG, BIT15 IS 1, LEM DSCNT STAGE OFF
041618,000147: 05,3414 13422 TCF FIXCW
041619,000148: 05,3415 13422 TCF FIXCW
041620,000149: 05,3416 53522 DXCH VARST0 +8D
041621,000150: 05,3417 21513 DAS VARST0 +1
041622,000151: 05,3420 33520 CA DXITFIX
041623,000152: 05,3421 27520 ADS VARST0 +7
041624,000153:
041625,000154: 05,3422 35016 FIXCW CAF BIT2 # COMPUTATION PHASE BEGINS HERE. SET UP
041626,000155: 05,3423 55506 TS PHI333 # THREE PASSES
041627,000156: 05,3424 55507 TS PSI333
041628,000157:
041629,000158: 05,3425 31474 CAE CSMMASS # GET DELTA CSM WEIGHT - SIGN DETERMINES
041630,000159: 05,3426 63517 AD NEGBPW # SLOPE LOCATIONS.
041631,000160: 05,3427 60000 DOUBLE
041632,000161: 05,3430 55510 TS TEMP333
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Page 954
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041634,000163: 05,3431 00006 EXTEND
041635,000164: 05,3432 63435 BZMF PEGGY # DETERMINE CORRECT SLOPE
041636,000165: 05,3433 37715 CAF NEG2
041637,000166: 05,3434 55506 TS PHI333
041638,000167:
041639,000168: 05,3435 51506 PEGGY INDEX PHI333 # ALL IS READY - CALCULATE OUTPUTS NOW
041640,000169: 05,3436 31516 CAE VARST5 # GET SLOPE
041641,000170: 05,3437 00006 EXTEND
041642,000171: 05,3440 71510 MP TEMP333 # MULT BY DELTA CSM WEIGHT
041643,000172: 05,3441 60000 DOUBLE
041644,000173: 05,3442 51507 INDEX PSI333
041645,000174: 05,3443 61511 AD VARST0 # ADD BREAKPOINT VALUE
041646,000175: 05,3444 51507 INDEX PSI333
041647,000176: 05,3445 55470 TS IXX # ****** OUTPUTS (IXX0, IXX1, IXX2) ******
041648,000177:
041649,000178: 05,3446 11507 CCS PSI333 # BOOKKEEPING - MASSPROP FINISHED OR NOT
041650,000179: 05,3447 13457 TCF BOKKEP2 # NO - GO TAKE CARE OF INDEXING REGISTERS
041651,000180:
041652,000181: 05,3450 31466 CAE DAPDATR1 # UPDATE WEIGHT/G
041653,000182: 05,3451 75002 MASK BIT14
041654,000183: 05,3452 10000 CCS A
041655,000184: 05,3453 31473 CA LEMMASS
041656,000185: 05,3454 61474 AD CSMMASS
041657,000186: 05,3455 55475 TS WEIGHT/G # SCALED AT B+16 IN KILOGRAMS
041658,000187: 05,3456 00002 ENDMASSP TC Q
041659,000188:
041660,000189: 05,3457 55507 BOKKEP2 TS PSI333 # REDUCE PSI BY ONE
041661,000190: 05,3460 00006 EXTEND
041662,000191: 05,3461 27506 DIM PHI333
041663,000192: 05,3462 13435 TCF PEGGY
041664,000193:
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Page 955
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041666,000195: 05,3463 00616 NOLEMVAL DEC 25445 B-20
041667,000196: 05,3464 02526 DEC 87450 B-20
041668,000197: 05,3465 02352 DEC .30715 B-2
041669,000198: 05,3466 01471 DEC 1.22877 E-5 B+12
041670,000199: 05,3467 00634 DEC 1.6096 B-6
041671,000200: 05,3470 00612 DEC 1.54 B-6
041672,000201: 05,3471 03706 DEC 7.77177 B-6
041673,000202: 05,3472 04425 DEC 3.46458 E-5 B+12
041674,000203:
041675,000204: 05,3473 00644 INTVALUE DEC 26850 B-20
041676,000205: 05,3474 03710 DEC 127518 B-20
041677,000206: 05,3475 04246 DEC .54059 B-2
041678,000207: 05,3476 02011 DEC .153964 E-4 B+12
041679,000208: 05,3477 77501 DEC -.742923 B-6
041680,000209: 05,3500 00612 DEC 1.5398 B-6
041681,000210: 05,3501 04656 DEC 9.68 B-6
041682,000211: 05,3502 10372 DEC .647625 E-4 B+12
041683,000212: 05,3503 77126 DEC -27228 B-20
041684,000213: 05,3504 76261 DEC -.206476 B-2
041685,000214:
041686,000215: 05,3505 00767 SLOPEVAL DEC 1.96307 B-6
041687,000216: 05,3506 15624 DEC 27.5774 B-6
041688,000217: 05,3507 03054 DEC 2.3548 E-5 B+12
041689,000218: 05,3510 04532 DEC 2.1777 E-9 B+26
041690,000219: 05,3511 10433 DEC 1.044 E-3 B+8
041691,000220: 05,3512 00000 DEC 0 B-14
041692,000221: 05,3513 22070 DEC 2.21068 E-3 B+8
041693,000222: 05,3514 03204 DEC 1.5166 E-9 B+26
041694,000223: 05,3515 77266 DEC -1.284 B-6
041695,000224: 05,3516 02476 DEC 2 E-5 B+12
041696,000225:
041697,000226: 05,3517 70364 NEGBPW DEC -15402.17 B-16
041698,000227: 05,3520 75420 DXITFIX DEC* -1.88275 E-5 B+12*
041699,000228:
End of include-file TVCMASSPROP.agc. Parent file is MAIN.agc