Source Code
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These source-code files were derived from scans of the
Colossus 237 (Apollo 8 Command Module) program listing from the private collection of original
AGC developer Fred Martin. Scanning was by Ron Burkey. Pre-existing Colossus 249
(Apollo 9 CM) source files were used as a template, and changes between Colossus 249
and Colossus 237 were manually transcribed by a team of volunteers. 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, 1968Note that the date is the date of the printout, not the date of the program revision. |
021449,000002: ## Copyright: Public domain.
021450,000003: ## Filename: R31.agc
021451,000004: ## Purpose: Part of the source code for Colossus build 237.
021452,000005: ## This is for the Command Module's (CM) Apollo Guidance
021453,000006: ## Computer (AGC), for Apollo 8.
021454,000007: ## Assembler: yaYUL
021455,000008: ## Contact: Jim Lawton <jim DOT lawton AT gmail DOT com>
021456,000009: ## Website: www.ibiblio.org/apollo/index.html
021457,000010: ## Page Scans: www.ibiblio.org/apollo/ScansForConversion/Colossus237/
021458,000011: ## Mod history: 2011-02-05 JL Adapted from corresponding Colossus 249 file.
021459,000012: ## 2016-12-31 RSB Proofed comment text using octopus/ProoferComments,
021460,000013: ## and corrected errors found.
021461,000014:
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Page 494 |
021463,000016: 34,2002 BANK 34
021464,000017: 35,2000 SETLOC R31
021465,000018: 35,2000 BANK
021466,000019:
021467,000020: 35,3150 COUNT* $$/R31
021468,000021:
021469,000022: 35,3150 34752 R31CALL CAF PRIO3
021470,000023: 35,3151 05042 TC FINDVAC
021471,000024: 35,3152 E4,1770 EBANK= SUBEXIT
021472,000025: 35,3152 03204 72064 2CADR V83CALL
021473,000026:
021474,000027: 35,3154 34734 DSPDELAY CAF 1SEC
021475,000028: 35,3155 04555 TC BANKCALL
021476,000029: 35,3156 01730 CADR DELAYJOB
021477,000030: 35,3157 31044 CA EXTVBACT
021478,000031: 35,3160 74677 MASK BIT12
021479,000032: 35,3161 00006 EXTEND
021480,000033: 35,3162 13154 BZF DSPDELAY
021481,000034:
021482,000035: 35,3163 30105 DISPN5X CA FLAGWRD9 # TEST R31FLAG (IN SUNDANCE R31FLAG WILL
021483,000036: 35,3164 74707 MASK BIT4 # ALWAYS BE SET AS R34 DOES NOT EXIST)
021484,000037: 35,3165 00006 EXTEND
021485,000038: 35,3166 13171 BZF +3
021486,000039: 35,3167 33310 CAF V16N54 # R31 USE NOUN 54
021487,000040: 35,3170 03172 TC +2
021488,000041: 35,3171 33311 CAF V16N53 # R34 USE NOUN 53
021489,000042: 35,3172 04555 TC BANKCALL
021490,000043: 35,3173 20465 CADR GOMARKF
021491,000044: 35,3174 05514 TC B5OFF
021492,000045: 35,3175 05514 TC B5OFF
021493,000046: 35,3176 13163 TCF DISPN5X
021494,000047:
021495,000048: 35,3177 06006 V83 TC INTPRET
021496,000049: 35,3200 77624 CALL
021497,000050: 35,3201 73426 REDOEXTP
021498,000051: 35,3202 77650 GOTO
021499,000052: 35,3203 73207 COMPDISP
021500,000053: 35,3204 06006 V83CALL TC INTPRET
021501,000054: 35,3205 77624 CALL
021502,000055: 35,3206 73312 STATEXTP # EXTRAPOLATE STATE VECTORS
021503,000056: 35,3207 52375 COMPDISP VLOAD VSU
021504,000057: 35,3210 00001 RATT
021505,000058: 35,3211 02327 RONE
021506,000059: 35,3212 51406 PUSH ABVAL # RATT-RONE TO 0D PD= 6
021507,000060: 35,3213 02321 STORE RANGE # METERS B-29
021508,000061: 35,3214 77301 NORM VLOAD
021509,000062: 35,3215 00047 X1 # RATT-RONE PD= 0
021510,000063: 35,3216 77762 VSR1
021511,000064: 35,3217 53457 VSL* UNIT
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021513,000066: 35,3220 20201 0,1
021514,000067: 35,3221 52315 PDVL VSU # UNIT(LOS) TO 0D PD= 6
021515,000068: 35,3222 00007 VATT
021516,000069: 35,3223 02335 VONE
021517,000070: 35,3224 77641 DOT # (VATT-VONE).UNIT(LOS) PD= 0
021518,000071: 35,3225 77752 SL1
021519,000072: 35,3226 36323 STCALL RRATE # RANGE RATE M/CS B-7
021520,000073: 35,3227 47432 CDUTRIG # TO INITIALIZE FOR *NBSM*
021521,000074: 35,3230 77624 CALL
021522,000075: 35,3231 62000 R34LOS # NOTE. PDL MUST = 0.
021523,000076: 35,3232 53575 R34ANG VLOAD UNIT
021524,000077: 35,3233 02327 RONE
021525,000078: 35,3234 77715 PDVL # UR TO 0D PD= 6
021526,000079: 35,3235 15330 THISAXIS # UNITX FOR CM, UNITZ FOR LM
021527,000080: 35,3236 77214 BON VLOAD # CHK R31FLAG. ON=R31 THETA, OFF=R34 PHI
021528,000081: 35,3237 04713 R31FLAG
021529,000082: 35,3240 73242 +2 # R31-THETA
021530,000083: 35,3241 00015 12D
021531,000084: 35,3242 77624 CALL
021532,000085: 35,3243 47601 *NBSM*
021533,000086: 35,3244 41505 VXM PUSH # UXORZ TO 6D PD=12D
021534,000087: 35,3245 01736 REFSMMAT
021535,000088: 35,3246 72431 VPROJ VSL2
021536,000089: 35,3247 00001 0D
021537,000090: 35,3250 53445 BVSU UNIT
021538,000091: 35,3251 00007 6D
021539,000092: 35,3252 47315 PDVL VXV # UP/2 TO 12D PD=18D
021540,000093: 35,3253 02327 RONE
021541,000094: 35,3254 02335 VONE
021542,000095: 35,3255 47256 UNIT VXV
021543,000096: 35,3256 02327 RONE
021544,000097: 35,3257 63241 DOT PDVL # SIGN TO 12D, UP/2 TO MPAC PD=18D
021545,000098: 35,3260 00015 12D
021546,000099: 35,3261 50372 VSL1 DOT # UP.UXORZ
021547,000100: 35,3262 00007 6D
021548,000101: 35,3263 72565 SIGN SL1
021549,000102: 35,3264 00015 12D
021550,000103: 35,3265 77726 ACOS
021551,000104: 35,3266 26325 STOVL RTHETA
021552,000105: 35,3267 02327 RONE
021553,000106: 35,3270 51041 DOT BPL
021554,000107: 35,3271 00007 6D
021555,000108: 35,3272 73277 +5
021556,000109: 35,3273 44345 DLOAD BDSU # IF UXORZ.R NEG, RTHETA = 1 - RTHETA
021557,000110: 35,3274 02325 RTHETA
021558,000111: 35,3275 15340 DPPOSMAX
021559,000112: 35,3276 02325 STORE RTHETA # RTHETA BETWEEN 0 AND 1 REV.
021560,000113: 35,3277 77776 EXIT
021561,000114: 35,3300 34706 CAF BIT5 # HAVE WE BEEN ANSWERED
021562,000115: 35,3301 71044 MASK EXTVBACT
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021564,000117: 35,3302 00006 EXTEND
021565,000118: 35,3303 15423 BZF ENDEXT # YES, DIE
021566,000119:
021567,000120: 35,3304 41044 CS EXTVBACT
021568,000121: 35,3305 74677 MASK BIT12
021569,000122: 35,3306 27044 ADS EXTVBACT
021570,000123:
021571,000124: 35,3307 13177 TCF V83
021572,000125: 35,3310 04066 V16N54 VN 1654
021573,000126: 35,3311 04065 V16N53 VN 1653
021574,000127:
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021576,000129: # THE STATEXTP SUBROUTINE DOES A PRECISION EXTRAPOLATION OF BOTH VEHICLES
021577,000130: # STATE VECTORS TO PRESENT TIME AND SAVES THEM AS BASE VECTORS.
021578,000131: # IF SERVICER IS OFF ---
021579,000132: # THIS VEHICLES BASE VECTOR IS CONIC EXTRAPOLATED TO
021580,000133: # PRESENT TIME AND SAVED AS RONE, VONE.
021581,000134: # THE OTHER VEHICLES BASE VECTOR IS CONIC EXTRAPOLATED
021582,000135: # TO THE SAME TIME, THE OUTPUT BEING LEFT IN RATT, VATT.
021583,000136: # IF SERVICER IS ON ---
021584,000137: # RONE, VONE ARE SET EQUAL TO RN, VN AND THE OTHER
021585,000138: # VEHICLES STATE VECTOR IS PREC. EXTRAPOLATED TO PIPTIME.
021586,000139: 35,3312 47020 STATEXTP STQ RTB
021587,000140: 35,3313 02274 STATEXIT
021588,000141: 35,3314 45505 LOADTIME
021589,000142: 35,3315 34041 STCALL TDEC1
021590,000143: 35,3316 27036 OTHPREC # GET BASE VECTORS
021591,000144: 35,3317 77775 VLOAD
021592,000145: 35,3320 00017 RATT1
021593,000146: 35,3321 26225 STOVL BASEOTP # OTHER POS.
021594,000147: 35,3322 00025 VATT1
021595,000148: 35,3323 16241 STODL BASEOTV # OTHER VEL.
021596,000149: 35,3324 00015 TAT
021597,000150: 35,3325 02272 STORE BASETIME
021598,000151: 35,3326 34041 STCALL TDEC1
021599,000152: 35,3327 27022 THISPREC
021600,000153: 35,3330 77775 VLOAD
021601,000154: 35,3331 00017 RATT1
021602,000155: 35,3332 26255 STOVL BASETHP # THIS POS.
021603,000156: 35,3333 00025 VATT1
021604,000157: 35,3334 02263 STORE BASETHV # THIS VEL
021605,000158: 35,3335 47014 HAVEBASE BON RTB
021606,000159: 35,3336 03711 V37FLAG
021607,000160: 35,3337 73413 GETRVN # IF AVG ON ,GET RN ETC.
021608,000161: 35,3340 45505 LOADTIME
021609,000162: 35,3341 34041 STCALL TDEC1 # BEGIN SET UP FOR CONIC EXTRAP. FOR THIS.
021610,000163: 35,3342 27371 INTSTALL
021611,000164: 35,3343 43175 VLOAD CLEAR
021612,000165: 35,3344 02255 BASETHP
021613,000166: 35,3345 00263 MOONFLAG
021614,000167: 35,3346 25535 STOVL RCV
021615,000168: 35,3347 02263 BASETHV
021616,000169: 35,3350 15543 STODL VCV
021617,000170: 35,3351 02272 BASETIME
021618,000171: 35,3352 43014 BOF SET # GET APPROPRIATE MOONFLAG SETTING
021619,000172: 35,3353 04343 MOONTHIS
021620,000173: 35,3354 73356 +2
021621,000174: 35,3355 00063 MOONFLAG
021622,000175: 35,3356 77614 SET
021623,000176: 35,3357 01473 INTYPFLG # CONIC EXTRAP.
021624,000177: 35,3360 35517 STCALL TET
021625,000178: 35,3361 27066 INTEGRVS # INTEGRATION --- AT LAST ---
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021627,000180: 35,3362 77775 VLOAD
021628,000181: 35,3363 00001 RATT
021629,000182: 35,3364 26327 STOVL RONE
021630,000183: 35,3365 00007 VATT
021631,000184: 35,3366 36335 STCALL VONE # GET SET FOR CONIC EXTRAP.,OTHER.
021632,000185: 35,3367 27371 INTSTALL
021633,000186: 35,3370 71214 SET DLOAD
021634,000187: 35,3371 01473 INTYPFLG
021635,000188: 35,3372 00015 TAT
021636,000189: 35,3373 00041 OTHINT STORE TDEC1
021637,000190: 35,3374 43175 VLOAD CLEAR
021638,000191: 35,3375 02225 BASEOTP
021639,000192: 35,3376 00263 MOONFLAG
021640,000193: 35,3377 25535 STOVL RCV
021641,000194: 35,3400 02241 BASEOTV
021642,000195: 35,3401 15543 STODL VCV
021643,000196: 35,3402 02272 BASETIME
021644,000197: 35,3403 43014 BOF SET
021645,000198: 35,3404 04343 MOONTHIS
021646,000199: 35,3405 73407 +2
021647,000200: 35,3406 00063 MOONFLAG
021648,000201: 35,3407 35517 STCALL TET
021649,000202: 35,3410 27066 INTEGRVS
021650,000203: 35,3411 77650 GOTO
021651,000204: 35,3412 02274 STATEXIT # THIS VEHICLES POS.,VEL. IN PUSHLIST.
021652,000205:
021653,000206: 35,3413 77775 GETRVN VLOAD
021654,000207: 35,3414 01171 RN
021655,000208: 35,3415 26327 STOVL RONE
021656,000209: 35,3416 01177 VN
021657,000210: 35,3417 16335 STODL VONE
021658,000211: 35,3420 01205 PIPTIME
021659,000212: 35,3421 77624 CALL
021660,000213: 35,3422 27371 INTSTALL
021661,000214: 35,3423 52014 CLEAR GOTO
021662,000215: 35,3424 01673 INTYPFLG # PREC EXTRAP FOR OTHER
021663,000216: 35,3425 73373 OTHINT
021664,000217:
021665,000218: 35,3426 52020 REDOEXTP STQ GOTO
021666,000219: 35,3427 02274 STATEXIT
021667,000220: 35,3430 73335 HAVEBASE
021668,000221: 31,2000 SETLOC R34
021669,000222: 31,2000 BANK
021670,000223: 31,2000 77776 R34LOS EXIT
021671,000224: 31,2001 30036 CA CDUS
021672,000225: 31,2002 50120 INDEX FIXLOC
021673,000226: 31,2003 54011 TS 9D
021674,000227: 31,2004 30035 CA CDUT
021675,000228: 31,2005 50120 INDEX FIXLOC
021676,000229: 31,2006 54013 TS 11D
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Page 499 |
021678,000231: 31,2007 30120 CA FIXLOC
021679,000232: 31,2010 66211 AD SIX
021680,000233: 31,2011 40000 COM
021681,000234: 31,2012 50120 INDEX FIXLOC
021682,000235: 31,2013 54046 TS X1
021683,000236: 31,2014 06006 TC INTPRET
021684,000237: 31,2015 77624 CALL
021685,000238: 31,2016 46000 SXTNB
021686,000239: 31,2017 34015 STCALL 12D
021687,000240: 31,2020 73232 R34ANG
End of include-file R31.agc. Parent file is MAIN.agc