Source Code
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These source-code files are part of a reconstructed copy of Luminary 178, the
final release of the Apollo 14 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Zerlina 56, Luminary 210, and
Luminary 131, previously transcribed from digitized copies of those programs.
The code was created by combining the three, using Zerlina 56 as a base, since
it was based off of Luminary 183. The differences between the three were
carefully merged using the Luminary memos as a guide, with all changes made
after Luminary 178 being backed out. The reconstruction was verified by matching
memory-bank checksums to those listed in drawing 2021152N. Note that page numbers
in the reconstructed code match those for the baseline log section mentioned in
each file's changelog; the page numbers for a real Luminary 178 listing would
be different.
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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030057,000002: ## Copyright: Public domain.
030058,000003: ## Filename: R31.agc
030059,000004: ## Purpose: A section of Luminary revision 178.
030060,000005: ## It is part of the reconstructed source code for the final
030061,000006: ## release of the flight software for the Lunar Module's
030062,000007: ## (LM) Apollo Guidance Computer (AGC) for Apollo 14. The
030063,000008: ## code has been recreated from copies of Zerlina 56, Luminary
030064,000009: ## 210, and Luminary 131, as well as many Luminary memos.
030065,000010: ## It has been adapted such that the resulting bugger words
030066,000011: ## exactly match those specified for Luminary 178 in NASA
030067,000012: ## drawing 2021152N, which gives relatively high confidence
030068,000013: ## that the reconstruction is correct.
030069,000014: ## Reference: pp. 698-702
030070,000015: ## Assembler: yaYUL
030071,000016: ## Contact: Ron Burkey <info@sandroid.org>.
030072,000017: ## Website: www.ibiblio.org/apollo/index.html
030073,000018: ## Mod history: 2019-08-14 MAS Created from Zerlina 56.
030074,000019:
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Page 698
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030076,000021: 40,3746 BANK 40
030077,000022: 40,2000 SETLOC R31LOC
030078,000023: 40,2000 BANK
030079,000024:
030080,000025: 40,3746 COUNT* $$/R31
030081,000026:
030082,000027: 40,3746 35015 R31CALL CAF PRIO3
030083,000028: 40,3747 05105 TC FINDVAC
030084,000029: 40,3750 E7,1470 EBANK= SUBEXIT
030085,000030: 40,3750 03113 76067 2CADR V83CALL
030086,000031:
030087,000032: 40,3752 05232 DSPDELAY TC FIXDELAY
030088,000033: 40,3753 00144 DEC 100 B-14
030089,000034: 40,3754 31043 CA EXTVBACT
030090,000035: 40,3755 74740 MASK BIT12
030091,000036: 40,3756 00006 EXTEND
030092,000037: 40,3757 13752 BZF DSPDELAY
030093,000038:
030094,000039: 40,3760 35017 CAF PRIO5
030095,000040: 40,3761 05072 TC NOVAC
030096,000041: 40,3762 E7,1611 EBANK= TSTRT
030097,000042: 40,3762 03766 60107 2CADR DISPN5X
030098,000043:
030099,000044: 40,3764 15272 TCF TASKOVER
030100,000045:
030101,000046: 40,3765 04066 V16N54 VN 1654
030102,000047: 40,3766 33765 DISPN5X CAF V16N54
030103,000048: 40,3767 04616 TC BANKCALL
030104,000049: 40,3770 20334 CADR GOMARKF
030105,000050: 40,3771 05574 TC B5OFF
030106,000051: 40,3772 05574 TC B5OFF
030107,000052: 40,3773 13766 TCF DISPN5X
030108,000053:
030109,000054: 37,3113 BANK 37
030110,000055: 37,2000 SETLOC R31
030111,000056: 37,2000 BANK
030112,000057:
030113,000058: 37,3113 40103 V83CALL CS FLAGWRD7 # TEST AVERAGE G FLAG
030114,000059: 37,3114 74747 MASK AVEGFBIT
030115,000060: 37,3115 00006 EXTEND
030116,000061: 37,3116 13371 BZF MUNG? # ON - TEST MUNFLAG
030117,000062:
030118,000063: 37,3117 40104 CS FLAGWRD8
030119,000064: 37,3120 74744 MASK SURFFBIT
030120,000065: 37,3121 00006 EXTEND
030121,000066: 37,3122 13375 BZF ONEBASE # ON SURFACE - BYPASS LEMPREC
030122,000067:
030123,000068: 37,3123 06042 TC INTPRET # EXTRAPOLATE BOTH STATE VECTORS
030124,000069: 37,3124 77634 RTB
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Page 699
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030126,000071: 37,3125 21574 LOADTIME
030127,000072: 37,3126 34041 STCALL TDEC1
030128,000073: 37,3127 27056 LEMPREC # PRECISION BASE VECTOR FOR LM
030129,000074: 37,3130 77775 VLOAD
030130,000075: 37,3131 00017 RATT1
030131,000076: 37,3132 26170 STOVL BASETHP
030132,000077: 37,3133 00025 VATT1
030133,000078: 37,3134 16105 STODL BASETHV
030134,000079: 37,3135 00015 TAT
030135,000080: 37,3136 02114 DOCMBASE STORE BASETIME # PRECISION BASE VECTOR FOR CM
030136,000081: 37,3137 34041 STCALL TDEC1
030137,000082: 37,3140 27042 CSMPREC
030138,000083: 37,3141 77775 VLOAD
030139,000084: 37,3142 00017 RATT1
030140,000085: 37,3143 26140 STOVL BASEOTP
030141,000086: 37,3144 00025 VATT1
030142,000087: 37,3145 02120 STORE BASEOTV
030143,000088: 37,3146 77776 EXIT
030144,000089:
030145,000090: 37,3147 40103 REV83 CS FLAGWRD7
030146,000091: 37,3150 74747 MASK AVEGFBIT
030147,000092: 37,3151 00006 EXTEND
030148,000093: 37,3152 13320 BZF GETRVN # IF AVEGFLAG SET, USE RN,VN
030149,000094:
030150,000095: 37,3153 40104 CS FLAGWRD8
030151,000096: 37,3154 74744 MASK SURFFBIT
030152,000097: 37,3155 00006 EXTEND
030153,000098: 37,3156 13362 BZF R31SURF # IF ON SURFACE,USE LEMAREC
030154,000099:
030155,000100: 37,3157 06042 TC INTPRET # DO CONIC EXTRAPOLATION FOR BOTH VEHICLES
030156,000101: 37,3160 77634 RTB
030157,000102: 37,3161 21574 LOADTIME
030158,000103: 37,3162 34041 STCALL TDEC1
030159,000104: 37,3163 27410 INTSTALL
030160,000105: 37,3164 43175 VLOAD CLEAR
030161,000106: 37,3165 02170 BASETHP
030162,000107: 37,3166 00263 MOONFLAG
030163,000108: 37,3167 25535 STOVL RCV
030164,000109: 37,3170 02105 BASETHV
030165,000110: 37,3171 15543 STODL VCV
030166,000111: 37,3172 02114 BASETIME
030167,000112: 37,3173 43014 BOF SET # GET APPROPRIATE MOONFLAG SETTING
030168,000113: 37,3174 04344 MOONTHIS
030169,000114: 37,3175 77177 +2
030170,000115: 37,3176 00063 MOONFLAG
030171,000116: 37,3177 77614 SET
030172,000117: 37,3200 01473 INTYPFLG # CONIC EXTRAP.
030173,000118: 37,3201 35517 STCALL TET
030174,000119: 37,3202 27106 INTEGRVS # INTEGRATION --- AT LAST---
030175,000120: 37,3203 77775 OTHCONIC VLOAD
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Page 700
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030177,000122: 37,3204 00001 RATT
030178,000123: 37,3205 26207 STOVL RONE
030179,000124: 37,3206 00007 VATT
030180,000125: 37,3207 36215 STCALL VONE # GET SET FOR CONIC EXTRAP.,OTHER.
030181,000126: 37,3210 27410 INTSTALL
030182,000127: 37,3211 71214 SET DLOAD
030183,000128: 37,3212 01473 INTYPFLG
030184,000129: 37,3213 00015 TAT
030185,000130: 37,3214 00041 OTHINT STORE TDEC1
030186,000131: 37,3215 43175 VLOAD CLEAR
030187,000132: 37,3216 02140 BASEOTP
030188,000133: 37,3217 00263 MOONFLAG
030189,000134: 37,3220 25535 STOVL RCV
030190,000135: 37,3221 02120 BASEOTV
030191,000136: 37,3222 15543 STODL VCV
030192,000137: 37,3223 02114 BASETIME
030193,000138: 37,3224 43014 BOF SET
030194,000139: 37,3225 04344 MOONTHIS
030195,000140: 37,3226 77230 +2
030196,000141: 37,3227 00063 MOONFLAG
030197,000142: 37,3230 35517 STCALL TET
030198,000143: 37,3231 27106 INTEGRVS
030199,000144: 37,3232 52375 COMPDISP VLOAD VSU
030200,000145: 37,3233 00001 RATT
030201,000146: 37,3234 02207 RONE
030202,000147: 37,3235 65234 RTB PDDL
030203,000148: 37,3236 21725 NORMUNX1 # UNIT(RANGE) TO PD 0-5
030204,000149: 37,3237 00045 36D
030205,000150: 37,3240 77657 SL* # RESCALE AFTER NORMUNIT
030206,000151: 37,3241 20201 0,1
030207,000152: 37,3242 26201 STOVL RANGE # SCALED 2(29)M
030208,000153: 37,3243 00007 VATT
030209,000154: 37,3244 50251 VSU DOT # (VCM- VLM).UNIT(LOS), PD=0
030210,000155: 37,3245 02215 VONE
030211,000156: 37,3246 77752 SL1 # SCALED 2(7)M/CS
030212,000157: 37,3247 26203 STOVL RRATE
030213,000158: 37,3250 02207 RONE
030214,000159: 37,3251 63256 UNIT PDVL # UNIT(R) TO PD 0-5
030215,000160: 37,3252 06462 UNITZ
030216,000161: 37,3253 77624 CALL
030217,000162: 37,3254 47636 CDU*NBSM
030218,000163: 37,3255 41505 VXM PUSH # UNIT (Z)/4 TO PD 6-11
030219,000164: 37,3256 01732 REFSMMAT
030220,000165: 37,3257 72431 VPROJ VSL2 # UNIT(P)=UNIT(UZ -(UZ)PROJ(UR))
030221,000166: 37,3260 00001 0D
030222,000167: 37,3261 53445 BVSU UNIT
030223,000168: 37,3262 00007 6D
030224,000169: 37,3263 47315 PDVL VXV # UNIT(P) TO PD 12-17
030225,000170: 37,3264 00001 0D # UNIT(RL)
030226,000171: 37,3265 02215 VONE
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Page 701
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030228,000173: 37,3266 50235 VXV DOT # (UR * VL)*UR . U(P)
030229,000174: 37,3267 00001 0D
030230,000175: 37,3270 00015 12D
030231,000176: 37,3271 77715 PDVL # SIGN TO 12-13 , LOAD U(P)
030232,000177: 37,3272 75241 DOT SIGN
030233,000178: 37,3273 00007 6D
030234,000179: 37,3274 00015 12D
030235,000180: 37,3275 65512 SL2 ACOS # ARCCOS(UP.UZ(SIGN))
030236,000181: 37,3276 26205 STOVL RTHETA
030237,000182: 37,3277 00001 0D
030238,000183: 37,3300 51041 DOT BPL # IF UR.UZ NEG,
030239,000184: 37,3301 00007 6D # RTHETA = 1 - RTHETA
030240,000185: 37,3302 77307 +5
030241,000186: 37,3303 45345 DLOAD DSU
030242,000187: 37,3304 06476 DPPOSMAX
030243,000188: 37,3305 02205 RTHETA
030244,000189: 37,3306 02205 STORE RTHETA
030245,000190: 37,3307 77776 EXIT
030246,000191:
030247,000192: 37,3310 34747 CA BIT5
030248,000193: 37,3311 71043 MASK EXTVBACT
030249,000194: 37,3312 00006 EXTEND # IF ANSWERED,
030250,000195: 37,3313 15503 BZF ENDEXT # TERMINATE
030251,000196:
030252,000197: 37,3314 41043 CS EXTVBACT
030253,000198: 37,3315 74740 MASK BIT12
030254,000199: 37,3316 27043 ADS EXTVBACT # SET BIT 12
030255,000200: 37,3317 13147 TCF REV83 # AND START AGAIN.
030256,000201:
030257,000202: 37,3320 37713 GETRVN CA PRIO22 # INHIBIT SERVICER
030258,000203: 37,3321 05146 TC PRIOCHNG
030259,000204: 37,3322 06042 TC INTPRET
030260,000205: 37,3323 40375 VLOAD SETPD
030261,000206: 37,3324 01220 RN # LM STATE VECTOR IN RN,VN
030262,000207: 37,3325 00001 0
030263,000208: 37,3326 26207 STOVL RONE
030264,000209: 37,3327 01226 VN
030265,000210: 37,3330 26215 STOVL VONE # LOAD R(CSM),V(CSM) IN CASE MUNFLAG SET
030266,000211: 37,3331 01724 V(CSM) # (TO INSURE TIME COMPATABILITY)
030267,000212: 37,3332 65315 PDVL PDDL
030268,000213: 37,3333 01716 R(CSM)
030269,000214: 37,3334 01234 PIPTIME
030270,000215: 37,3335 77776 EXIT
030271,000216: 37,3336 35015 CA PRIO3
030272,000217: 37,3337 05146 TC PRIOCHNG
030273,000218: 37,3340 06042 TC INTPRET
030274,000219: 37,3341 77214 BOFF VLOAD
030275,000220: 37,3342 03347 MUNFLAG
030276,000221: 37,3343 77355 GETRVN2 # IF MUNFLAG RESET, DO CM DELTA PRECISION
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Page 702
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030278,000223: 37,3344 60505 VXM VSR4 # CHANGE TO REFERENCE SYSTEM AND RESCALE
030279,000224: 37,3345 01732 REFSMMAT
030280,000225: 37,3346 77715 PDVL # R TO PD 0-5
030281,000226: 37,3347 76505 VXM VSL1
030282,000227: 37,3350 01732 REFSMMAT
030283,000228: 37,3351 40206 PUSH SETPD # V TO PD 5-11
030284,000229: 37,3352 00001 0
030285,000230: 37,3353 77650 GOTO
030286,000231: 37,3354 77232 COMPDISP
030287,000232:
030288,000233: 37,3355 77624 GETRVN2 CALL
030289,000234: 37,3356 27410 INTSTALL
030290,000235: 37,3357 52014 CLEAR GOTO
030291,000236: 37,3360 01673 INTYPFLG # PREC EXTRAP FOR OTHER
030292,000237: 37,3361 77214 OTHINT
030293,000238: 37,3362 06042 R31SURF TC INTPRET
030294,000239: 37,3363 77634 RTB # LM IS ON SURFACE, SO PRECISION
030295,000240: 37,3364 21574 LOADTIME # INTEGRATION USES PLANETARY INERTIAL
030296,000241: 37,3365 34041 STCALL TDEC1 # ORIENTATION SUBROUTINE
030297,000242: 37,3366 27056 LEMPREC
030298,000243: 37,3367 77650 GOTO # DO CSM CONIC
030299,000244: 37,3370 77203 OTHCONIC
030300,000245: 37,3371 40102 MUNG? CS FLAGWRD6
030301,000246: 37,3372 74744 MASK MUNFLBIT
030302,000247: 37,3373 00006 EXTEND
030303,000248: 37,3374 13320 BZF GETRVN # IF MUNFLAG SET, CSM BASE NOT NEEDED
030304,000249:
030305,000250: 37,3375 06042 ONEBASE TC INTPRET # GET CSM BASE VECTOR
030306,000251: 37,3376 52034 RTB GOTO
030307,000252: 37,3377 21574 LOADTIME
030308,000253: 37,3400 77136 DOCMBASE
End of include-file R31.agc. Parent file is MAIN.agc