Source Code
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These source-code files are part of a reconstructed copy of Luminary 163, the
first (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with reconstructed source code for Luminary 173. Changes
between revision 163 and 173 were backed out, as described by Luminary memos 157
and 158. 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 163 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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029986,000002: ## Copyright: Public domain.
029987,000003: ## Filename: R31.agc
029988,000004: ## Purpose: A section of Luminary revision 163.
029989,000005: ## It is part of the reconstructed source code for the first
029990,000006: ## (unflown) release of the flight software for the Lunar
029991,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
029992,000008: ## The code has been recreated from a reconstructed copy of
029993,000009: ## Luminary 173, as well as Luminary memos 157 amd 158.
029994,000010: ## It has been adapted such that the resulting bugger words
029995,000011: ## exactly match those specified for Luminary 163 in NASA
029996,000012: ## drawing 2021152N, which gives relatively high confidence
029997,000013: ## that the reconstruction is correct.
029998,000014: ## Reference: pp. 698-702
029999,000015: ## Assembler: yaYUL
030000,000016: ## Contact: Ron Burkey <info@sandroid.org>.
030001,000017: ## Website: www.ibiblio.org/apollo/index.html
030002,000018: ## Mod history: 2019-08-21 MAS Created from Luminary 173.
030003,000019:
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Page 698
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030005,000021: 40,3746 BANK 40
030006,000022: 40,2000 SETLOC R31LOC
030007,000023: 40,2000 BANK
030008,000024:
030009,000025: 40,3746 COUNT* $$/R31
030010,000026:
030011,000027: 40,3746 35015 R31CALL CAF PRIO3
030012,000028: 40,3747 05105 TC FINDVAC
030013,000029: 40,3750 E7,1470 EBANK= SUBEXIT
030014,000030: 40,3750 03113 76067 2CADR V83CALL
030015,000031:
030016,000032: 40,3752 05232 DSPDELAY TC FIXDELAY
030017,000033: 40,3753 00144 DEC 100 B-14
030018,000034: 40,3754 31043 CA EXTVBACT
030019,000035: 40,3755 74740 MASK BIT12
030020,000036: 40,3756 00006 EXTEND
030021,000037: 40,3757 13752 BZF DSPDELAY
030022,000038:
030023,000039: 40,3760 35017 CAF PRIO5
030024,000040: 40,3761 05072 TC NOVAC
030025,000041: 40,3762 E7,1611 EBANK= TSTRT
030026,000042: 40,3762 03766 60107 2CADR DISPN5X
030027,000043:
030028,000044: 40,3764 15272 TCF TASKOVER
030029,000045:
030030,000046: 40,3765 04066 V16N54 VN 1654
030031,000047: 40,3766 33765 DISPN5X CAF V16N54
030032,000048: 40,3767 04616 TC BANKCALL
030033,000049: 40,3770 20334 CADR GOMARKF
030034,000050: 40,3771 05574 TC B5OFF
030035,000051: 40,3772 05574 TC B5OFF
030036,000052: 40,3773 13766 TCF DISPN5X
030037,000053:
030038,000054: 37,3113 BANK 37
030039,000055: 37,2000 SETLOC R31
030040,000056: 37,2000 BANK
030041,000057:
030042,000058: 37,3113 40103 V83CALL CS FLAGWRD7 # TEST AVERAGE G FLAG
030043,000059: 37,3114 74747 MASK AVEGFBIT
030044,000060: 37,3115 00006 EXTEND
030045,000061: 37,3116 13371 BZF MUNG? # ON - TEST MUNFLAG
030046,000062:
030047,000063: 37,3117 40104 CS FLAGWRD8
030048,000064: 37,3120 74744 MASK SURFFBIT
030049,000065: 37,3121 00006 EXTEND
030050,000066: 37,3122 13375 BZF ONEBASE # ON SURFACE - BYPASS LEMPREC
030051,000067:
030052,000068: 37,3123 06042 TC INTPRET # EXTRAPOLATE BOTH STATE VECTORS
030053,000069: 37,3124 77634 RTB
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Page 699
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030055,000071: 37,3125 21574 LOADTIME
030056,000072: 37,3126 34041 STCALL TDEC1
030057,000073: 37,3127 27056 LEMPREC # PRECISION BASE VECTOR FOR LM
030058,000074: 37,3130 77775 VLOAD
030059,000075: 37,3131 00017 RATT1
030060,000076: 37,3132 26170 STOVL BASETHP
030061,000077: 37,3133 00025 VATT1
030062,000078: 37,3134 16105 STODL BASETHV
030063,000079: 37,3135 00015 TAT
030064,000080: 37,3136 02114 DOCMBASE STORE BASETIME # PRECISION BASE VECTOR FOR CM
030065,000081: 37,3137 34041 STCALL TDEC1
030066,000082: 37,3140 27042 CSMPREC
030067,000083: 37,3141 77775 VLOAD
030068,000084: 37,3142 00017 RATT1
030069,000085: 37,3143 26140 STOVL BASEOTP
030070,000086: 37,3144 00025 VATT1
030071,000087: 37,3145 02120 STORE BASEOTV
030072,000088: 37,3146 77776 EXIT
030073,000089:
030074,000090: 37,3147 40103 REV83 CS FLAGWRD7
030075,000091: 37,3150 74747 MASK AVEGFBIT
030076,000092: 37,3151 00006 EXTEND
030077,000093: 37,3152 13320 BZF GETRVN # IF AVEGFLAG SET, USE RN,VN
030078,000094:
030079,000095: 37,3153 40104 CS FLAGWRD8
030080,000096: 37,3154 74744 MASK SURFFBIT
030081,000097: 37,3155 00006 EXTEND
030082,000098: 37,3156 13362 BZF R31SURF # IF ON SURFACE,USE LEMAREC
030083,000099:
030084,000100: 37,3157 06042 TC INTPRET # DO CONIC EXTRAPOLATION FOR BOTH VEHICLES
030085,000101: 37,3160 77634 RTB
030086,000102: 37,3161 21574 LOADTIME
030087,000103: 37,3162 34041 STCALL TDEC1
030088,000104: 37,3163 27410 INTSTALL
030089,000105: 37,3164 43175 VLOAD CLEAR
030090,000106: 37,3165 02170 BASETHP
030091,000107: 37,3166 00263 MOONFLAG
030092,000108: 37,3167 25535 STOVL RCV
030093,000109: 37,3170 02105 BASETHV
030094,000110: 37,3171 15543 STODL VCV
030095,000111: 37,3172 02114 BASETIME
030096,000112: 37,3173 43014 BOF SET # GET APPROPRIATE MOONFLAG SETTING
030097,000113: 37,3174 04344 MOONTHIS
030098,000114: 37,3175 77177 +2
030099,000115: 37,3176 00063 MOONFLAG
030100,000116: 37,3177 77614 SET
030101,000117: 37,3200 01473 INTYPFLG # CONIC EXTRAP.
030102,000118: 37,3201 35517 STCALL TET
030103,000119: 37,3202 27106 INTEGRVS # INTEGRATION --- AT LAST---
030104,000120: 37,3203 77775 OTHCONIC VLOAD
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Page 700
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030106,000122: 37,3204 00001 RATT
030107,000123: 37,3205 26207 STOVL RONE
030108,000124: 37,3206 00007 VATT
030109,000125: 37,3207 36215 STCALL VONE # GET SET FOR CONIC EXTRAP.,OTHER.
030110,000126: 37,3210 27410 INTSTALL
030111,000127: 37,3211 71214 SET DLOAD
030112,000128: 37,3212 01473 INTYPFLG
030113,000129: 37,3213 00015 TAT
030114,000130: 37,3214 00041 OTHINT STORE TDEC1
030115,000131: 37,3215 43175 VLOAD CLEAR
030116,000132: 37,3216 02140 BASEOTP
030117,000133: 37,3217 00263 MOONFLAG
030118,000134: 37,3220 25535 STOVL RCV
030119,000135: 37,3221 02120 BASEOTV
030120,000136: 37,3222 15543 STODL VCV
030121,000137: 37,3223 02114 BASETIME
030122,000138: 37,3224 43014 BOF SET
030123,000139: 37,3225 04344 MOONTHIS
030124,000140: 37,3226 77230 +2
030125,000141: 37,3227 00063 MOONFLAG
030126,000142: 37,3230 35517 STCALL TET
030127,000143: 37,3231 27106 INTEGRVS
030128,000144: 37,3232 52375 COMPDISP VLOAD VSU
030129,000145: 37,3233 00001 RATT
030130,000146: 37,3234 02207 RONE
030131,000147: 37,3235 65234 RTB PDDL
030132,000148: 37,3236 21725 NORMUNX1 # UNIT(RANGE) TO PD 0-5
030133,000149: 37,3237 00045 36D
030134,000150: 37,3240 77657 SL* # RESCALE AFTER NORMUNIT
030135,000151: 37,3241 20201 0,1
030136,000152: 37,3242 26201 STOVL RANGE # SCALED 2(29)M
030137,000153: 37,3243 00007 VATT
030138,000154: 37,3244 50251 VSU DOT # (VCM- VLM).UNIT(LOS), PD=0
030139,000155: 37,3245 02215 VONE
030140,000156: 37,3246 77752 SL1 # SCALED 2(7)M/CS
030141,000157: 37,3247 26203 STOVL RRATE
030142,000158: 37,3250 02207 RONE
030143,000159: 37,3251 63256 UNIT PDVL # UNIT(R) TO PD 0-5
030144,000160: 37,3252 06512 UNITZ
030145,000161: 37,3253 77624 CALL
030146,000162: 37,3254 47666 CDU*NBSM
030147,000163: 37,3255 41505 VXM PUSH # UNIT (Z)/4 TO PD 6-11
030148,000164: 37,3256 01732 REFSMMAT
030149,000165: 37,3257 72431 VPROJ VSL2 # UNIT(P)=UNIT(UZ -(UZ)PROJ(UR))
030150,000166: 37,3260 00001 0D
030151,000167: 37,3261 53445 BVSU UNIT
030152,000168: 37,3262 00007 6D
030153,000169: 37,3263 47315 PDVL VXV # UNIT(P) TO PD 12-17
030154,000170: 37,3264 00001 0D # UNIT(RL)
030155,000171: 37,3265 02215 VONE
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Page 701
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030157,000173: 37,3266 50235 VXV DOT # (UR * VL)*UR . U(P)
030158,000174: 37,3267 00001 0D
030159,000175: 37,3270 00015 12D
030160,000176: 37,3271 77715 PDVL # SIGN TO 12-13 , LOAD U(P)
030161,000177: 37,3272 75241 DOT SIGN
030162,000178: 37,3273 00007 6D
030163,000179: 37,3274 00015 12D
030164,000180: 37,3275 65512 SL2 ACOS # ARCCOS(UP.UZ(SIGN))
030165,000181: 37,3276 26205 STOVL RTHETA
030166,000182: 37,3277 00001 0D
030167,000183: 37,3300 51041 DOT BPL # IF UR.UZ NEG,
030168,000184: 37,3301 00007 6D # RTHETA = 1 - RTHETA
030169,000185: 37,3302 77307 +5
030170,000186: 37,3303 45345 DLOAD DSU
030171,000187: 37,3304 06526 DPPOSMAX
030172,000188: 37,3305 02205 RTHETA
030173,000189: 37,3306 02205 STORE RTHETA
030174,000190: 37,3307 77776 EXIT
030175,000191:
030176,000192: 37,3310 34747 CA BIT5
030177,000193: 37,3311 71043 MASK EXTVBACT
030178,000194: 37,3312 00006 EXTEND # IF ANSWERED,
030179,000195: 37,3313 15503 BZF ENDEXT # TERMINATE
030180,000196:
030181,000197: 37,3314 41043 CS EXTVBACT
030182,000198: 37,3315 74740 MASK BIT12
030183,000199: 37,3316 27043 ADS EXTVBACT # SET BIT 12
030184,000200: 37,3317 13147 TCF REV83 # AND START AGAIN.
030185,000201:
030186,000202: 37,3320 37713 GETRVN CA PRIO22 # INHIBIT SERVICER
030187,000203: 37,3321 05146 TC PRIOCHNG
030188,000204: 37,3322 06042 TC INTPRET
030189,000205: 37,3323 40375 VLOAD SETPD
030190,000206: 37,3324 01220 RN # LM STATE VECTOR IN RN,VN
030191,000207: 37,3325 00001 0
030192,000208: 37,3326 26207 STOVL RONE
030193,000209: 37,3327 01226 VN
030194,000210: 37,3330 26215 STOVL VONE # LOAD R(CSM),V(CSM) IN CASE MUNFLAG SET
030195,000211: 37,3331 01724 V(CSM) # (TO INSURE TIME COMPATABILITY)
030196,000212: 37,3332 65315 PDVL PDDL
030197,000213: 37,3333 01716 R(CSM)
030198,000214: 37,3334 01234 PIPTIME
030199,000215: 37,3335 77776 EXIT
030200,000216: 37,3336 35015 CA PRIO3
030201,000217: 37,3337 05146 TC PRIOCHNG
030202,000218: 37,3340 06042 TC INTPRET
030203,000219: 37,3341 77214 BOFF VLOAD
030204,000220: 37,3342 03347 MUNFLAG
030205,000221: 37,3343 77355 GETRVN2 # IF MUNFLAG RESET, DO CM DELTA PRECISION
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Page 702
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030207,000223: 37,3344 60505 VXM VSR4 # CHANGE TO REFERENCE SYSTEM AND RESCALE
030208,000224: 37,3345 01732 REFSMMAT
030209,000225: 37,3346 77715 PDVL # R TO PD 0-5
030210,000226: 37,3347 76505 VXM VSL1
030211,000227: 37,3350 01732 REFSMMAT
030212,000228: 37,3351 40206 PUSH SETPD # V TO PD 5-11
030213,000229: 37,3352 00001 0
030214,000230: 37,3353 77650 GOTO
030215,000231: 37,3354 77232 COMPDISP
030216,000232:
030217,000233: 37,3355 77624 GETRVN2 CALL
030218,000234: 37,3356 27410 INTSTALL
030219,000235: 37,3357 52014 CLEAR GOTO
030220,000236: 37,3360 01673 INTYPFLG # PREC EXTRAP FOR OTHER
030221,000237: 37,3361 77214 OTHINT
030222,000238: 37,3362 06042 R31SURF TC INTPRET
030223,000239: 37,3363 77634 RTB # LM IS ON SURFACE, SO PRECISION
030224,000240: 37,3364 21574 LOADTIME # INTEGRATION USES PLANETARY INERTIAL
030225,000241: 37,3365 34041 STCALL TDEC1 # ORIENTATION SUBROUTINE
030226,000242: 37,3366 27056 LEMPREC
030227,000243: 37,3367 77650 GOTO # DO CSM CONIC
030228,000244: 37,3370 77203 OTHCONIC
030229,000245: 37,3371 40102 MUNG? CS FLAGWRD6
030230,000246: 37,3372 74744 MASK MUNFLBIT
030231,000247: 37,3373 00006 EXTEND
030232,000248: 37,3374 13320 BZF GETRVN # IF MUNFLAG SET, CSM BASE NOT NEEDED
030233,000249:
030234,000250: 37,3375 06042 ONEBASE TC INTPRET # GET CSM BASE VECTOR
030235,000251: 37,3376 52034 RTB GOTO
030236,000252: 37,3377 21574 LOADTIME
030237,000253: 37,3400 77136 DOCMBASE
End of include-file R31.agc. Parent file is MAIN.agc