Source Code
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These source-code files are part of a reconstructed copy of Luminary 96, the
original release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with reconstructed source code for Luminary 97. Changes
between revisions 96 and 97 were backed out, as described by anomal report LNY-59.
transcribed from a digitized copy of that program. The reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152D.
Note that page numbers in the reconstructed code match those on the Luminary 099
revision 001 printout, although the added code would likely have changed page
numbers for a real Luminary 96 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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033371,000002: ## Copyright: Public domain.
033372,000003: ## Filename: THE_LUNAR_LANDING.agc
033373,000004: ## Purpose: A section of Luminary revision 96.
033374,000005: ## It is part of the reconstructed source code for the
033375,000006: ## original release of the flight software for the Lunar
033376,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
033377,000008: ## The code has been recreated from a previously reconstructed
033378,000009: ## copy of Luminary 97 by undoing changes described in anomaly
033379,000010: ## report LNY-59. The code has been adapted such that the
033380,000011: ## resulting bugger words exactly match those specified for
033381,000012: ## Luminary 96 in NASA drawing 2021152D, which gives relatively
033382,000013: ## high confidence that the reconstruction is correct.
033383,000014: ## Reference: pp. 785-792
033384,000015: ## Assembler: yaYUL
033385,000016: ## Contact: Ron Burkey <info@sandroid.org>.
033386,000017: ## Website: www.ibiblio.org/apollo/index.html
033387,000018: ## Mod history: 2019-08-04 MAS Created from Luminary 97.
033388,000019:
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Page 785
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033390,000021: 32,2776 BANK 32
033391,000022: 32,2000 SETLOC F2DPS*32
033392,000023: 32,2000 BANK
033393,000024:
033394,000025: 32,2776 E7,1621 EBANK= E2DPS
033395,000026:
033396,000027: # ****************************************
033397,000028: # P63: THE LUNAR LANDING, BRAKING PHASE
033398,000029: # ****************************************
033399,000030:
033400,000031: 32,2776 COUNT* $$/P63
033401,000032:
033402,000033: 32,2776 05353 P63LM TC PHASCHNG
033403,000034: 32,2777 04024 OCT 04024
033404,000035:
033405,000036: 32,3000 04616 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
033406,000037: 32,3001 11254 CADR R02BOTH
033407,000038:
033408,000039: 32,3002 33253 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
033409,000040: 32,3003 55455 TS WHICH
033410,000041:
033411,000042: 32,3004 32000 CAF DPSTHRSH # INITIALIZE DVMON
033412,000043: 32,3005 55251 TS DVTHRUSH
033413,000044: 32,3006 34751 CAF FOUR
033414,000045: 32,3007 55515 TS DVCNTR
033415,000046:
033416,000047: 32,3010 44753 CS ONE # INITIALIZE WCHPHASE AND FLPASSO
033417,000048: 32,3011 55351 TS WCHPHASE
033418,000049:
033419,000050: 32,3012 34755 CA ZERO
033420,000051: 32,3013 55623 TS FLPASS0
033421,000052:
033422,000053: 32,3014 44736 CS BIT14
033423,000054: 32,3015 00006 EXTEND
033424,000055: 32,3016 03012 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
033425,000056:
033426,000057: 32,3017 06037 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
033427,000058: 32,3020 43014 CLEAR CLEAR
033428,000059: 32,3021 02663 NOTHROTL
033429,000060: 32,3022 03271 REDFLAG
033430,000061: 32,3023 43014 CLEAR SET
033431,000062: 32,3024 05660 LRBYPASS
033432,000063: 32,3025 03067 MUNFLAG
033433,000064: 32,3026 43014 CLEAR CLEAR
033434,000065: 32,3027 00266 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
033435,000066: 32,3030 00270 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
033436,000067:
033437,000068: # ****************************************
033438,000069:
033439,000070: 32,3031 77201 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
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Page 786
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033441,000072: 32,3032 00001 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
033442,000073: 32,3033 02023 RLS # AT 6D ESTIMATED TIME OF LANDING
033443,000074: 32,3034 41525 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
033444,000075: 32,3035 02401 TLAND
033445,000076: 32,3036 37625 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
033446,000077: 32,3037 55716 RP-TO-R
033447,000078: 32,3040 64312 VSL4 MXV
033448,000079: 32,3041 01734 REFSMMAT
033449,000080: 32,3042 37635 STCALL LAND
033450,000081: 32,3043 46432 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
033451,000082: 32,3044 45345 DLOAD DSU
033452,000083: 32,3045 02401 TLAND
033453,000084: 32,3046 25260 GUIDDURN
033454,000085: 32,3047 34041 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
033455,000086: 32,3050 27057 LEMPREC
033456,000087: 32,3051 77331 SSP VLOAD
033457,000088: 32,3052 03647 NIGNLOOP
033458,000089: 32,3053 00050 40D
033459,000090: 32,3054 06520 UNITX
033460,000091: 32,3055 26603 STOVL CG
033461,000092: 32,3056 06516 UNITY
033462,000093: 32,3057 26611 STOVL CG +6
033463,000094: 32,3060 06514 UNITZ
033464,000095: 32,3061 16617 STODL CG +14
033465,000096: 32,3062 25256 99999CON
033466,000097: 32,3063 27665 STOVL DELTAH # INITIALIZE DELTAH FOR V16N68 DISPLAY
033467,000098: 32,3064 06522 ZEROVECS
033468,000099: 32,3065 17254 STODL UNFC/2 # INITIALIZE TRIM VELOCITY CORRECTION TERM
033469,000100: 32,3066 06522 HI6ZEROS
033470,000101: 32,3067 03643 STORE TTF/8
033471,000102:
033472,000103: 32,3070 77745 IGNALOOP DLOAD
033473,000104: 32,3071 00015 TAT
033474,000105: 32,3072 27561 STOVL PIPTIME1
033475,000106: 32,3073 00017 RATT1
033476,000107: 32,3074 64312 VSL4 MXV
033477,000108: 32,3075 01734 REFSMMAT
033478,000109: 32,3076 37521 STCALL R
033479,000110: 32,3077 67130 MUNGRAV
033480,000111: 32,3100 35237 STCALL GDT/2
033481,000112: 32,3101 62454 ?GUIDSUB # WHICH DELIVERS N PASSES OF GUIDANCE
033482,000113:
033483,000114: # DDUMCALC IS PROGRAMMED AS FOLLOWS:-
033484,000115: # 2 -
033485,000116: # (RIGNZ - RGU )/16 + 16(RGU )KIGNY/B8 + (RGU - RIGNX)KIGNX/B4 + (ABVAL(VGU) - VIGN)KIGNV/B4
033486,000117: # 2 1 0
033487,000118: # DDUM = -------------------------------------------------------------------------------------------
033488,000119: # 10
033489,000120: # 2 (VGU - 16 VGU KIGNX/B4)
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Page 787
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033491,000122: # 2 0
033492,000123: # THE NUMERATOR IS SCALED IN METERS AT 2(28). THE DENOMINATOR IS A VELOCITY IN UNITS OF 2(10) M/CS.
033493,000124: # THE QUOTIENT IS THUS A TIME IN UNITS OF 2(18) CENTISECONDS. THE FINAL SHIFT RESCALES TO UNITS OF 2(28) CS.
033494,000125: # THERE IS NO DAMPING FACTOR. THE CONSTANTS KIGNX/B4, KIGNY/B8 AND KIGNV/B4 ARE ALL NEGATIVE IN SIGN.
033495,000126:
033496,000127: 32,3102 55646 DDUMCALC TS NIGNLOOP
033497,000128: 32,3103 06037 TC INTPRET
033498,000129: 32,3104 57345 DLOAD DMPR # FORM DENOMINATOR FIRST
033499,000130: 32,3105 03627 VGU
033500,000131: 32,3106 02501 KIGNX/B4
033501,000132: 32,3107 44232 SL4R BDSU
033502,000133: 32,3110 03633 VGU +4
033503,000134: 32,3111 45325 PDDL DSU
033504,000135: 32,3112 02477 RIGNZ
033505,000136: 32,3113 02643 RGU +4
033506,000137: 32,3114 65222 SR4R PDDL
033507,000138: 32,3115 02641 RGU +2
033508,000139: 32,3116 57316 DSQ DMPR
033509,000140: 32,3117 02503 KIGNY/B8
033510,000141: 32,3120 65232 SL4R PDDL
033511,000142: 32,3121 02637 RGU
033512,000143: 32,3122 57225 DSU DMPR
033513,000144: 32,3123 02475 RIGNX
033514,000145: 32,3124 02501 KIGNX/B4
033515,000146: 32,3125 51515 PDVL ABVAL
033516,000147: 32,3126 03627 VGU
033517,000148: 32,3127 57225 DSU DMPR
033518,000149: 32,3130 02473 VIGN
033519,000150: 32,3131 02505 KIGNV/B4
033520,000151: 32,3132 43215 DAD DAD
033521,000152: 32,3133 56215 DAD DDV
033522,000153: 32,3134 77661 SRR
033523,000154: 32,3135 21613 10D
033524,000155:
033525,000156: 32,3136 43206 PUSH DAD
033526,000157: 32,3137 03561 PIPTIME1
033527,000158: 32,3140 14041 STODL TDEC1 # STORE NEW GUESS FOR NEXT INTEGRATION
033528,000159: 32,3141 45246 ABS DSU
033529,000160: 32,3142 25262 DDUMCRIT
033530,000161: 32,3143 45040 BMN CALL
033531,000162: 32,3144 65163 DDUMGOOD
033532,000163: 32,3145 27414 INTSTALL
033533,000164: 32,3146 43014 SET SET
033534,000165: 32,3147 01473 INTYPFLG
033535,000166: 32,3150 00063 MOONFLAG
033536,000167: 32,3151 77745 DLOAD
033537,000168: 32,3152 03561 PIPTIME1
033538,000169: 32,3153 25517 STOVL TET # HOPEFULLY ?GUIDSUB DID NOT
033539,000170: 32,3154 00017 RATT1 # CLOBBER RATT1 AND VATT1
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Page 788
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033541,000172: 32,3155 25535 STOVL RCV
033542,000173: 32,3156 00025 VATT1
033543,000174: 32,3157 35543 STCALL VCV
033544,000175: 32,3160 27107 INTEGRVS
033545,000176: 32,3161 77650 GOTO
033546,000177: 32,3162 65070 IGNALOOP
033547,000178:
033548,000179: 32,3163 54335 DDUMGOOD SLOAD SR
033549,000180: 32,3164 03423 ZOOMTIME
033550,000181: 32,3165 20617 14D
033551,000182: 32,3166 77621 BDSU
033552,000183: 32,3167 00041 TDEC1
033553,000184: 32,3170 27442 STOVL TIG # COMPUTE DISTANCE LANDING SITE WILL BE
033554,000185: 32,3171 03527 V # OUT OF LM'S ORBITAL PLANE AT IGNITION:
033555,000186: 32,3172 53435 VXV UNIT # SIGN IS + IF LANDING SITE IS TO THE
033556,000187: 32,3173 03521 R # RIGHT, NORTH; - IF TO THE LEFT, SOUTH.
033557,000188: 32,3174 72441 DOT SL1
033558,000189: 32,3175 03635 LAND
033559,000190: 32,3176 26627 R60INIT STOVL OUTOFPLN # INITIALIZATION FOR CALCMANU
033560,000191: 32,3177 03254 UNFC/2
033561,000192: 32,3200 02631 STORE R60VSAVE # STORE UNFC/2 TEMPORARILY IN R60SAVE
033562,000193: 32,3201 77776 EXIT
033563,000194: # ****************************************
033564,000195:
033565,000196: 32,3202 05353 IGNALGRT TC PHASCHNG # PREVENT REPEATING IGNALG
033566,000197: 32,3203 04024 OCT 04024
033567,000198:
033568,000199: 32,3204 44362 ASTNCLOK CS ASTNDEX
033569,000200: 32,3205 04616 TC BANKCALL
033570,000201: 32,3206 74664 CADR STCLOK2
033571,000202: 32,3207 15155 TCF ENDOFJOB # RETURN IN NEW JOB AND IN EBANK FIVE
033572,000203:
033573,000204: 32,3210 06037 ASTNRET TC INTPRET
033574,000205: 32,3211 47131 SSP RTB # GO PICK UP DISPLAY AT END OF R51:
033575,000206: 32,3212 02747 QMAJ # "PROCEED" WILL DO A FINE ALIGNMENT
033576,000207: 32,3213 65215 FCADR P63SPOT2 # "ENTER" WILL RETURN TO P63SPOT2
033577,000208: 32,3214 31135 R51P63
033578,000209: 32,3215 53575 P63SPOT2 VLOAD UNIT # INITIALIZE KALCMANU FOR BURN ATTITUDE
033579,000210: 32,3216 02631 R60VSAVE
033580,000211: 32,3217 27773 STOVL POINTVSM
033581,000212: 32,3220 06520 UNITX
033582,000213: 32,3221 03765 STORE SCAXIS
033583,000214: 32,3222 77776 EXIT
033584,000215:
033585,000216: 32,3223 35016 CAF EBANK7
033586,000217: 32,3224 54003 TS EBANK
033587,000218:
033588,000219: 32,3225 00004 INHINT
033589,000220: 32,3226 04674 TC IBNKCALL
033590,000221: 32,3227 40142 CADR PFLITEDB
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Page 789
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033592,000223: 32,3230 00003 RELINT
033593,000224:
033594,000225: 32,3231 04616 TC BANKCALL
033595,000226: 32,3232 54123 CADR R60LEM
033596,000227:
033597,000228: 32,3233 05353 TC PHASCHNG # PREVENT RECALLING R60
033598,000229: 32,3234 04024 OCT 04024
033599,000230:
033600,000231: 32,3235 34746 P63SPOT3 CA BIT6 # IS THE LR ANTENNA IN POSITION 1 YET
033601,000232: 32,3236 00006 EXTEND
033602,000233: 32,3237 02033 RAND CHAN33
033603,000234: 32,3240 00006 EXTEND
033604,000235: 32,3241 13247 BZF P63SPOT4 # BRANCH IF ANTENNA ALREADY IN POSITION 1
033605,000236:
033606,000237: 32,3242 33254 CAF CODE500 # ASTRONAUT: PLEASE CRANK THE
033607,000238: 32,3243 04616 TC BANKCALL # SILLY THING AROUND
033608,000239: 32,3244 20623 CADR GOPERF1
033609,000240: 32,3245 16001 TCF GOTOPOOH # TERMINATE
033610,000241: 32,3246 13235 TCF P63SPOT3 # PROCEED SEE IF HE'S LYING
033611,000242:
033612,000243: 32,3247 04616 P63SPOT4 TC BANKCALL # ENTER INITIALIZE LANDING RADAR
033613,000244: 32,3250 67701 CADR SETPOS1
033614,000245:
033615,000246: 32,3251 04635 TC POSTJUMP # OFF TO SEE THE WIZARD ...
033616,000247: 32,3252 74126 CADR BURNBABY
033617,000248:
033618,000249: # ----------------------------------------
033619,000250:
033620,000251: # CONSTANTS FOR P63LM AND IGNALG
033621,000252:
033622,000253: 32,3253 02076 P63ADRES GENADR P63TABLE
033623,000254:
033624,000255: 32,3254 4362 ASTNDEX = MD1 # OCT 25; INDEX FOR CLOKTASK
033625,000256:
033626,000257: 32,3254 00500 CODE500 OCT 00500
033627,000258:
033628,000259: 32,3255 00035 30373 99999CON 2DEC 30479.7 B-24
033629,000260:
033630,000261: 32,3257 00004 01610 GUIDDURN 2DEC +66440 B-28 # GUIDDURN +6.64400314 E+2
033631,000262: 32,3261 00000 00010 DDUMCRIT 2DEC +8 B-28 # CRITERION FOR IGNALG CONVERGENCE
033632,000263:
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Page 790
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033634,000265: # ----------------------------------------
033635,000266:
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Page 791
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033637,000268: # ****************************************
033638,000269: # P68: LANDING CONFIRMATION
033639,000270: # ****************************************
033640,000271:
033641,000272: 31,2144 BANK 31
033642,000273: 31,2000 SETLOC F2DPS*31
033643,000274: 31,2000 BANK
033644,000275:
033645,000276: 31,2144 COUNT* $$/P6567
033646,000277:
033647,000278: 31,2144 05353 LANDJUNK TC PHASCHNG
033648,000279: 31,2145 04024 OCT 04024
033649,000280:
033650,000281: 31,2146 00004 INHINT
033651,000282: 31,2147 04616 TC BANKCALL # ZERO ATTITUDE ERROR
033652,000283: 31,2150 40153 CADR ZATTEROR
033653,000284:
033654,000285: 31,2151 04616 TC BANKCALL # SET 5 DEGREE DEADBAND
033655,000286: 31,2152 40127 CADR SETMAXDB
033656,000287:
033657,000288: 31,2153 06037 TC INTPRET # TO INTERPRETIVE AS TIME IS NOT CRITICAL
033658,000289: 31,2154 43014 SET CLEAR
033659,000290: 31,2155 04067 SURFFLAG
033660,000291: 31,2156 04666 LETABORT
033661,000292: 31,2157 77214 SET VLOAD
033662,000293: 31,2160 05062 APSFLAG
033663,000294: 31,2161 01221 RN
033664,000295: 31,2162 16032 STODL ALPHAV
033665,000296: 31,2163 01235 PIPTIME
033666,000297: 31,2164 45014 SET CALL
033667,000298: 31,2165 01463 LUNAFLAG
033668,000299: 31,2166 26351 LAT-LONG
033669,000300: 31,2167 77201 SETPD VLOAD # COMPUTE RLS AND STORE IT AWAY
033670,000301: 31,2170 00001 0
033671,000302: 31,2171 01221 RN
033672,000303: 31,2172 65352 VSL2 PDDL
033673,000304: 31,2173 01235 PIPTIME
033674,000305: 31,2174 45006 PUSH CALL
033675,000306: 31,2175 51670 R-TO-RP
033676,000307: 31,2176 02023 STORE RLS
033677,000308: 31,2177 77776 EXIT
033678,000309: 31,2200 32215 CAF V06N43* # ASTRONAUT: NOW LOOK WHERE YOU ENDED UP
033679,000310: 31,2201 04616 TC BANKCALL
033680,000311: 31,2202 20476 CADR GOFLASH
033681,000312: 31,2203 16001 TCF GOTOPOOH # TERMINATE
033682,000313: 31,2204 12206 TCF +2 # PROCEED
033683,000314: 31,2205 12200 TCF -5 # RECYCLE
033684,000315:
033685,000316: 31,2206 06037 TC INTPRET
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Page 792
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033687,000318: 31,2207 77775 VLOAD # INITIALIZE GSAV AND (USING REFMF)
033688,000319: 31,2210 06520 UNITX # YNBSAV, ZNBSAV AND ATTFLAG FOR P57
033689,000320: 31,2211 36231 STCALL GSAV
033690,000321: 31,2212 33506 REFMF
033691,000322: 31,2213 77776 EXIT
033692,000323:
033693,000324: 31,2214 16001 TCF GOTOPOOH # ASTRONAUT: PLEASE SELECT P57
033694,000325:
033695,000326: 31,2215 01453 V06N43* VN 0643
033696,000327:
End of include-file THE_LUNAR_LANDING.agc. Parent file is MAIN.agc