Source Code
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These source-code files are part of a reconstructed copy of Luminary 97, the
original release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Luminary 99 revision 1 previously
transcribed from a digitized copy of that program. The code was then updated
by undoing changes described in original Luminary memos 83 and 85, using asterisks
indicating changed lines in the listing as a guide. 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 97 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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033444,000002: ## Copyright: Public domain.
033445,000003: ## Filename: THE_LUNAR_LANDING.agc
033446,000004: ## Purpose: A section of Luminary revision 97.
033447,000005: ## It is part of the reconstructed source code for the
033448,000006: ## original release of the flight software for the Lunar
033449,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
033450,000008: ## The code has been recreated from a copy of Luminary 99
033451,000009: ## revision 001, using asterisks indicating changed lines in
033452,000010: ## the listing and Luminary Memos #83 and #85, which list
033453,000011: ## changes between Luminary 97 and 98, and 98 and 99. The
033454,000012: ## code has been adapted such that the resulting bugger words
033455,000013: ## exactly match those specified for Luminary 97 in NASA drawing
033456,000014: ## 2021152D, which gives relatively high confidence that the
033457,000015: ## reconstruction is correct.
033458,000016: ## Reference: pp. 785-792
033459,000017: ## Assembler: yaYUL
033460,000018: ## Contact: Ron Burkey <info@sandroid.org>.
033461,000019: ## Website: www.ibiblio.org/apollo/index.html
033462,000020: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
033463,000021:
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Page 785
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033465,000023: 32,2776 BANK 32
033466,000024: 32,2000 SETLOC F2DPS*32
033467,000025: 32,2000 BANK
033468,000026:
033469,000027: 32,2776 E7,1621 EBANK= E2DPS
033470,000028:
033471,000029: # ****************************************
033472,000030: # P63: THE LUNAR LANDING, BRAKING PHASE
033473,000031: # ****************************************
033474,000032:
033475,000033: 32,2776 COUNT* $$/P63
033476,000034:
033477,000035: 32,2776 05353 P63LM TC PHASCHNG
033478,000036: 32,2777 04024 OCT 04024
033479,000037:
033480,000038: 32,3000 04616 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
033481,000039: 32,3001 11254 CADR R02BOTH
033482,000040:
033483,000041: 32,3002 33253 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
033484,000042: 32,3003 55455 TS WHICH
033485,000043:
033486,000044: 32,3004 32000 CAF DPSTHRSH # INITIALIZE DVMON
033487,000045: 32,3005 55251 TS DVTHRUSH
033488,000046: 32,3006 34751 CAF FOUR
033489,000047: 32,3007 55515 TS DVCNTR
033490,000048:
033491,000049: 32,3010 44753 CS ONE # INITIALIZE WCHPHASE AND FLPASSO
033492,000050: 32,3011 55351 TS WCHPHASE
033493,000051:
033494,000052: 32,3012 34755 CA ZERO
033495,000053: 32,3013 55623 TS FLPASS0
033496,000054:
033497,000055: 32,3014 44736 CS BIT14
033498,000056: 32,3015 00006 EXTEND
033499,000057: 32,3016 03012 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
033500,000058:
033501,000059: 32,3017 06037 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
033502,000060: 32,3020 43014 CLEAR CLEAR
033503,000061: 32,3021 02663 NOTHROTL
033504,000062: 32,3022 03271 REDFLAG
033505,000063: 32,3023 43014 CLEAR SET
033506,000064: 32,3024 05660 LRBYPASS
033507,000065: 32,3025 03067 MUNFLAG
033508,000066: 32,3026 43014 CLEAR CLEAR
033509,000067: 32,3027 00266 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
033510,000068: 32,3030 00270 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
033511,000069:
033512,000070: # ****************************************
033513,000071:
033514,000072: 32,3031 77201 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
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Page 786
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033516,000074: 32,3032 00001 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
033517,000075: 32,3033 02023 RLS # AT 6D ESTIMATED TIME OF LANDING
033518,000076: 32,3034 41525 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
033519,000077: 32,3035 02401 TLAND
033520,000078: 32,3036 37625 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
033521,000079: 32,3037 55716 RP-TO-R
033522,000080: 32,3040 64312 VSL4 MXV
033523,000081: 32,3041 01734 REFSMMAT
033524,000082: 32,3042 37635 STCALL LAND
033525,000083: 32,3043 46432 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
033526,000084: 32,3044 45345 DLOAD DSU
033527,000085: 32,3045 02401 TLAND
033528,000086: 32,3046 25260 GUIDDURN
033529,000087: 32,3047 34041 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
033530,000088: 32,3050 27057 LEMPREC
033531,000089: 32,3051 77331 SSP VLOAD
033532,000090: 32,3052 03647 NIGNLOOP
033533,000091: 32,3053 00050 40D
033534,000092: 32,3054 06520 UNITX
033535,000093: 32,3055 26603 STOVL CG
033536,000094: 32,3056 06516 UNITY
033537,000095: 32,3057 26611 STOVL CG +6
033538,000096: 32,3060 06514 UNITZ
033539,000097: 32,3061 16617 STODL CG +14
033540,000098: 32,3062 25256 99999CON
033541,000099: 32,3063 27665 STOVL DELTAH # INITIALIZE DELTAH FOR V16N68 DISPLAY
033542,000100: 32,3064 06522 ZEROVECS
033543,000101: 32,3065 17254 STODL UNFC/2 # INITIALIZE TRIM VELOCITY CORRECTION TERM
033544,000102: 32,3066 06522 HI6ZEROS
033545,000103: 32,3067 03643 STORE TTF/8
033546,000104:
033547,000105: 32,3070 77745 IGNALOOP DLOAD
033548,000106: 32,3071 00015 TAT
033549,000107: 32,3072 27561 STOVL PIPTIME1
033550,000108: 32,3073 00017 RATT1
033551,000109: 32,3074 64312 VSL4 MXV
033552,000110: 32,3075 01734 REFSMMAT
033553,000111: 32,3076 37521 STCALL R
033554,000112: 32,3077 67130 MUNGRAV
033555,000113: 32,3100 35237 STCALL GDT/2
033556,000114: 32,3101 62454 ?GUIDSUB # WHICH DELIVERS N PASSES OF GUIDANCE
033557,000115:
033558,000116: # DDUMCALC IS PROGRAMMED AS FOLLOWS:-
033559,000117: # 2 -
033560,000118: # (RIGNZ - RGU )/16 + 16(RGU )KIGNY/B8 + (RGU - RIGNX)KIGNX/B4 + (ABVAL(VGU) - VIGN)KIGNV/B4
033561,000119: # 2 1 0
033562,000120: # DDUM = -------------------------------------------------------------------------------------------
033563,000121: # 10
033564,000122: # 2 (VGU - 16 VGU KIGNX/B4)
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Page 787
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033566,000124: # 2 0
033567,000125: # THE NUMERATOR IS SCALED IN METERS AT 2(28). THE DENOMINATOR IS A VELOCITY IN UNITS OF 2(10) M/CS.
033568,000126: # THE QUOTIENT IS THUS A TIME IN UNITS OF 2(18) CENTISECONDS. THE FINAL SHIFT RESCALES TO UNITS OF 2(28) CS.
033569,000127: # THERE IS NO DAMPING FACTOR. THE CONSTANTS KIGNX/B4, KIGNY/B8 AND KIGNV/B4 ARE ALL NEGATIVE IN SIGN.
033570,000128:
033571,000129: 32,3102 55646 DDUMCALC TS NIGNLOOP
033572,000130: 32,3103 06037 TC INTPRET
033573,000131: 32,3104 57345 DLOAD DMPR # FORM DENOMINATOR FIRST
033574,000132: 32,3105 03627 VGU
033575,000133: 32,3106 02501 KIGNX/B4
033576,000134: 32,3107 44232 SL4R BDSU
033577,000135: 32,3110 03633 VGU +4
033578,000136: 32,3111 45325 PDDL DSU
033579,000137: 32,3112 02477 RIGNZ
033580,000138: 32,3113 02643 RGU +4
033581,000139: 32,3114 65222 SR4R PDDL
033582,000140: 32,3115 02641 RGU +2
033583,000141: 32,3116 57316 DSQ DMPR
033584,000142: 32,3117 02503 KIGNY/B8
033585,000143: 32,3120 65232 SL4R PDDL
033586,000144: 32,3121 02637 RGU
033587,000145: 32,3122 57225 DSU DMPR
033588,000146: 32,3123 02475 RIGNX
033589,000147: 32,3124 02501 KIGNX/B4
033590,000148: 32,3125 51515 PDVL ABVAL
033591,000149: 32,3126 03627 VGU
033592,000150: 32,3127 57225 DSU DMPR
033593,000151: 32,3130 02473 VIGN
033594,000152: 32,3131 02505 KIGNV/B4
033595,000153: 32,3132 43215 DAD DAD
033596,000154: 32,3133 56215 DAD DDV
033597,000155: 32,3134 77661 SRR
033598,000156: 32,3135 21613 10D
033599,000157:
033600,000158: 32,3136 43206 PUSH DAD
033601,000159: 32,3137 03561 PIPTIME1
033602,000160: 32,3140 14041 STODL TDEC1 # STORE NEW GUESS FOR NEXT INTEGRATION
033603,000161: 32,3141 45246 ABS DSU
033604,000162: 32,3142 25262 DDUMCRIT
033605,000163: 32,3143 45040 BMN CALL
033606,000164: 32,3144 65163 DDUMGOOD
033607,000165: 32,3145 27414 INTSTALL
033608,000166: 32,3146 43014 SET SET
033609,000167: 32,3147 01473 INTYPFLG
033610,000168: 32,3150 00063 MOONFLAG
033611,000169: 32,3151 77745 DLOAD
033612,000170: 32,3152 03561 PIPTIME1
033613,000171: 32,3153 25517 STOVL TET # HOPEFULLY ?GUIDSUB DID NOT
033614,000172: 32,3154 00017 RATT1 # CLOBBER RATT1 AND VATT1
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Page 788
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033616,000174: 32,3155 25535 STOVL RCV
033617,000175: 32,3156 00025 VATT1
033618,000176: 32,3157 35543 STCALL VCV
033619,000177: 32,3160 27107 INTEGRVS
033620,000178: 32,3161 77650 GOTO
033621,000179: 32,3162 65070 IGNALOOP
033622,000180:
033623,000181: 32,3163 54335 DDUMGOOD SLOAD SR
033624,000182: 32,3164 03423 ZOOMTIME
033625,000183: 32,3165 20617 14D
033626,000184: 32,3166 77621 BDSU
033627,000185: 32,3167 00041 TDEC1
033628,000186: 32,3170 27442 STOVL TIG # COMPUTE DISTANCE LANDING SITE WILL BE
033629,000187: 32,3171 03527 V # OUT OF LM'S ORBITAL PLANE AT IGNITION:
033630,000188: 32,3172 53435 VXV UNIT # SIGN IS + IF LANDING SITE IS TO THE
033631,000189: 32,3173 03521 R # RIGHT, NORTH; - IF TO THE LEFT, SOUTH.
033632,000190: 32,3174 72441 DOT SL1
033633,000191: 32,3175 03635 LAND
033634,000192: 32,3176 26627 R60INIT STOVL OUTOFPLN # INITIALIZATION FOR CALCMANU
033635,000193: 32,3177 03254 UNFC/2
033636,000194: 32,3200 02631 STORE R60VSAVE # STORE UNFC/2 TEMPORARILY IN R60SAVE
033637,000195: 32,3201 77776 EXIT
033638,000196: # ****************************************
033639,000197:
033640,000198: 32,3202 05353 IGNALGRT TC PHASCHNG # PREVENT REPEATING IGNALG
033641,000199: 32,3203 04024 OCT 04024
033642,000200:
033643,000201: 32,3204 44362 ASTNCLOK CS ASTNDEX
033644,000202: 32,3205 04616 TC BANKCALL
033645,000203: 32,3206 74664 CADR STCLOK2
033646,000204: 32,3207 15155 TCF ENDOFJOB # RETURN IN NEW JOB AND IN EBANK FIVE
033647,000205:
033648,000206: 32,3210 06037 ASTNRET TC INTPRET
033649,000207: 32,3211 47131 SSP RTB # GO PICK UP DISPLAY AT END OF R51:
033650,000208: 32,3212 02747 QMAJ # "PROCEED" WILL DO A FINE ALIGNMENT
033651,000209: 32,3213 65215 FCADR P63SPOT2 # "ENTER" WILL RETURN TO P63SPOT2
033652,000210: 32,3214 31135 R51P63
033653,000211: 32,3215 53575 P63SPOT2 VLOAD UNIT # INITIALIZE KALCMANU FOR BURN ATTITUDE
033654,000212: 32,3216 02631 R60VSAVE
033655,000213: 32,3217 27773 STOVL POINTVSM
033656,000214: 32,3220 06520 UNITX
033657,000215: 32,3221 03765 STORE SCAXIS
033658,000216: 32,3222 77776 EXIT
033659,000217:
033660,000218: 32,3223 35016 CAF EBANK7
033661,000219: 32,3224 54003 TS EBANK
033662,000220:
033663,000221: 32,3225 00004 INHINT
033664,000222: 32,3226 04674 TC IBNKCALL
033665,000223: 32,3227 40142 CADR PFLITEDB
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Page 789
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033667,000225: 32,3230 00003 RELINT
033668,000226:
033669,000227: 32,3231 04616 TC BANKCALL
033670,000228: 32,3232 54123 CADR R60LEM
033671,000229:
033672,000230: 32,3233 05353 TC PHASCHNG # PREVENT RECALLING R60
033673,000231: 32,3234 04024 OCT 04024
033674,000232:
033675,000233: 32,3235 34746 P63SPOT3 CA BIT6 # IS THE LR ANTENNA IN POSITION 1 YET
033676,000234: 32,3236 00006 EXTEND
033677,000235: 32,3237 02033 RAND CHAN33
033678,000236: 32,3240 00006 EXTEND
033679,000237: 32,3241 13247 BZF P63SPOT4 # BRANCH IF ANTENNA ALREADY IN POSITION 1
033680,000238:
033681,000239: 32,3242 33254 CAF CODE500 # ASTRONAUT: PLEASE CRANK THE
033682,000240: 32,3243 04616 TC BANKCALL # SILLY THING AROUND
033683,000241: 32,3244 20623 CADR GOPERF1
033684,000242: 32,3245 16001 TCF GOTOPOOH # TERMINATE
033685,000243: 32,3246 13235 TCF P63SPOT3 # PROCEED SEE IF HE'S LYING
033686,000244:
033687,000245: 32,3247 04616 P63SPOT4 TC BANKCALL # ENTER INITIALIZE LANDING RADAR
033688,000246: 32,3250 67701 CADR SETPOS1
033689,000247:
033690,000248: 32,3251 04635 TC POSTJUMP # OFF TO SEE THE WIZARD ...
033691,000249: 32,3252 74126 CADR BURNBABY
033692,000250:
033693,000251: # ----------------------------------------
033694,000252:
033695,000253: # CONSTANTS FOR P63LM AND IGNALG
033696,000254:
033697,000255: 32,3253 02076 P63ADRES GENADR P63TABLE
033698,000256:
033699,000257: 32,3254 4362 ASTNDEX = MD1 # OCT 25; INDEX FOR CLOKTASK
033700,000258:
033701,000259: 32,3254 00500 CODE500 OCT 00500
033702,000260:
033703,000261: 32,3255 00035 30373 99999CON 2DEC 30479.7 B-24
033704,000262:
033705,000263: 32,3257 00004 01610 GUIDDURN 2DEC +66440 B-28 # GUIDDURN +6.64400314 E+2
033706,000264: 32,3261 00000 00010 DDUMCRIT 2DEC +8 B-28 # CRITERION FOR IGNALG CONVERGENCE
033707,000265:
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Page 790
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033709,000267: # ----------------------------------------
033710,000268:
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Page 791
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033712,000270: # ****************************************
033713,000271: # P68: LANDING CONFIRMATION
033714,000272: # ****************************************
033715,000273:
033716,000274: 31,2144 BANK 31
033717,000275: 31,2000 SETLOC F2DPS*31
033718,000276: 31,2000 BANK
033719,000277:
033720,000278: 31,2144 COUNT* $$/P6567
033721,000279:
033722,000280: 31,2144 05353 LANDJUNK TC PHASCHNG
033723,000281: 31,2145 04024 OCT 04024
033724,000282:
033725,000283: 31,2146 00004 INHINT
033726,000284: 31,2147 04616 TC BANKCALL # ZERO ATTITUDE ERROR
033727,000285: 31,2150 40153 CADR ZATTEROR
033728,000286:
033729,000287: 31,2151 04616 TC BANKCALL # SET 5 DEGREE DEADBAND
033730,000288: 31,2152 40127 CADR SETMAXDB
033731,000289:
033732,000290: 31,2153 06037 TC INTPRET # TO INTERPRETIVE AS TIME IS NOT CRITICAL
033733,000291: 31,2154 43014 SET CLEAR
033734,000292: 31,2155 04067 SURFFLAG
033735,000293: 31,2156 04666 LETABORT
033736,000294: 31,2157 77214 SET VLOAD
033737,000295: 31,2160 05062 APSFLAG
033738,000296: 31,2161 01221 RN
033739,000297: 31,2162 16032 STODL ALPHAV
033740,000298: 31,2163 01235 PIPTIME
033741,000299: 31,2164 45014 SET CALL
033742,000300: 31,2165 01463 LUNAFLAG
033743,000301: 31,2166 26351 LAT-LONG
033744,000302: 31,2167 77201 SETPD VLOAD # COMPUTE RLS AND STORE IT AWAY
033745,000303: 31,2170 00001 0
033746,000304: 31,2171 01221 RN
033747,000305: 31,2172 65352 VSL2 PDDL
033748,000306: 31,2173 01235 PIPTIME
033749,000307: 31,2174 45006 PUSH CALL
033750,000308: 31,2175 51670 R-TO-RP
033751,000309: 31,2176 02023 STORE RLS
033752,000310: 31,2177 77776 EXIT
033753,000311: 31,2200 32215 CAF V06N43* # ASTRONAUT: NOW LOOK WHERE YOU ENDED UP
033754,000312: 31,2201 04616 TC BANKCALL
033755,000313: 31,2202 20476 CADR GOFLASH
033756,000314: 31,2203 16001 TCF GOTOPOOH # TERMINATE
033757,000315: 31,2204 12206 TCF +2 # PROCEED
033758,000316: 31,2205 12200 TCF -5 # RECYCLE
033759,000317:
033760,000318: 31,2206 06037 TC INTPRET
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Page 792
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033762,000320: 31,2207 77775 VLOAD # INITIALIZE GSAV AND (USING REFMF)
033763,000321: 31,2210 06520 UNITX # YNBSAV, ZNBSAV AND ATTFLAG FOR P57
033764,000322: 31,2211 36231 STCALL GSAV
033765,000323: 31,2212 33506 REFMF
033766,000324: 31,2213 77776 EXIT
033767,000325:
033768,000326: 31,2214 16001 TCF GOTOPOOH # ASTRONAUT: PLEASE SELECT P57
033769,000327:
033770,000328: 31,2215 01453 V06N43* VN 0643
033771,000329:
End of include-file THE_LUNAR_LANDING.agc. Parent file is MAIN.agc