Source Code
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These source-code files are part of a reconstructed copy of Luminary 98, a
development version 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 memo 85, using asterisks
indicating changed lines in the listing as a guide. While no listing of this
version is known to exist, nor are the memory-bank checksums available,
the reconstruction is believed to be correct because it was an an intermediate
step in reconstructing Luminary 97 whose reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152G.
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 98 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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033291,000002: ## Copyright: Public domain.
033292,000003: ## Filename: THE_LUNAR_LANDING.agc
033293,000004: ## Purpose: A section of Luminary revision 98.
033294,000005: ## It is part of the reconstructed source code for the a
033295,000006: ## development version of the flight software for the Lunar
033296,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
033297,000008: ## The code has been recreated from a copy of Luminary 99
033298,000009: ## revision 001, using asterisks indicating changed lines in
033299,000010: ## the listing and Luminary Memo #85, which lists changes between
033300,000011: ## Luminary 98 and 99.
033301,000012: ## Reference: pp. 785-792
033302,000013: ## Assembler: yaYUL
033303,000014: ## Contact: Ron Burkey <info@sandroid.org>.
033304,000015: ## Website: www.ibiblio.org/apollo/index.html
033305,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
033306,000017:
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Page 785
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033308,000019: 32,2776 BANK 32
033309,000020: 32,2000 SETLOC F2DPS*32
033310,000021: 32,2000 BANK
033311,000022:
033312,000023: 32,2776 E7,1621 EBANK= E2DPS
033313,000024:
033314,000025: # ****************************************
033315,000026: # P63: THE LUNAR LANDING, BRAKING PHASE
033316,000027: # ****************************************
033317,000028:
033318,000029: 32,2776 COUNT* $$/P63
033319,000030:
033320,000031: 32,2776 05353 P63LM TC PHASCHNG
033321,000032: 32,2777 04024 OCT 04024
033322,000033:
033323,000034: 32,3000 04616 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
033324,000035: 32,3001 11254 CADR R02BOTH
033325,000036:
033326,000037: 32,3002 33253 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
033327,000038: 32,3003 55455 TS WHICH
033328,000039:
033329,000040: 32,3004 32000 CAF DPSTHRSH # INITIALIZE DVMON
033330,000041: 32,3005 55251 TS DVTHRUSH
033331,000042: 32,3006 34751 CAF FOUR
033332,000043: 32,3007 55515 TS DVCNTR
033333,000044:
033334,000045: 32,3010 44753 CS ONE # INITIALIZE WCHPHASE AND FLPASSO
033335,000046: 32,3011 55351 TS WCHPHASE
033336,000047:
033337,000048: 32,3012 34755 CA ZERO
033338,000049: 32,3013 55623 TS FLPASS0
033339,000050:
033340,000051: 32,3014 44736 CS BIT14
033341,000052: 32,3015 00006 EXTEND
033342,000053: 32,3016 03012 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
033343,000054:
033344,000055: 32,3017 06037 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
033345,000056: 32,3020 43014 CLEAR CLEAR
033346,000057: 32,3021 02663 NOTHROTL
033347,000058: 32,3022 03271 REDFLAG
033348,000059: 32,3023 43014 CLEAR SET
033349,000060: 32,3024 05660 LRBYPASS
033350,000061: 32,3025 03067 MUNFLAG
033351,000062: 32,3026 43014 CLEAR CLEAR
033352,000063: 32,3027 00266 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
033353,000064: 32,3030 00270 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
033354,000065:
033355,000066: # ****************************************
033356,000067:
033357,000068: 32,3031 77201 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
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Page 786
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033359,000070: 32,3032 00001 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
033360,000071: 32,3033 02023 RLS # AT 6D ESTIMATED TIME OF LANDING
033361,000072: 32,3034 41525 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
033362,000073: 32,3035 02401 TLAND
033363,000074: 32,3036 37625 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
033364,000075: 32,3037 55716 RP-TO-R
033365,000076: 32,3040 64312 VSL4 MXV
033366,000077: 32,3041 01734 REFSMMAT
033367,000078: 32,3042 37635 STCALL LAND
033368,000079: 32,3043 46432 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
033369,000080: 32,3044 45345 DLOAD DSU
033370,000081: 32,3045 02401 TLAND
033371,000082: 32,3046 25260 GUIDDURN
033372,000083: 32,3047 34041 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
033373,000084: 32,3050 27057 LEMPREC
033374,000085: 32,3051 77331 SSP VLOAD
033375,000086: 32,3052 03647 NIGNLOOP
033376,000087: 32,3053 00050 40D
033377,000088: 32,3054 06520 UNITX
033378,000089: 32,3055 26603 STOVL CG
033379,000090: 32,3056 06516 UNITY
033380,000091: 32,3057 26611 STOVL CG +6
033381,000092: 32,3060 06514 UNITZ
033382,000093: 32,3061 16617 STODL CG +14
033383,000094: 32,3062 25256 99999CON
033384,000095: 32,3063 27665 STOVL DELTAH # INITIALIZE DELTAH FOR V16N68 DISPLAY
033385,000096: 32,3064 06522 ZEROVECS
033386,000097: 32,3065 17254 STODL UNFC/2 # INITIALIZE TRIM VELOCITY CORRECTION TERM
033387,000098: 32,3066 06522 HI6ZEROS
033388,000099: 32,3067 03643 STORE TTF/8
033389,000100:
033390,000101: 32,3070 77745 IGNALOOP DLOAD
033391,000102: 32,3071 00015 TAT
033392,000103: 32,3072 27561 STOVL PIPTIME1
033393,000104: 32,3073 00017 RATT1
033394,000105: 32,3074 64312 VSL4 MXV
033395,000106: 32,3075 01734 REFSMMAT
033396,000107: 32,3076 37521 STCALL R
033397,000108: 32,3077 67130 MUNGRAV
033398,000109: 32,3100 35237 STCALL GDT/2
033399,000110: 32,3101 62454 ?GUIDSUB # WHICH DELIVERS N PASSES OF GUIDANCE
033400,000111:
033401,000112: # DDUMCALC IS PROGRAMMED AS FOLLOWS:-
033402,000113: # 2 -
033403,000114: # (RIGNZ - RGU )/16 + 16(RGU )KIGNY/B8 + (RGU - RIGNX)KIGNX/B4 + (ABVAL(VGU) - VIGN)KIGNV/B4
033404,000115: # 2 1 0
033405,000116: # DDUM = -------------------------------------------------------------------------------------------
033406,000117: # 10
033407,000118: # 2 (VGU - 16 VGU KIGNX/B4)
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Page 787
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033409,000120: # 2 0
033410,000121: # THE NUMERATOR IS SCALED IN METERS AT 2(28). THE DENOMINATOR IS A VELOCITY IN UNITS OF 2(10) M/CS.
033411,000122: # THE QUOTIENT IS THUS A TIME IN UNITS OF 2(18) CENTISECONDS. THE FINAL SHIFT RESCALES TO UNITS OF 2(28) CS.
033412,000123: # THERE IS NO DAMPING FACTOR. THE CONSTANTS KIGNX/B4, KIGNY/B8 AND KIGNV/B4 ARE ALL NEGATIVE IN SIGN.
033413,000124:
033414,000125: 32,3102 55646 DDUMCALC TS NIGNLOOP
033415,000126: 32,3103 06037 TC INTPRET
033416,000127: 32,3104 57345 DLOAD DMPR # FORM DENOMINATOR FIRST
033417,000128: 32,3105 03627 VGU
033418,000129: 32,3106 02501 KIGNX/B4
033419,000130: 32,3107 44232 SL4R BDSU
033420,000131: 32,3110 03633 VGU +4
033421,000132: 32,3111 45325 PDDL DSU
033422,000133: 32,3112 02477 RIGNZ
033423,000134: 32,3113 02643 RGU +4
033424,000135: 32,3114 65222 SR4R PDDL
033425,000136: 32,3115 02641 RGU +2
033426,000137: 32,3116 57316 DSQ DMPR
033427,000138: 32,3117 02503 KIGNY/B8
033428,000139: 32,3120 65232 SL4R PDDL
033429,000140: 32,3121 02637 RGU
033430,000141: 32,3122 57225 DSU DMPR
033431,000142: 32,3123 02475 RIGNX
033432,000143: 32,3124 02501 KIGNX/B4
033433,000144: 32,3125 51515 PDVL ABVAL
033434,000145: 32,3126 03627 VGU
033435,000146: 32,3127 57225 DSU DMPR
033436,000147: 32,3130 02473 VIGN
033437,000148: 32,3131 02505 KIGNV/B4
033438,000149: 32,3132 43215 DAD DAD
033439,000150: 32,3133 56215 DAD DDV
033440,000151: 32,3134 77661 SRR
033441,000152: 32,3135 21613 10D
033442,000153:
033443,000154: 32,3136 43206 PUSH DAD
033444,000155: 32,3137 03561 PIPTIME1
033445,000156: 32,3140 14041 STODL TDEC1 # STORE NEW GUESS FOR NEXT INTEGRATION
033446,000157: 32,3141 45246 ABS DSU
033447,000158: 32,3142 25262 DDUMCRIT
033448,000159: 32,3143 45040 BMN CALL
033449,000160: 32,3144 65163 DDUMGOOD
033450,000161: 32,3145 27414 INTSTALL
033451,000162: 32,3146 43014 SET SET
033452,000163: 32,3147 01473 INTYPFLG
033453,000164: 32,3150 00063 MOONFLAG
033454,000165: 32,3151 77745 DLOAD
033455,000166: 32,3152 03561 PIPTIME1
033456,000167: 32,3153 25517 STOVL TET # HOPEFULLY ?GUIDSUB DID NOT
033457,000168: 32,3154 00017 RATT1 # CLOBBER RATT1 AND VATT1
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Page 788
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033459,000170: 32,3155 25535 STOVL RCV
033460,000171: 32,3156 00025 VATT1
033461,000172: 32,3157 35543 STCALL VCV
033462,000173: 32,3160 27107 INTEGRVS
033463,000174: 32,3161 77650 GOTO
033464,000175: 32,3162 65070 IGNALOOP
033465,000176:
033466,000177: 32,3163 54335 DDUMGOOD SLOAD SR
033467,000178: 32,3164 03423 ZOOMTIME
033468,000179: 32,3165 20617 14D
033469,000180: 32,3166 77621 BDSU
033470,000181: 32,3167 00041 TDEC1
033471,000182: 32,3170 27442 STOVL TIG # COMPUTE DISTANCE LANDING SITE WILL BE
033472,000183: 32,3171 03527 V # OUT OF LM'S ORBITAL PLANE AT IGNITION:
033473,000184: 32,3172 53435 VXV UNIT # SIGN IS + IF LANDING SITE IS TO THE
033474,000185: 32,3173 03521 R # RIGHT, NORTH; - IF TO THE LEFT, SOUTH.
033475,000186: 32,3174 72441 DOT SL1
033476,000187: 32,3175 03635 LAND
033477,000188: 32,3176 26627 R60INIT STOVL OUTOFPLN # INITIALIZATION FOR CALCMANU
033478,000189: 32,3177 03254 UNFC/2
033479,000190: 32,3200 02631 STORE R60VSAVE # STORE UNFC/2 TEMPORARILY IN R60SAVE
033480,000191: 32,3201 77776 EXIT
033481,000192: # ****************************************
033482,000193:
033483,000194: 32,3202 05353 IGNALGRT TC PHASCHNG # PREVENT REPEATING IGNALG
033484,000195: 32,3203 04024 OCT 04024
033485,000196:
033486,000197: 32,3204 44362 ASTNCLOK CS ASTNDEX
033487,000198: 32,3205 04616 TC BANKCALL
033488,000199: 32,3206 74664 CADR STCLOK2
033489,000200: 32,3207 15155 TCF ENDOFJOB # RETURN IN NEW JOB AND IN EBANK FIVE
033490,000201:
033491,000202: 32,3210 06037 ASTNRET TC INTPRET
033492,000203: 32,3211 47131 SSP RTB # GO PICK UP DISPLAY AT END OF R51:
033493,000204: 32,3212 02747 QMAJ # "PROCEED" WILL DO A FINE ALIGNMENT
033494,000205: 32,3213 65215 FCADR P63SPOT2 # "ENTER" WILL RETURN TO P63SPOT2
033495,000206: 32,3214 31135 R51P63
033496,000207: 32,3215 53575 P63SPOT2 VLOAD UNIT # INITIALIZE KALCMANU FOR BURN ATTITUDE
033497,000208: 32,3216 02631 R60VSAVE
033498,000209: 32,3217 27773 STOVL POINTVSM
033499,000210: 32,3220 06520 UNITX
033500,000211: 32,3221 03765 STORE SCAXIS
033501,000212: 32,3222 77776 EXIT
033502,000213:
033503,000214: 32,3223 35016 CAF EBANK7
033504,000215: 32,3224 54003 TS EBANK
033505,000216:
033506,000217: 32,3225 00004 INHINT
033507,000218: 32,3226 04674 TC IBNKCALL
033508,000219: 32,3227 40142 CADR PFLITEDB
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Page 789
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033510,000221: 32,3230 00003 RELINT
033511,000222:
033512,000223: 32,3231 04616 TC BANKCALL
033513,000224: 32,3232 54123 CADR R60LEM
033514,000225:
033515,000226: 32,3233 05353 TC PHASCHNG # PREVENT RECALLING R60
033516,000227: 32,3234 04024 OCT 04024
033517,000228:
033518,000229: 32,3235 34746 P63SPOT3 CA BIT6 # IS THE LR ANTENNA IN POSITION 1 YET
033519,000230: 32,3236 00006 EXTEND
033520,000231: 32,3237 02033 RAND CHAN33
033521,000232: 32,3240 00006 EXTEND
033522,000233: 32,3241 13247 BZF P63SPOT4 # BRANCH IF ANTENNA ALREADY IN POSITION 1
033523,000234:
033524,000235: 32,3242 33254 CAF CODE500 # ASTRONAUT: PLEASE CRANK THE
033525,000236: 32,3243 04616 TC BANKCALL # SILLY THING AROUND
033526,000237: 32,3244 20623 CADR GOPERF1
033527,000238: 32,3245 16001 TCF GOTOPOOH # TERMINATE
033528,000239: 32,3246 13235 TCF P63SPOT3 # PROCEED SEE IF HE'S LYING
033529,000240:
033530,000241: 32,3247 04616 P63SPOT4 TC BANKCALL # ENTER INITIALIZE LANDING RADAR
033531,000242: 32,3250 67701 CADR SETPOS1
033532,000243:
033533,000244: 32,3251 04635 TC POSTJUMP # OFF TO SEE THE WIZARD ...
033534,000245: 32,3252 74126 CADR BURNBABY
033535,000246:
033536,000247: # ----------------------------------------
033537,000248:
033538,000249: # CONSTANTS FOR P63LM AND IGNALG
033539,000250:
033540,000251: 32,3253 02076 P63ADRES GENADR P63TABLE
033541,000252:
033542,000253: 32,3254 4362 ASTNDEX = MD1 # OCT 25; INDEX FOR CLOKTASK
033543,000254:
033544,000255: 32,3254 00500 CODE500 OCT 00500
033545,000256:
033546,000257: 32,3255 00035 30373 99999CON 2DEC 30479.7 B-24
033547,000258:
033548,000259: 32,3257 00004 01610 GUIDDURN 2DEC +66440 B-28 # GUIDDURN +6.64400314 E+2
033549,000260: 32,3261 00000 00010 DDUMCRIT 2DEC +8 B-28 # CRITERION FOR IGNALG CONVERGENCE
033550,000261:
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Page 790
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033552,000263: # ----------------------------------------
033553,000264:
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Page 791
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033555,000266: # ****************************************
033556,000267: # P68: LANDING CONFIRMATION
033557,000268: # ****************************************
033558,000269:
033559,000270: 31,2144 BANK 31
033560,000271: 31,2000 SETLOC F2DPS*31
033561,000272: 31,2000 BANK
033562,000273:
033563,000274: 31,2144 COUNT* $$/P6567
033564,000275:
033565,000276: 31,2144 05353 LANDJUNK TC PHASCHNG
033566,000277: 31,2145 04024 OCT 04024
033567,000278:
033568,000279: 31,2146 00004 INHINT
033569,000280: 31,2147 04616 TC BANKCALL # ZERO ATTITUDE ERROR
033570,000281: 31,2150 40153 CADR ZATTEROR
033571,000282:
033572,000283: 31,2151 04616 TC BANKCALL # SET 5 DEGREE DEADBAND
033573,000284: 31,2152 40127 CADR SETMAXDB
033574,000285:
033575,000286: 31,2153 06037 TC INTPRET # TO INTERPRETIVE AS TIME IS NOT CRITICAL
033576,000287: 31,2154 43014 SET CLEAR
033577,000288: 31,2155 04067 SURFFLAG
033578,000289: 31,2156 04666 LETABORT
033579,000290: 31,2157 77214 SET VLOAD
033580,000291: 31,2160 05062 APSFLAG
033581,000292: 31,2161 01221 RN
033582,000293: 31,2162 16032 STODL ALPHAV
033583,000294: 31,2163 01235 PIPTIME
033584,000295: 31,2164 45014 SET CALL
033585,000296: 31,2165 01463 LUNAFLAG
033586,000297: 31,2166 26351 LAT-LONG
033587,000298: 31,2167 77201 SETPD VLOAD # COMPUTE RLS AND STORE IT AWAY
033588,000299: 31,2170 00001 0
033589,000300: 31,2171 01221 RN
033590,000301: 31,2172 65352 VSL2 PDDL
033591,000302: 31,2173 01235 PIPTIME
033592,000303: 31,2174 45006 PUSH CALL
033593,000304: 31,2175 51670 R-TO-RP
033594,000305: 31,2176 02023 STORE RLS
033595,000306: 31,2177 77776 EXIT
033596,000307: 31,2200 32215 CAF V06N43* # ASTRONAUT: NOW LOOK WHERE YOU ENDED UP
033597,000308: 31,2201 04616 TC BANKCALL
033598,000309: 31,2202 20476 CADR GOFLASH
033599,000310: 31,2203 16001 TCF GOTOPOOH # TERMINATE
033600,000311: 31,2204 12206 TCF +2 # PROCEED
033601,000312: 31,2205 12200 TCF -5 # RECYCLE
033602,000313:
033603,000314: 31,2206 06037 TC INTPRET
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Page 792
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033605,000316: 31,2207 77775 VLOAD # INITIALIZE GSAV AND (USING REFMF)
033606,000317: 31,2210 06520 UNITX # YNBSAV, ZNBSAV AND ATTFLAG FOR P57
033607,000318: 31,2211 36231 STCALL GSAV
033608,000319: 31,2212 33506 REFMF
033609,000320: 31,2213 77776 EXIT
033610,000321:
033611,000322: 31,2214 16001 TCF GOTOPOOH # ASTRONAUT: PLEASE SELECT P57
033612,000323:
033613,000324: 31,2215 01453 V06N43* VN 0643
033614,000325:
End of include-file THE_LUNAR_LANDING.agc. Parent file is MAIN.agc