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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033278,000002: ## Copyright: Public domain.
033279,000003: ## Filename: THE_LUNAR_LANDING.agc
033280,000004: ## Purpose: A section of Luminary revision 98.
033281,000005: ## It is part of the reconstructed source code for the a
033282,000006: ## development version of the flight software for the Lunar
033283,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
033284,000008: ## The code has been recreated from a copy of Luminary 99
033285,000009: ## revision 001, using asterisks indicating changed lines in
033286,000010: ## the listing and Luminary Memo #85, which lists changes between
033287,000011: ## Luminary 98 and 99.
033288,000012: ## Reference: pp. 785-792
033289,000013: ## Assembler: yaYUL
033290,000014: ## Contact: Ron Burkey <info@sandroid.org>.
033291,000015: ## Website: www.ibiblio.org/apollo/index.html
033292,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
033293,000017:
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Page 785
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033295,000019: 32,2776 BANK 32
033296,000020: 32,2000 SETLOC F2DPS*32
033297,000021: 32,2000 BANK
033298,000022:
033299,000023: 32,2776 E7,1621 EBANK= E2DPS
033300,000024:
033301,000025: # ****************************************
033302,000026: # P63: THE LUNAR LANDING, BRAKING PHASE
033303,000027: # ****************************************
033304,000028:
033305,000029: 32,2776 COUNT* $$/P63
033306,000030:
033307,000031: 32,2776 05353 P63LM TC PHASCHNG
033308,000032: 32,2777 04024 OCT 04024
033309,000033:
033310,000034: 32,3000 04616 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
033311,000035: 32,3001 11254 CADR R02BOTH
033312,000036:
033313,000037: 32,3002 33253 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
033314,000038: 32,3003 55455 TS WHICH
033315,000039:
033316,000040: 32,3004 32000 CAF DPSTHRSH # INITIALIZE DVMON
033317,000041: 32,3005 55251 TS DVTHRUSH
033318,000042: 32,3006 34751 CAF FOUR
033319,000043: 32,3007 55515 TS DVCNTR
033320,000044:
033321,000045: 32,3010 44753 CS ONE # INITIALIZE WCHPHASE AND FLPASSO
033322,000046: 32,3011 55351 TS WCHPHASE
033323,000047:
033324,000048: 32,3012 34755 CA ZERO
033325,000049: 32,3013 55623 TS FLPASS0
033326,000050:
033327,000051: 32,3014 44736 CS BIT14
033328,000052: 32,3015 00006 EXTEND
033329,000053: 32,3016 03012 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
033330,000054:
033331,000055: 32,3017 06037 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
033332,000056: 32,3020 43014 CLEAR CLEAR
033333,000057: 32,3021 02663 NOTHROTL
033334,000058: 32,3022 03271 REDFLAG
033335,000059: 32,3023 43014 CLEAR SET
033336,000060: 32,3024 05660 LRBYPASS
033337,000061: 32,3025 03067 MUNFLAG
033338,000062: 32,3026 43014 CLEAR CLEAR
033339,000063: 32,3027 00266 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
033340,000064: 32,3030 00270 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
033341,000065:
033342,000066: # ****************************************
033343,000067:
033344,000068: 32,3031 77201 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
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Page 786
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033346,000070: 32,3032 00001 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
033347,000071: 32,3033 02023 RLS # AT 6D ESTIMATED TIME OF LANDING
033348,000072: 32,3034 41525 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
033349,000073: 32,3035 02401 TLAND
033350,000074: 32,3036 37625 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
033351,000075: 32,3037 55716 RP-TO-R
033352,000076: 32,3040 64312 VSL4 MXV
033353,000077: 32,3041 01734 REFSMMAT
033354,000078: 32,3042 37635 STCALL LAND
033355,000079: 32,3043 46432 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
033356,000080: 32,3044 45345 DLOAD DSU
033357,000081: 32,3045 02401 TLAND
033358,000082: 32,3046 25260 GUIDDURN
033359,000083: 32,3047 34041 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
033360,000084: 32,3050 27057 LEMPREC
033361,000085: 32,3051 77331 SSP VLOAD
033362,000086: 32,3052 03647 NIGNLOOP
033363,000087: 32,3053 00050 40D
033364,000088: 32,3054 06520 UNITX
033365,000089: 32,3055 26603 STOVL CG
033366,000090: 32,3056 06516 UNITY
033367,000091: 32,3057 26611 STOVL CG +6
033368,000092: 32,3060 06514 UNITZ
033369,000093: 32,3061 16617 STODL CG +14
033370,000094: 32,3062 25256 99999CON
033371,000095: 32,3063 27665 STOVL DELTAH # INITIALIZE DELTAH FOR V16N68 DISPLAY
033372,000096: 32,3064 06522 ZEROVECS
033373,000097: 32,3065 17254 STODL UNFC/2 # INITIALIZE TRIM VELOCITY CORRECTION TERM
033374,000098: 32,3066 06522 HI6ZEROS
033375,000099: 32,3067 03643 STORE TTF/8
033376,000100:
033377,000101: 32,3070 77745 IGNALOOP DLOAD
033378,000102: 32,3071 00015 TAT
033379,000103: 32,3072 27561 STOVL PIPTIME1
033380,000104: 32,3073 00017 RATT1
033381,000105: 32,3074 64312 VSL4 MXV
033382,000106: 32,3075 01734 REFSMMAT
033383,000107: 32,3076 37521 STCALL R
033384,000108: 32,3077 67130 MUNGRAV
033385,000109: 32,3100 35237 STCALL GDT/2
033386,000110: 32,3101 62454 ?GUIDSUB # WHICH DELIVERS N PASSES OF GUIDANCE
033387,000111:
033388,000112: # DDUMCALC IS PROGRAMMED AS FOLLOWS:-
033389,000113: # 2 -
033390,000114: # (RIGNZ - RGU )/16 + 16(RGU )KIGNY/B8 + (RGU - RIGNX)KIGNX/B4 + (ABVAL(VGU) - VIGN)KIGNV/B4
033391,000115: # 2 1 0
033392,000116: # DDUM = -------------------------------------------------------------------------------------------
033393,000117: # 10
033394,000118: # 2 (VGU - 16 VGU KIGNX/B4)
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Page 787
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033396,000120: # 2 0
033397,000121: # THE NUMERATOR IS SCALED IN METERS AT 2(28). THE DENOMINATOR IS A VELOCITY IN UNITS OF 2(10) M/CS.
033398,000122: # THE QUOTIENT IS THUS A TIME IN UNITS OF 2(18) CENTISECONDS. THE FINAL SHIFT RESCALES TO UNITS OF 2(28) CS.
033399,000123: # THERE IS NO DAMPING FACTOR. THE CONSTANTS KIGNX/B4, KIGNY/B8 AND KIGNV/B4 ARE ALL NEGATIVE IN SIGN.
033400,000124:
033401,000125: 32,3102 55646 DDUMCALC TS NIGNLOOP
033402,000126: 32,3103 06037 TC INTPRET
033403,000127: 32,3104 57345 DLOAD DMPR # FORM DENOMINATOR FIRST
033404,000128: 32,3105 03627 VGU
033405,000129: 32,3106 02501 KIGNX/B4
033406,000130: 32,3107 44232 SL4R BDSU
033407,000131: 32,3110 03633 VGU +4
033408,000132: 32,3111 45325 PDDL DSU
033409,000133: 32,3112 02477 RIGNZ
033410,000134: 32,3113 02643 RGU +4
033411,000135: 32,3114 65222 SR4R PDDL
033412,000136: 32,3115 02641 RGU +2
033413,000137: 32,3116 57316 DSQ DMPR
033414,000138: 32,3117 02503 KIGNY/B8
033415,000139: 32,3120 65232 SL4R PDDL
033416,000140: 32,3121 02637 RGU
033417,000141: 32,3122 57225 DSU DMPR
033418,000142: 32,3123 02475 RIGNX
033419,000143: 32,3124 02501 KIGNX/B4
033420,000144: 32,3125 51515 PDVL ABVAL
033421,000145: 32,3126 03627 VGU
033422,000146: 32,3127 57225 DSU DMPR
033423,000147: 32,3130 02473 VIGN
033424,000148: 32,3131 02505 KIGNV/B4
033425,000149: 32,3132 43215 DAD DAD
033426,000150: 32,3133 56215 DAD DDV
033427,000151: 32,3134 77661 SRR
033428,000152: 32,3135 21613 10D
033429,000153:
033430,000154: 32,3136 43206 PUSH DAD
033431,000155: 32,3137 03561 PIPTIME1
033432,000156: 32,3140 14041 STODL TDEC1 # STORE NEW GUESS FOR NEXT INTEGRATION
033433,000157: 32,3141 45246 ABS DSU
033434,000158: 32,3142 25262 DDUMCRIT
033435,000159: 32,3143 45040 BMN CALL
033436,000160: 32,3144 65163 DDUMGOOD
033437,000161: 32,3145 27414 INTSTALL
033438,000162: 32,3146 43014 SET SET
033439,000163: 32,3147 01473 INTYPFLG
033440,000164: 32,3150 00063 MOONFLAG
033441,000165: 32,3151 77745 DLOAD
033442,000166: 32,3152 03561 PIPTIME1
033443,000167: 32,3153 25517 STOVL TET # HOPEFULLY ?GUIDSUB DID NOT
033444,000168: 32,3154 00017 RATT1 # CLOBBER RATT1 AND VATT1
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Page 788
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033446,000170: 32,3155 25535 STOVL RCV
033447,000171: 32,3156 00025 VATT1
033448,000172: 32,3157 35543 STCALL VCV
033449,000173: 32,3160 27107 INTEGRVS
033450,000174: 32,3161 77650 GOTO
033451,000175: 32,3162 65070 IGNALOOP
033452,000176:
033453,000177: 32,3163 54335 DDUMGOOD SLOAD SR
033454,000178: 32,3164 03423 ZOOMTIME
033455,000179: 32,3165 20617 14D
033456,000180: 32,3166 77621 BDSU
033457,000181: 32,3167 00041 TDEC1
033458,000182: 32,3170 27442 STOVL TIG # COMPUTE DISTANCE LANDING SITE WILL BE
033459,000183: 32,3171 03527 V # OUT OF LM'S ORBITAL PLANE AT IGNITION:
033460,000184: 32,3172 53435 VXV UNIT # SIGN IS + IF LANDING SITE IS TO THE
033461,000185: 32,3173 03521 R # RIGHT, NORTH; - IF TO THE LEFT, SOUTH.
033462,000186: 32,3174 72441 DOT SL1
033463,000187: 32,3175 03635 LAND
033464,000188: 32,3176 26627 R60INIT STOVL OUTOFPLN # INITIALIZATION FOR CALCMANU
033465,000189: 32,3177 03254 UNFC/2
033466,000190: 32,3200 02631 STORE R60VSAVE # STORE UNFC/2 TEMPORARILY IN R60SAVE
033467,000191: 32,3201 77776 EXIT
033468,000192: # ****************************************
033469,000193:
033470,000194: 32,3202 05353 IGNALGRT TC PHASCHNG # PREVENT REPEATING IGNALG
033471,000195: 32,3203 04024 OCT 04024
033472,000196:
033473,000197: 32,3204 44362 ASTNCLOK CS ASTNDEX
033474,000198: 32,3205 04616 TC BANKCALL
033475,000199: 32,3206 74664 CADR STCLOK2
033476,000200: 32,3207 15155 TCF ENDOFJOB # RETURN IN NEW JOB AND IN EBANK FIVE
033477,000201:
033478,000202: 32,3210 06037 ASTNRET TC INTPRET
033479,000203: 32,3211 47131 SSP RTB # GO PICK UP DISPLAY AT END OF R51:
033480,000204: 32,3212 02747 QMAJ # "PROCEED" WILL DO A FINE ALIGNMENT
033481,000205: 32,3213 65215 FCADR P63SPOT2 # "ENTER" WILL RETURN TO P63SPOT2
033482,000206: 32,3214 31135 R51P63
033483,000207: 32,3215 53575 P63SPOT2 VLOAD UNIT # INITIALIZE KALCMANU FOR BURN ATTITUDE
033484,000208: 32,3216 02631 R60VSAVE
033485,000209: 32,3217 27773 STOVL POINTVSM
033486,000210: 32,3220 06520 UNITX
033487,000211: 32,3221 03765 STORE SCAXIS
033488,000212: 32,3222 77776 EXIT
033489,000213:
033490,000214: 32,3223 35016 CAF EBANK7
033491,000215: 32,3224 54003 TS EBANK
033492,000216:
033493,000217: 32,3225 00004 INHINT
033494,000218: 32,3226 04674 TC IBNKCALL
033495,000219: 32,3227 40142 CADR PFLITEDB
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Page 789
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033497,000221: 32,3230 00003 RELINT
033498,000222:
033499,000223: 32,3231 04616 TC BANKCALL
033500,000224: 32,3232 54123 CADR R60LEM
033501,000225:
033502,000226: 32,3233 05353 TC PHASCHNG # PREVENT RECALLING R60
033503,000227: 32,3234 04024 OCT 04024
033504,000228:
033505,000229: 32,3235 34746 P63SPOT3 CA BIT6 # IS THE LR ANTENNA IN POSITION 1 YET
033506,000230: 32,3236 00006 EXTEND
033507,000231: 32,3237 02033 RAND CHAN33
033508,000232: 32,3240 00006 EXTEND
033509,000233: 32,3241 13247 BZF P63SPOT4 # BRANCH IF ANTENNA ALREADY IN POSITION 1
033510,000234:
033511,000235: 32,3242 33254 CAF CODE500 # ASTRONAUT: PLEASE CRANK THE
033512,000236: 32,3243 04616 TC BANKCALL # SILLY THING AROUND
033513,000237: 32,3244 20623 CADR GOPERF1
033514,000238: 32,3245 16001 TCF GOTOPOOH # TERMINATE
033515,000239: 32,3246 13235 TCF P63SPOT3 # PROCEED SEE IF HE'S LYING
033516,000240:
033517,000241: 32,3247 04616 P63SPOT4 TC BANKCALL # ENTER INITIALIZE LANDING RADAR
033518,000242: 32,3250 67701 CADR SETPOS1
033519,000243:
033520,000244: 32,3251 04635 TC POSTJUMP # OFF TO SEE THE WIZARD ...
033521,000245: 32,3252 74126 CADR BURNBABY
033522,000246:
033523,000247: # ----------------------------------------
033524,000248:
033525,000249: # CONSTANTS FOR P63LM AND IGNALG
033526,000250:
033527,000251: 32,3253 02076 P63ADRES GENADR P63TABLE
033528,000252:
033529,000253: 32,3254 4362 ASTNDEX = MD1 # OCT 25; INDEX FOR CLOKTASK
033530,000254:
033531,000255: 32,3254 00500 CODE500 OCT 00500
033532,000256:
033533,000257: 32,3255 00035 30373 99999CON 2DEC 30479.7 B-24
033534,000258:
033535,000259: 32,3257 00004 01610 GUIDDURN 2DEC +66440 B-28 # GUIDDURN +6.64400314 E+2
033536,000260: 32,3261 00000 00010 DDUMCRIT 2DEC +8 B-28 # CRITERION FOR IGNALG CONVERGENCE
033537,000261:
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Page 790
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033539,000263: # ----------------------------------------
033540,000264:
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Page 791
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033542,000266: # ****************************************
033543,000267: # P68: LANDING CONFIRMATION
033544,000268: # ****************************************
033545,000269:
033546,000270: 31,2144 BANK 31
033547,000271: 31,2000 SETLOC F2DPS*31
033548,000272: 31,2000 BANK
033549,000273:
033550,000274: 31,2144 COUNT* $$/P6567
033551,000275:
033552,000276: 31,2144 05353 LANDJUNK TC PHASCHNG
033553,000277: 31,2145 04024 OCT 04024
033554,000278:
033555,000279: 31,2146 00004 INHINT
033556,000280: 31,2147 04616 TC BANKCALL # ZERO ATTITUDE ERROR
033557,000281: 31,2150 40153 CADR ZATTEROR
033558,000282:
033559,000283: 31,2151 04616 TC BANKCALL # SET 5 DEGREE DEADBAND
033560,000284: 31,2152 40127 CADR SETMAXDB
033561,000285:
033562,000286: 31,2153 06037 TC INTPRET # TO INTERPRETIVE AS TIME IS NOT CRITICAL
033563,000287: 31,2154 43014 SET CLEAR
033564,000288: 31,2155 04067 SURFFLAG
033565,000289: 31,2156 04666 LETABORT
033566,000290: 31,2157 77214 SET VLOAD
033567,000291: 31,2160 05062 APSFLAG
033568,000292: 31,2161 01221 RN
033569,000293: 31,2162 16032 STODL ALPHAV
033570,000294: 31,2163 01235 PIPTIME
033571,000295: 31,2164 45014 SET CALL
033572,000296: 31,2165 01463 LUNAFLAG
033573,000297: 31,2166 26351 LAT-LONG
033574,000298: 31,2167 77201 SETPD VLOAD # COMPUTE RLS AND STORE IT AWAY
033575,000299: 31,2170 00001 0
033576,000300: 31,2171 01221 RN
033577,000301: 31,2172 65352 VSL2 PDDL
033578,000302: 31,2173 01235 PIPTIME
033579,000303: 31,2174 45006 PUSH CALL
033580,000304: 31,2175 51670 R-TO-RP
033581,000305: 31,2176 02023 STORE RLS
033582,000306: 31,2177 77776 EXIT
033583,000307: 31,2200 32215 CAF V06N43* # ASTRONAUT: NOW LOOK WHERE YOU ENDED UP
033584,000308: 31,2201 04616 TC BANKCALL
033585,000309: 31,2202 20476 CADR GOFLASH
033586,000310: 31,2203 16001 TCF GOTOPOOH # TERMINATE
033587,000311: 31,2204 12206 TCF +2 # PROCEED
033588,000312: 31,2205 12200 TCF -5 # RECYCLE
033589,000313:
033590,000314: 31,2206 06037 TC INTPRET
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Page 792
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033592,000316: 31,2207 77775 VLOAD # INITIALIZE GSAV AND (USING REFMF)
033593,000317: 31,2210 06520 UNITX # YNBSAV, ZNBSAV AND ATTFLAG FOR P57
033594,000318: 31,2211 36231 STCALL GSAV
033595,000319: 31,2212 33506 REFMF
033596,000320: 31,2213 77776 EXIT
033597,000321:
033598,000322: 31,2214 16001 TCF GOTOPOOH # ASTRONAUT: PLEASE SELECT P57
033599,000323:
033600,000324: 31,2215 01453 V06N43* VN 0643
033601,000325:
End of include-file THE_LUNAR_LANDING.agc. Parent file is MAIN.agc