Source Code
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This is a reconstructed version of Luminary 130, the initial AGC program released
in November 1969 for the Apollo 13 LM. Three more releases
followed before the flown revision was finally manufactured in February 1970.
This reconstruction was created from a previous transcription of the original listing of
Luminary 131, combined with Luminary memo #129 which describes the small difference
between the Luminary 130 and 131. The reconstructed source code was verified by
matching memory-bank checksums to those listed for Luminary 130 in drawing 2021152G.
In this source code, program comments from the original (Luminary 131) code are
prefixed with '#', while those added later by the Virtual AGC project are prefixed
with '##'.
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033368,000002: ## Copyright: Public domain.
033369,000003: ## Filename: THE_LUNAR_LANDING.agc
033370,000004: ## Purpose: A section of the reconstructed source code for Luminary 130.
033371,000005: ## This was the original program released for the Apollo 13 LM,
033372,000006: ## although several more revisions would follow. It has been
033373,000007: ## reconstructed from a listing of Luminary 131, from which it
033374,000008: ## differs on only two lines in P70-P71. The difference is
033375,000009: ## described in detail in Luminary memo #129, which was used
033376,000010: ## to perform the reconstruction. This file is intended to be a
033377,000011: ## faithful reconstruction, except that the code format has been
033378,000012: ## changed to conform to the requirements of the yaYUL assembler
033379,000013: ## rather than the original YUL assembler.
033380,000014: ## Reference: pp. 780-787
033381,000015: ## Contact: Ron Burkey <info@sandroid.org>.
033382,000016: ## Website: www.ibiblio.org/apollo/index.html
033383,000017: ## Mod history: 05/25/03 RSB. Began transcribing.
033384,000018: ## 05/14/05 RSB Corrected website reference above.
033385,000019: ## 2017-01-06 RSB Page numbers now agree with those on the
033386,000020: ## original hardcopy, as opposed to the PDF page
033387,000021: ## numbers in 1701.pdf.
033388,000022: ## 2017-02-25 RSB Proofed comment text using octopus/ProoferComments.
033389,000023: ## 2017-03-01 RSB Fixed lingering typos.
033390,000024: ## 2017-03-14 RSB Comment-text fixes noted in proofing Luminary 116.
033391,000025: ## 2017-03-16 RSB Comment-text fixes identified in 5-way
033392,000026: ## side-by-side diff of Luminary 69/99/116/131/210.
033393,000027: ## 2018-09-04 MAS Copied from Luminary 131 for Luminary 130.
033394,000028:
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Page 780
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033396,000030: 32,3000 BANK 32
033397,000031: 32,2000 SETLOC F2DPS*32
033398,000032: 32,2000 BANK
033399,000033:
033400,000034: 32,3000 E7,1621 EBANK= E2DPS
033401,000035:
033402,000036: # ****************************************
033403,000037: # P63: THE LUNAR LANDING, BRAKING PHASE
033404,000038: # ****************************************
033405,000039:
033406,000040: 32,3000 COUNT* $$/P63
033407,000041:
033408,000042: 32,3000 05353 P63LM TC PHASCHNG
033409,000043: 32,3001 04024 OCT 04024
033410,000044:
033411,000045: 32,3002 04616 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
033412,000046: 32,3003 11233 CADR R02BOTH
033413,000047:
033414,000048: 32,3004 33255 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
033415,000049: 32,3005 55455 TS WHICH
033416,000050:
033417,000051: 32,3006 32000 CAF DPSTHRSH # INITIALIZE DVMON
033418,000052: 32,3007 55250 TS DVTHRUSH
033419,000053: 32,3010 34751 CAF FOUR
033420,000054: 32,3011 55515 TS DVCNTR
033421,000055:
033422,000056: 32,3012 44753 CS ONE # INITIALIZE WCHPHASE AND FLPASSO
033423,000057: 32,3013 55346 TS WCHPHASE
033424,000058:
033425,000059: 32,3014 34755 CA ZERO
033426,000060: 32,3015 55623 TS FLPASS0
033427,000061:
033428,000062: 32,3016 44736 CS BIT14
033429,000063: 32,3017 00006 EXTEND
033430,000064: 32,3020 03012 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
033431,000065:
033432,000066: 32,3021 06042 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
033433,000067: 32,3022 43014 CLEAR CLEAR
033434,000068: 32,3023 02663 NOTHROTL
033435,000069: 32,3024 03271 REDFLAG
033436,000070: 32,3025 43014 CLEAR SET
033437,000071: 32,3026 05660 LRBYPASS
033438,000072: 32,3027 03067 MUNFLAG
033439,000073: 32,3030 43014 CLEAR CLEAR
033440,000074: 32,3031 00266 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
033441,000075: 32,3032 00270 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
033442,000076:
033443,000077: # ****************************************
033444,000078:
033445,000079: 32,3033 77201 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
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Page 781
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033447,000081: 32,3034 00001 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
033448,000082: 32,3035 02023 RLS # AT 6D ESTIMATED TIME OF LANDING
033449,000083: 32,3036 41525 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
033450,000084: 32,3037 02401 TLAND
033451,000085: 32,3040 37625 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
033452,000086: 32,3041 55716 RP-TO-R
033453,000087: 32,3042 64312 VSL4 MXV
033454,000088: 32,3043 01734 REFSMMAT
033455,000089: 32,3044 37635 STCALL LAND
033456,000090: 32,3045 71343 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
033457,000091: 32,3046 45345 DLOAD DSU
033458,000092: 32,3047 02401 TLAND
033459,000093: 32,3050 25262 GUIDDURN
033460,000094: 32,3051 34041 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
033461,000095: 32,3052 27056 LEMPREC
033462,000096: 32,3053 77331 SSP VLOAD
033463,000097: 32,3054 03647 NIGNLOOP
033464,000098: 32,3055 00050 40D
033465,000099: 32,3056 06522 UNITX
033466,000100: 32,3057 26575 STOVL CG
033467,000101: 32,3060 06520 UNITY
033468,000102: 32,3061 26603 STOVL CG +6
033469,000103: 32,3062 06516 UNITZ
033470,000104: 32,3063 16611 STODL CG +14
033471,000105: 32,3064 25260 99999CON
033472,000106: 32,3065 27665 STOVL DELTAH # INITIALIZE DELTAH FOR V16N68 DISPLAY
033473,000107: 32,3066 06524 ZEROVECS
033474,000108: 32,3067 17253 STODL UNFC/2 # INITIALIZE TRIM VELOCITY CORRECTION TERM
033475,000109: 32,3070 06524 HI6ZEROS
033476,000110: 32,3071 03643 STORE TTF/8
033477,000111:
033478,000112: 32,3072 77745 IGNALOOP DLOAD
033479,000113: 32,3073 00015 TAT
033480,000114: 32,3074 27561 STOVL PIPTIME1
033481,000115: 32,3075 00017 RATT1
033482,000116: 32,3076 64312 VSL4 MXV
033483,000117: 32,3077 01734 REFSMMAT
033484,000118: 32,3100 37521 STCALL R
033485,000119: 32,3101 67067 MUNGRAV
033486,000120: 32,3102 35236 STCALL GDT/2
033487,000121: 32,3103 62415 ?GUIDSUB # WHICH DELIVERS N PASSES OF GUIDANCE
033488,000122:
033489,000123: # DDUMCALC IS PROGRAMMED AS FOLLOWS:-
033490,000124: # 2 -
033491,000125: # (RIGNZ - RGU )/16 + 16(RGU )KIGNY/B8 + (RGU - RIGNX)KIGNX/B4 + (ABVAL(VGU) - VIGN)KIGNV/B4
033492,000126: # 2 1 0
033493,000127: # DDUM = -------------------------------------------------------------------------------------------
033494,000128: # 10
033495,000129: # 2 (VGU - 16 VGU KIGNX/B4)
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Page 782
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033497,000131: # 2 0
033498,000132: # THE NUMERATOR IS SCALED IN METERS AT 2(28). THE DENOMINATOR IS A VELOCITY IN UNITS OF 2(10) M/CS.
033499,000133: # THE QUOTIENT IS THUS A TIME IN UNITS OF 2(18) CENTISECONDS. THE FINAL SHIFT RESCALES TO UNITS OF 2(28) CS.
033500,000134: # THERE IS NO DAMPING FACTOR. THE CONSTANTS KIGNX/B4, KIGNY/B8 AND KIGNV/B4 ARE ALL NEGATIVE IN SIGN.
033501,000135:
033502,000136: 32,3104 55646 DDUMCALC TS NIGNLOOP
033503,000137: 32,3105 06042 TC INTPRET
033504,000138: 32,3106 57345 DLOAD DMPR # FORM DENOMINATOR FIRST
033505,000139: 32,3107 03627 VGU
033506,000140: 32,3110 02501 KIGNX/B4
033507,000141: 32,3111 44232 SL4R BDSU
033508,000142: 32,3112 03633 VGU +4
033509,000143: 32,3113 45325 PDDL DSU
033510,000144: 32,3114 02477 RIGNZ
033511,000145: 32,3115 02633 RGU +4
033512,000146: 32,3116 65222 SR4R PDDL
033513,000147: 32,3117 02631 RGU +2
033514,000148: 32,3120 57316 DSQ DMPR
033515,000149: 32,3121 02503 KIGNY/B8
033516,000150: 32,3122 65232 SL4R PDDL
033517,000151: 32,3123 02627 RGU
033518,000152: 32,3124 57225 DSU DMPR
033519,000153: 32,3125 02475 RIGNX
033520,000154: 32,3126 02501 KIGNX/B4
033521,000155: 32,3127 51515 PDVL ABVAL
033522,000156: 32,3130 03627 VGU
033523,000157: 32,3131 57225 DSU DMPR
033524,000158: 32,3132 02473 VIGN
033525,000159: 32,3133 02505 KIGNV/B4
033526,000160: 32,3134 43215 DAD DAD
033527,000161: 32,3135 56215 DAD DDV
033528,000162: 32,3136 77661 SRR
033529,000163: 32,3137 21613 10D
033530,000164:
033531,000165: 32,3140 43206 PUSH DAD
033532,000166: 32,3141 03561 PIPTIME1
033533,000167: 32,3142 14041 STODL TDEC1 # STORE NEW GUESS FOR NEXT INTEGRATION
033534,000168: 32,3143 45246 ABS DSU
033535,000169: 32,3144 25264 DDUMCRIT
033536,000170: 32,3145 45040 BMN CALL
033537,000171: 32,3146 65165 DDUMGOOD
033538,000172: 32,3147 27410 INTSTALL
033539,000173: 32,3150 43014 SET SET
033540,000174: 32,3151 01473 INTYPFLG
033541,000175: 32,3152 00063 MOONFLAG
033542,000176: 32,3153 77745 DLOAD
033543,000177: 32,3154 03561 PIPTIME1
033544,000178: 32,3155 25517 STOVL TET # HOPEFULLY ?GUIDSUB DID NOT
033545,000179: 32,3156 00017 RATT1 # CLOBBER RATT1 AND VATT1
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Page 783
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033547,000181: 32,3157 25535 STOVL RCV
033548,000182: 32,3160 00025 VATT1
033549,000183: 32,3161 35543 STCALL VCV
033550,000184: 32,3162 27106 INTEGRVS
033551,000185: 32,3163 77650 GOTO
033552,000186: 32,3164 65072 IGNALOOP
033553,000187:
033554,000188: 32,3165 54335 DDUMGOOD SLOAD SR
033555,000189: 32,3166 03423 ZOOMTIME
033556,000190: 32,3167 20617 14D
033557,000191: 32,3170 77621 BDSU
033558,000192: 32,3171 00041 TDEC1
033559,000193: 32,3172 27442 STOVL TIG # COMPUTE DISTANCE LANDING SITE WILL BE
033560,000194: 32,3173 03527 V # OUT OF LM'S ORBITAL PLANE AT IGNITION:
033561,000195: 32,3174 53435 VXV UNIT # SIGN IS + IF LANDING SITE IS TO THE
033562,000196: 32,3175 03521 R # RIGHT, NORTH; - IF TO THE LEFT, SOUTH.
033563,000197: 32,3176 72441 DOT SL1
033564,000198: 32,3177 03635 LAND
033565,000199: 32,3200 26617 R60INIT STOVL OUTOFPLN # INITIALIZATION FOR CALCMANU
033566,000200: 32,3201 03253 UNFC/2
033567,000201: 32,3202 02621 STORE R60VSAVE # STORE UNFC/2 TEMPORARILY IN R60SAVE
033568,000202: 32,3203 77776 EXIT
033569,000203: # ****************************************
033570,000204:
033571,000205: 32,3204 05353 IGNALGRT TC PHASCHNG # PREVENT REPEATING IGNALG
033572,000206: 32,3205 04024 OCT 04024
033573,000207:
033574,000208: 32,3206 44362 ASTNCLOK CS ASTNDEX
033575,000209: 32,3207 04616 TC BANKCALL
033576,000210: 32,3210 74670 CADR STCLOK2
033577,000211: 32,3211 15155 TCF ENDOFJOB # RETURN IN NEW JOB AND IN EBANK FIVE
033578,000212:
033579,000213: 32,3212 06042 ASTNRET TC INTPRET
033580,000214: 32,3213 47131 SSP RTB # GO PICK UP DISPLAY AT END OF R51:
033581,000215: 32,3214 02747 QMAJ # "PROCEED" WILL DO A FINE ALIGNMENT
033582,000216: 32,3215 65217 FCADR P63SPOT2 # "ENTER" WILL RETURN TO P63SPOT2
033583,000217: 32,3216 31127 R51P63
033584,000218: 32,3217 53575 P63SPOT2 VLOAD UNIT # INITIALIZE KALCMANU FOR BURN ATTITUDE
033585,000219: 32,3220 02621 R60VSAVE
033586,000220: 32,3221 27773 STOVL POINTVSM
033587,000221: 32,3222 06522 UNITX
033588,000222: 32,3223 03765 STORE SCAXIS
033589,000223: 32,3224 77776 EXIT
033590,000224:
033591,000225: 32,3225 35016 CAF EBANK7
033592,000226: 32,3226 54003 TS EBANK
033593,000227:
033594,000228: 32,3227 00004 INHINT
033595,000229: 32,3230 04674 TC IBNKCALL
033596,000230: 32,3231 40143 CADR PFLITEDB
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Page 784
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033598,000232: 32,3232 00003 RELINT
033599,000233:
033600,000234: 32,3233 04616 TC BANKCALL
033601,000235: 32,3234 54123 CADR R60LEM
033602,000236:
033603,000237: 32,3235 05353 TC PHASCHNG # PREVENT RECALLING R60
033604,000238: 32,3236 04024 OCT 04024
033605,000239:
033606,000240: 32,3237 34746 P63SPOT3 CA BIT6 # IS THE LR ANTENNA IN POSITION 1 YET
033607,000241: 32,3240 00006 EXTEND
033608,000242: 32,3241 02033 RAND CHAN33
033609,000243: 32,3242 00006 EXTEND
033610,000244: 32,3243 13251 BZF P63SPOT4 # BRANCH IF ANTENNA ALREADY IN POSITION 1
033611,000245:
033612,000246: 32,3244 33256 CAF CODE500 # ASTRONAUT: PLEASE CRANK THE
033613,000247: 32,3245 04616 TC BANKCALL # SILLY THING AROUND
033614,000248: 32,3246 20624 CADR GOPERF1
033615,000249: 32,3247 16001 TCF GOTOPOOH # TERMINATE
033616,000250: 32,3250 13237 TCF P63SPOT3 # PROCEED SEE IF HE'S LYING
033617,000251:
033618,000252: 32,3251 04616 P63SPOT4 TC BANKCALL # ENTER INITIALIZE LANDING RADAR
033619,000253: 32,3252 67701 CADR SETPOS1
033620,000254:
033621,000255: 32,3253 04635 TC POSTJUMP # OFF TO SEE THE WIZARD ...
033622,000256: 32,3254 74130 CADR BURNBABY
033623,000257:
033624,000258: # ----------------------------------------
033625,000259:
033626,000260: # CONSTANTS FOR P63LM AND IGNALG
033627,000261:
033628,000262: 32,3255 02100 P63ADRES GENADR P63TABLE
033629,000263:
033630,000264: 32,3256 4362 ASTNDEX = MD1 # OCT 25; INDEX FOR CLOKTASK
033631,000265:
033632,000266: 32,3256 00500 CODE500 OCT 00500
033633,000267:
033634,000268: 32,3257 00035 30373 99999CON 2DEC 30479.7 B-24
033635,000269:
033636,000270: 32,3261 00004 01610 GUIDDURN 2DEC +66440 B-28 # GUIDDURN +6.64400314 E+2
033637,000271: 32,3263 00000 00010 DDUMCRIT 2DEC +8 B-28 # CRITERION FOR IGNALG CONVERGENCE
033638,000272:
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Page 785
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033640,000274: # ----------------------------------------
033641,000275:
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Page 786
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033643,000277: # ****************************************
033644,000278: # P68: LANDING CONFIRMATION
033645,000279: # ****************************************
033646,000280:
033647,000281: 34,3271 BANK 34
033648,000282: 34,2000 SETLOC F2DPS*34
033649,000283: 34,2000 BANK
033650,000284:
033651,000285: 34,3271 COUNT* $$/P6567
033652,000286:
033653,000287: 34,3271 05353 LANDJUNK TC PHASCHNG
033654,000288: 34,3272 04024 OCT 04024
033655,000289:
033656,000290: 34,3273 00004 INHINT
033657,000291: 34,3274 04616 TC BANKCALL # ZERO ATTITUDE ERROR
033658,000292: 34,3275 40154 CADR ZATTEROR
033659,000293:
033660,000294: 34,3276 06042 TC INTPRET # TO INTERPRETIVE AS TIME IS NOT CRITICAL
033661,000295: 34,3277 77614 SET # PREVENT RCS JET FIRINGS IF MODE CONT IS
033662,000296: 34,3300 06460 PULSEFLG # IN ATT HOLD
033663,000297: 34,3301 43014 SET CLEAR
033664,000298: 34,3302 04067 SURFFLAG
033665,000299: 34,3303 04666 LETABORT
033666,000300: 34,3304 77214 SET VLOAD
033667,000301: 34,3305 05062 APSFLAG
033668,000302: 34,3306 01220 RN
033669,000303: 34,3307 16032 STODL ALPHAV
033670,000304: 34,3310 01234 PIPTIME
033671,000305: 34,3311 45014 SET CALL
033672,000306: 34,3312 01463 LUNAFLAG
033673,000307: 34,3313 26347 LAT-LONG
033674,000308: 34,3314 77201 SETPD VLOAD # COMPUTE RLS AND STORE IT AWAY
033675,000309: 34,3315 00001 0
033676,000310: 34,3316 01220 RN
033677,000311: 34,3317 65352 VSL2 PDDL
033678,000312: 34,3320 01234 PIPTIME
033679,000313: 34,3321 45006 PUSH CALL
033680,000314: 34,3322 51700 R-TO-RP
033681,000315: 34,3323 02023 STORE RLS
033682,000316: 34,3324 77776 EXIT
033683,000317: 34,3325 33342 CAF V06N43* # ASTRONAUT: NOW LOOK WHERE YOU ENDED UP
033684,000318: 34,3326 04616 TC BANKCALL
033685,000319: 34,3327 20477 CADR GOFLASH
033686,000320: 34,3330 16001 TCF GOTOPOOH # TERMINATE
033687,000321: 34,3331 13333 TCF +2 # PROCEED
033688,000322: 34,3332 13325 TCF -5 # RECYCLE
033689,000323:
033690,000324: 34,3333 06042 TC INTPRET
033691,000325: 34,3334 77775 VLOAD # INITIALIZE GSAV AND (USING REFMF)
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Page 787
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033693,000327: 34,3335 06522 UNITX # YNBSAV, ZNBSAV AND ATTFLAG FOR P57
033694,000328: 34,3336 36231 STCALL GSAV
033695,000329: 34,3337 33471 REFMF
033696,000330: 34,3340 77776 EXIT
033697,000331:
033698,000332: 34,3341 16001 TCF GOTOPOOH # ASTRONAUT: PLEASE SELECT P57
033699,000333:
033700,000334: 34,3342 01453 V06N43* VN 0643
033701,000335:
End of include-file THE_LUNAR_LANDING.agc. Parent file is MAIN.agc