Source Code
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This is an attempt to recreate Luminary 99 Rev 2, otherwise known as LUM99R2, from Luminary 99 Rev 1 and ephemeris data from Luminary 116. The differences are confined to the last 10-12 lines of the CONTROLLED CONSTANTS. Luminary 99 Rev 1 source-code was transcribed from a printout in the MIT Museum, while Luminary 116 source code was transcribed from a printout belonging to Don Eyles. AGC developer James Kernan, the "rope mother" for the Apollo 11 Lunar Module's AGC, explains as follows: "At the last minute, Dan Lickly, our chief engineer, appeared with ephemerides updates and it took two tries to get it right. The result was that we created Lum99 Revision 1 and Lum99 Revision 2." It is suspected that the former is what's in the MIT Museum, and the latter is what we are trying to recreate here. As for which revision actually flew in Apollo 11, all of the other available surviving evidence points to Rev 1 rather than to Rev 2, so we're just not sure! |
033468,000002: ## Copyright: Public domain.
033469,000003: ## Filename: THE_LUNAR_LANDING.agc
033470,000004: ## Purpose: Part of the source code for Luminary 1A build 099.
033471,000005: ## It is part of the source code for the Lunar Module's (LM)
033472,000006: ## Apollo Guidance Computer (AGC), for Apollo 11.
033473,000007: ## Assembler: yaYUL
033474,000008: ## Contact: Hartmuth Gutsche<hgutsche@xplornet.com>.
033475,000009: ## Website: www.ibiblio.org/apollo.
033476,000010: ## Pages: 785-792
033477,000011: ## Mod history: 2009-05-20 HG Transcribed from page images.
033478,000012: ## 2016-12-13 RSB GOTOP00H -> GOTOPOOH
033479,000013: ## 2016-12-16 RSB Proofed text comments with octopus/ProoferComments
033480,000014: ## and corrected the errors found.
033481,000015: ## 2017-03-03 RSB Snapshot of Luminary 99 Rev 1.
033482,000016: ## 2017-03-16 RSB Comment-text fixes identified in 5-way
033483,000017: ## side-by-side diff of Luminary 69/99/116/131/210.
033484,000018:
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Page 785 |
033486,000020: 32,2776 BANK 32
033487,000021: 32,2000 SETLOC F2DPS*32
033488,000022: 32,2000 BANK
033489,000023:
033490,000024: 32,2776 E7,1621 EBANK= E2DPS
033491,000025:
033492,000026: # ****************************************
033493,000027: # P63: THE LUNAR LANDING, BRAKING PHASE
033494,000028: # ****************************************
033495,000029:
033496,000030: 32,2776 COUNT* $$/P63
033497,000031:
033498,000032: 32,2776 05353 P63LM TC PHASCHNG
033499,000033: 32,2777 04024 OCT 04024
033500,000034:
033501,000035: 32,3000 04616 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
033502,000036: 32,3001 11254 CADR R02BOTH
033503,000037:
033504,000038: 32,3002 33253 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
033505,000039: 32,3003 55455 TS WHICH
033506,000040:
033507,000041: 32,3004 32000 CAF DPSTHRSH # INITIALIZE DVMON
033508,000042: 32,3005 55251 TS DVTHRUSH
033509,000043: 32,3006 34751 CAF FOUR
033510,000044: 32,3007 55515 TS DVCNTR
033511,000045:
033512,000046: 32,3010 44753 CS ONE # INITIALIZE WCHPHASE AND FLPASSO
033513,000047: 32,3011 55351 TS WCHPHASE
033514,000048:
033515,000049: 32,3012 34755 CA ZERO
033516,000050: 32,3013 55623 TS FLPASS0
033517,000051:
033518,000052: 32,3014 44736 CS BIT14
033519,000053: 32,3015 00006 EXTEND
033520,000054: 32,3016 03012 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
033521,000055:
033522,000056: 32,3017 06037 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
033523,000057: 32,3020 43014 CLEAR CLEAR
033524,000058: 32,3021 02663 NOTHROTL
033525,000059: 32,3022 03271 REDFLAG
033526,000060: 32,3023 43014 CLEAR SET
033527,000061: 32,3024 05660 LRBYPASS
033528,000062: 32,3025 03067 MUNFLAG
033529,000063: 32,3026 43014 CLEAR CLEAR
033530,000064: 32,3027 00266 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
033531,000065: 32,3030 00270 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
033532,000066:
033533,000067: # ****************************************
033534,000068:
033535,000069: 32,3031 77201 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
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Page 786 |
033537,000071: 32,3032 00001 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
033538,000072: 32,3033 02023 RLS # AT 6D ESTIMATED TIME OF LANDING
033539,000073: 32,3034 41525 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
033540,000074: 32,3035 02401 TLAND
033541,000075: 32,3036 37625 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
033542,000076: 32,3037 55716 RP-TO-R
033543,000077: 32,3040 64312 VSL4 MXV
033544,000078: 32,3041 01734 REFSMMAT
033545,000079: 32,3042 37635 STCALL LAND
033546,000080: 32,3043 46432 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
033547,000081: 32,3044 45345 DLOAD DSU
033548,000082: 32,3045 02401 TLAND
033549,000083: 32,3046 25260 GUIDDURN
033550,000084: 32,3047 34041 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
033551,000085: 32,3050 27057 LEMPREC
033552,000086: 32,3051 77331 SSP VLOAD
033553,000087: 32,3052 03647 NIGNLOOP
033554,000088: 32,3053 00050 40D
033555,000089: 32,3054 06520 UNITX
033556,000090: 32,3055 26603 STOVL CG
033557,000091: 32,3056 06516 UNITY
033558,000092: 32,3057 26611 STOVL CG +6
033559,000093: 32,3060 06514 UNITZ
033560,000094: 32,3061 16617 STODL CG +14
033561,000095: 32,3062 25256 99999CON
033562,000096: 32,3063 27665 STOVL DELTAH # INITIALIZE DELTAH FOR V16N68 DISPLAY
033563,000097: 32,3064 06522 ZEROVECS
033564,000098: 32,3065 17254 STODL UNFC/2 # INITIALIZE TRIM VELOCITY CORRECTION TERM
033565,000099: 32,3066 06522 HI6ZEROS
033566,000100: 32,3067 03643 STORE TTF/8
033567,000101:
033568,000102: 32,3070 77745 IGNALOOP DLOAD
033569,000103: 32,3071 00015 TAT
033570,000104: 32,3072 27561 STOVL PIPTIME1
033571,000105: 32,3073 00017 RATT1
033572,000106: 32,3074 64312 VSL4 MXV
033573,000107: 32,3075 01734 REFSMMAT
033574,000108: 32,3076 37521 STCALL R
033575,000109: 32,3077 67130 MUNGRAV
033576,000110: 32,3100 35237 STCALL GDT/2
033577,000111: 32,3101 62454 ?GUIDSUB # WHICH DELIVERS N PASSES OF GUIDANCE
033578,000112:
033579,000113: # DDUMCALC IS PROGRAMMED AS FOLLOWS:-
033580,000114: # 2 -
033581,000115: # (RIGNZ - RGU )/16 + 16(RGU )KIGNY/B8 + (RGU - RIGNX)KIGNX/B4 + (ABVAL(VGU) - VIGN)KIGNV/B4
033582,000116: # 2 1 0
033583,000117: # DDUM = -------------------------------------------------------------------------------------------
033584,000118: # 10
033585,000119: # 2 (VGU - 16 VGU KIGNX/B4)
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Page 787 |
033587,000121: # 2 0
033588,000122: # THE NUMERATOR IS SCALED IN METERS AT 2(28). THE DENOMINATOR IS A VELOCITY IN UNITS OF 2(10) M/CS.
033589,000123: # THE QUOTIENT IS THUS A TIME IN UNITS OF 2(18) CENTISECONDS. THE FINAL SHIFT RESCALES TO UNITS OF 2(28) CS.
033590,000124: # THERE IS NO DAMPING FACTOR. THE CONSTANTS KIGNX/B4, KIGNY/B8 AND KIGNV/B4 ARE ALL NEGATIVE IN SIGN.
033591,000125:
033592,000126: 32,3102 55646 DDUMCALC TS NIGNLOOP
033593,000127: 32,3103 06037 TC INTPRET
033594,000128: 32,3104 57345 DLOAD DMPR # FORM DENOMINATOR FIRST
033595,000129: 32,3105 03627 VGU
033596,000130: 32,3106 02501 KIGNX/B4
033597,000131: 32,3107 44232 SL4R BDSU
033598,000132: 32,3110 03633 VGU +4
033599,000133: 32,3111 45325 PDDL DSU
033600,000134: 32,3112 02477 RIGNZ
033601,000135: 32,3113 02643 RGU +4
033602,000136: 32,3114 65222 SR4R PDDL
033603,000137: 32,3115 02641 RGU +2
033604,000138: 32,3116 57316 DSQ DMPR
033605,000139: 32,3117 02503 KIGNY/B8
033606,000140: 32,3120 65232 SL4R PDDL
033607,000141: 32,3121 02637 RGU
033608,000142: 32,3122 57225 DSU DMPR
033609,000143: 32,3123 02475 RIGNX
033610,000144: 32,3124 02501 KIGNX/B4
033611,000145: 32,3125 51515 PDVL ABVAL
033612,000146: 32,3126 03627 VGU
033613,000147: 32,3127 57225 DSU DMPR
033614,000148: 32,3130 02473 VIGN
033615,000149: 32,3131 02505 KIGNV/B4
033616,000150: 32,3132 43215 DAD DAD
033617,000151: 32,3133 56215 DAD DDV
033618,000152: 32,3134 77661 SRR
033619,000153: 32,3135 21613 10D
033620,000154:
033621,000155: 32,3136 43206 PUSH DAD
033622,000156: 32,3137 03561 PIPTIME1
033623,000157: 32,3140 14041 STODL TDEC1 # STORE NEW GUESS FOR NEXT INTEGRATION
033624,000158: 32,3141 45246 ABS DSU
033625,000159: 32,3142 25262 DDUMCRIT
033626,000160: 32,3143 45040 BMN CALL
033627,000161: 32,3144 65163 DDUMGOOD
033628,000162: 32,3145 27414 INTSTALL
033629,000163: 32,3146 43014 SET SET
033630,000164: 32,3147 01473 INTYPFLG
033631,000165: 32,3150 00063 MOONFLAG
033632,000166: 32,3151 77745 DLOAD
033633,000167: 32,3152 03561 PIPTIME1
033634,000168: 32,3153 25517 STOVL TET # HOPEFULLY ?GUIDSUB DID NOT
033635,000169: 32,3154 00017 RATT1 # CLOBBER RATT1 AND VATT1
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Page 788 |
033637,000171: 32,3155 25535 STOVL RCV
033638,000172: 32,3156 00025 VATT1
033639,000173: 32,3157 35543 STCALL VCV
033640,000174: 32,3160 27107 INTEGRVS
033641,000175: 32,3161 77650 GOTO
033642,000176: 32,3162 65070 IGNALOOP
033643,000177:
033644,000178: 32,3163 54335 DDUMGOOD SLOAD SR
033645,000179: 32,3164 03423 ZOOMTIME
033646,000180: 32,3165 20617 14D
033647,000181: 32,3166 77621 BDSU
033648,000182: 32,3167 00041 TDEC1
033649,000183: 32,3170 27442 STOVL TIG # COMPUTE DISTANCE LANDING SITE WILL BE
033650,000184: 32,3171 03527 V # OUT OF LM'S ORBITAL PLANE AT IGNITION:
033651,000185: 32,3172 53435 VXV UNIT # SIGN IS + IF LANDING SITE IS TO THE
033652,000186: 32,3173 03521 R # RIGHT, NORTH; - IF TO THE LEFT, SOUTH.
033653,000187: 32,3174 72441 DOT SL1
033654,000188: 32,3175 03635 LAND
033655,000189: 32,3176 26627 R60INIT STOVL OUTOFPLN # INITIALIZATION FOR CALCMANU
033656,000190: 32,3177 03254 UNFC/2
033657,000191: 32,3200 02631 STORE R60VSAVE # STORE UNFC/2 TEMPORARILY IN R60SAVE
033658,000192: 32,3201 77776 EXIT
033659,000193: # ****************************************
033660,000194:
033661,000195: 32,3202 05353 IGNALGRT TC PHASCHNG # PREVENT REPEATING IGNALG
033662,000196: 32,3203 04024 OCT 04024
033663,000197:
033664,000198: 32,3204 44362 ASTNCLOK CS ASTNDEX
033665,000199: 32,3205 04616 TC BANKCALL
033666,000200: 32,3206 74664 CADR STCLOK2
033667,000201: 32,3207 15155 TCF ENDOFJOB # RETURN IN NEW JOB AND IN EBANK FIVE
033668,000202:
033669,000203: 32,3210 06037 ASTNRET TC INTPRET
033670,000204: 32,3211 47131 SSP RTB # GO PICK UP DISPLAY AT END OF R51:
033671,000205: 32,3212 02747 QMAJ # "PROCEED" WILL DO A FINE ALIGNMENT
033672,000206: 32,3213 65215 FCADR P63SPOT2 # "ENTER" WILL RETURN TO P63SPOT2
033673,000207: 32,3214 31135 R51P63
033674,000208: 32,3215 53575 P63SPOT2 VLOAD UNIT # INITIALIZE KALCMANU FOR BURN ATTITUDE
033675,000209: 32,3216 02631 R60VSAVE
033676,000210: 32,3217 27773 STOVL POINTVSM
033677,000211: 32,3220 06520 UNITX
033678,000212: 32,3221 03765 STORE SCAXIS
033679,000213: 32,3222 77776 EXIT
033680,000214:
033681,000215: 32,3223 35016 CAF EBANK7
033682,000216: 32,3224 54003 TS EBANK
033683,000217:
033684,000218: 32,3225 00004 INHINT
033685,000219: 32,3226 04674 TC IBNKCALL
033686,000220: 32,3227 40142 CADR PFLITEDB
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Page 789 |
033688,000222: 32,3230 00003 RELINT
033689,000223:
033690,000224: 32,3231 04616 TC BANKCALL
033691,000225: 32,3232 54123 CADR R60LEM
033692,000226:
033693,000227: 32,3233 05353 TC PHASCHNG # PREVENT RECALLING R60
033694,000228: 32,3234 04024 OCT 04024
033695,000229:
033696,000230: 32,3235 34746 P63SPOT3 CA BIT6 # IS THE LR ANTENNA IN POSITION 1 YET
033697,000231: 32,3236 00006 EXTEND
033698,000232: 32,3237 02033 RAND CHAN33
033699,000233: 32,3240 00006 EXTEND
033700,000234: 32,3241 13247 BZF P63SPOT4 # BRANCH IF ANTENNA ALREADY IN POSITION 1
033701,000235:
033702,000236: 32,3242 33254 CAF CODE500 # ASTRONAUT: PLEASE CRANK THE
033703,000237: 32,3243 04616 TC BANKCALL # SILLY THING AROUND
033704,000238: 32,3244 20623 CADR GOPERF1
033705,000239: 32,3245 16001 TCF GOTOPOOH # TERMINATE
033706,000240: 32,3246 13235 TCF P63SPOT3 # PROCEED SEE IF HE'S LYING
033707,000241:
033708,000242: 32,3247 04616 P63SPOT4 TC BANKCALL # ENTER INITIALIZE LANDING RADAR
033709,000243: 32,3250 67721 CADR SETPOS1
033710,000244:
033711,000245: 32,3251 04635 TC POSTJUMP # OFF TO SEE THE WIZARD ...
033712,000246: 32,3252 74126 CADR BURNBABY
033713,000247:
033714,000248: # ----------------------------------------
033715,000249:
033716,000250: # CONSTANTS FOR P63LM AND IGNALG
033717,000251:
033718,000252: 32,3253 02076 P63ADRES GENADR P63TABLE
033719,000253:
033720,000254: 32,3254 4362 ASTNDEX = MD1 # OCT 25; INDEX FOR CLOKTASK
033721,000255:
033722,000256: 32,3254 00500 CODE500 OCT 00500
033723,000257:
033724,000258: 32,3255 00035 30373 99999CON 2DEC 30479.7 B-24
033725,000259:
033726,000260: 32,3257 00004 01610 GUIDDURN 2DEC +66440 B-28 # GUIDDURN +6.64400314 E+2
033727,000261: 32,3261 00000 00010 DDUMCRIT 2DEC +8 B-28 # CRITERION FOR IGNALG CONVERGENCE
033728,000262:
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Page 790 |
033730,000264: # ----------------------------------------
033731,000265:
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Page 791 |
033733,000267: # ****************************************
033734,000268: # P68: LANDING CONFIRMATION
033735,000269: # ****************************************
033736,000270:
033737,000271: 31,2144 BANK 31
033738,000272: 31,2000 SETLOC F2DPS*31
033739,000273: 31,2000 BANK
033740,000274:
033741,000275: 31,2144 COUNT* $$/P6567
033742,000276:
033743,000277: 31,2144 05353 LANDJUNK TC PHASCHNG
033744,000278: 31,2145 04024 OCT 04024
033745,000279:
033746,000280: 31,2146 00004 INHINT
033747,000281: 31,2147 04616 TC BANKCALL # ZERO ATTITUDE ERROR
033748,000282: 31,2150 40153 CADR ZATTEROR
033749,000283:
033750,000284: 31,2151 04616 TC BANKCALL # SET 5 DEGREE DEADBAND
033751,000285: 31,2152 40127 CADR SETMAXDB
033752,000286:
033753,000287: 31,2153 06037 TC INTPRET # TO INTERPRETIVE AS TIME IS NOT CRITICAL
033754,000288: 31,2154 43014 SET CLEAR
033755,000289: 31,2155 04067 SURFFLAG
033756,000290: 31,2156 04666 LETABORT
033757,000291: 31,2157 77214 SET VLOAD
033758,000292: 31,2160 05062 APSFLAG
033759,000293: 31,2161 01221 RN
033760,000294: 31,2162 16032 STODL ALPHAV
033761,000295: 31,2163 01235 PIPTIME
033762,000296: 31,2164 45014 SET CALL
033763,000297: 31,2165 01463 LUNAFLAG
033764,000298: 31,2166 26351 LAT-LONG
033765,000299: 31,2167 77201 SETPD VLOAD # COMPUTE RLS AND STORE IT AWAY
033766,000300: 31,2170 00001 0
033767,000301: 31,2171 01221 RN
033768,000302: 31,2172 65352 VSL2 PDDL
033769,000303: 31,2173 01235 PIPTIME
033770,000304: 31,2174 45006 PUSH CALL
033771,000305: 31,2175 51670 R-TO-RP
033772,000306: 31,2176 02023 STORE RLS
033773,000307: 31,2177 77776 EXIT
033774,000308: 31,2200 32215 CAF V06N43* # ASTRONAUT: NOW LOOK WHERE YOU ENDED UP
033775,000309: 31,2201 04616 TC BANKCALL
033776,000310: 31,2202 20476 CADR GOFLASH
033777,000311: 31,2203 16001 TCF GOTOPOOH # TERMINATE
033778,000312: 31,2204 12206 TCF +2 # PROCEED
033779,000313: 31,2205 12200 TCF -5 # RECYCLE
033780,000314:
033781,000315: 31,2206 06037 TC INTPRET
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Page 792 |
033783,000317: 31,2207 77775 VLOAD # INITIALIZE GSAV AND (USING REFMF)
033784,000318: 31,2210 06520 UNITX # YNBSAV, ZNBSAV AND ATTFLAG FOR P57
033785,000319: 31,2211 36231 STCALL GSAV
033786,000320: 31,2212 33506 REFMF
033787,000321: 31,2213 77776 EXIT
033788,000322:
033789,000323: 31,2214 16001 TCF GOTOPOOH # ASTRONAUT: PLEASE SELECT P57
033790,000324:
033791,000325: 31,2215 01453 V06N43* VN 0643
033792,000326:
End of include-file THE_LUNAR_LANDING.agc. Parent file is MAIN.agc