Source Code
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These source-code files are part of a reconstructed copy of Luminary 97, the
second release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software. It was created to fix two incorrect ephemeris constants in
Luminary 96, as described by anomaly report LNY-59.
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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035989,000002: ## Copyright: Public domain.
035990,000003: ## Filename: P12.agc
035991,000004: ## Purpose: A section of Luminary revision 97.
035992,000005: ## It is part of the reconstructed source code for the
035993,000006: ## second release of the flight software for the Lunar
035994,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
035995,000008: ## It was created to fix two incorrect ephemeris constants in
035996,000009: ## Luminary 96, as described by anomaly report LNY-59.
035997,000010: ## The code has been recreated from a copy of Luminary 99
035998,000011: ## revision 001, using asterisks indicating changed lines in
035999,000012: ## the listing and Luminary Memos #83 and #85, which list
036000,000013: ## changes between Luminary 97 and 98, and 98 and 99. The
036001,000014: ## code has been adapted such that the resulting bugger words
036002,000015: ## exactly match those specified for Luminary 97 in NASA drawing
036003,000016: ## 2021152D, which gives relatively high confidence that the
036004,000017: ## reconstruction is correct.
036005,000018: ## Reference: pp. 838-842
036006,000019: ## Assembler: yaYUL
036007,000020: ## Contact: Ron Burkey <info@sandroid.org>.
036008,000021: ## Website: www.ibiblio.org/apollo/index.html
036009,000022: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
036010,000023:
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Page 838
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036012,000025: 24,3670 BANK 24
036013,000026: 30,2000 SETLOC P12
036014,000027: 30,2000 BANK
036015,000028:
036016,000029: 30,2061 E7,1515 EBANK= DVCNTR
036017,000030: 30,2061 COUNT* $$/P12
036018,000031:
036019,000032: 30,2061 05353 P12LM TC PHASCHNG
036020,000033: 30,2062 04024 OCT 04024
036021,000034:
036022,000035: 30,2063 04616 TC BANKCALL
036023,000036: 30,2064 11254 CADR R02BOTH # CHECK THE STATUS OF THE IMU.
036024,000037:
036025,000038: 30,2065 05504 TC UPFLAG
036026,000039: 30,2066 00141 ADRES MUNFLAG
036027,000040:
036028,000041: 30,2067 05504 TC UPFLAG # INSURE 4-JET TRANSLATION CAPABILITY.
036029,000042: 30,2070 00307 ADRES ACC4-2FL
036030,000043:
036031,000044: 30,2071 05504 TC UPFLAG # PREVENT R10 FROM ISSUING CROSS-POINTER
036032,000045: 30,2072 00015 ADRES R10FLAG # OUTPUTS.
036033,000046:
036034,000047: 30,2073 06011 TC CLRADMOD # INITIALIZE RADMODES FOR R29.
036035,000048:
036036,000049: 30,2074 05516 TC DOWNFLAG # CLEAR RENDEZVOUS FLAG FOR P22
036037,000050: 30,2075 00010 ADRES RNDVZFLG
036038,000051:
036039,000052: 30,2076 36000 CAF THRESH2 # INITIALIZE DVMON
036040,000053: 30,2077 55251 TS DVTHRUSH
036041,000054: 30,2100 34751 CAF FOUR
036042,000055: 30,2101 55515 TS DVCNTR
036043,000056:
036044,000057: 30,2102 34755 CA ZERO
036045,000058: 30,2103 55462 TS TRKMKCNT # SHOW THAT R29 DOWNLINK DATA ISN'T READY.
036046,000059: 30,2104 33035 CAF V06N33A
036047,000060: 30,2105 04616 TC BANKCALL # FLASH TIG
036048,000061: 30,2106 20476 CADR GOFLASH
036049,000062: 30,2107 16001 TCF GOTOPOOH
036050,000063: 30,2110 12112 TCF +2 # PROCEED
036051,000064: 30,2111 12104 TCF -5 # ENTER
036052,000065:
036053,000066: 30,2112 05353 TC PHASCHNG
036054,000067: 30,2113 04024 OCT 04024
036055,000068:
036056,000069: 30,2114 06037 TC INTPRET
036057,000070: 30,2115 77624 CALL # INITIALIZE WM AND /LAND/
036058,000071: 30,2116 46432 GUIDINIT
036059,000072: 30,2117 45014 SET CALL
036060,000073: 30,2120 04464 FLPI
036061,000074: 30,2121 60254 P12INIT
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Page 839
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036063,000076: 30,2122 77745 P12LMB DLOAD
036064,000077: 30,2123 25761 (TGO)A # SET TGO TO AN INITIAL NOMINAL VALUE.
036065,000078: 30,2124 17517 STODL TGO
036066,000079: 30,2125 03442 TIG
036067,000080: 30,2126 34041 STCALL TDEC1
036068,000081: 30,2127 27057 LEMPREC # ROTATE THE STATE VECTORS TO THE
036069,000082: 30,2130 64375 VLOAD MXV # IGNITION TIME.
036070,000083: 30,2131 00007 VATT
036071,000084: 30,2132 01734 REFSMMAT
036072,000085: 30,2133 77772 VSL1
036073,000086: 30,2134 27601 STOVL V1S # COMPUTE V1S = VEL(TIG)*2(-7) M/CS.
036074,000087: 30,2135 00001 RATT
036075,000088: 30,2136 52521 MXV VSL6
036076,000089: 30,2137 01734 REFSMMAT
036077,000090: 30,2140 37521 STCALL R # COMPUTE R = POS(TIG)*2(-24) M.
036078,000091: 30,2141 67130 MUNGRAV # COMPUTE GDT1/2(TIG)*2(-7)M/CS.
036079,000092: 30,2142 53575 VLOAD UNIT
036080,000093: 30,2143 03521 R
036081,000094: 30,2144 37537 STCALL UNIT/R/ # COMPUTE UNIT/R/ FOR YCOMP.
036082,000095: 30,2145 57312 YCOMP
036083,000096: 30,2146 57461 SR DCOMP
036084,000097: 30,2147 20606 5D
036085,000098: 30,2150 17643 STODL XRANGE # INITIALIZE XRANGE FOR NOUN 76.
036086,000099: 30,2151 06456 VINJNOM
036087,000100: 30,2152 16277 STODL ZDOTD
036088,000101: 30,2153 06460 RDOTDNOM
036089,000102: 30,2154 02273 STORE RDOTD
036090,000103: 30,2155 77776 EXIT
036091,000104:
036092,000105: 30,2156 05353 TC PHASCHNG
036093,000106: 30,2157 04024 OCT 04024
036094,000107:
036095,000108: 30,2160 33034 NEWLOAD CAF V06N76 # FLASH CROSS-RANGE AND APOLUNE VALUES.
036096,000109: 30,2161 04616 TC BANKCALL
036097,000110: 30,2162 20476 CADR GOFLASH
036098,000111: 30,2163 16001 TCF GOTOPOOH
036099,000112: 30,2164 12166 TCF +2 # PROCEED
036100,000113: 30,2165 12160 TCF NEWLOAD # ENTER NEW DATA.
036101,000114:
036102,000115: 30,2166 32320 CAF P12ADRES
036103,000116: 30,2167 55455 TS WHICH
036104,000117:
036105,000118: 30,2170 05353 TC PHASCHNG
036106,000119: 30,2171 04024 OCT 04024
036107,000120:
036108,000121: 30,2172 06037 TC INTPRET
036109,000122: 30,2173 54345 DLOAD SL
036110,000123: 30,2174 03643 XRANGE
036111,000124: 30,2175 20206 5D
036112,000125: 30,2176 77615 DAD
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Page 840
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036114,000127: 30,2177 02335 Y
036115,000128: 30,2200 27633 STOVL YCO
036116,000129: 30,2201 03537 UNIT/R/
036117,000130: 30,2202 53361 VXSC VAD
036118,000131: 30,2203 06454 49FPS
036119,000132: 30,2204 03601 V1S
036120,000133: 30,2205 03527 STORE V # V(TIPOVER) = V(IGN) + 57FPS (UNIT/R/)
036121,000134: 30,2206 72441 DOT SL1
036122,000135: 30,2207 03537 UNIT/R/
036123,000136: 30,2210 27474 STOVL RDOT # RDOT * 2(-7)
036124,000137: 30,2211 03537 UNIT/R/
036125,000138: 30,2212 53435 VXV UNIT
036126,000139: 30,2213 03720 QAXIS
036127,000140: 30,2214 03726 STORE ZAXIS1
036128,000141: 30,2215 77614 SETGO
036129,000142: 30,2216 04421 FLVR
036130,000143: 30,2217 60321 ASCENT
036131,000144: 30,2220 77745 P12RET DLOAD
036132,000145: 30,2221 02361 ATP # ATP(2)*2(18)
036133,000146: 30,2222 65316 DSQ PDDL
036134,000147: 30,2223 02355 ATY # ATY(2)*2(18)
036135,000148: 30,2224 43316 DSQ DAD
036136,000149: 30,2225 75454 BZE SQRT
036137,000150: 30,2226 60232 YAWDUN
036138,000151: 30,2227 55352 SL1 BDDV
036139,000152: 30,2230 02355 ATY
036140,000153: 30,2231 77736 ARCSIN
036141,000154: 30,2232 26363 YAWDUN STOVL YAW
036142,000155: 30,2233 03254 UNFC/2
036143,000156: 30,2234 50256 UNIT DOT
036144,000157: 30,2235 03537 UNIT/R/
036145,000158: 30,2236 65552 SL1 ARCCOS
036146,000159: 30,2237 77676 DCOMP
036147,000160: 30,2240 02365 STORE PITCH
036148,000161: 30,2241 77776 EXIT
036149,000162: 30,2242 05353 TC PHASCHNG
036150,000163: 30,2243 04024 OCT 04024
036151,000164:
036152,000165: 30,2244 05516 TC DOWNFLAG
036153,000166: 30,2245 00213 ADRES FLPI
036154,000167:
036155,000168: 30,2246 00004 INHINT
036156,000169: 30,2247 04674 TC IBNKCALL
036157,000170: 30,2250 40142 CADR PFLITEDB
036158,000171: 30,2251 00003 RELINT
036159,000172:
036160,000173: 30,2252 04635 TC POSTJUMP
036161,000174: 30,2253 74126 CADR BURNBABY
036162,000175:
036163,000176: 30,2254 77745 P12INIT DLOAD # INITIALIZE ENGINE DATA. USED FOR P12 AND
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Page 841
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036165,000178: 30,2255 16013 (1/DV)A # P71.
036166,000179: 30,2256 03641 STORE 1/DV3
036167,000180: 30,2257 03637 STORE 1/DV2
036168,000181: 30,2260 17635 STODL 1/DV1
036169,000182: 30,2261 16017 (AT)A
036170,000183: 30,2262 16263 STODL AT
036171,000184: 30,2263 16021 (TBUP)A
036172,000185: 30,2264 16271 STODL TBUP
036173,000186: 30,2265 34013 ATDECAY
036174,000187: 30,2266 54276 DCOMP SL
036175,000188: 30,2267 20214 11D
036176,000189: 30,2270 02267 STORE TTO
036177,000190: 30,2271 57535 SLOAD DCOMP
036178,000191: 30,2272 26001 APSVEX
036179,000192: 30,2273 77702 SR2
036180,000193: 30,2274 02265 STORE VE
036181,000194: 30,2275 43414 BOFF RVQ
036182,000195: 30,2276 04747 FLAP
036183,000196: 30,2277 60300 COMMINIT
036184,000197: 30,2300 43345 COMMINIT DLOAD DAD # INITIALIZE TARGET DATA. USED BY P12, P70
036185,000198: 30,2301 25757 HINJECT # AND P71 IF IT DOES NOT FOLLOW P70.
036186,000199: 30,2302 02333 /LAND/
036187,000200: 30,2303 17631 STODL RCO
036188,000201: 30,2304 06522 HI6ZEROS
036189,000202: 30,2305 03654 STORE TXO
036190,000203: 30,2306 03633 STORE YCO
036191,000204: 30,2307 02273 STORE RDOTD
036192,000205: 30,2310 26275 STOVL YDOTD
036193,000206: 30,2311 01563 VRECTCSM
036194,000207: 30,2312 64235 VXV MXV
036195,000208: 30,2313 01555 RRECTCSM
036196,000209: 30,2314 01734 REFSMMAT
036197,000210: 30,2315 77656 UNIT
036198,000211: 30,2316 03720 STORE QAXIS
036199,000212: 30,2317 77616 RVQ
036200,000213: 30,2320 02022 P12ADRES REMADR P12TABLE
036201,000214:
036202,000215: 23,2000 SETLOC P12A
036203,000216: 23,2000 BANK
036204,000217: 23,2432 COUNT* $$/P12
036205,000218:
036206,000219: 23,2432 40220 GUIDINIT STQ SETPD
036207,000220: 23,2433 01164 TEMPR60
036208,000221: 23,2434 00001 0D
036209,000222: 23,2435 41575 VLOAD PUSH
036210,000223: 23,2436 06514 UNITZ
036211,000224: 23,2437 41434 RTB PUSH
036212,000225: 23,2440 21573 LOADTIME
036213,000226: 23,2441 77624 CALL
036214,000227: 23,2442 55716 RP-TO-R
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Page 842
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036216,000229: 23,2443 74321 MXV VXSC
036217,000230: 23,2444 01734 REFSMMAT
036218,000231: 23,2445 16027 MOONRATE
036219,000232: 23,2446 26325 STOVL WM
036220,000233: 23,2447 02023 RLS
036221,000234: 23,2450 52446 ABVAL SL3
036222,000235: 23,2451 36333 STCALL /LAND/
036223,000236: 23,2452 01164 TEMPR60
036224,000237:
036225,000238: 23,2453 00046 07374 49FPS 2DEC .149352 B-6 # EXPECTED RDOT AT TIPOVER
036226,000239: 23,2455 04145 15527 VINJNOM 2DEC 16.7924 B-7 # 5509.5 FPS(APO=30NM WITH RDOT=19.5FPS)
036227,000240: 23,2457 00007 23346 RDOTDNOM 2DEC .059436 B-7 # 19.5 FPS
036228,000241:
036229,000242:
End of include-file P12.agc. Parent file is MAIN.agc