Source Code
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These source-code files are part of a reconstructed copy of Luminary 173, the
second (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with reconstructed source code for Luminary 178. Changes
between revision 173 and 178 were backed out, as described by Luminary memo 167
(revision 1). The reconstruction was verified by matching memory-bank checksums
to those listed in drawing 2021152N. Note that page numbers in the reconstructed
code match those for the baseline log section mentioned in each file's changelog;
the page numbers for a real Luminary 173 listing would be different.
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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036209,000002: ## Copyright: Public domain.
036210,000003: ## Filename: P12.agc
036211,000004: ## Purpose: A section of Luminary revision 173.
036212,000005: ## It is part of the reconstructed source code for the second
036213,000006: ## (unflown) release of the flight software for the Lunar
036214,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
036215,000008: ## The code has been recreated from a reconstructed copy of
036216,000009: ## Luminary 178, as well as Luminary memo 167 (revision 1).
036217,000010: ## It has been adapted such that the resulting bugger words
036218,000011: ## exactly match those specified for Luminary 173 in NASA
036219,000012: ## drawing 2021152N, which gives relatively high confidence
036220,000013: ## that the reconstruction is correct.
036221,000014: ## Reference: pp. 829-833
036222,000015: ## Assembler: yaYUL
036223,000016: ## Contact: Ron Burkey <info@sandroid.org>.
036224,000017: ## Website: www.ibiblio.org/apollo/index.html
036225,000018: ## Mod history: 2019-09-18 MAS Created from Luminary 178.
036226,000019: ## 2019-09-21 MAS Added back initialization of ZAXIS1.
036227,000020:
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Page 829
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036229,000022: 24,3642 BANK 24
036230,000023: 30,2000 SETLOC P12
036231,000024: 30,2000 BANK
036232,000025:
036233,000026: 30,2061 E7,1515 EBANK= DVCNTR
036234,000027: 30,2061 COUNT* $$/P12
036235,000028:
036236,000029: 30,2061 05364 P12LM TC PHASCHNG
036237,000030: 30,2062 04024 OCT 04024
036238,000031:
036239,000032: 30,2063 04616 TC BANKCALL
036240,000033: 30,2064 11241 CADR R02BOTH # CHECK THE STATUS OF THE IMU.
036241,000034:
036242,000035: 30,2065 36000 CAF THRESH2 # INITIALIZE DVMON
036243,000036: 30,2066 55250 TS DVTHRUSH
036244,000037: 30,2067 34751 CAF FOUR
036245,000038: 30,2070 55515 TS DVCNTR
036246,000039:
036247,000040: 30,2071 33014 CAF V06N33A
036248,000041: 30,2072 04616 TC BANKCALL # FLASH TIG
036249,000042: 30,2073 20477 CADR GOFLASH
036250,000043: 30,2074 16001 TCF GOTOPOOH
036251,000044: 30,2075 12077 TCF +2 # PROCEED
036252,000045: 30,2076 12071 TCF -5 # ENTER
036253,000046:
036254,000047: 30,2077 05364 TC PHASCHNG
036255,000048: 30,2100 04024 OCT 04024
036256,000049:
036257,000050: 30,2101 06042 TC INTPRET
036258,000051: 30,2102 43014 SET SET
036259,000052: 30,2103 03067 MUNFLAG
036260,000053: 30,2104 06464 ACC4-2FL
036261,000054: 30,2105 43014 SET CLEAR
036262,000055: 30,2106 00075 R10FLAG
036263,000056: 30,2107 00270 RNDVZFLG
036264,000057: 30,2110 43014 SET SET
036265,000058: 30,2111 04464 FLPI
036266,000059: 30,2112 04461 FLVR
036267,000060: 30,2113 77624 CALL
036268,000061: 30,2114 71346 GUIDINIT
036269,000062: 30,2115 77624 CALL
036270,000063: 30,2116 60246 P12INIT
036271,000064: 30,2117 77745 P12LMB DLOAD
036272,000065: 30,2120 25641 (TGO)A # SET TGO TO AN INITIAL NOMINAL VALUE.
036273,000066: 30,2121 17517 STODL TGO
036274,000067: 30,2122 03442 TIG
036275,000068: 30,2123 34041 STCALL TDEC1
036276,000069: 30,2124 27056 LEMPREC # ROTATE THE STATE VECTORS TO THE
036277,000070: 30,2125 64375 VLOAD MXV # IGNITION TIME.
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Page 830
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036279,000072: 30,2126 00007 VATT
036280,000073: 30,2127 01732 REFSMMAT
036281,000074: 30,2130 77772 VSL1
036282,000075: 30,2131 27601 STOVL V1S # COMPUTE V1S = VEL(TIG)*2(-7)M/CS.
036283,000076: 30,2132 00001 RATT
036284,000077: 30,2133 52521 MXV VSL6
036285,000078: 30,2134 01732 REFSMMAT
036286,000079: 30,2135 37521 STCALL R # COMPUTE R = POS(TIG)*2(-24) M.
036287,000080: 30,2136 67000 MUNGRAV # COMPUTE GDT1/2(TIG)*2(-7)M/CS.
036288,000081: 30,2137 53575 VLOAD UNIT
036289,000082: 30,2140 03521 R
036290,000083: 30,2141 37537 STCALL UNIT/R/ # COMPUTE UNIT/R/ FOR YCOMP.
036291,000084: 30,2142 57311 YCOMP
036292,000085: 30,2143 57461 SR DCOMP
036293,000086: 30,2144 20606 5D
036294,000087: 30,2145 17643 STODL XRANGE # INITIALIZE XRANGE FOR NOUN 76.
036295,000088: 30,2146 31372 VINJNOM
036296,000089: 30,2147 16277 STODL ZDOTD
036297,000090: 30,2150 31374 RDOTDNOM
036298,000091: 30,2151 02273 STORE RDOTD
036299,000092: 30,2152 77776 EXIT
036300,000093:
036301,000094: 30,2153 05364 TC PHASCHNG
036302,000095: 30,2154 04024 OCT 04024
036303,000096:
036304,000097: 30,2155 33013 NEWLOAD CAF V06N76 # FLASH CROSS-RANGE AND APOLUNE VALUES.
036305,000098: 30,2156 04616 TC BANKCALL
036306,000099: 30,2157 20477 CADR GOFLASH
036307,000100: 30,2160 16001 TCF GOTOPOOH
036308,000101: 30,2161 12163 TCF +2 # PROCEED
036309,000102: 30,2162 12155 TCF NEWLOAD # ENTER NEW DATA.
036310,000103:
036311,000104: 30,2163 32311 CAF P12ADRES
036312,000105: 30,2164 55455 TS WHICH
036313,000106:
036314,000107: 30,2165 05364 TC PHASCHNG
036315,000108: 30,2166 04024 OCT 04024
036316,000109:
036317,000110: 30,2167 06042 TC INTPRET
036318,000111: 30,2170 54345 DLOAD SL
036319,000112: 30,2171 03643 XRANGE
036320,000113: 30,2172 20206 5D
036321,000114: 30,2173 77615 DAD
036322,000115: 30,2174 02335 Y
036323,000116: 30,2175 27633 STOVL YCO
036324,000117: 30,2176 03537 UNIT/R/
036325,000118: 30,2177 53361 VXSC VAD
036326,000119: 30,2200 31370 49FPS
036327,000120: 30,2201 03601 V1S
036328,000121: 30,2202 03527 STORE V # V(TIPOVER) = V(IGN) + 57FPS (UNIT/R/)
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Page 831
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036330,000123: 30,2203 72441 DOT SL1
036331,000124: 30,2204 03537 UNIT/R/
036332,000125: 30,2205 27474 STOVL RDOT # RDOT * 2(-7)
036333,000126: 30,2206 03537 UNIT/R/
036334,000127: 30,2207 53435 VXV UNIT
036335,000128: 30,2210 03720 QAXIS
036336,000129: 30,2211 37726 STCALL ZAXIS1
036337,000130: 30,2212 60312 ASCENT
036338,000131: 30,2213 77745 P12RET DLOAD
036339,000132: 30,2214 02361 ATP # ATP(2)*2(18)
036340,000133: 30,2215 65316 DSQ PDDL
036341,000134: 30,2216 02355 ATY # ATY(2)*2(18)
036342,000135: 30,2217 43316 DSQ DAD
036343,000136: 30,2220 75454 BZE SQRT
036344,000137: 30,2221 60225 YAWDUN
036345,000138: 30,2222 55352 SL1 BDDV
036346,000139: 30,2223 02355 ATY
036347,000140: 30,2224 77736 ARCSIN
036348,000141: 30,2225 26363 YAWDUN STOVL YAW
036349,000142: 30,2226 03253 UNFC/2
036350,000143: 30,2227 50256 UNIT DOT
036351,000144: 30,2230 03537 UNIT/R/
036352,000145: 30,2231 65552 SL1 ARCCOS
036353,000146: 30,2232 77676 DCOMP
036354,000147: 30,2233 02365 STORE PITCH
036355,000148: 30,2234 77776 EXIT
036356,000149: 30,2235 05364 TC PHASCHNG
036357,000150: 30,2236 04024 OCT 04024
036358,000151:
036359,000152: 30,2237 00004 INHINT
036360,000153: 30,2240 04674 TC IBNKCALL
036361,000154: 30,2241 40143 CADR PFLITEDB
036362,000155: 30,2242 05527 TC DOWNFLAG
036363,000156: 30,2243 00213 ADRES FLPI
036364,000157:
036365,000158: 30,2244 04635 TC POSTJUMP
036366,000159: 30,2245 74130 CADR BURNBABY
036367,000160:
036368,000161: 30,2246 77745 P12INIT DLOAD # INITIALIZE ENGINE DATA. USED FOR P12 AND
036369,000162: 30,2247 16013 (1/DV)A # P71.
036370,000163: 30,2250 03641 STORE 1/DV3
036371,000164: 30,2251 03637 STORE 1/DV2
036372,000165: 30,2252 17635 STODL 1/DV1
036373,000166: 30,2253 16017 (AT)A
036374,000167: 30,2254 16263 STODL AT
036375,000168: 30,2255 16021 (TBUP)A
036376,000169: 30,2256 16271 STODL TBUP
036377,000170: 30,2257 34013 ATDECAY
036378,000171: 30,2260 54276 DCOMP SL
036379,000172: 30,2261 20214 11D
036380,000173: 30,2262 02267 STORE TTO
036381,000174: 30,2263 57535 SLOAD DCOMP
036382,000175: 30,2264 26001 APSVEX
036383,000176: 30,2265 77702 SR2
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Page 832
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036385,000178: 30,2266 02265 STORE VE
036386,000179: 30,2267 43414 BOFF RVQ
036387,000180: 30,2270 04747 FLAP
036388,000181: 30,2271 60272 COMMINIT
036389,000182: 30,2272 43345 COMMINIT DLOAD DAD # INITIALIZE TARGET DATA. USED BY P12, P70
036390,000183: 30,2273 25637 HINJECT # AND P71 IF IT DOES NOT FOLLOW P70.
036391,000184: 30,2274 02333 /LAND/
036392,000185: 30,2275 17631 STODL RCO
036393,000186: 30,2276 06520 HI6ZEROS
036394,000187: 30,2277 03654 STORE TXO
036395,000188: 30,2300 03633 STORE YCO
036396,000189: 30,2301 26275 STOVL YDOTD
036397,000190: 30,2302 01563 VRECTCSM
036398,000191: 30,2303 64235 VXV MXV
036399,000192: 30,2304 01555 RRECTCSM
036400,000193: 30,2305 01732 REFSMMAT
036401,000194: 30,2306 77656 UNIT
036402,000195: 30,2307 03720 STORE QAXIS
036403,000196: 30,2310 77616 RVQ
036404,000197:
036405,000198: 30,2311 02024 P12ADRES REMADR P12TABLE
036406,000199:
036407,000200: 34,2000 SETLOC ASENT8
036408,000201: 34,2000 BANK
036409,000202: 34,3346 COUNT* $$/P12
036410,000203:
036411,000204: 34,3346 40220 GUIDINIT STQ SETPD
036412,000205: 34,3347 01163 TEMPR60
036413,000206: 34,3350 00001 0D
036414,000207: 34,3351 41575 VLOAD PUSH
036415,000208: 34,3352 06512 UNITZ
036416,000209: 34,3353 41434 RTB PUSH
036417,000210: 34,3354 21574 LOADTIME
036418,000211: 34,3355 77624 CALL
036419,000212: 34,3356 55720 RP-TO-R
036420,000213: 34,3357 74321 MXV VXSC
036421,000214: 34,3360 01732 REFSMMAT
036422,000215: 34,3361 16027 MOONRATE
036423,000216: 34,3362 26325 STOVL WM
036424,000217: 34,3363 02021 RLS
036425,000218: 34,3364 52446 ABVAL SL3
036426,000219: 34,3365 36333 STCALL /LAND/
036427,000220: 34,3366 01163 TEMPR60
036428,000221:
036429,000222: 34,3367 00046 07374 49FPS 2DEC .149352 B-6 # EXPECTED RDOT AT TIPOVER
036430,000223:
036431,000224: 34,3371 04145 15527 VINJNOM 2DEC 16.7924 B-7 # 5509.5 FPS(APO=30NM WITH RDOT=19.5FPS)
036432,000225:
036433,000226: 34,3373 00007 23346 RDOTDNOM 2DEC .059436 B-7 # 19.5 FPS
036434,000227:
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Page 833
This page is empty in the hardcopy of the original assembly listing.
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End of include-file P12.agc. Parent file is MAIN.agc