Source Code
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This is a reconstruction of the AGC program Luminary 99 Rev 0. It was the third release
of the Lunar Module flight software targeted for use in Apollo 11, after Luminary 96 and 97.
A bug (which had been around since at least Apollo 10, Luminary 69) was
discovered in Rev 0 shortly before the Apollo 11 flight, resulting in a last minute
revision into Rev 1,
which is what actually flew rather than
the Rev 0 presented here. A hardcopy of Rev 0 is known to
exist — it belonged to AGC developer Allan Klumpp for many years — but
unfortunately the Virtual AGC Project has not had access to that hardcopy. Thus
the code you see here had been reconstructed (we believe accurately) rather than
transcribed. The first step of the reconstruction of the Rev 0 source code was
the transcription of the Rev 1 source code from a hardcopy in the MIT Museum collection.
The process of reverting the active portion of the source code (i.e., other than
program comments) from Rev 1 to Rev 0 was very minor, consisting
only of moving the position of the STARTSB1 label in
FRESH START AND RESTART. Allan had previously given
us the checksums of the memory banks of Rev 0, and we have verified the program presented here has checksums
identical to all banks of Allan's listing of Rev 0. The notations on Allan's Rev 0 program listing read,
in part:GAP: ASSEMBLE REVISION 099 OF AGC PROGRAM LUMINARY BY NASA 2021112-051 A single program comment is known to differ between Rev 0 and Rev 1, but these are harder to reconstruct and verify than changes to the active portion of the code. Thus it is possible that there are additional differences between the program comments in Rev 0 and Rev 1 that are unknown to us, and therefore are not reflected in the code presented here. |
037273,000002: ## Copyright: Public domain.
037274,000003: ## Filename: P12.agc
037275,000004: ## Purpose: Part of the reconstructed source code for LMY99 Rev 0,
037276,000005: ## otherwise known as Luminary Rev 99, the third release
037277,000006: ## of the Apollo Guidance Computer (AGC) software for Apollo 11.
037278,000007: ## It differs from LMY99 Rev 1 (the flown version) only in the
037279,000008: ## placement of a single label. The corrections shown here have
037280,000009: ## been verified to have the same bank checksums as AGC developer
037281,000010: ## Allan Klumpp's copy of Luminary Rev 99, and so are believed
037282,000011: ## to be accurate. This file is intended to be a faithful
037283,000012: ## recreation, except that the code format has been changed to
037284,000013: ## conform to the requirements of the yaYUL assembler rather than
037285,000014: ## the original YUL assembler.
037286,000015: ##
037287,000016: ## Assembler: yaYUL
037288,000017: ## Contact: Hartmuth Gutsche <hgutsche@xplornet.com>.
037289,000018: ## Website: www.ibiblio.org/apollo.
037290,000019: ## Pages: 838-842
037291,000020: ## Mod history: 2009-05-23 HG Transcribed from page images.
037292,000021: ## 2016-12-13 RSB GOTOP00H -> GOTOPOOH
037293,000022: ## 2016-12-17 RSB Proofed text comments with octopus/ProoferComments
037294,000023: ## and corrected the errors found.
037295,000024: ## 2017-01-28 RSB Back-ported a comment fix from Luminary 69.
037296,000025: ## 2017-08-01 MAS Created from LMY99 Rev 1.
037297,000026: ## 2017-08-26 MAS Fixed a comment-text error found while transcribing
037298,000027: ## Zerlina 56.
037299,000028:
037300,000029: ## This source code has been transcribed or otherwise adapted from
037301,000030: ## digitized images of a hardcopy from the MIT Museum. The digitization
037302,000031: ## was performed by Paul Fjeld, and arranged for by Deborah Douglas of
037303,000032: ## the Museum. Many thanks to both. The images (with suitable reduction
037304,000033: ## in storage size and consequent reduction in image quality as well) are
037305,000034: ## available online at www.ibiblio.org/apollo. If for some reason you
037306,000035: ## find that the images are illegible, contact me at info@sandroid.org
037307,000036: ## about getting access to the (much) higher-quality images which Paul
037308,000037: ## actually created.
037309,000038: ##
037310,000039: ## The code has been modified to match LMY99 Revision 0, otherwise
037311,000040: ## known as Luminary Revision 99, the Apollo 11 software release preceeding
037312,000041: ## the listing from which it was transcribed. It has been verified to
037313,000042: ## contain the same bank checksums as AGC developer Allan Klumpp's listing
037314,000043: ## of Luminary Revision 99 (for which we do not have scans).
037315,000044: ##
037316,000045: ## Notations on Allan Klumpp's listing read, in part:
037317,000046: ##
037318,000047: ## ASSEMBLE REVISION 099 OF AGC PROGRAM LUMINARY BY NASA 2021112-51
037319,000048:
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Page 838 |
037321,000050: 24,3670 BANK 24
037322,000051: 30,2000 SETLOC P12
037323,000052: 30,2000 BANK
037324,000053:
037325,000054: 30,2061 E7,1515 EBANK= DVCNTR
037326,000055: 30,2061 COUNT* $$/P12
037327,000056:
037328,000057: 30,2061 05353 P12LM TC PHASCHNG
037329,000058: 30,2062 04024 OCT 04024
037330,000059:
037331,000060: 30,2063 04616 TC BANKCALL
037332,000061: 30,2064 11254 CADR R02BOTH # CHECK THE STATUS OF THE IMU.
037333,000062:
037334,000063: 30,2065 05504 TC UPFLAG
037335,000064: 30,2066 00141 ADRES MUNFLAG
037336,000065:
037337,000066: 30,2067 05504 TC UPFLAG # INSURE 4-JET TRANSLATION CAPABILITY.
037338,000067: 30,2070 00307 ADRES ACC4-2FL
037339,000068:
037340,000069: 30,2071 05504 TC UPFLAG # PREVENT R10 FROM ISSUING CROSS-POINTER
037341,000070: 30,2072 00015 ADRES R10FLAG # OUTPUTS.
037342,000071:
037343,000072: 30,2073 06011 TC CLRADMOD # INITIALIZE RADMODES FOR R29.
037344,000073:
037345,000074: 30,2074 05516 TC DOWNFLAG # CLEAR RENDEZVOUS FLAG FOR P22
037346,000075: 30,2075 00010 ADRES RNDVZFLG
037347,000076:
037348,000077: 30,2076 36000 CAF THRESH2 # INITIALIZE DVMON
037349,000078: 30,2077 55251 TS DVTHRUSH
037350,000079: 30,2100 34751 CAF FOUR
037351,000080: 30,2101 55515 TS DVCNTR
037352,000081:
037353,000082: 30,2102 34755 CA ZERO
037354,000083: 30,2103 55462 TS TRKMKCNT # SHOW THAT R29 DOWNLINK DATA ISN'T READY.
037355,000084: 30,2104 33035 CAF V06N33A
037356,000085: 30,2105 04616 TC BANKCALL # FLASH TIG
037357,000086: 30,2106 20476 CADR GOFLASH
037358,000087: 30,2107 16001 TCF GOTOPOOH
037359,000088: 30,2110 12112 TCF +2 # PROCEED
037360,000089: 30,2111 12104 TCF -5 # ENTER
037361,000090:
037362,000091: 30,2112 05353 TC PHASCHNG
037363,000092: 30,2113 04024 OCT 04024
037364,000093:
037365,000094: 30,2114 06037 TC INTPRET
037366,000095: 30,2115 77624 CALL # INITIALIZE WM AND /LAND/
037367,000096: 30,2116 46432 GUIDINIT
037368,000097: 30,2117 45014 SET CALL
037369,000098: 30,2120 04464 FLPI
037370,000099: 30,2121 60254 P12INIT
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Page 839 |
037372,000101: 30,2122 77745 P12LMB DLOAD
037373,000102: 30,2123 25761 (TGO)A # SET TGO TO AN INITIAL NOMINAL VALUE.
037374,000103: 30,2124 17517 STODL TGO
037375,000104: 30,2125 03442 TIG
037376,000105: 30,2126 34041 STCALL TDEC1
037377,000106: 30,2127 27057 LEMPREC # ROTATE THE STATE VECTORS TO THE
037378,000107: 30,2130 64375 VLOAD MXV # IGNITION TIME.
037379,000108: 30,2131 00007 VATT
037380,000109: 30,2132 01734 REFSMMAT
037381,000110: 30,2133 77772 VSL1
037382,000111: 30,2134 27601 STOVL V1S # COMPUTE V1S = VEL(TIG)*2(-7) M/CS.
037383,000112: 30,2135 00001 RATT
037384,000113: 30,2136 52521 MXV VSL6
037385,000114: 30,2137 01734 REFSMMAT
037386,000115: 30,2140 37521 STCALL R # COMPUTE R = POS(TIG)*2(-24) M.
037387,000116: 30,2141 67130 MUNGRAV # COMPUTE GDT1/2(TIG)*2(-7)M/CS.
037388,000117: 30,2142 53575 VLOAD UNIT
037389,000118: 30,2143 03521 R
037390,000119: 30,2144 37537 STCALL UNIT/R/ # COMPUTE UNIT/R/ FOR YCOMP.
037391,000120: 30,2145 57312 YCOMP
037392,000121: 30,2146 57461 SR DCOMP
037393,000122: 30,2147 20606 5D
037394,000123: 30,2150 17643 STODL XRANGE # INITIALIZE XRANGE FOR NOUN 76.
037395,000124: 30,2151 06456 VINJNOM
037396,000125: 30,2152 16277 STODL ZDOTD
037397,000126: 30,2153 06460 RDOTDNOM
037398,000127: 30,2154 02273 STORE RDOTD
037399,000128: 30,2155 77776 EXIT
037400,000129:
037401,000130: 30,2156 05353 TC PHASCHNG
037402,000131: 30,2157 04024 OCT 04024
037403,000132:
037404,000133: 30,2160 33034 NEWLOAD CAF V06N76 # FLASH CROSS-RANGE AND APOLUNE VALUES.
037405,000134: 30,2161 04616 TC BANKCALL
037406,000135: 30,2162 20476 CADR GOFLASH
037407,000136: 30,2163 16001 TCF GOTOPOOH
037408,000137: 30,2164 12166 TCF +2 # PROCEED
037409,000138: 30,2165 12160 TCF NEWLOAD # ENTER NEW DATA.
037410,000139:
037411,000140: 30,2166 32320 CAF P12ADRES
037412,000141: 30,2167 55455 TS WHICH
037413,000142:
037414,000143: 30,2170 05353 TC PHASCHNG
037415,000144: 30,2171 04024 OCT 04024
037416,000145:
037417,000146: 30,2172 06037 TC INTPRET
037418,000147: 30,2173 54345 DLOAD SL
037419,000148: 30,2174 03643 XRANGE
037420,000149: 30,2175 20206 5D
037421,000150: 30,2176 77615 DAD
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Page 840 |
037423,000152: 30,2177 02335 Y
037424,000153: 30,2200 27633 STOVL YCO
037425,000154: 30,2201 03537 UNIT/R/
037426,000155: 30,2202 53361 VXSC VAD
037427,000156: 30,2203 06454 49FPS
037428,000157: 30,2204 03601 V1S
037429,000158: 30,2205 03527 STORE V # V(TIPOVER) = V(IGN) + 57FPS (UNIT/R/)
037430,000159: 30,2206 72441 DOT SL1
037431,000160: 30,2207 03537 UNIT/R/
037432,000161: 30,2210 27474 STOVL RDOT # RDOT * 2(-7)
037433,000162: 30,2211 03537 UNIT/R/
037434,000163: 30,2212 53435 VXV UNIT
037435,000164: 30,2213 03720 QAXIS
037436,000165: 30,2214 03726 STORE ZAXIS1
037437,000166: 30,2215 77614 SETGO
037438,000167: 30,2216 04421 FLVR
037439,000168: 30,2217 60321 ASCENT
037440,000169: 30,2220 77745 P12RET DLOAD
037441,000170: 30,2221 02361 ATP # ATP(2)*2(18)
037442,000171: 30,2222 65316 DSQ PDDL
037443,000172: 30,2223 02355 ATY # ATY(2)*2(18)
037444,000173: 30,2224 43316 DSQ DAD
037445,000174: 30,2225 75454 BZE SQRT
037446,000175: 30,2226 60232 YAWDUN
037447,000176: 30,2227 55352 SL1 BDDV
037448,000177: 30,2230 02355 ATY
037449,000178: 30,2231 77736 ARCSIN
037450,000179: 30,2232 26363 YAWDUN STOVL YAW
037451,000180: 30,2233 03254 UNFC/2
037452,000181: 30,2234 50256 UNIT DOT
037453,000182: 30,2235 03537 UNIT/R/
037454,000183: 30,2236 65552 SL1 ARCCOS
037455,000184: 30,2237 77676 DCOMP
037456,000185: 30,2240 02365 STORE PITCH
037457,000186: 30,2241 77776 EXIT
037458,000187: 30,2242 05353 TC PHASCHNG
037459,000188: 30,2243 04024 OCT 04024
037460,000189:
037461,000190: 30,2244 05516 TC DOWNFLAG
037462,000191: 30,2245 00213 ADRES FLPI
037463,000192:
037464,000193: 30,2246 00004 INHINT
037465,000194: 30,2247 04674 TC IBNKCALL
037466,000195: 30,2250 40142 CADR PFLITEDB
037467,000196: 30,2251 00003 RELINT
037468,000197:
037469,000198: 30,2252 04635 TC POSTJUMP
037470,000199: 30,2253 74126 CADR BURNBABY
037471,000200:
037472,000201: 30,2254 77745 P12INIT DLOAD # INITIALIZE ENGINE DATA. USED FOR P12 AND
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Page 841 |
037474,000203: 30,2255 16013 (1/DV)A # P71.
037475,000204: 30,2256 03641 STORE 1/DV3
037476,000205: 30,2257 03637 STORE 1/DV2
037477,000206: 30,2260 17635 STODL 1/DV1
037478,000207: 30,2261 16017 (AT)A
037479,000208: 30,2262 16263 STODL AT
037480,000209: 30,2263 16021 (TBUP)A
037481,000210: 30,2264 16271 STODL TBUP
037482,000211: 30,2265 34013 ATDECAY
037483,000212: 30,2266 54276 DCOMP SL
037484,000213: 30,2267 20214 11D
037485,000214: 30,2270 02267 STORE TTO
037486,000215: 30,2271 57535 SLOAD DCOMP
037487,000216: 30,2272 26001 APSVEX
037488,000217: 30,2273 77702 SR2
037489,000218: 30,2274 02265 STORE VE
037490,000219: 30,2275 43414 BOFF RVQ
037491,000220: 30,2276 04747 FLAP
037492,000221: 30,2277 60300 COMMINIT
037493,000222: 30,2300 43345 COMMINIT DLOAD DAD # INITIALIZE TARGET DATA. USED BY P12, P70
037494,000223: 30,2301 25757 HINJECT # AND P71 IF IT DOES NOT FOLLOW P70.
037495,000224: 30,2302 02333 /LAND/
037496,000225: 30,2303 17631 STODL RCO
037497,000226: 30,2304 06522 HI6ZEROS
037498,000227: 30,2305 03654 STORE TXO
037499,000228: 30,2306 03633 STORE YCO
037500,000229: 30,2307 02273 STORE RDOTD
037501,000230: 30,2310 26275 STOVL YDOTD
037502,000231: 30,2311 01563 VRECTCSM
037503,000232: 30,2312 64235 VXV MXV
037504,000233: 30,2313 01555 RRECTCSM
037505,000234: 30,2314 01734 REFSMMAT
037506,000235: 30,2315 77656 UNIT
037507,000236: 30,2316 03720 STORE QAXIS
037508,000237: 30,2317 77616 RVQ
037509,000238: 30,2320 02022 P12ADRES REMADR P12TABLE
037510,000239:
037511,000240: 23,2000 SETLOC P12A
037512,000241: 23,2000 BANK
037513,000242: 23,2432 COUNT* $$/P12
037514,000243:
037515,000244: 23,2432 40220 GUIDINIT STQ SETPD
037516,000245: 23,2433 01164 TEMPR60
037517,000246: 23,2434 00001 0D
037518,000247: 23,2435 41575 VLOAD PUSH
037519,000248: 23,2436 06514 UNITZ
037520,000249: 23,2437 41434 RTB PUSH
037521,000250: 23,2440 21573 LOADTIME
037522,000251: 23,2441 77624 CALL
037523,000252: 23,2442 55716 RP-TO-R
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Page 842 |
037525,000254: 23,2443 74321 MXV VXSC
037526,000255: 23,2444 01734 REFSMMAT
037527,000256: 23,2445 16027 MOONRATE
037528,000257: 23,2446 26325 STOVL WM
037529,000258: 23,2447 02023 RLS
037530,000259: 23,2450 52446 ABVAL SL3
037531,000260: 23,2451 36333 STCALL /LAND/
037532,000261: 23,2452 01164 TEMPR60
037533,000262:
037534,000263: 23,2453 00046 07374 49FPS 2DEC .149352 B-6 # EXPECTED RDOT AT TIPOVER
037535,000264: 23,2455 04145 15527 VINJNOM 2DEC 16.7924 B-7 # 5509.5 FPS(APO=30NM WITH RDOT=19.5FPS)
037536,000265: 23,2457 00007 23346 RDOTDNOM 2DEC .059436 B-7 # 19.5 FPS
037537,000266:
037538,000267:
End of include-file P12.agc. Parent file is MAIN.agc