Source Code
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These source-code files are part of a reconstructed copy of Comanche 051, the
original release of the Apollo 11 Command Module (CM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Comanche 055 previously transcribed
from a digitized copy of that program. The code was then updated by undoing
changes related to the R-2 lunar potential model, using hints from program
comments and change-indicating asterisks in the Comanche 055 listing as a guide.
The reconstruction was verified by matching memory-bank checksums to those listed
in drawing 2021153D. Note that page numbers in the reconstructed code match those
on the Comanche 055 printout, although the added code would likely have changed page
numbers for a real Comanche 051 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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021452,000002: ## Copyright: Public domain.
021453,000003: ## Filename: R31.agc
021454,000004: ## Purpose: A section of Comanche revision 051.
021455,000005: ## It is part of the reconstructed source code for the
021456,000006: ## original release of the flight software for the Command
021457,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 11.
021458,000008: ## The code has been recreated from a copy of Comanche 055. It
021459,000009: ## has been adapted such that the resulting bugger words
021460,000010: ## exactly match those specified for Comanche 51 in NASA drawing
021461,000011: ## 2021153D, which gives relatively high confidence that the
021462,000012: ## reconstruction is correct.
021463,000013: ## Reference: pp. 505-510
021464,000014: ## Assembler: yaYUL
021465,000015: ## Contact: Ron Burkey <info@sandroid.org>.
021466,000016: ## Website: www.ibiblio.org/apollo/index.html
021467,000017: ## Mod history: 2019-07-30 MAS Created from Comanche 55.
021468,000018:
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Page 505
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021470,000020: 34,2002 BANK 34
021471,000021: 31,2000 SETLOC R31
021472,000022: 31,2000 BANK
021473,000023:
021474,000024: 31,2000 COUNT* $$/R31
021475,000025:
021476,000026: 31,2000 35057 R31CALL CAF PRIO3
021477,000027: 31,2001 05147 TC FINDVAC
021478,000028: 31,2002 E4,1770 EBANK= SUBEXIT
021479,000029: 31,2002 02032 62064 2CADR V83CALL
021480,000030:
021481,000031: 31,2004 35041 DSPDELAY CAF 1SEC
021482,000032: 31,2005 04662 TC BANKCALL
021483,000033: 31,2006 01732 CADR DELAYJOB
021484,000034: 31,2007 31044 CA EXTVBACT
021485,000035: 31,2010 75004 MASK BIT12
021486,000036: 31,2011 00006 EXTEND
021487,000037: 31,2012 12004 BZF DSPDELAY
021488,000038:
021489,000039: 31,2013 30105 DISPN5X CA FLAGWRD9 # TEST R31FLAG (IN SUNDANCE R31FLAG WILL
021490,000040: 31,2014 75014 MASK BIT4 # ALWAYS BE SET AS R34 DOES NOT EXIST)
021491,000041: 31,2015 00006 EXTEND
021492,000042: 31,2016 12021 BZF +3
021493,000043: 31,2017 32136 CAF V16N54 # R31 USE NOUN 54
021494,000044: 31,2020 02022 TC +2
021495,000045: 31,2021 32137 CAF V16N53 # R34 USE NOUN 53
021496,000046: 31,2022 04662 TC BANKCALL
021497,000047: 31,2023 20561 CADR GOMARKF
021498,000048: 31,2024 05625 TC B5OFF
021499,000049: 31,2025 05625 TC B5OFF
021500,000050: 31,2026 12013 TCF DISPN5X
021501,000051:
021502,000052: 31,2027 06006 V83 TC INTPRET
021503,000053: 31,2030 77650 GOTO
021504,000054: 31,2031 62171 HAVEBASE # INTEG STATE VECTORS
021505,000055: 31,2032 06006 V83CALL TC INTPRET
021506,000056: 31,2033 77650 GOTO
021507,000057: 31,2034 62140 STATEXTP # EXTRAPOLATE STATE VECTORS
021508,000058: 31,2035 52375 COMPDISP VLOAD VSU
021509,000059: 31,2036 00001 RATT
021510,000060: 31,2037 02327 RONE
021511,000061: 31,2040 51406 PUSH ABVAL # RATT-RONE TO 0D PD= 6
021512,000062: 31,2041 02321 STORE RANGE # METERS B-29
021513,000063: 31,2042 77301 NORM VLOAD
021514,000064: 31,2043 00047 X1 # RATT-RONE PD= 0
021515,000065: 31,2044 77762 VSR1
021516,000066: 31,2045 53457 VSL* UNIT
021517,000067: 31,2046 20201 0,1
021518,000068: 31,2047 52315 PDVL VSU # UNIT(LOS) TO 0D PD= 6
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Page 506
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021520,000070: 31,2050 00007 VATT
021521,000071: 31,2051 02335 VONE
021522,000072: 31,2052 77641 DOT # (VATT-VONE).UNIT(LOS) PD= 0
021523,000073: 31,2053 77752 SL1
021524,000074: 31,2054 36323 STCALL RRATE # RANGE RATE M/CS B-7
021525,000075: 31,2055 47477 CDUTRIG # TO INITIALIZE FOR *NBSM*
021526,000076: 31,2056 77624 CALL
021527,000077: 31,2057 62311 R34LOS # NOTE. PDL MUST = 0.
021528,000078: 31,2060 53575 R34ANG VLOAD UNIT
021529,000079: 31,2061 02327 RONE
021530,000080: 31,2062 77715 PDVL # UR TO 0D PD= 6
021531,000081: 31,2063 15333 THISAXIS # UNITX FOR CM, UNITZ FOR LM
021532,000082: 31,2064 77214 BON VLOAD # CHK R31FLAG. ON=R31 THETA, OFF=R34 PHI
021533,000083: 31,2065 04713 R31FLAG
021534,000084: 31,2066 62070 +2 # R31-THETA
021535,000085: 31,2067 00015 12D
021536,000086: 31,2070 77624 CALL
021537,000087: 31,2071 47646 *NBSM*
021538,000088: 31,2072 41505 VXM PUSH # UXORZ TO 6D PD=12D
021539,000089: 31,2073 01736 REFSMMAT
021540,000090: 31,2074 72431 VPROJ VSL2
021541,000091: 31,2075 00001 0D
021542,000092: 31,2076 53445 BVSU UNIT
021543,000093: 31,2077 00007 6D
021544,000094: 31,2100 47315 PDVL VXV # UP/2 TO 12D PD=18D
021545,000095: 31,2101 02327 RONE
021546,000096: 31,2102 02335 VONE
021547,000097: 31,2103 47256 UNIT VXV
021548,000098: 31,2104 02327 RONE
021549,000099: 31,2105 63241 DOT PDVL # SIGN TO 12D, UP/2 TO MPAC PD=18D
021550,000100: 31,2106 00015 12D
021551,000101: 31,2107 50372 VSL1 DOT # UP.UXORZ
021552,000102: 31,2110 00007 6D
021553,000103: 31,2111 72565 SIGN SL1
021554,000104: 31,2112 00015 12D
021555,000105: 31,2113 77726 ACOS
021556,000106: 31,2114 26325 STOVL RTHETA
021557,000107: 31,2115 02327 RONE
021558,000108: 31,2116 51041 DOT BPL
021559,000109: 31,2117 00007 6D
021560,000110: 31,2120 62125 +5
021561,000111: 31,2121 44345 DLOAD BDSU # IF UXORZ.R NEG, RTHETA = 1 - RTHETA
021562,000112: 31,2122 02325 RTHETA
021563,000113: 31,2123 15343 DPPOSMAX
021564,000114: 31,2124 02325 STORE RTHETA # RTHETA BETWEEN 0 AND 1 REV.
021565,000115: 31,2125 77776 EXIT
021566,000116: 31,2126 35013 CAF BIT5 # HAVE WE BEEN ANSWERED
021567,000117: 31,2127 71044 MASK EXTVBACT
021568,000118: 31,2130 00006 EXTEND
021569,000119: 31,2131 15534 BZF ENDEXT # YES, DIE
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Page 507
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021571,000121: 31,2132 41044 CS EXTVBACT
021572,000122: 31,2133 75004 MASK BIT12
021573,000123: 31,2134 27044 ADS EXTVBACT
021574,000124:
021575,000125: 31,2135 12027 TCF V83
021576,000126: 31,2136 04066 V16N54 VN 1654
021577,000127: 31,2137 04065 V16N53 VN 1653
021578,000128:
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Page 508
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021580,000130: # STATEXTP DOES AN INITIAL PRECISION EXTRAPOLATION OF THE
021581,000131: # LEM STATE VECTOR TO PRESENT TIME OR TO PIPTIME IF AV G
021582,000132: # IS ON AND SAVES AS BASE VECTOR. IF AV G IS ON RN + VN
021583,000133: # ARE USED AS THE CM STATE VECTOR AND THE INITIAL R RDOT
021584,000134: # RTHETA ARE COMPUTED WITH NO FURTHER INTEGRATION. IF AV
021585,000135: # G IS OFF A PRECISION EXTRAPOLATION IS MADE OF THE CM
021586,000136: # STATE VECTOR TO PRESENT TIME AND.....
021587,000137:
021588,000138: # THE CM + LM STATE VECTORS ARE INTEGRATED TO PRES TIME
021589,000139: # USING PRECISION OR CONIC AS SURFFLAG IS SET OR CLEAR.
021590,000140:
021591,000141: # IF AV G IS ON THEN SUBSEQUENT PASSES WILL PROVIDE
021592,000142: # USE OF RN + VN AS CM STATE VECTOR AND THE LM STATE
021593,000143: # VECTOR WILL BE PRECISION INTEGRATED USING LEMPREC
021594,000144:
021595,000145: # IF SURFFLAG IS SET.
021596,000146: # CM STATE VECTOR RONE VONE + LM STATE VECTOR RATT
021597,000147: # VATT ARE USED IN COMPUTING R RDOT RTHETA.
021598,000148:
021599,000149:
021600,000150: 31,2140 43034 STATEXTP RTB BOF # INITIAL INTEGRATION
021601,000151: 31,2141 45510 LOADTIME
021602,000152: 31,2142 03751 V37FLAG
021603,000153: 31,2143 62146 +3 # AV G OFF, USE PRES TIME
021604,000154: 31,2144 77624 CALL
021605,000155: 31,2145 62273 GETRVN # ON, USE RN VN PIPTIME
021606,000156: 31,2146 02343 STORE BASETIME # PRES TIME OR PIPTIME
021607,000157: 31,2147 34041 STCALL TDEC1
021608,000158: 31,2150 27105 LEMPREC
021609,000159: 31,2151 77775 VLOAD # BASE VECTOR, LM
021610,000160: 31,2152 00017 RATT1
021611,000161: 31,2153 26225 STOVL BASEOTP # POS.
021612,000162: 31,2154 00025 VATT1
021613,000163: 31,2155 02241 STORE BASEOTV # VEL.
021614,000164: 31,2156 71214 BON DLOAD
021615,000165: 31,2157 03711 V37FLAG
021616,000166: 31,2160 62035 COMPDISP # COMPUTE R RDOT RTHETA FROM
021617,000167: # RONE(RN) VONE(VN) RATT+VATT(LEMPREC)
021618,000168: 31,2161 00015 TAT
021619,000169: 31,2162 34041 STCALL TDEC1
021620,000170: 31,2163 27071 CSMPREC
021621,000171: 31,2164 77775 VLOAD # BASE VECTOR, CM
021622,000172: 31,2165 00017 RATT1
021623,000173: 31,2166 26255 STOVL BASETHP # POS.
021624,000174: 31,2167 00025 VATT1
021625,000175: 31,2170 02263 STORE BASETHV # VEL.
021626,000176: 31,2171 47014 HAVEBASE BON RTB # SUBSEQUENT INTEGRATIONS
021627,000177: 31,2172 03711 V37FLAG
021628,000178: 31,2173 62256 GETRVN5
021629,000179: 31,2174 45510 LOADTIME
021630,000180: 31,2175 34041 STCALL TDEC1 # AV G OFF. SET INTEG. OF CM
021631,000181: 31,2176 27442 INTSTALL
021632,000182: 31,2177 43175 VLOAD CLEAR
021633,000183: 31,2200 02255 BASETHP
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Page 509
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021635,000185: 31,2201 00263 MOONFLAG
021636,000186: 31,2202 25535 STOVL RCV
021637,000187: 31,2203 02263 BASETHV
021638,000188: 31,2204 15543 STODL VCV
021639,000189: 31,2205 02343 BASETIME
021640,000190: 31,2206 43014 BOF SET # GET APPROPRIATE MOONFLAG SETTING
021641,000191: 31,2207 04343 MOONTHIS
021642,000192: 31,2210 62212 +2
021643,000193: 31,2211 00063 MOONFLAG
021644,000194: 31,2212 77614 CLEAR
021645,000195: 31,2213 01673 INTYPFLG
021646,000196: 31,2214 43014 BON SET
021647,000197: 31,2215 04307 SURFFLAG
021648,000198: 31,2216 62220 +2 # PREC. IF LM DOWN
021649,000199: 31,2217 01473 INTYPFLG # CONIC IF LM NOT DOWN
021650,000200: 31,2220 35517 STCALL TET
021651,000201: 31,2221 27135 INTEGRVS # INTEGRATION --- AT LAST---
021652,000202: 31,2222 77775 VLOAD
021653,000203: 31,2223 00001 RATT
021654,000204: 31,2224 26327 STOVL RONE
021655,000205: 31,2225 00007 VATT
021656,000206: 31,2226 16335 STODL VONE # GET SET FOR CONIC EXTRAP.,OTHER
021657,000207: 31,2227 00015 TAT
021658,000208: 31,2230 45014 BON CALL
021659,000209: 31,2231 04307 SURFFLAG
021660,000210: 31,2232 62267 GETRVN6 # LEMPREC IF LM DOWN
021661,000211: 31,2233 27442 INTSTALL # ..CONIC IF NOT DOWN
021662,000212: 31,2234 77614 SET
021663,000213: 31,2235 01473 INTYPFLG
021664,000214: 31,2236 00041 OTHINT STORE TDEC1 # ENTERED IF AV G ON TO INTEG LM
021665,000215: 31,2237 43175 VLOAD CLEAR
021666,000216: 31,2240 02225 BASEOTP
021667,000217: 31,2241 00263 MOONFLAG
021668,000218: 31,2242 25535 STOVL RCV
021669,000219: 31,2243 02241 BASEOTV
021670,000220: 31,2244 15543 STODL VCV
021671,000221: 31,2245 02343 BASETIME
021672,000222: 31,2246 43014 BOF SET
021673,000223: 31,2247 04343 MOONTHIS
021674,000224: 31,2250 62252 +2
021675,000225: 31,2251 00063 MOONFLAG
021676,000226: 31,2252 35517 STCALL TET
021677,000227: 31,2253 27135 INTEGRVS
021678,000228: 31,2254 77650 GOTO
021679,000229: 31,2255 62035 COMPDISP # COMPUTE R RDOT RTHETA
021680,000230: 31,2256 77624 GETRVN5 CALL # AV G ON
021681,000231: 31,2257 62273 GETRVN
021682,000232: 31,2260 45014 BON CALL
021683,000233: 31,2261 04307 SURFFLAG
021684,000234: 31,2262 62267 GETRVN6 # LM DOWN, LMPREC
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Page 510
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021686,000236: 31,2263 27442 INTSTALL
021687,000237: 31,2264 52014 CLEAR GOTO
021688,000238: 31,2265 01673 INTYPFLG
021689,000239: 31,2266 62236 OTHINT
021690,000240: 31,2267 34041 GETRVN6 STCALL TDEC1
021691,000241: 31,2270 27105 LEMPREC
021692,000242: 31,2271 77650 GOTO
021693,000243: 31,2272 62035 COMPDISP # COMPUTE R RDOT RTHETA
021694,000244: 31,2273 77620 GETRVN STQ
021695,000245: 31,2274 00000 0D
021696,000246: 31,2275 52175 VLOAD GOTO # AV G ON, RONE = RN VONE = VN
021697,000247: 31,2276 01171 RN # AND USE PIPTIME
021698,000248: 31,2277 62300 +1
021699,000249: 31,2300 36327 STCALL RONE
021700,000250: 31,2301 62302 +1
021701,000251: 31,2302 52175 VLOAD GOTO
021702,000252: 31,2303 01177 VN
021703,000253: 31,2304 62305 +1
021704,000254: 31,2305 16335 STODL VONE
021705,000255: 31,2306 01205 PIPTIME
021706,000256: 31,2307 77650 GOTO
021707,000257: 31,2310 00000 0D
021708,000258: 31,2000 SETLOC R34
021709,000259: 31,2000 BANK
021710,000260: 31,2311 77776 R34LOS EXIT
021711,000261: 31,2312 30036 CA CDUS
021712,000262: 31,2313 50120 INDEX FIXLOC
021713,000263: 31,2314 54011 TS 9D
021714,000264: 31,2315 30035 CA CDUT
021715,000265: 31,2316 50120 INDEX FIXLOC
021716,000266: 31,2317 54013 TS 11D
021717,000267: 31,2320 30120 CA FIXLOC
021718,000268: 31,2321 66211 AD SIX
021719,000269: 31,2322 40000 COM
021720,000270: 31,2323 50120 INDEX FIXLOC
021721,000271: 31,2324 54046 TS X1
021722,000272: 31,2325 06006 TC INTPRET
021723,000273: 31,2326 77624 CALL
021724,000274: 31,2327 46000 SXTNB
021725,000275: 31,2330 34015 STCALL 12D
021726,000276: 31,2331 62060 R34ANG
End of include-file R31.agc. Parent file is MAIN.agc