Source Code
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These source-code files are part of a reconstructed copy of Artemis 071, the
first release of the Apollo 15 through 17 Command Module (CM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with source code of Artemis 072 previously transcribed
from a digitized copy of that program. The code was then updated by undoing
changes between the two versions. The reconstruction was verified by matching
memory-bank checksums to those listed in drawing 2021154-. Note that page
numbers in the reconstructed code match those on the Artemis 072 printout,
although the changed code would likely have changed page numbers for a real
Artemis 071 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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022447,000002: ## Copyright: Public domain.
022448,000003: ## Filename: P76.agc
022449,000004: ## Purpose: A section of Artemis revision 071.
022450,000005: ## It is part of the reconstructed source code for the first
022451,000006: ## release of the flight software for the Command Module's
022452,000007: ## (CM) Apollo Guidance Computer (AGC) for Apollo 15 through
022453,000008: ## 17. The code has been recreated from a copy of Artemis 072.
022454,000009: ## It has been adapted such that the resulting bugger words
022455,000010: ## exactly match those specified for Artemis 071 in NASA
022456,000011: ## drawing 2021154-, which gives relatively high confidence
022457,000012: ## that the reconstruction is correct.
022458,000013: ## Reference: 513
022459,000014: ## Assembler: yaYUL
022460,000015: ## Contact: Ron Burkey <info@sandroid.org>.
022461,000016: ## Website: www.ibiblio.org/apollo/index.html
022462,000017: ## Mod history: 2019-08-14 MAS Created from Artemis 072.
022463,000018:
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Page 513
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022465,000020: # 1) PROGRAM NAME - TARGET DELTA V PROGRAM (P76).
022466,000021: # 2) FUNCTIONAL DESCRIPTION - UPON ENTRY BY ASTRONAUT ACTION, P76 FLASHES DSKY REQUESTS TO THE ASTRONAUT
022467,000022: # TO PROVIDE VIA DSKY (1) THE DELTA V TO BE APPLIED TO THE OTHER VEHICLE STATE VECTOR AND (2) THE
022468,000023: # TIME (TIG) AT WHICH THE OTHER VEHICLE VELOCITY WAS CHANGED BY EXECUTION OF A THRUSTING MANEUVER. THE
022469,000024: # OTHER VEHICLE STATE VECTOR IS INTEGRATED TO TIG AND UPDATED BY THE ADDITION OF DELTA V (DELTA V HAVING
022470,000025: # BEEN TRANSFORMED FROM LV TO REF COSYS). USING INTEGRVS, THE PROGRAM THEN INTEGRATES THE OTHER
022471,000026: # VEHICLE STATE VECTOR TO THE STATE VECTOR OF THIS VEHICLE, THUS INSURING THAT THE W-MATRIX AND BOTH VEHICLE
022472,000027: # STATES CORRESPOND TO THE SAME TIME.
022473,000028: # 3) ERASABLE INITIALIZATION REQUIRED - NONE.
022474,000029: # 4) CALLING SEQUENCES AND EXIT MODES - CALLED BY ASTRONAUT REQUEST THRU DSKY V 37 E 76 E.
022475,000030: # EXITS BY TCF ENDOFJOB.
022476,000031: # 5) OUTPUT - OTHER VEHICLE STATE VECTOR INTEGRATED TO TIG AND INCREMENTED BY DELTA V IN REF COSYS.
022477,000032: # THE PUSHLIST CONTAINS THE MATRIX BY WHICH THE INPUT DELTA V MUST BE POST-MULTIPLIED TO CONVERT FROM LV
022478,000033: # TO REF COSYS.
022479,000034: # 6) DEBRIS - OTHER VEHICLE STATE VECTOR.
022480,000035: # 7) SUBROUTINES CALLED - BANKCALL,GOXDSPF,CSMPREC (OR LEMPREC),ATOPCSM (OR ATOPLEM),INTSTALL,INTWAKE, PHASCHNG
022481,000036: # INTPRET, INTEGRVS, AND MINIRECT.
022482,000037: # 8) FLAG USE - MOONFLAG,CMOONFLAG,INTYPFLG,RASFLAG, AND MARKCTR.
022483,000038:
022484,000039: 13,2000 SETLOC P76LOC
022485,000040: 13,2000 BANK
022486,000041:
022487,000042: 13,2071 COUNT* $$/P7677
022488,000043: 13,2071 E7,1412 EBANK= TIG
022489,000044:
022490,000045: 13,2071 31214 P76ER77 CA MODREG
022491,000046: 13,2072 74770 MASK BIT1
022492,000047: 13,2073 55545 TS OPTFLAG # OPTFLAG = 0 LM (P76)
022493,000048: 13,2074 00006 EXTEND # = 1 CSM (P77)
022494,000049: 13,2075 31450 DCA NOMTIG
022495,000050: 13,2076 53413 DXCH TIG
022496,000051:
022497,000052: 13,2077 35026 CAF V06N33
022498,000053: 13,2100 04636 TC BANKCALL # AND WAIT FOR KEYBOARD ACTION
022499,000054: 13,2101 20743 CADR GOFLASH
022500,000055: 13,2102 12234 TCF ENDP76
022501,000056: 13,2103 02105 TC +2 # PROCEED
022502,000057: 13,2104 02077 TC -5 # STORE DATA AND REPEAT FLASHING
022503,000058: 13,2105 05402 TC PHASCHNG
022504,000059: 13,2106 04024 OCT 04024
022505,000060: 13,2107 51545 INDEX OPTFLAG
022506,000061: 13,2110 32237 CAF V06N84 # FLASH V06 N84 OR N81
022507,000062: 13,2111 04636 TC BANKCALL # AND WAIT FOR KEYBOARD ACTION.
022508,000063: 13,2112 20743 CADR GOFLASH
022509,000064: 13,2113 12234 TCF ENDP76
022510,000065: 13,2114 02116 TC +2
022511,000066: 13,2115 02107 TC -6 # STORE DATA AND REPEAT FLASHING
022512,000067: 13,2116 06006 TC INTPRET # RETURN TO INTERPRETIVE CODE
022513,000068: 13,2117 43145 DLOAD SET # SET D(MPAC)=TIG IN CSEC B28
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Page 514
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022515,000070: 13,2120 03413 TIG
022516,000071: 13,2121 01076 NODOFLAG # DISALLOW V37
022517,000072: 13,2122 00041 STORE TDEC1
022518,000073: 13,2123 77711 CCALL
022519,000074: 13,2124 03546 OPTFLAG
022520,000075: 13,2125 26241 INTADR
022521,000076: 13,2126 53575 COMPMAT VLOAD UNIT
022522,000077: 13,2127 00001 RATT
022523,000078: 13,2130 77676 VCOMP # U(-R)
022524,000079: 13,2131 00031 STORE 24D # U(-R) TO 24D
022525,000080: 13,2132 53435 VXV UNIT # U(-R)XV = U(VXR)
022526,000081: 13,2133 00007 VATT
022527,000082: 13,2134 00023 STORE 18D
022528,000083: 13,2135 53435 VXV UNIT # U(VXR)XU(-R) = U((RXV)XR)
022529,000084: 13,2136 00031 24D
022530,000085: 13,2137 00015 STORE 12D
022531,000086: 13,2140 46135 SLOAD BHIZ
022532,000087: 13,2141 03546 OPTFLAG
022533,000088: 13,2142 26146 +4
022534,000089: 13,2143 52175 VLOAD GOTO
022535,000090: 13,2144 03405 DELVLVC # FROM CSM
022536,000091: 13,2145 26150 DVTRANS
022537,000092: 13,2146 77775 VLOAD
022538,000093: 13,2147 03540 DELVOV # FROM LM
022539,000094: 13,2150 76505 DVTRANS VXM VSL1 # V(MPAC)=DELTA-V IN REFCOSYS
022540,000095: 13,2151 00015 12D
022541,000096: 13,2152 77655 VAD
022542,000097: 13,2153 00007 VATT
022543,000098: 13,2154 00007 STORE 6 # V(PD6)=VATT + DELTA V
022544,000099: 13,2155 77624 CALL # PREVENT WOULD-BE USER OF ORBITAL
022545,000100: 13,2156 27516 INTSTALL # INTEG FROM INTERFERING WITH UPDATING
022546,000101: 13,2157 77624 CALL
022547,000102: 13,2160 26245 P76SUB1
022548,000103: 13,2161 53775 VLOAD VSR*
022549,000104: 13,2162 00007 6
022550,000105: 13,2163 57176 0,2
022551,000106: 13,2164 25543 STOVL VCV
022552,000107: 13,2165 00001 RATT
022553,000108: 13,2166 77657 VSR*
022554,000109: 13,2167 57176 0,2
022555,000110: 13,2170 15535 STODL RCV
022556,000111: 13,2171 03413 TIG
022557,000112: 13,2172 01517 STORE TET
022558,000113: 13,2173 71214 CLEAR DLOAD
022559,000114: 13,2174 01673 INTYPFLG
022560,000115: 13,2175 01571 TETTHIS
022561,000116: 13,2176 34041 INTOTHIS STCALL TDEC1
022562,000117: 13,2177 27211 INTEGRVS
022563,000118: 13,2200 77624 CALL
022564,000119: 13,2201 27516 INTSTALL
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Page 515
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022566,000121: 13,2202 77624 CALL
022567,000122: 13,2203 26245 P76SUB1 # SET/CLEAR MOONFLAG
022568,000123: 13,2204 77775 VLOAD
022569,000124: 13,2205 00017 RATT1
022570,000125: 13,2206 01503 STORE RRECT
022571,000126: 13,2207 15535 STODL RCV
022572,000127: 13,2210 00015 TAT
022573,000128: 13,2211 25517 STOVL TET
022574,000129: 13,2212 00025 VATT1
022575,000130: 13,2213 77624 CALL
022576,000131: 13,2214 23434 MINIRECT
022577,000132: 13,2215 77776 EXIT
022578,000133: 13,2216 05402 TC PHASCHNG
022579,000134: 13,2217 04024 OCT 04024
022580,000135:
022581,000136: 13,2220 06006 TC INTPRET
022582,000137: 13,2221 62214 SET CCALL
022583,000138: 13,2222 05062 REINTFLG
022584,000139: 13,2223 03546 OPTFLAG
022585,000140: 13,2224 26243 UPDATADR
022586,000141: 13,2225 77624 CALL
022587,000142: 13,2226 27525 INTWAKE0 # PERMIT USE OF ORBITAL INTEGRATION
022588,000143: 13,2227 77414 OUT CLEAR EXIT # ALLOW V37, NO NEED TO CLEAR NODOFLAG AT
022589,000144: 13,2230 01276 NODOFLAG # ENDP76 SINCE FLAG NOT SET WHEN DISPLAY
022590,000145: # RESPONSES TRANSFER THERE FROM P76+.
022591,000146: 13,2231 37702 CAF NEGONE
022592,000147: 13,2232 55722 TS MRKBUF1
022593,000148: 13,2233 14105 TCF MNKGOPOO
022594,000149:
022595,000150: 13,2234 37702 ENDP76 CAF NEGONE
022596,000151: 13,2235 55722 TS MRKBUF1 # INVALIDATE MARK BUFFER
022597,000152:
022598,000153: 13,2236 14103 TCF GOTOPOOH
022599,000154:
022600,000155: 13,2237 01524 V06N84 NV 0684
022601,000156: 13,2240 01521 NV 0681 # MUST BE EQUAL TO V06N84 + 1
022602,000157: 13,2241 27161 INTADR CADR OTHPREC
022603,000158: 13,2242 27145 CADR THISPREC # MUST BE EQUAL TO INTADR + 1
022604,000159: 13,2243 27034 UPDATADR CADR ATOPOTH
022605,000160: 13,2244 26761 CADR ATOPTHIS # MUST BE EQUAL TO UPDATADR + 1
022606,000161: 13,2245 67214 P76SUB1 CLEAR SLOAD
022607,000162: 13,2246 00263 MOONFLAG
022608,000163: 13,2247 00050 X2
022609,000164: 13,2250 43030 BHIZ SET # X2=0...CLEAR MOONFLAG
022610,000165: 13,2251 26253 +2 # =2.....SET MOONFLAG
022611,000166: 13,2252 00063 MOONFLAG
022612,000167: 13,2253 77616 RVQ
End of include-file P76.agc. Parent file is MAIN.agc