Source Code
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These source-code files are part of a reconstructed copy of Comanche 67, the
Apollo Guidance Computer (AGC) Command Module (CM) software for Apollo 12.
They have been adapted from sources files for Comanche 55, and updated via
disassembly of binary dumps of original core rope memory modules, part numbers
2003972-1081, 2003972-1091, 2003972-1111, 2003972-1121, 2003972-1131, and 2003972-1141.
Since only binary dumps (rather than listings) of Comanche 67 are available as source material,
all comments and labels are approximate.
They have been taken from other AGC programs where possible, or, in some places, written
from scratch to match what we believe would have been in the original listing.
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033547,000002: ## Copyright: Public domain.
033548,000003: ## Filename: LUNAR_AND_SOLAR_EPHEMERIDES_SUBROUTINES.agc
033549,000004: ## Purpose: A section of Comanche revision 067.
033550,000005: ## It is part of the reconstructed source code for the flight
033551,000006: ## software for the Command Module's (CM) Apollo Guidance Computer
033552,000007: ## (AGC) for Apollo 12. No original listings of this program are
033553,000008: ## available; instead, this file was created via dissassembly of
033554,000009: ## dumps of Comanche 067 core rope modules and comparison with
033555,000010: ## other AGC programs.
033556,000011: ## Assembler: yaYUL
033557,000012: ## Contact: Ron Burkey <info@sandroid.org>.
033558,000013: ## Website: www.ibiblio.org/apollo/index.html
033559,000014: ## Mod history: 2023-08-16 MAS Created from Comanche 055.
033560,000015:
033561,000016: # LUNAR AND SOLAR EPHEMERIDES SUBROUTINES
033562,000017:
033563,000018: # FUNCTIONAL DESCRIPTION
033564,000019:
033565,000020: # THESE SUBROUTINES ARE USED TO DETERMINE THE POSITION AND VELOCITY
033566,000021: # VECTORS OF THE SUN AND THE MOON RELATIVE TO THE EARTH AT THE
033567,000022: # SPECIFIED GROUND ELAPSED TIME INPUT BY THE USER.
033568,000023:
033569,000024: # THE POSITION OF THE MOON IS STORED IN THE COMPUTER IN THE FORM OF
033570,000025: # A NINTH DEGREE POLYNOMIAL APPROXIMATION WHICH IS VALID OVER A 15
033571,000026: # DAY INTERVAL BEGINNING SHORTLY BEFORE LAUNCH. THEREFORE THE TIME
033572,000027: # INPUT BY THE USER SHOULD FALL WITHIN THIS 15 DAY INTERVAL.
033573,000028:
033574,000029: # LSPOS COMPUTES THE POSITION VECTORS OF THE SUN AND THE MOON.
033575,000030:
033576,000031: # LUNPOS COMPUTES THE POSITION VECTOR OF THE MOON.
033577,000032:
033578,000033: # LUNVEL COMPUTES THE VELOCITY VECTOR OF THE MOON.
033579,000034:
033580,000035: # SOLPOS COMPUTES THE POSITION VECTOR OF THE SUN.
033581,000036:
033582,000037: # CALLING SEQUENCE
033583,000038:
033584,000039: # DLOAD CALL
033585,000040: # TIME GROUND ELAPSED TIME
033586,000041: # SUBROUTINE LSPOS OR LUNPOS OR LUNVEL OR SOLPOS
033587,000042:
033588,000043: # INPUT
033589,000044:
033590,000045: # 1) SPECIFIED GROUND ELAPSED TIME IN CS X B-28 LOADED IN MPAC.
033591,000046:
033592,000047: # 2) TIMEMO - TIME AT THE CENTER OF THE RANGE OVER WHICH THE LUNAR
033593,000048: # POSITION POLYNOMIAL IS VALID IN CS X B-42.
033594,000049:
033595,000050: # 3) VECOEM - VECTOR COEFFICIENTS OF THE LUNAR POSITION POLYNOMIAL
033596,000051: # LOADED IN DESCENDING SEQUENCE IN METERS/CS**N X B-2
033597,000052:
033598,000053: # 4) RESO - POSITION VECTOR OF THE SUN RELATIVE TO THE EARTH AT
033599,000054: # TIMEMO IN METERS X B-38.
033600,000055:
033601,000056: # 5) VESO - VELOCITY VECTOR OF THE SUN RELATIVE TO THE EARTH AT
033602,000057: # TIMEMO IN METERS/CS X B-9.
033603,000058: #
033604,000059: # 6) OMEGAES - ANGULAR VELOCITY OF THE VECTOR RESO AT TIMEMO IN
033605,000060: # REV/CS X B+26.
033606,000061:
033607,000062: # ALL EXCEPT THE FIRST INPUT ARE INCLUDED IN THE PRE-LAUNCH
033608,000063: # ERASABLE DATA LOAD.
033609,000064:
033610,000065: # OUTPUT - LSPOS
033611,000066:
033612,000067: # 1) 2D OF VAC AREA CONTAINS THE POSITION VECTOR OF THE SUN RELATIVE
033613,000068: # TO THE EARTH AT TIME INPUT BY THE USER IN METERS X B-38.
033614,000069:
033615,000070: # 2) MPAC CONTAINS THE POSITION VECTOR OF THE MOON RELATIVE TO THE
033616,000071: # EARTH AT TIME INPUT BY THE USER IN METERS X B-29.
033617,000072:
033618,000073: # OUTPUT - LUNPOS
033619,000074:
033620,000075: # MPAC CONTAINS THE POSITION VECTOR OF THE MOON RELATIVE TO THE
033621,000076: # EARTH AT THE TIME INPUT BY USER IN METERS X B-29.
033622,000077:
033623,000078: # OUTPUT - LUNVEL
033624,000079:
033625,000080: # MPAC CONTAINS THE VELOCITY VECTOR OF THE MOON RELATIVE TO THE
033626,000081: # EARTH AT TIME INPUT BY THE USER IN METERS/CS X B-7.
033627,000082:
033628,000083: # OUTPUT - SOLPOS
033629,000084:
033630,000085: # MPAC CONTAINS THE POSITION VECTOR OF THE SUN RELATIVE TO THE EARTH
033631,000086: # AT TIME INPUT BY THE USER IN METERS X B-38.
033632,000087:
033633,000088: # SUBROUTINES USED
033634,000089:
033635,000090: # NONE
033636,000091:
033637,000092: # REMARKS
033638,000093:
033639,000094: # THE VAC AREA IS USED FOR STORAGE OF INTERMEDIATE AND FINAL RESULTS
033640,000095: # OF COMPUTATIONS.
033641,000096:
033642,000097: # S1, X1 AND X2 ARE USED BY THESE SUBROUTINES.
033643,000098:
033644,000099: # PRELAUNCH ERASABLE DATA LOAD ARE ONLY ERASABLE STORAGE USED BY
033645,000100: # THESE SUBROUTINES.
033646,000101:
033647,000102: # RESTARTS DURING OPERATION OF THESE SUBROUTINES MUST BE HANDLED BY
033648,000103: # THE USER.
033649,000104:
033650,000105: 36,2466 BANK 36
033651,000106: 26,2000 SETLOC EPHEM
033652,000107: 26,2000 BANK
033653,000108:
033654,000109: 26,2110 COUNT* $$/EPHEM
033655,000110: 26,2110 E7,1777 EBANK= END-E7
033656,000111: 26,2110 77774 LSPOS AXT,2 # COMPUTES POSITION VECTORS OF BOTH THE
033657,000112: 26,2111 54161 RESA # SUN AND THE MOON. THE POSITION VECTOR
033658,000113: 26,2112 52170 AXT,1 GOTO # OF THE SUN IS STORED IN 2D OF THE VAC
033659,000114: 26,2113 54143 RES # AREA. THE POSITION VECTOR OF THE MOON
033660,000115: 26,2114 54126 LSTIME # IS STORED IN MPAC.
033661,000116: 26,2115 52170 LUNPOS AXT,1 GOTO # COMPUTES THE POSITION VECTOR OF THE MOON
033662,000117: 26,2116 54162 REM # AND STORES IT IN MPAC.
033663,000118: 26,2117 54126 LSTIME
033664,000119: 26,2120 52170 LUNVEL AXT,1 GOTO # COMPUTES THE VELOCITY VECTOR OF THE MOON
033665,000120: 26,2121 54173 VEM # AND STORES IT IN MPAC.
033666,000121: 26,2122 54126 LSTIME
033667,000122: 26,2123 76020 SOLPOS STQ AXT,1 # COMPUTES THE POSITION VECTOR OF THE SUN
033668,000123: 26,2124 00047 X2 # AND STORES IT IN MPAC.
033669,000124: 26,2125 54143 RES
033670,000125: 26,2126 54201 LSTIME SETPD SR
033671,000126: 26,2127 00001 0D
033672,000127: 26,2130 20617 14D
033673,000128: 26,2131 57571 TAD DCOMP
033674,000129: 26,2132 01707 TEPHEM
033675,000130: 26,2133 57571 TAD DCOMP
033676,000131: 26,2134 02034 TIMEMO
033677,000132: 26,2135 66261 SL SSP
033678,000133: 26,2136 20221 16D
033679,000134: 26,2137 00051 S1
033680,000135: 26,2140 00006 6D
033681,000136: 26,2141 77650 GOTO
033682,000137: 26,2142 00046 X1
033683,000138: 26,2143 41206 RES PUSH DMP # PD- 2
033684,000139: 26,2144 02147 OMEGAES
033685,000140: 26,2145 71406 PUSH COS # PD- 4
033686,000141: 26,2146 65361 VXSC PDDL # PD- 8
033687,000142: 26,2147 02133 RESO
033688,000143: 26,2150 63356 SIN PDVL # PD-10
033689,000144: 26,2151 02133 RESO
033690,000145: 26,2152 53406 PUSH UNIT # PD-16
033691,000146: 26,2153 53435 VXV UNIT
033692,000147: 26,2154 02141 VESO
033693,000148: 26,2155 76435 VXV VSL1 # PD-10
033694,000149: 26,2156 53361 VXSC VAD # PD-02
033695,000150: 26,2157 52172 VSL1 GOTO # RES IN METERS X B-38 IN MPAC.
033696,000151: 26,2160 00047 X2
033697,000152: 26,2161 14003 RESA STODL 2D # RES IN METERS X B-38 IN 2D OF VAC. PD- 0
033698,000153: 26,2162 63370 REM AXT,1 PDVL # PD- 2
033699,000154: 26,2163 00066 54D
033700,000155: 26,2164 02037 VECOEM
033701,000156: 26,2165 52761 REMA VXSC VAD*
033702,000157: 26,2166 00001 0D
033703,000158: 26,2167 02133 VECOEM +60D,1
033704,000159: 26,2170 72500 TIX,1 VSL2 # REM IN METERS X B-29 IN MPAC.
033705,000160: 26,2171 54165 REMA
033706,000161: 26,2172 77616 RVQ
033707,000162: 26,2173 65370 VEM AXT,1 PDDL # PD- 2
033708,000163: 26,2174 00060 48D
033709,000164: 26,2175 14214 NINEB4
033710,000165: 26,2176 74206 PUSH VXSC # PD- 4
033711,000166: 26,2177 02037 VECOEM
033712,000167: 26,2200 77761 VEMA VXSC
033713,000168: 26,2201 00001 0D
033714,000169: 26,2202 14005 STODL 4D # PD- 2
033715,000170: 26,2203 41425 DSU PUSH # PD- 4
033716,000171: 26,2204 14216 ONEB4
033717,000172: 26,2205 53357 VXSC* VAD
033718,000173: 26,2206 02125 VECOEM +54D,1
033719,000174: 26,2207 00005 4D
033720,000175: 26,2210 72500 TIX,1 VSL2 # VEM IN METERS/CS X B-7 IN MPAC.
033721,000176: 26,2211 54200 VEMA
033722,000177: 26,2212 77616 RVQ
033723,000178: 26,2213 22000 00000 NINEB4 2DEC 9.0 B-4
033724,000179:
033725,000180: 26,2215 02000 00000 ONEB4 2DEC 1.0 B-4
033726,000181:
033727,000182:
033728,000183:
End of include-file LUNAR_AND_SOLAR_EPHEMERIDES_SUBROUTINES.agc. Parent file is MAIN.agc