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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043850,000002: ## Copyright: Public domain.
043851,000003: ## Filename: MYSUBS.agc
043852,000004: ## Purpose: A section of Artemis revision 071.
043853,000005: ## It is part of the reconstructed source code for the first
043854,000006: ## release of the flight software for the Command Module's
043855,000007: ## (CM) Apollo Guidance Computer (AGC) for Apollo 15 through
043856,000008: ## 17. The code has been recreated from a copy of Artemis 072.
043857,000009: ## It has been adapted such that the resulting bugger words
043858,000010: ## exactly match those specified for Artemis 071 in NASA
043859,000011: ## drawing 2021154-, which gives relatively high confidence
043860,000012: ## that the reconstruction is correct.
043861,000013: ## Reference: 997
043862,000014: ## Assembler: yaYUL
043863,000015: ## Contact: Ron Burkey <info@sandroid.org>.
043864,000016: ## Website: www.ibiblio.org/apollo/index.html
043865,000017: ## Mod history: 2019-08-14 MAS Created from Artemis 072.
043866,000018:
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Page 997
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043868,000020:
043869,000021: 21,2000 SETLOC MYSUBS
043870,000022: 21,2000 BANK
043871,000023:
043872,000024: 21,2060 E6,1510 EBANK= KMPAC
043873,000025: 21,2060 5060 SPCOS1 EQUALS SPCOS
043874,000026: 21,2060 5061 SPSIN1 EQUALS SPSIN
043875,000027: 21,2060 5060 SPCOS2 EQUALS SPCOS
043876,000028: 21,2060 5061 SPSIN2 EQUALS SPSIN
043877,000029:
043878,000030: 21,2060 COUNT* $$/DAPMS
043879,000031:
043880,000032: # ONE AND ONE HALF PRECISION MULTIPLICATION ROUTINE
043881,000033:
043882,000034: 21,2060 55512 SMALLMP TS KMPTEMP # A(X+Y)
043883,000035: 21,2061 00006 EXTEND
043884,000036: 21,2062 71511 MP KMPAC +1
043885,000037: 21,2063 55511 TS KMPAC +1 # AY
043886,000038: 21,2064 34772 CAF ZERO
043887,000039: 21,2065 57510 XCH KMPAC
043888,000040: 21,2066 00006 EXTEND
043889,000041: 21,2067 71512 MP KMPTEMP # AX
043890,000042: 21,2070 21511 DAS KMPAC # AX+AY
043891,000043: 21,2071 00002 TC Q
043892,000044:
043893,000045: # SUBROUTINE FOR DOUBLE PRECISION ADDITIONS OF ANGLES
043894,000046: # A AND L CONTAIN A DP(1S) ANGLE SCALED BY 180 DEGS TO BE ADDED TO KMPAC.
043895,000047: # RESULT IS PLACED IN KMPAC. TIMING = 6 MCT (22 MCT ON OVERFLOW)
043896,000048:
043897,000049: 21,2072 21511 DPADD DAS KMPAC
043898,000050: 21,2073 00006 EXTEND
043899,000051: 21,2074 12111 BZF TSK +1 # NO OVERFLOW
043900,000052: 21,2075 11510 CCS KMPAC
043901,000053: 21,2076 12112 TCF DPADD+ # + OVERFLOW
043902,000054: 21,2077 12101 TCF +2
043903,000055: 21,2100 12114 TCF DPADD- # - OVERFLOW
043904,000056: 21,2101 11511 CCS KMPAC +1
043905,000057: 21,2102 12117 TCF DPADD2+ # UPPER = 0, LOWER +
043906,000058: 21,2103 12105 TCF +2
043907,000059: 21,2104 40000 COM # UPPER = 0, LOWER -
043908,000060: 21,2105 64750 AD POSMAX # LOWER = 0, A=0
043909,000061: 21,2106 55511 TS KMPAC +1 # CAN NOT OVERFLOW
043910,000062: 21,2107 34750 CA POSMAX # UPPER WAS = 0
043911,000063: 21,2110 55510 TSK TS KMPAC
043912,000064: 21,2111 00002 +1 TC Q
043913,000065: 21,2112 64752 DPADD+ AD NEGMAX # KMPAC GREATER THAN 0
043914,000066: 21,2113 12110 TCF TSK
043915,000067:
043916,000068: 21,2114 40000 DPADD- COM
043917,000069: 21,2115 64750 AD POSMAX # KMPAC LESS THAN 0
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Page 998
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043919,000071: 21,2116 12110 TCF TSK
043920,000072:
043921,000073: 21,2117 64752 DPADD2+ AD NEGMAX # CAN NOT OVERFLOW
043922,000074: 21,2120 55511 TS KMPAC +1
043923,000075: 21,2121 34752 CA NEGMAX # UPPER WAS = 0
043924,000076: 21,2122 12110 TCF TSK
043925,000077:
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Page 999
Empty page
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End of include-file MYSUBS.agc. Parent file is MAIN.agc