Source Code
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These source-code files are part of a reconstructed copy of Comanche 45/2 (AKA Manche45 revision 2),
the final, flown mission release of the Apollo 10 Command Module (CM) Apollo Guidance
Computer (AGC) software. Comanche 45/2 was preceded by Comanche 44 and Comanche 45. The
reconstruction is believed to be exactly accurate, but in the absence of an actual Apollo-era
listing of Comanche 45/2, some explanation of the reconstruction process is needed
to insure confidence in that accuracy.
The starting point was the source code of Comanche 45 (itself previously accurately
reconstructed). Comanche 45 source code was then modified by incorporating changes
known from contemporary documentation to have been made between revisions 45 and 45/2.
The now-reconstructed Comanche 45/2 source code was
verified by assembling it and checking that the assembled code had
the expected known-correct memory-bank checksums.
Note that page numbers in the reconstructed code tend to match those in the Comanche 55, the
most-similar revision of Comanche for which we have access to an actual non-reconstructed hardcopy;
the source code would likely have different page numbers in a contemporary
Comanche 45 listing.
Annotations that were not present in the contemporary source code have been added to the reconstructed
code to justify each change relative to Comanche 44. Here's a guide to the Apollo documentation referenced
in those annotations:
Comments expected to have been present in 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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051322,000002: ## Copyright: Public domain.
051323,000003: ## Filename: SINGLE_PRECISION_SUBROUTINES.agc
051324,000004: ## Purpose: A section of Manche45 revision 2.
051325,000005: ## It is part of the reconstructed source code for the
051326,000006: ## final, flown release of the flight software for the Command
051327,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 10.
051328,000008: ## The code has been recreated from a copy of Comanche 055. It
051329,000009: ## has been adapted such that the resulting bugger words
051330,000010: ## exactly match those specified for Manche 45/2 in NASA drawing
051331,000011: ## 2021153D, which gives relatively high confidence that the
051332,000012: ## reconstruction is correct.
051333,000013: ## Assembler: yaYUL
051334,000014: ## Contact: Ron Burkey <info@sandroid.org>.
051335,000015: ## Website: www.ibiblio.org/apollo/index.html
051336,000016: ## Mod history: 2020-12-24 MAS Created from Comanche 45.
051337,000017:
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Page 1207
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051339,000019: 5074 BLOCK 02
051340,000020:
051341,000021: # SINGLE PRECISION SINE AND COSINE
051342,000022:
051343,000023: 5074 COUNT 02/INTER
051344,000024:
051345,000025: 5074 65002 SPCOS AD HALF # ARGUMENTS SCALED AT PI
051346,000026: 5075 55075 SPSIN TS TEMK
051347,000027: 5076 15100 TCF SPT
051348,000028: 5077 41075 CS TEMK
051349,000029: 5100 60000 SPT DOUBLE
051350,000030: 5101 55075 TS TEMK
051351,000031: 5102 15113 TCF POLLEY
051352,000032: 5103 57075 XCH TEMK
051353,000033: 5104 51075 INDEX TEMK
051354,000034: 5105 65000 AD LIMITS
051355,000035: 5106 40000 COM
051356,000036: 5107 61075 AD TEMK
051357,000037: 5110 55075 TS TEMK
051358,000038: 5111 15113 TCF POLLEY
051359,000039: 5112 15131 TCF ARG90
051360,000040: 5113 00006 POLLEY EXTEND
051361,000041: 5114 71075 MP TEMK
051362,000042: 5115 55076 TS SQ
051363,000043: 5116 00006 EXTEND
051364,000044: 5117 75047 MP C5/2
051365,000045: 5120 67706 AD C3/2
051366,000046: 5121 00006 EXTEND
051367,000047: 5122 71076 MP SQ
051368,000048: 5123 67666 AD C1/2
051369,000049: 5124 00006 EXTEND
051370,000050: 5125 71075 MP TEMK
051371,000051: 5126 20001 DDOUBL
051372,000052: 5127 55075 TS TEMK
051373,000053: 5130 00002 TC Q
051374,000054: 5131 50000 ARG90 INDEX A
051375,000055: 5132 45000 CS LIMITS
051376,000056: 5133 00002 TC Q # RESULT SCALED AT 1
051377,000057:
051378,000058: # SPROOT WAS DELETED IN REV 51 OF MASTER. ASS. CONT. HAS CARDS.
051379,000059:
051380,000060:
051381,000061:
051382,000062:
End of include-file SINGLE_PRECISION_SUBROUTINES.agc. Parent file is MAIN.agc