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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051247,000002: ## Copyright: Public domain.
051248,000003: ## Filename: INTERPRETIVE_CONSTANTS.agc
051249,000004: ## Purpose: A section of Manche45 revision 2.
051250,000005: ## It is part of the reconstructed source code for the
051251,000006: ## final, flown release of the flight software for the Command
051252,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 10.
051253,000008: ## The code has been recreated from a copy of Comanche 055. It
051254,000009: ## has been adapted such that the resulting bugger words
051255,000010: ## exactly match those specified for Manche 45/2 in NASA drawing
051256,000011: ## 2021153D, which gives relatively high confidence that the
051257,000012: ## reconstruction is correct.
051258,000013: ## Assembler: yaYUL
051259,000014: ## Contact: Ron Burkey <info@sandroid.org>.
051260,000015: ## Website: www.ibiblio.org/apollo/index.html
051261,000016: ## Mod history: 2020-12-24 MAS Created from Comanche 45.
051262,000017:
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Page 1205
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051264,000019: 26,2000 SETLOC INTPRET1
051265,000020: 26,2000 BANK
051266,000021:
051267,000022: 26,3324 COUNT 23/ICONS
051268,000023:
051269,000024: 26,3324 10000 00000 DP1/4TH 2DEC .25
051270,000025:
051271,000026: 26,3326 00000 00000 UNITZ 2DEC 0 B-28
051272,000027:
051273,000028: 26,3330 00000 00000 UNITY 2DEC 0 B-28
051274,000029:
051275,000030: 26,3332 20000 00000 UNITX 2DEC .5
051276,000031:
051277,000032: 26,3334 00000 00000 ZEROVECS 2DEC 0 B-28
051278,000033:
051279,000034: 26,3336 00000 00000 2DEC 0 B-28
051280,000035:
051281,000036: 26,3340 00000 00000 2DEC 0 B-28
051282,000037:
051283,000038: 26,3342 26,3332 DPHALF = UNITX
051284,000039: 26,3342 37777 DPPOSMAX OCT 37777
051285,000040: 26,3343 37777 OCT 37777
051286,000041:
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Page 1206
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051288,000043: # INTERPRETIVE CONSTANTS IN THE OTHER HALF-MEMORY
051289,000044:
051290,000045: 04,2000 SETLOC INTPRET2
051291,000046: 04,2000 BANK
051292,000047:
051293,000048: 04,3554 COUNT 14/ICONS
051294,000049:
051295,000050: 04,3554 00000 00000 ZUNIT 2DEC 0 B-28
051296,000051:
051297,000052: 04,3556 00000 00000 YUNIT 2DEC 0 B-28
051298,000053:
051299,000054: 04,3560 20000 00000 XUNIT 2DEC .5
051300,000055:
051301,000056: 04,3562 00000 00000 ZEROVEC 2DEC 0 B-28
051302,000057:
051303,000058: 04,3564 00000 00000 2DEC 0 B-28
051304,000059:
051305,000060: 04,3566 00000 00000 2DEC 0 B-28
051306,000061:
051307,000062: 04,3570 77777 OCT 77777 # -0, -6, -12 MUST REMAIN IN THIS ORDER
051308,000063: 04,3571 77771 DEC-6 DEC -6 B-14
051309,000064: 04,3572 77763 DEC-12 DEC -12 B-14
051310,000065: 04,3573 37777 37777 LODPMAX 2OCT 3777737777 # THESE TWO CONSTANTS MUST REMAIN
051311,000066:
051312,000067: 04,3575 37777 37777 LODPMAX1 2OCT 3777737777 # ADJACENT AND THE SAME FOR INTEGRATION
051313,000068:
051314,000069: 04,3577 04,3562 ZERODP = ZEROVEC
051315,000070: 04,3577 04,3560 HALFDP = XUNIT
051316,000071:
051317,000072:
051318,000073:
051319,000074:
End of include-file INTERPRETIVE_CONSTANTS.agc. Parent file is MAIN.agc