Source Code
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These source-code files are part of a reconstructed copy of Skylark 048, the
Block II Command Module (CM) Apollo Guidance Computer (AGC) software for the
Skylab-2, Skylab-3, Skylab-4, and Apollo-Soyuz Test Project missions.
They have been created via disassembly of binary dumps of the original core rope
memory modules actually flown on Skylab-2, part numbers 2010802-541, 2010802-551,
2010802-561, 2010802-571, 2010802-581, and 2010802-591. Access to these modules
was provided by the New Mexico Museum of Space History, who we are much indebted to.
The source code for the Apollo 15, 16, and 17 software, Artemis 072, was used as
a starting point. Heavy use was made of TRW 4900.5-244, Programmed Guidance Equations
for Skylark Command Module Earth Orbital Program, dated 14 February 1972. This document
contains pseudocode of essentially all of Skylark, using original program labels which
have been copied for this source reconstruction.
Since only binary dumps (rather than listings) of Skylark are available as source material,
all comments and labels are approximate.
They have been taken from the Programmed Guidance Equations or 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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001419,000002: ## Copyright: Public domain.
001420,000003: ## Filename: SUBROUTINE_CALLS.agc
001421,000004: ## Purpose: A section of Skylark revision 048.
001422,000005: ## It is part of the source code for the Apollo Guidance Computer (AGC)
001423,000006: ## for Skylab-2, Skylab-3, Skylab-4, and ASTP. No original listings of
001424,000007: ## this software are available; instead, this file was created via
001425,000008: ## disassembly of dumps of the core rope modules actually flown on
001426,000009: ## Skylab-2. Access to these modules was provided by the New Mexico
001427,000010: ## Museum of Space History.
001428,000011: ## Assembler: yaYUL
001429,000012: ## Contact: Ron Burkey <info@sandroid.org>.
001430,000013: ## Website: www.ibiblio.org/apollo/index.html
001431,000014: ## Mod history: 2023-09-04 MAS Created from Artemis 072.
001432,000015: ## 2024-03-05 MAS Added note for Skylark.
001433,000016:
001434,000017:
001435,000018: ## The subroutine names and revision numbers shown in the table below
001436,000019: ## correspond to Artemis 72. Unfortunately, we don't know the subroutine
001437,000020: ## names, much less their revisions, for Skylark, so the Artemis values
001438,000021: ## have been left unchanged for now.
001439,000022:
001440,000023: ??????? SUBRO ERASTOTL 041
001441,000024: ??????? SUBRO DIOGENES 064
001442,000025: ??????? SUBRO MEDUSA 035
001443,000026: ??????? SUBRO MENLAUS 061
001444,000027: ??????? SUBRO ULYSSES 029
001445,000028: ??????? SUBRO ZEUS 046
001446,000029:
End of include-file SUBROUTINE_CALLS.agc. Parent file is MAIN.agc