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Virtual AGC — AGS — LVDC — Gemini

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Apollo and Gemini Computing Systems

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Physical Implementations

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Here you'll find a collection of all the AGC, AGS, LVDC, and Gemini spacecraft computer documentation and software that I've managed to find whilst working on  Virtual AGC.  Every document on this page is archived here at Virtual AGC, regardless of whether it originated here or not.  In the early days I used to include only material I uncovered by my own efforts, but there have increasingly been contributions by readers, including some of the original AGC developers.  And there's material here that has been duplicated from other Apollo-centric websites for your convenience; see the FAQ page for a list of the fine Apollo and Gemini websites I raided. Now, there is some value-added in this process, since I add searchable text to those PDFs which are image-only, as well as adding metadata and bookmark panes where they don't exist.  My intention is to eventually provide one-stop-shopping for all of your Apollo and Gemini computing-system documentation needs. Note however, that I choose to duplicate only scanned or photographic images of the original documents.  In other words, I provide something as close to the "real thing" as I can.  On some sites, notably the Apollo Flight Journal and Apollo Lunar Surface Journal, great pains have been taken to produce HTML forms of the documents.  I do not duplicate those improved reformulations here, because that's original work for which I think credit is due; so you will have to visit those sites to use those improved versions.

Document categories

 AGC software manuals and listings

Guidance System Operations Plans (GSOP)

AGC quick-reference cards or data cards

AGC pad loads

Space Guidance Analysis (SGA) memos

If you are interested in the mathematical underpinnings of the AGC software, then this amazing series of memos from MIT's Instrumentation Lab is the place to look.  The memos are in roughly chronological order.  It is very interesting to reflect on the fact that these mathematical memos are often written by the very same people whose names you find as authors in the software.  The AGC software was written in a time ... or at least a place ... where software was regarded as the expression of mathematical knowledge as opposed to being a mere exercise in the expert employment of programming languages and tools as it is today.  It is interesting also to reflect on the nature of the software this approach produced.

Apollo Experience Reports

Miscellaneous Guidance & Navigation

These items are alphabetical by author.  (Where the "author" is an organization rather than a person, I consider the author to be "Anonymous".)  These items are mostly documents are from our (improved) archive of the now sadly defunct AGC website of MIT's Dibner Institute for the History of Recent Science and Technology.  (Yes, there is some duplication here, but otherwise it becomes all too easy to lose documents because they're smeared across multiple web-pages.)

Abort Guidance System (AGS) and its computer (AEA)

As inadequate as our AGC documentation collection is, our AGS documentation collection lags far behind.  All of the available documentation was digitized by John Pultorak from physical documents preserved and donated by Davis Peticolas.

Launch Vehicle Digital Computer (LVDC)

We have precious little LVDC documentation of any kind, and no LVDC software at all.  The Wikipedia article on the LVDC laments that all of the LVDC software has probably vanished and does not exist any longer.  Well, I don't believe that.  (They're smart enough to send a man to the moon, but too stupid to put the documents in a file cabinet afterward?  I hope not!)  There must be some former LVDC developer somewhere who was proud enough of his work to retain some souvenirs.  If you know any LVDC developers, please help us to get in contact with them.

Systems Handbooks

Operations Handbooks

Operational Data Books

Technical Crew Debriefings

Mission Reports

Flight Plans


Familiarization Manuals

General Apollo documents unrelated to computing systems

Press Kits and Releases


Gemini spacecraft computer

Last modified by Ronald Burkey on 2010-09-05.

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