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Virtual AGC Project
by Don Eyles
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Investigates whether it is possible (in Apollo 16) to compensate for low thrust during a lunar landing by redesignating the landing site using noun 69.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by Don Eyles
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eye 32
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Replacement for the erasable-memory program given in LUMINARY Memo 235 (rev 1), which was intended to allow an auto-pilot controlled lunar landing  in spite of failed CDUX.   Regarding the numbering of this memo, it identifies itself as LUMINARY Memo #339, but that is certainly not a correct number.  On the basis of the dating, and the LUMINARY Memos not known to have survived, it could be #237-238, 241-243, or 245-246, with #241-243 being the most likely in terms of the dating, though #238...
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by Don Eyles
texts
eye 66
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Describes various VERB/NOUN commands used during a lunar landing.  This document was apparently targeted for Apollo 12.
Topics: nasa, guidance, apollo, LM
Virtual AGC Project
by H. McOuat
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eye 39
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Mentions that the then-existing sun-moon ephemeris data, which was only valid for one-year epochs, had only been generated for the epochs 1966-67, 1967-68, ... , and 1969-70 up to that point.  The memo provides the data for epochs 1970-71 and 1971-72.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
texts
eye 29
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Describes, I believe, a new simulation feature available for LUMINARY 81 and beyond, that generates dumps of various digital-autopilot state information.
Topics: nasa, apollo, guidance, software, luminary, simulation
Virtual AGC Project
by Bruce McCoy
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eye 49
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Summary of changes from LUMINARY 1C (Apollo 13) to 1D (Apollo 14), the latter of which having just been released for manufacture.  (However, it was LUMINARY 163 at that point, whereas LUMINARY 178 eventually flew, so there were still quite a few changes to come.)
Topics: nasa, apollo, guidance, software, luminary
Relates concerns received from Grumman about "excessive" N49's.
Topics: nasa, guidance, apollo, LM
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 2
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Part 2/2 of the Apollo G&N System engineering drawings from aperture-card box 469 stored at the National Archives Southwest branch in Fort Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by Dana Densmore
texts
eye 57
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Describes the AGC software changes incorporated into LUMINARY revisions 117-120.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
texts
eye 20
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"Tindallgram" covering a number of interesting spacecraft computer things that came up at the July 10, 1970, Software Control Board meeting.
Topics: nasa, apollo, guidance, software, AGC
Note : A higher-quality scan of this document can be found in the Apollo Guidance & Navigation Engineering Drawings (Box 434) . This is Apollo Program document ND-1002324, providing instructions for checking out Apollo Command Module guidance&navigation system, using the Apollo Guidance Computer (AGC).
Topics: nasa, apollo, guidance, computer
Virtual AGC Project
by Don Eyles
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eye 23
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Latest version of EMP (erasable memory program) 103B, for CDU backup.
Topics: nasa, apollo, guidance, software, AGC, LM
Discusses very late acquisition in Apollo 14, just about 1 minute prior to a mandatory abort descision.
Topics: nasa, apollo, guidance, AGC, LM
Virtual AGC Project
by Peter Volante and V. Dunbar
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eye 47
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An update to Memo 133.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 43
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This is a scan of  part  of aperture-card box 465 at NARA SW, containing  MIT/IL engineering-drawing range 2014644-2015500   for the Project Apollo Command Module and Lunar Module guidance & navigation systems. This is part 2 (of 2) of the box, containing the final 1745 cards, beginning part way through the set of scans for drawing 2014648.
Topics: nasa, apollo, guidance
Virtual AGC Project
by North American Aviation
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eye 84
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This is a North American Aviation document describing the electrical interfaces between the Apollo Guidance Computer and the Command Module.  Both revisions "-" and "A" are presented. This document was scanned from aperture cards at NARA Southwest, but due to time and money pressures, a cheap flatbed scanner was used in place of NARA's equipment.  As a result, although the aperture cards are of relatively high quality, the scanned images are sometimes poor, with some...
Topics: nasa, apollo, guidance, computer
Virtual AGC Project
texts
eye 32
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Describes a less-extendable but lower word-count implementation of a logarithm function for LUMINARY.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 4
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Part 2/2 of the Apollo G&N System engineering drawings from aperture-card box 476, stored at the National Archives Southwest branch in Fort Worth, Texas. This batch contains Job Description Cards (JDC's), primarily of test procedures for G&N system components.
Topics: nasa, apollo, guidance
Virtual AGC Project
by Grumman Aerospace Engineering Corporation
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eye 2
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These are Grumman "interface revision notices" for the Apollo Guidance & Navigation System of the Apollo Lunar Module.  The come from aperture-card box 472 stored at the National Archives Southwest branch in Fort Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 38
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These are the notes from the AGC Software Control Board meeting, #42, held between the MIT IL and MSC on November 5, 1970.
Topics: apollo, nasa, guidance, software
Virtual AGC Project
by Bruce McCoy
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eye 38
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I believe, describes the workaround for the P22 anomaly described in the immediately-preceding memo, #108, with more specificity.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
texts
eye 33
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Describes certain problems which can occur if a response is made to V99 or V97 displays are made whilst in the burn program, in LUMINARY 69.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
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eye 22
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An after-the-fact report three uses the "LM hybrid facility" for real-time support of Apollo 14.  (One of the uses related to the famous erroneous-abort fix.)
Topics: nasa, guidance, apollo, LM
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 3
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Part 2/2 of the Apollo G&N System engineering drawings from aperture-card box 475 stored at the National Archives Southwest branch in Fort Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by Allan Klumpp
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eye 21
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Describes the expected appearance of the new real-time TLOSS monitoring/plotting facility for the Apollo 13 descent.
Topics: nasa, guidance, apollo, LM
Virtual AGC Project
by Allan Klumpp
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eye 57
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Describes a change to the P66 (lunar landing) program algorithm in LUMINARY 131 that provides automatic nulling of horizontal translation.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by Don Eyles
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eye 40
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Describes an experimental change to the algorithm for reading the PIPAs (accelerometers).
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by MIT Instrumentation Lab
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eye 40
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Note : A much superior scan of this same microfilm is now available . This is Apollo Program document ND-1002323, revs J through S.  It relates to checkout of the Apollo spacecraft Guidance & Navigation system using an Apollo Guidance Computer loaded with the AURORA 88 program.
Topics: nasa, apollo, guidance
Virtual AGC Project
by Phyllis Rye and and P. Peck
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eye 31
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Lists account numbers for performing various actions on a number of different variations of the LUMINARY and COLOSSUS programs.  This is interesting in that other than LUMINARY, ZERLINA, COMANCHE, and ARTEMIS, all of these programs are generally of  unknown purpose and authorship today.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by D. G. Hoag
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eye 17
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Apollo 9 mission summary.
Topics: nasa, apollo, guidance
A pair of memos by TRW's John Norton, itemizing software costs and technically questionable details in implementing the Variable Servicer Program for Apollo 14.
Topics: nasa, apollo, guidance, software, AGC, LM
Virtual AGC Project
by MIT Instrumentation Lab
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eye 199
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This is part of a collection of MIT/IL Apollo Guidance Computer mechanical and electrical drawings, scanned from "aperture cards" (microfilm) held by the U.S. National Archives and Records Administration. See also the  other  batches of aperture cards, and the  index of the individual drawings in these uploads  at the Virtual AGC Project website.
Topics: nasa, apollo, guidance, computer
Virtual AGC Project
by Don Eyles
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eye 62
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Describes an advantage of the Variable Guidance algorithm being experimented with in the off-line program ZERLINA.  This particular advantage is purely for the IBM 360 computer simulating a run of ZERLINA, and not for any purported usage in the LM, in that it requires less 360 CPU time than the regular task-scheduling algorithm in LUMINARY.
Topics: nasa, apollo, guidance, software, luminary, simulation
Virtual AGC Project
by R. A. Larson
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eye 32
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Update of Apollo 14 (Luminary 1D) program notes for Luminary 1E (Apollo 15-17).
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by Bruce McCoy
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eye 33
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Describes the AGC software changes incorporated into LUMINARY revision 107.
Topics: nasa, apollo, guidance, software, luminary
This is a continuation of LUMINARY Memo #230, extending the discussion to landing sites not at the equator.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by D. Densmore
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eye 51
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Description of the software changes for LUMINARY 196.  The memo dates itself (incorrectly) as January 5, 1970, whereas in fact it was from 1971.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
texts
eye 20
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A report by astronaut Fred Haise on three alternative approaches to handling abort conditions, accompanied by a healthy dosage of whimsicality.
Topics: nasa, apollo, guidance, LM
Virtual AGC Project
by Don Eyles
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eye 15
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Apparently, a programming trick (and challenge) by Don Eyles to reduce the number of words needed to set up an AGC "waitlist" task.
Topics: nasa, guidance, apollo, AGC
The purpose of this internal MSC note is to describe the logic used to compute the lift-off time required for the early rendezvous profile used on Apollo 14 (Mission H-3). 
Topics: nasa, apollo, guidance, software
Virtual AGC Project
texts
eye 180
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This is part of a collection of MIT/IL Apollo Guidance Computer mechanical and electrical drawings, scanned from "aperture cards" (microfilm) held by the U.S. National Archives and Records Administration. See also the  other  batches of aperture cards, and the  index of the individual drawings in these uploads  at the Virtual AGC Project website.
Topics: nasa, apollo, guidance, computer
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 5
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Part 2/2 of the Apollo G&N engineering drawings from aperture-card box 472 stored at the National Archives Southwest branch in Fort Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 11
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Contains approximately the initial 60% of the engineering drawings from aperture card box 441 stored at the National Archives Southwest in Ft. Worth, Texas.  These are all drawings of the Apollo Guidance & Navigation System.  The remaining 40% will comprise a separate posting.
Topics: nasa, apollo, guidance
Virtual AGC Project
texts
eye 27
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Describes certain tests of the attitude error.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by Philip G. Felleman
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eye 21
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In spite of the title of this document --- the report is really just that Apollo 17 was an "essentially fault-free flight" --- this is really more of a nostalgic look back at things that had gone wrong in earlier missions which the author refers to as "stuck PIPA", "1300 restarts", "travelling trunnion", and so forth.
Topics: nasa, apollo, guidance
Virtual AGC Project
by M. Albert
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eye 38
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Describes, I believe, a new simulation feature, in which RTCC-compatible (Real-Time Control Center in Houston) uplink data can be generated during the simulation.
Topics: nasa, apollo, guidance, software, luminary, simulating
Virtual AGC Project
by Dana Densmore
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eye 43
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Describes the AGC software changes incorporated into LUMINARY revisions 144-147
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by NASA MSC, Mission Planning and Analysis Division
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eye 334
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This is a pseudo-code description of the Artemis 72 AGC Command Module software used in Apollo 15-17.  It is intended, as the document itself says in its Abstract, "that it be used together with a symbolic tabulation of the program".
Topics: nasa, apollo, guidance, software
Discusses LUMINARY testing schedule.
Topics: nasa, apollo, guidance, software, luminary, testing
Virtual AGC Project
texts
eye 25
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Supercedes the code (though not the descriptive material) provided in LUMINARY Memos #216 and #219.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by Don Eyles
texts
eye 34
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Describes inability of the master ignition routine to recover from certain external failure conditions, and the need for a software workaround for that problem.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by MIT Instrumentation Lab
texts
eye 365
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This is part of a collection of MIT/IL Apollo Guidance Computer mechanical and electrical drawings, scanned from "aperture cards" (microfilm) held by the U.S. National Archives and Records Administration. See also the  other  batches of aperture cards, and the  index of the individual drawings in these uploads  at the Virtual AGC Project website.
Topics: nasa, apollo, guidance, computer
Virtual AGC Project
texts
eye 32
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Report on simulation of delayed tip-over of the LM during descent, which could happen because of the addition of an abort-override in LUMINARY.
Topics: nasa, apollo, guidance, software, simulation
Virtual AGC Project
by D. Densmore
texts
eye 29
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Describes the software changes in LUMINARY 182.
Topics: nasa, apollo, guidance, software
A correction ("Change 3") to NASA document 69-FM-326.
Topics: nasa, apollo, guidance
Virtual AGC Project
by Don Eyles
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eye 32
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Describes an erasable-memory program used in conjunction with P47, which could be used to monitor the ascent burn in case targeting with P12 was impossible and it was "urgently necessary to get off the moon".
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by Don Eyles
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eye 21
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Analysis of a "throttle pulse-out" experienced during an Apollo 15 landing test.  The explanation given is that the steep slope near Hadley Rille, combined with a range error, caused a very large error in altitude vs the software's terrain model.  It is concluded, however, that "there is no reason to expect one in flight".
Topics: nasa, apollo, guidance, software, AGC, LM
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 149
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This is a scan of approximately the final 2/3 of aperture-card box 467 at NARA SW.  It contains engineering drawings for the Apollo Lunar Module and Command Modules' Guidance&Navigation system.
Topics: nasa, apollo, guidance
Virtual AGC Project
by Larry W. Strimple
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eye 18
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Discusses mutually-inconsistent procedures for ignition whilst on the lunar surface.
Topics: nasa, apollo, guidance, LM
Virtual AGC Project
by Don Eyles
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eye 49
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Describes the current state and planned future work on the off-line experimental development program ZERLINA.
Topics: nasa, apollo, guidance, software, luminary, simulation
Virtual AGC Project
texts
eye 37
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This is a follow-up to memo #89, which gives information about the problem of lost downrupts (downlink interrupts).  In the present memo, an argument is made that this is not an AGC software problem at all, but rather a problem of the computer being overloaded during simulations in which the lost downrupts are seen.  In other words, the problem would not be seen in a mission, but only in a simulation.
Topics: nasa, apollo, guidance, software, luminary, simulation
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 2,557
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Apollo Guidance Computer Command Module software for Apollo 11 mission.
Topics: nasa, apollo, guidance, software, colossus
Virtual AGC Project
by MIT Instrumentation Lab
texts
eye 318
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MIT/IL engineering drawings for the Block II DSKY (Apollo).
Topics: nasa, apollo, guidance, computer
Virtual AGC Project
texts
eye 27
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A continuation of document 67-FM-56 ("AS-503A Requirements for the RTCC:  Return-to-Earth Abort Conic Subprocessor"), which completes the logic specification, corrects errors, and adds changes.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by GEMINI Systems Engineering Staff
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eye 101
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Report on preliminary studies on the simulation of GEMINI ascent guidance.
Topics: nasa, gemini, guidance, simulation
Describes a setup for simulating LM RR in the lab.
Topics: nasa, apollo, LM, AGC
Virtual AGC Project
texts
eye 26
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Describes testing of the capability in LUMINARY 1E for the AGC to continue to attempt to control attitude and steering even if the AGC is supposedly in control.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
texts
eye 25
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Grumman analysis that the stability of the rate-of-descent control system can be optimized by properly matching the LGC programmed gain constants to the system time delays.
Topics: nasa, apollo, guidance, software, AGC, LM
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 2
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comment 0
Part 2/2 of the Apollo G&N System engineering drawings from aperture-card box 468 stored at the National Archives Southwest branch in Fort Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by MIT Instrumentation Laboratory
texts
eye 4
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comment 0
Part 1/2 of the Apollo G&N System engineering drawings stored in aperture-card box 472 at the National Archives Southwest branch in Forth Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 14
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Part 1/2 of the Apollo G&N System engineering drawings from aperture-card box 451 stored at the National Archives Southwest branch in Fort Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by MIT Instrumentation Laboratory
texts
eye 1,750
favorite 6
comment 0
A collection of electrical schematics, mechanical drawings, and other drawings for Block II AGC models 2003100 and 2003200 and their associated DSKY models. This imagery comes from 8.5"×11" photocopies of what were originally much larger drawings in some cases.  The photocopies were then stored in a binder for 50 years before finally being digitized.  The quality has therefore been compromised not only by the size reduction of the originals, but also by the long storage time.  In...
Topics: nasa, agc, guidance, schematics, mechanical
Virtual AGC Project
by Grumman Aircraft Engineering Corporation
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eye 2
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These are Grumman engineering drawings of the Apollo Lunar Module from aperture-card box 504 stored at the National Archives Southwest branch in Fort Worth, Texas.
Topics: nasa, apollo, lem
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 7
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Part 2/2 of the Apollo G&N System engineering drawings from aperture-card box 445 stored at the National Archives Southwest in Ft. Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by Craig W. Schulenberg
texts
eye 38
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Describes AGC software changes incorporated into revisions 93-96 of LUMINARY program.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by J. Connor
texts
eye 29
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Describes a way (in LUMINARY simulations) of printing certain data from the R65 routine (Preferred Tracking Attitude).
Topics: nasa, apollo, guidance, software, luminary, simulation
Virtual AGC Project
texts
eye 45
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Describes recent significant changes (for Apollo 11) in the descent and ascent abort programs, P70 and P71.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 6
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Part 1/2 of the Apollo G&N System engineering drawings from aperture-card box 469 stored at the National Archives Southwest branch in Fort Worth, Texas.
Topics: nasa, apollo, guidance
Virtual AGC Project
by Craig Schulenberg
texts
eye 33
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Describes AGC software changes leading to revisions 54-60 of LUMINARY program.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by Don Eyles
texts
eye 46
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This is a follow-on to LUMINARY Memo 115, describing how to patch the Delta-Guidance algorithm into LUMINARY 130, summarizing the various discoveries made in using the algorithm in the branch program AMELIA, and so on.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by Don Eyles
texts
eye 16
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(Group 23B Internal Memo #69) Discussion of new GENTRAN routine.
Topics: nasa, guidance, apollo, AGC
Virtual AGC Project
by James C. Pennypacker
texts
eye 87
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Describes a method of transforming coordinates from the vehicle coordinate system of a spacecraft employing a gimballess inertial measurements system into the inertial coordinate system, using only whole-number computations, with specific application to the Apollo Guidance Computer.  The motivation for this is the desire to provide a gimballess inertial measurement unit as a kind of backup or alternate approach to the Apollo guidance & navigation system's gimballed IMU.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by Bruce J. McCoy
texts
eye 49
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This is a follow-up to memo #148.  Describes changes made to LUMINARY 1D (Apollo 14) after the supposed release (of LUMINARY 163) in memo #148, and proposes a new release date.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by MIT Instrumentation Laboratory
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eye 41
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These are the notes from the AGC Software Control Board meeting, #38, held between the MIT IL and MSC on May 17, 1970.
Topics: apollo, nasa, guidance, software
Virtual AGC Project
by Craig Schulenberg
texts
eye 29
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Describes AGC software changes incorporated into LUMINARY program revision 61.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
by Craig Work and Peter Weissman
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eye 31
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Report on digital autopilot tests in Apollo 14 testing.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by George M. Low
texts
eye 25
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Recommendations for improving procedure for creating crew procedures.
Topics: nasa, apollo
Virtual AGC Project
by Don Eyles
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eye 53
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Describes a change to the initialization of landing runs, which is supposed to take in effect in LUMINARY revisions 50 and later, due to the program-change request that is the subject of the immediately-preceding LUMINARY Memos, #44 and #43.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
texts
eye 60
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Describes a change to Apollo 10 Lunar Module software (LUMINARY 69 → rev. 2), namely implementation of the Boeing R-2 lunar gravity model.
Topics: nasa, apollo, guidance, software, luminary
Virtual AGC Project
texts
eye 30
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Describes the time limitations in Apollo ephemeris data.  Although the ephemeris data was regarded as valid for a 1-year interval, the memo concludes that it is really valid for 2-2.5 years.  There is an amusing misprint that (as a result) the Apollo 15-17 launches must occur before 17 February 1964 (should be 1974).
Topics: nasa, apollo, guidance, software
Virtual AGC Project
texts
eye 39
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Reports on testing of Apollo 15 digital autopilot performance.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
texts
eye 29
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Summarizes results from testing the DSKY keystroke-backup erasable-memory program given in LUMINARY Memo #224, assuming failure of the DSKY ENTER key.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
by C. W. Braunhardt
texts
eye 38
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Describes guidelines allowing a 25% reduction in the time needed to create "Level 3" software verification plans.  This is also COLOSSUS Memo 52.
Topics: nasa, apollo, guidance, software, luminary, colossus
Virtual AGC Project
by James Kernan and Craig Schulenberg
texts
eye 41
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A synopsis of the LUMINARY "Level 4" test plan is given.
Topics: nasa, apollo, guidance, software, luminary, testing
Virtual AGC Project
texts
eye 27
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Explains that a recently-fixed problem with the AGC simulator's handling of overflow had actually existed since late 1966.
Topics: nasa, guidance, apollo
Virtual AGC Project
by James C. Stokes, Jr.
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eye 19
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Report of analysis on using a variable time base.
Topics: nasa, apollo, guidance, software, AGC
Virtual AGC Project
texts
eye 29
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A preliminary software-test plan for Apollo 17.
Topics: nasa, apollo, guidance, software
Virtual AGC Project
texts
eye 16
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Report of analysis of affect on simulation of AGC flight programs of the "CCS Q" bug (a bug in the digital simulator software).  The conclusion is that simulations of ARTEMIS, LUMINARY, and SKYLARK would not have been affected, because those programs were not able to trigger the simulator bug.
Topics: nasa, apollo, guidance, software, simulation, AGC
Virtual AGC Project
by MIT Instrumentation Lab
texts
eye 295
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comment 0
This is part of a collection of MIT/IL Apollo Guidance Computer mechanical and electrical drawings, scanned from "aperture cards" (microfilm) held by the U.S. National Archives and Records Administration. This batch consists almost entirely of Block I AGC/DSKY mechanical and electrical drawings. See also the  other  batches of aperture cards, and the  index of the individual drawings in these uploads  at the Virtual AGC Project website.
Topics: nasa, apollo, guidance, computer
Virtual AGC Project
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Description of the software changes in LUMINARY 197 through 199.  The memo is incorrectly dated 8 January 1970, whereas it was really 1971.
Topics: nasa, apollo, guidance, software