This memo is in reply to PA/GA-M172, dated May 13, 1968, in which you requested that I evaluate action item No. 12 and submit recommendations for review and implementation. Specifically, the item was:…
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Spacecraft computer program P5—on the way out
During a meeting of MSC people at MIT on November 2, it was brought up by MIT that some problems were being encountered in the development of P05, the program which assists the astronaut in turning on the primary guidance system. Although these problems are relatively minor, it was the opinion of MIT that this…
Spacecraft computer program flow chart status
Just a note to you oats who are interested in flow charts for the spacecraft computer programs. MIT has had a small group headed by John ?enize who have done what appears to be an excellent job of establishing standards to be followed in the development of flow charts. A group of SDC people have…
About frequency of LM radar observations
I learned something the other day about how the LM computer uses rendezvous radar data that is different than I thought. It had been my understanding, and I think most other people’s too, that rendezvous radar observations were obtained and processed by the computer every 60 seconds. In fact, there has been some concern that…
Urgent recommendation that CMC steering of the S-IVB be deleted
MSC and MSFC are currently operating in accordance with Headquarter’s Apollo Program Directive No. 2A, dated September 1, 1966, which established the requirement for the command module computer (CMC) to be capable of guiding the S-IVB during the translunar insertion maneuver (TLI). The purpose of this memorandum is to recommend that action be taken to…
Results of the Apollo Spacecraft Software Configuration Control Board meeting of April 9
This memorandum briefly summarizes the results of the subject meeting. For detail, I would suggest you contact the ?????????????????????? specific program change request you are interested in. You will note that PCR activity doesn’t seem to be slacking off any….
Inflight loading of the spacecraft computer erasable memory
On August 25 we had a little meeting of Flight Control and Flight Software people to discuss adding a program in the RTCC to reload the spacecraft computer erasable memory in flight. This might be necessary to do when the LM computer is powered up for the first time in each manned flight or in…
Service Module RCS propellant remaining calculations in the CMC
In response to your memo dated January 13, same subject as above, we requested the Guidance and Control Division to carry out a study into the possibility of adding a CMC routine to complete RCS propellant consumed. The results of this study are detailed in the attached memo. As you can see, they have concluded…
Cabbages and Kings
During an informal conversation with a couple of different guys, I have been asked if MPAD may have some suggestions in a couple of areas. I wouldn’t be surprised if we do, so I thought I would send this little note around to ask you….
Spacecraft computer program status – particularly Sundisk
I have been putting off writing this note because it is rather painful. To put it bluntly, the release of Sundisk–the interim earth orbit command module spacecraft computer program–has slipped rather badly. What makes it painful is that it’s not all together clear why it is slipping and we still haven’t found a good way…