Article View: comp.lang.modula2
Article #2629Re: Report on defect in M2 vs C (Was Modula-2, Modula-3, C or C++)
From: Steve O'Neill
Date: Tue, 17 Oct 1995 16:01
Date: Tue, 17 Oct 1995 16:01
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Actually, there are 4 identical GPCs in the voting set with a fifth independent backup computer. The software in the 4 primary computers is identical while the backup flight software in the 5th GPC is developed and tested independently of the primary flight software. I'm not sure of the exact reason for the even number of primary GPCs but many years ago I was part of a simulation that caused a 2-on-2 fight - the result was less than optimal to say the least. This was a very contrived scenario and safeguards are there to keep this from happening. Just as a reference, the Shuttle software is written in the HAL/S language which was developed by Intermetrics and, I believe, had some influence on the design of Ada. -- Steve O'Neill | "No,no,no, don't tug on that! Sanders, A Lockheed Martin Company | You never know what it might smoneill@sanders.lockheed.com | be attached to." (603) 885-8774 fax: (603) 885-4071| Buckaroo Banzai
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Path: arc1-ca.pugleaf.net!news.sanders.com!usenet From: Steve O'Neill <smoneill@mailgw.sanders.lockheed.com> Newsgroups: comp.lang.modula2,comp.lang.modula3,comp.lang.c,comp.lang.c++,comp.lang.ada Subject: Re: Report on defect in M2 vs C (Was Modula-2, Modula-3, C or C++) Date: 17 Oct 1995 16:01:39 GMT Organization: Sanders, A Lockheed Martin Company Message-ID: <460k14$1dk@news.sanders.lockheed.com> References: <44hcri$rsm@theopolis.orl.mmc.com> <45cj8d$red@ixnews3.ix.netcom.com> <dewar.813336138@schonberg> <45gghq$7m4@lastactionhero.rs.itd.umich.edu> <45gso4$205@fg70.rz.uni-karlsruhe.de> <EACHUS.95Oct12165542@spectre.mitre.org> <dewar.813784369@schonberg> NNTP-Posting-Host: p19119.sanders.lockheed.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit)