From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,fb1663c3ca80b502 X-Google-Attributes: gid103376,public X-Google-Thread: fac41,e01bd86884246855 X-Google-Attributes: gidfac41,public From: "Marin D. Condic" Subject: Re: Interresting thread in comp.lang.eiffel Date: 2000/07/13 Message-ID: <396E2E35.88FE32B8@acm.com>#1/1 X-Deja-AN: 646062254 Content-Transfer-Encoding: 7bit References: <8ipvnj$inc$1@wanadoo.fr> <8j67p8$afd$1@nnrp1.deja.com> <395886DA.CCE008D2@deepthought.com.au> <3958B07B.18A5BB8C@acm.com> <395A0ECA.940560D1@acm.com> <8jd4bb$na7$1@toralf.uib.no> <8jfabb$1d8$1@nnrp1.deja.com> <8jhq0m$30u5$1@toralf.uib.no> <8jt4j7$19hpk$1@ID-9852.news.cis.dfn.de> <3963CDDE.3E8FB644@earthlink.net> <8k5alv$1oogm$1@ID-9852.news.cis.dfn.de> <8kl25k$2q7k0$1@ID-9852.news.cis.dfn.de> Organization: Quadrus Corporation X-Sender: "Marin D. Condic" (Unverified) X-Server-Date: 13 Jul 2000 21:01:50 GMT Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 Newsgroups: comp.lang.ada,comp.lang.eiffel Date: 2000-07-13T21:01:50+00:00 List-Id: Joachim Durchholz wrote: > The IRS is a piece of hardware from the point of view of the main > controlling software of the Ariane, right? > No. The IRS was a pair of MilStd1750a computers that received inputs from sensors along hardware interfaces. The software in question was running on both computers. When the software encountered the fault in question, its behavior was to shut down and transfer control to the other channel. Because both computers were running identical software, they both shut down. The IRS was being viewed as an "off the shelf" part, similar to how you might view an electronic fuel injection computer purchased for your car. An analogy would be if you took an EFI computer built for a Dodge Neon and mounted it in a Mack truck without ever testing it in the Mack truck application to see if it would work. MDC -- ====================================================================== Marin David Condic - Quadrus Corporation - http://www.quadruscorp.com/ Send Replies To: m c o n d i c @ q u a d r u s c o r p . c o m Visit my web site at: http://www.mcondic.com/ "Some people think programming Windows is like nailing jello to the ceiling... easy with the right kind of nails." -- Ivor Horton - Beginning Visual C++ 6 ======================================================================