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=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,f039470e8f537101 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-07-21 19:22:29 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!cyclone.bc.net!snoopy.risq.qc.ca!chi1.webusenet.com!news.webusenet.com!cyclone1.gnilink.net!spamkiller2.gnilink.net!nwrdny02.gnilink.net.POSTED!53ab2750!not-for-mail From: Hyman Rosen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5a) Gecko/20030708 Thunderbird/0.1a X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Ariane5 FAQ References: <1058799152.775376@master.nyc.kbcfp.com> <1058810510.375902@master.nyc.kbcfp.com> <3f1c374f$0$11375$cc9e4d1f@news.dial.pipex.com> In-Reply-To: <3f1c374f$0$11375$cc9e4d1f@news.dial.pipex.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Message-ID: Date: Tue, 22 Jul 2003 02:22:28 GMT NNTP-Posting-Host: 162.83.157.195 X-Complaints-To: abuse@verizon.net X-Trace: nwrdny02.gnilink.net 1058840548 162.83.157.195 (Mon, 21 Jul 2003 22:22:28 EDT) NNTP-Posting-Date: Mon, 21 Jul 2003 22:22:28 EDT Xref: archiver1.google.com comp.lang.ada:40601 Date: 2003-07-22T02:22:28+00:00 List-Id: Francisco Malpartida wrote: > - The on-board SW detects that one of the accelerometers is out of range In much the same sense that your car detects that it's on the railroad tracks when the train hits it. The Ariane 4 code had a deliberately unprotected conversion from floating point to 16-bit integer, under the assumption that overflow could not happen. When the overflow did happen, the computer generated an Operand Fault.