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 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,ac9405996d0dcb7f X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news3.google.com!news.glorb.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local1.nntp.dca.giganews.com!nntp.comcast.com!news.comcast.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 25 Nov 2004 14:15:47 -0600 From: David Botton Newsgroups: comp.lang.ada Date: Thu, 25 Nov 2004 15:15:46 -0500 Message-ID: <2004112515154616807%david@bottoncom> References: <20619edc.0411251028.3e249bf3@posting.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: Would You Fly an Airplane with a Linux-Based Control System? User-Agent: Unison/1.5.2 NNTP-Posting-Host: 66.176.74.83 X-Trace: sv3-rZJElUDa1605RomwCHxbncl1kZ8r7j4p45nXTXyqB5X5Xs2HVrniis1N7BB8DS52YvwXNCJBn/eYZma!y+l7kzpCVNxfsmgR6upgCsMXanctcliVOlB20bG4EYmo9NBRYa//VPqV/ryQQg== X-Complaints-To: abuse@comcast.net X-DMCA-Complaints-To: dmca@comcast.net X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.20 Xref: g2news1.google.com comp.lang.ada:6478 Date: 2004-11-25T15:15:46-05:00 List-Id: Can you modify the text of the FAQ and send me the new version. Thanks, David Botton On 2004-11-25 13:28:24 -0500, snarflemike@yahoo.com (Mike Silva) said: > David Botton wrote in message > news:<2004112218292016807%david@bottoncom>... >> For a real understanding of the Ariane 5 event, see the Ada FAQ: >> >> http://www.adapower.com/index.php?Command=Class&ClassID=FAQ&CID=328 > > A small but, I think, important correction. The hardware at the > center of the failure was apparently built around the Motorola > 68020/68881 chips, not the MIL-STD-1750. The "Operand Error" that > triggered the failure is a hardware exception generated by the FPU > when, among other conditions, a float-to-integer conversion exceeds > the capacity of the integer, exactly as occurred. The reason this is > important is because it shows that the exception was not generated by > the Ada compiler code but by the hardware, and would therefore have > occurred regardless of the programming language used. If that's the > case then the "it wouldn't have exploded if it were written in C" > argument evaporates, unless they want to argue that the exception > handler behavior would have been specified differently if the > implementation language was C -- not likely!