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: f43e6,5ac12f5a60b1bfe X-Google-Attributes: gidf43e6,public X-Google-Thread: 101deb,f96f757d5586710a X-Google-Attributes: gid101deb,public X-Google-Thread: 103376,5ac12f5a60b1bfe X-Google-Attributes: gid103376,public From: john@assen.demon.co.uk (John McCabe) Subject: Re: Ariane 5 - not an exception? Date: 1996/08/06 Message-ID: <839354742.3667.0@assen.demon.co.uk>#1/1 X-Deja-AN: 172493057 x-nntp-posting-host: assen.demon.co.uk references: <4t9vdg$jfb@goanna.cs.rmit.edu.au> <4tiu6e$kpm@news2.cais.com> <4u5nau$77b@access1.digex.net> newsgroups: comp.software-eng,comp.lang.ada,comp.lang.pl1 Date: 1996-08-06T00:00:00+00:00 List-Id: nigel@access1.digex.net (Nigel Tzeng) wrote: <..snip..> >There are several space qual'd processors, including the 386. We >flew one on SAMPEX and will also fly them on XTE and TRMM. I think >the R3000 has also been flight qual'd for space (fairly sure there was >one on Clementine). IIRC the 68K has been on a getaway special >although when I last looked it had not ever been flight qual'd. Just a comment, but a US space qualified processor isn't necessarily ESA space qualified. Apparently true ESA qualification requires more extensive testing than the US requirement. Seems a bit stupid to me personally but if ESA just accepted US space qualification testing and methods then there'd be quite a few of them out of a job. As a matter of interest, which 386 did you use? Was it the repackaged SEI one? <..snip..> >[snip] >> 4) Software Reuse >> >> If one intends to "reuse" software, such as Ariane 4xx software in >> Ariane 5xxx, in a significantly different architecture, there is some >> virtue in extensive testing. >Understatement. Goddard regression tests the flight software between >releases much less between missions (ie TRMM and XTE are based on the >SAMPEX flt hw/sw) using their simulator to feed sensor data to the >actual flight s/w running on the engineering test unit boards and >later on the actual flight h/w itself during I&T. >Screw ups still happen. :) Yes, but if the SRIs on ARiane 5 had been tested (let alone regression tested) using a reasonable simulator then it probably wouldn't have been destroyed in the first place! Best Regards John McCabe