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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Thomas Koenig <tkoenig@netcologne.de> Newsgroups: comp.arch Subject: Re: architecture, The Design of Design Date: Wed, 8 May 2024 10:03:51 -0000 (UTC) Organization: A noiseless patient Spider Lines: 19 Message-ID: <v1fim7$3t28r$1@dont-email.me> References: <v03uh5$gbd5$1@dont-email.me> <c4ee3c91e9a05dee1098a3786edb61df@www.novabbs.org> <v0rhqv$1itj$3@gal.iecc.com> <86r0emt69e.fsf@linuxsc.com> <v0tuqt$613$2@gal.iecc.com> <86a5l2tnyk.fsf@linuxsc.com> <20240507115433.000049ce@yahoo.com> Injection-Date: Wed, 08 May 2024 12:03:52 +0200 (CEST) Injection-Info: dont-email.me; posting-host="0b4a52159ec439f4b647a7b314d6f575"; logging-data="4098331"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/yzRmX0QkvsfxZFp8ULcGx7rRZwX/P2vc=" User-Agent: slrn/1.0.3 (Linux) Cancel-Lock: sha1:C3raXxpVtbgmzL0WtgWRxOEmbNA= Bytes: 1998 Michael S <already5chosen@yahoo.com> schrieb: > My impression is that until S/360 there was no such thing as different > by 100% SW compatible models. I think the important thing was that S/360 was designed and built, right from the start, as a _series_ of compatible computers, which were upward- and downward-compatible. They had the challenge of designing an architecture where the instructions for the high-end supercomputers still needed to work (although slowly) on the low-end bread and butter machines, and what was efficient on the low-end bread and butter machines should not constrain the high-end supercomputers. Most other computer series were built one at a time, with successors usually extending the previous ones (which IBM also did with the /370, series). The VAX may have been another such line - DEC did not release several models all at once, but they did release the cheaper and slower 11/750 after they had released the 11/780.