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Article #625546Re: PDP-10 addressing, PDP 11/40 system manual
From: Questor
Date: Mon, 13 Aug 2018 07:56
Date: Mon, 13 Aug 2018 07:56
23 lines
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2794 bytes
On Sun, 12 Aug 2018 15:20:18 -0000 (UTC), John Levine <jo...@taugh.com> wrote: >In article <0897e059-0b26-4334...@googlegroups.com>, >Quadibloc <jsa...@ecn.ab.ca> wrote: >>> >sorry when it was canceled, although I suspect it would have been difficult >>> >to expand the architecture to larger memory sizes. >> >>> We don't have to guess. They did expand the addressing for the DEC-20 >>> and it was pretty ugly. ... > >>I think it was ugly too; but I suppose that it could still be said that if the >>memory expansion method actually used was a kludge, that doesn't prove th at >>something better might not be possible. > >The people who did it were pretty smart. An obvious alternative would >be a mode bit, like 16 vs 32 bit segments on the 386, and different >instruction formats, but if it's not backward compatible with 18 bit >code, you might as well switch to a Vax, which is what everyone did. > >The Vax was a mistake, too, beautifully optimized for a hardware and >software environment that was immediately obsolete, but that's a >different argument. Possibly a result of trying to maintain a bridge to the PDP-11 world.
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X-Received: by 2002:a1c:f701:: with SMTP id v1-v6mr1095134wmh.25.1534146957439; Mon, 13 Aug 2018 00:55:57 -0700 (PDT) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 2002:a1c:c90f:: with SMTP id f15-v6ls1934231wmb.4.canary-gmail; Mon, 13 Aug 2018 00:55:56 -0700 (PDT) X-Received: by 2002:a1c:9e42:: with SMTP id h63-v6mr1200465wme.10.1534146956914; Mon, 13 Aug 2018 00:55:56 -0700 (PDT) MIME-Version: 1.0 Path: mbox-mo1.pugleaf.net!a22-v6ni12987wmg.0!nntp.google.com!goblin1!goblin2!goblin.stu.neva.ru!ecngs!feeder2.ecngs.de!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed9.news.xs4all.nl!85.12.16.68.MISMATCH!peer01.ams1!peer.ams1.xlned.com!news.xlned.com!peer01.am4!peer.am4.highwinds-media.com!peer02.iad!feed-me.highwinds-media.com!news.highwinds-media.com!post02.iad!fx36.iad.POSTED!not-for-mail From: usenet@only.tnx (Questor) Newsgroups: alt.folklore.computers Subject: Re: PDP-10 addressing, PDP 11/40 system manual Organization: random access Reply-To: usenet@only.tnx Message-ID: <5b71399e.12097935@news.dslextreme.com> References: <21aaeee8-c41a-4442-a4eb-ea6a29b1e4f1@googlegroups.com> <1173318279.555679658.757757.peter_flass-yahoo.com@news.eternal-september.org> <pkmv0r$2bhi$1@gal.iecc.com> <0897e059-0b26-4334-82ff-5c0b2253a89e@googlegroups.com> <pkpj7i$4o0$1@gal.iecc.com> X-Newsreader: Forte Free Agent 1.21/32.243 Lines: 24 X-Complaints-To: abu...@dslextreme.com NNTP-Posting-Date: Mon, 13 Aug 2018 07:55:56 UTC Date: Mon, 13 Aug 2018 07:56:18 GMT X-Received-Bytes: 2042 X-Received-Body-CRC: 3228130265 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit