Article View: alt.folklore.computers
Article #625545Re: PDP-10 addressing, PDP 11/40 system manual
From: John Levine
Date: Sun, 12 Aug 2018 15:20
Date: Sun, 12 Aug 2018 15:20
25 lines
2671 bytes
2671 bytes
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. -- Regards, John Levine, jo...@iecc.com, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. https://jl.ly
Technical Details
Message-ID:
<pkpj7i$4o0$1@gal.iecc.com>Path:
mbox-mo1.pugleaf.net!c189-v6ni1111ith.0!nntp.google.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!news.snarked.org!news.ripco.com!adore2!news.iecc.com!.POSTED.news.iecc.com!not-for-mailReferences:
<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>Show Full Headers
Complete Article Headers
X-Received: by 2002:a24:b713:: with SMTP id h19-v6mr4833819itf.28.1534087219370; Sun, 12 Aug 2018 08:20:19 -0700 (PDT) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 2002:a02:3d12:: with SMTP id n18-v6ls2498709jan.1.gmail; Sun, 12 Aug 2018 08:20:18 -0700 (PDT) X-Received: by 2002:a02:8782:: with SMTP id t2-v6mr6625654jai.3.1534087218494; Sun, 12 Aug 2018 08:20:18 -0700 (PDT) MIME-Version: 1.0 Path: mbox-mo1.pugleaf.net!c189-v6ni1111ith.0!nntp.google.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!news.snarked.org!news.ripco.com!adore2!news.iecc.com!.POSTED.news.iecc.com!not-for-mail From: John Levine <jo...@taugh.com> Newsgroups: alt.folklore.computers Subject: Re: PDP-10 addressing, PDP 11/40 system manual Date: Sun, 12 Aug 2018 15:20:18 -0000 (UTC) Organization: Taughannock Networks Message-ID: <pkpj7i$4o0$1@gal.iecc.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> Injection-Date: Sun, 12 Aug 2018 15:20:18 -0000 (UTC) Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="4864"; mail-complaints-to="ab...@iecc.com" Cleverness: some X-Newsreader: trn 4.0-test77 (Sep 1, 2010) Originator: jo...@iecc.com (John Levine) Bytes: 2173 Lines: 24 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit