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Article #625509Re: ancient memories, was PDP 11/40 system manual
From: John Levine
Date: Thu, 16 Aug 2018 02:32
Date: Thu, 16 Aug 2018 02:32
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2306 bytes
In article <pl2en...@news3.newsguy.com>, Charlie Gibbs <cgibbs@kltpzyxm.invalid> wrote: >I never heard of a 360 having a full 16MB, and I suspect that >nobody could justify the cost. You couldn't The /65 had a max of 2M of regular core and 8M of slow LCS core. The 85 and 195 could have 4M of fast core. The 91 could have 2M of fast core and/or 4M of not quite so fast core although I don't know of anyone who got the 4M. On the other hand, they were planning for technical evolution at the time, and it would not have cost them very much to reserve the high byte of addresses rather than letting the system programmers who were trying to squash every byte out of OS stick flags there. -- 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
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X-Received: by 2002:a5e:d908:: with SMTP id n8-v6mr6928247iop.77.1534386775497; Wed, 15 Aug 2018 19:32:55 -0700 (PDT) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 2002:a02:a687:: with SMTP id j7-v6ls601668jam.3.gmail; Wed, 15 Aug 2018 19:32:54 -0700 (PDT) X-Received: by 2002:a02:a319:: with SMTP id q25-v6mr13321228jai.44.1534386774522; Wed, 15 Aug 2018 19:32:54 -0700 (PDT) MIME-Version: 1.0 Path: mbox-mo1.pugleaf.net!g5-v6ni3051iti.0!nntp.google.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!news.iecc.com!.POSTED.news.iecc.com!not-for-mail From: John Levine <jo...@taugh.com> Newsgroups: alt.folklore.computers Subject: Re: ancient memories, was PDP 11/40 system manual Date: Thu, 16 Aug 2018 02:32:53 -0000 (UTC) Organization: Taughannock Networks Message-ID: <pl2nol$k04$1@gal.iecc.com> References: <21aaeee8-c41a-4442-a4eb-ea6a29b1e4f1@googlegroups.com> <pkl2h6$abc$2@gal.iecc.com> <715eff9f-01d8-439d-98a2-5e199e66ddc7@googlegroups.com> <pl2enr02fij@news3.newsguy.com> Injection-Date: Thu, 16 Aug 2018 02:32:53 -0000 (UTC) Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="20484"; mail-complaints-to="ab...@iecc.com" Cleverness: some X-Newsreader: trn 4.0-test77 (Sep 1, 2010) Originator: jo...@iecc.com (John Levine) Bytes: 1794 Lines: 19 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit