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Article #625496Re: PDP 11/40 system manual
From: John Levine
Date: Tue, 14 Aug 2018 15:01
Date: Tue, 14 Aug 2018 15:01
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In article <pku662$vso$1...@Iltempo.Update.UU.SE>, Johnny Billquist <b...@softjar.se> wrote: >On 2018-08-14 03:38, Charlie Gibbs wrote: >> data manipulation instructions. The Dungeon binary was threaded code >> implemented in hardware. > >You do know that Dungeon is written in FORTRAN? So you were >disassembling something produced by a compiler. Sounds like the old fc compiler. When I was a grad student in the late 1970s I made some minor changes to it so it could give you a backtrace if something failed. If the threaded code pseudo PC was R5, each of the threaded code routines ended with JMP @(R5)+ which dispatched directly to the next one. It wasn't particularly fast but the code was compact and you could do interesting stuff by customizing the thread routines. -- 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:a6b:9a13:: with SMTP id c19-v6mr7714838ioe.73.1534258900860; Tue, 14 Aug 2018 08:01:40 -0700 (PDT) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 2002:a02:9084:: with SMTP id x4-v6ls3458965jaf.7.gmail; Tue, 14 Aug 2018 08:01:39 -0700 (PDT) X-Received: by 2002:a02:4d:: with SMTP id 74-v6mr10413639jaa.15.1534258899762; Tue, 14 Aug 2018 08:01:39 -0700 (PDT) MIME-Version: 1.0 Path: mbox-mo1.pugleaf.net!g5-v6ni849iti.0!nntp.google.com!border1.nntp.dca1.giganews.com!border2.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: PDP 11/40 system manual Date: Tue, 14 Aug 2018 15:01:39 -0000 (UTC) Organization: Taughannock Networks Message-ID: <pkuqsj$4hh$1@gal.iecc.com> References: <21aaeee8-c41a-4442-a4eb-ea6a29b1e4f1@googlegroups.com> <3777ab2c-1407-4803-a5f0-a8bcc34bad9d@googlegroups.com> <pktbqm02dr4@news1.newsguy.com> <pku662$vso$1@Iltempo.Update.UU.SE> Injection-Date: Tue, 14 Aug 2018 15:01:39 -0000 (UTC) Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="4657"; mail-complaints-to="ab...@iecc.com" Cleverness: some X-Newsreader: trn 4.0-test77 (Sep 1, 2010) Originator: jo...@iecc.com (John Levine) Bytes: 1862 Lines: 20 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit