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Article #625469Re: different architecture, was PDP 11/40 system manual
From: John Levine
Date: Tue, 14 Aug 2018 21:29
Date: Tue, 14 Aug 2018 21:29
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In article <mdd1sb0...@panix5.panix.com>, Rich Alderson <ne...@alderson.users.panix.com> wrote: >> GE 635. It was OK, but the profusion of byte instructions added to >> the later models of -10 suggest that it didn't work that well. > >"Profusion of byte instructions"? Lemme see, LDB, DPB, ILDB, IDBP, IBP/ADJBP. >Or are you talking about the string instructions added by the VAX crowd who >got into the microcode? The latter. They do resemble the Vax instructions which resemble 360 instructions like ED and TRT. >I honestly don't know of anyone anywhere who used any >of those--they were slower than hand coded loops using the original set. Yeah, complex microcode can be like that. By the time the -20 got all that stuff, I was making BSD Unix work on an 11/750, which was another story. -- 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:a02:9aa7:: with SMTP id m36-v6mr10866312jak.27.1534282198347; Tue, 14 Aug 2018 14:29:58 -0700 (PDT) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 2002:a6b:ea0f:: with SMTP id m15-v6ls3466269ioc.12.gmail; Tue, 14 Aug 2018 14:29:57 -0700 (PDT) X-Received: by 2002:a6b:d54b:: with SMTP id x11-v6mr10780581ioc.32.1534282197428; Tue, 14 Aug 2018 14:29:57 -0700 (PDT) MIME-Version: 1.0 Path: mbox-mo1.pugleaf.net!c189-v6ni529ith.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: different architecture, was PDP 11/40 system manual Date: Tue, 14 Aug 2018 21:29:57 -0000 (UTC) Organization: Taughannock Networks Message-ID: <pkvhkl$2brk$2@gal.iecc.com> References: <21aaeee8-c41a-4442-a4eb-ea6a29b1e4f1@googlegroups.com> <1355830485.555945700.866949.peter_flass-yahoo.com@news.eternal-september.org> <pkut64$lt6$1@gal.iecc.com> <mdd1sb0n1tl.fsf@panix5.panix.com> Injection-Date: Tue, 14 Aug 2018 21:29:57 -0000 (UTC) Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="77684"; mail-complaints-to="ab...@iecc.com" Cleverness: some X-Newsreader: trn 4.0-test77 (Sep 1, 2010) Originator: jo...@iecc.com (John Levine) Bytes: 1938 Lines: 22 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit