Article View: alt.folklore.computers
Article #625582Re: PDP 11/40 system manual
From: Charlie Gibbs
Date: Tue, 14 Aug 2018 02:26
Date: Tue, 14 Aug 2018 02:26
16 lines
2489 bytes
2489 bytes
On 2018-08-13, Questor <usenet@only.tnx> wrote: > One amusing pastime is to list *all* the different instructions that can > be used to zero an accumulator... If your program counter, instruction register, and data registers are in low-order memory, there are a lot of fun ways to code a one-instruction loop. Decrementing the program counter by the length of the instruction is just the beginning. Or you can decrement the program counter by twice the length of the instruction and make your program run backwards. -- /~\ cgibbs@kltpzyxm.invalid (Charlie Gibbs) \ / I'm really at ac.dekanfrus if you read it the right way. X Top-posted messages will probably be ignored. See RFC1855. / \ Fight low-contrast text in web pages! http://contrastrebellion.com
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X-Received: by 2002:a1c:f503:: with SMTP id t3-v6mr1503717wmh.23.1534213645916; Mon, 13 Aug 2018 19:27:25 -0700 (PDT) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 2002:a1c:1f17:: with SMTP id f23-v6ls2623018wmf.1.canary-gmail; Mon, 13 Aug 2018 19:27:25 -0700 (PDT) X-Received: by 2002:a1c:7c19:: with SMTP id x25-v6mr1583695wmc.20.1534213645369; Mon, 13 Aug 2018 19:27:25 -0700 (PDT) MIME-Version: 1.0 Path: mbox-mo1.pugleaf.net!p4-v6ni581wmb.0!nntp.google.com!proxad.net!feeder1-2.proxad.net!weretis.net!feeder4.news.weretis.net!border2.nntp.ams1.giganews.com!nntp.giganews.com!newsreader4.netcologne.de!news.netcologne.de!peer02.ams1!peer.ams1.xlned.com!news.xlned.com!peer02.am4!peer.am4.highwinds-media.com!peer01.iad!feed-me.highwinds-media.com!news.highwinds-media.com!spln!extra.newsguy.com!newsp.newsguy.com!news2 From: Charlie Gibbs <cgibbs@kltpzyxm.invalid> Newsgroups: alt.folklore.computers Subject: Re: PDP 11/40 system manual Date: 14 Aug 2018 02:26:22 GMT Organization: NewsGuy.com Lines: 16 Message-ID: <pkteke228n8@news2.newsguy.com> References: <21aaeee8-c41a-4442-a4eb-ea6a29b1e4f1@googlegroups.com> <0001HW.211B94B1040CADA5700004B5B2CF@news.giganews.com> <mdd7ekzl6pr.fsf@panix5.panix.com> <pki8ae$ca0$1@dont-email.me> <mddh8k2vyfh.fsf@panix5.panix.com> <pkl609$smf$1@dont-email.me> <38c09876-c7ce-4e49-9a08-e0f3cb7a8cbd@googlegroups.com> <y2a600gfvsx.fsf@offog.org> <5b7139cf.12146686@news.dslextreme.com> NNTP-Posting-Host: p34bbf0d68fec04621fc87849a538c61ced6ce030c2c35c04.newsdawg.com User-Agent: slrn/1.0.3 (Linux) X-Received-Bytes: 1704 X-Received-Body-CRC: 3002233911 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit