Article View: alt.folklore.computers
Article #625517Re: PDP 11/40 system manual
From: Scott Lurndal
Date: Fri, 17 Aug 2018 19:28
Date: Fri, 17 Aug 2018 19:28
21 lines
2959 bytes
2959 bytes
Peter Flass <peter...@yahoo.com> writes: >Quadibloc <jsa...@ecn.ab.ca> wrote: >> On Wednesday, August 15, 2018 at 1:03:44 PM UTC-6, han...@bbs.cpcn.com wrote: >>> Storage was very >>> expensive back then. I don't believe S/360 ever existed 16 meg, >>> indeed, I think it took a long time until S/370 even exceeded it. >> >> Since 16 megabytes was their address space, it's hard to see how any System/360 >> (other than a 360/67) _could_ have exceeded it. >> > >Cable length was the big problem. If you put the core too far from the CPU >you had to go with slow memory. Each <mumble>K of core needed its own >frame. One of the larger machines had the boxes of core arranged in an "X" >around the CPU to try to reduce cable length. I'm not sure about core, but >I think some large shops put disk controllers one floor down from the CPU >and dropped the channel cables thru the floor to reduce distance. We had a burroughs B6800 with global memory at one of the plants. To keep cable lengths in play, they had the memory on the floor immediatly above the cpu complex and ran the cables down.
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X-Received: by 2002:a1c:7003:: with SMTP id l3-v6mr2678803wmc.28.1534534107567; Fri, 17 Aug 2018 12:28:27 -0700 (PDT) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 2002:a1c:4c08:: with SMTP id z8-v6ls1959453wmf.6.canary-gmail; Fri, 17 Aug 2018 12:28:26 -0700 (PDT) X-Received: by 2002:a7b:c00e:: with SMTP id c14-v6mr2890798wmb.16.1534534106755; Fri, 17 Aug 2018 12:28:26 -0700 (PDT) MIME-Version: 1.0 Path: mbox-mo1.pugleaf.net!w16-v6ni5655wmw.0!nntp.google.com!feeder1-2.proxad.net!proxad.net!feeder1-1.proxad.net!ecngs!feeder2.ecngs.de!87.79.20.101.MISMATCH!newsreader4.netcologne.de!news.netcologne.de!peer01.ams1!peer.ams1.xlned.com!news.xlned.com!peer01.am4!peer.am4.highwinds-media.com!peer02.iad!feed-me.highwinds-media.com!news.highwinds-media.com!post02.iad!fx43.iad.POSTED!not-for-mail X-newsreader: xrn 9.03-beta-14-64bit Sender: scott@dragon.sl.home (Scott Lurndal) From: scott@slp53.sl.home (Scott Lurndal) Reply-To: sl...@pacbell.net Subject: Re: PDP 11/40 system manual Newsgroups: alt.folklore.computers References: <21aaeee8-c41a-4442-a4eb-ea6a29b1e4f1@googlegroups.com> <mdd7ekzl6pr.fsf@panix5.panix.com> <pki8ae$ca0$1@dont-email.me> <1028478389.555543171.735142.peter_flass-yahoo.com@news.eternal-september.org> <pkl2h6$abc$2@gal.iecc.com> <715eff9f-01d8-439d-98a2-5e199e66ddc7@googlegroups.com> <72800c64-b531-477d-aa16-b30ff7c2d70e@googlegroups.com> <38853659.556223633.740467.peter_flass-yahoo.com@news.eternal-september.org> Lines: 21 Message-ID: <ulFdD.172618$UX7.16413@fx43.iad> X-Complaints-To: ab...@usenetserver.com NNTP-Posting-Date: Fri, 17 Aug 2018 19:28:26 UTC Organization: UsenetServer - www.usenetserver.com Date: Fri, 17 Aug 2018 19:28:26 GMT X-Received-Bytes: 2201 X-Received-Body-CRC: 206260304 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit