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Article #625516Re: PDP 11/40 system manual
From: Peter Flass
Date: Fri, 17 Aug 2018 18:38
Date: Fri, 17 Aug 2018 18:38
19 lines
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2551 bytes
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. -- Pete
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