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Article #625543Re: PDP-10 addressing, PDP 11/40 system manual
From: Quadibloc
Date: Sat, 11 Aug 2018 17:32
Date: Sat, 11 Aug 2018 17:32
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2604 bytes
On Saturday, August 11, 2018 at 9:23:08 AM UTC-6, John Levine wrote: > In article <1173318279.555679658.757...@news.eternal-september.org>, > Peter Flass <peter...@yahoo.com> wrote: > >I was > >sorry when it was canceled, although I suspect it would have been difficult > >to expand the architecture to larger memory sizes. > We don't have to guess. They did expand the addressing for the DEC-20 > and it was pretty ugly. The extra address bits were called the > section number, with some addressing being within the current section > and some being global. TOPS-20 supported it but I don't recall many > programs using it. The Sigma 9 from Xerox/SDS also took an existing architecture with a full-length address in the instruction, and modified it to use more memory than that address could support. I think it was ugly too; but I suppose that it could still be said that if the memory expansion method actually used was a kludge, that doesn't prove th at something better might not be possible. John Savard
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