Author: David Blackman
Date: 22:28:13 05/17/01
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On May 16, 2001 at 14:00:12, Brian Richardson wrote: > >I have worked on a B5500. To the best of my recollection, it was a 48 bit >machine with a stack architecture. The instruction set was designed to optimize >Algol code (most of the operating system was written in Algol MCP - master >control program and CANDE control and edit interface). I also _think_ it was >the first system with virtual memory (which would imply some protection scheme). Yes it had virtual memory, but segment based, not page based. There was no hardware support for memory protection. It was done entirely in software and relied on the compilers to generate safe code.
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