[pups] Unix and PDP11/20 (was PDP-9?)

John Holden johnh at psych.usyd.edu.au
Mon Sep 2 12:19:13 AEST 2002

Early editions of Unix did run on a PDP11/20, written in assembly language.
There was a memory mapping option KS-11 that sat between the processor and
Unibus that mapped chunks of memory. It was a DEC special, and only about a
dozen were built. See http://cm.bell-labs.com/cm/cs/who/dmr/odd.html 
A hardware story'

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