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From: greg@isrnix.UUCP (Gregory Travis)
Newsgroups: net.arch
Subject: Re: PDPs & Virtual Mem
Message-ID: <836@isrnix.UUCP>
Date: Tue, 23-Sep-86 22:47:54 EDT
Article-I.D.: isrnix.836
Posted: Tue Sep 23 22:47:54 1986
Date-Received: Thu, 25-Sep-86 03:52:17 EDT
Organization: Inst. for Social Research (Indiana University, 47405)
Lines: 15
Keywords: small address, memory

The notion that the PDP-11 doesn't have virtual memory is completely false.
I have written UN*X variations for the 11 which did NOT require that
a program be completly loaded to run.  As long as the processor
has the ability to restart an arbitrary instruction (11/40's did not)
the 11 can do "virtual memory."  And I mean to say that a 16K 11 can
pretend it's a 64K 11 NO PROBLEM!   Just because the 11's physical
memory can exceed its directly addressable memory doesn't mean squat.
Sure, pages might be 8K, but the main point is that it can appear that
the 11 has more physical memory than it really has.

-- 
    Gregory R. Travis
    Institute for Social Research - Indiana University - Bloomington, In
    ihnp4!inuxc!isrnix!greg
    {pur-ee,allegra,qusavx}!isrnix!greg