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From: elg@usl (Eric Lee Green)
Newsgroups: comp.arch,comp.unix.wizards,comp.os.minix
Subject: Re: Free Software Foundation (was: Re: Mach, the new standard?)
Message-ID: <275@usl>
Date: Fri, 2-Oct-87 16:57:51 EDT
Article-I.D.: usl.275
Posted: Fri Oct  2 16:57:51 1987
Date-Received: Wed, 7-Oct-87 01:53:01 EDT
References: <1755@ncr-sd.SanDiego.NCR.COM>
Organization: CACS, Univ of SW La, Lafayette, LA
Lines: 17
Xref: mnetor comp.arch:2491 comp.unix.wizards:4652 comp.os.minix:1786

>>In article <1745@ncr-sd>, greg@ncr-sd (Greg Noel) writes:
>>> ... the PDP-11 \does/ have virtual
>>> memory.  It's just that, for various technical reasons, the original Unix
>>> implementation for it chose to use swapping instead of paging as its virtual
>>> memory technique.

I recently purchased the Bach book. The history he gives indicates
that the probable reason Unix originally used swapping instead of
paging, is because the early models of the PDP-11 that they originally
implemented Unix on, did not support paging. In any event, you COULD
run more programs than you had physical memory for, so I'd say that's
virtual memory.

--
Eric Green  elg@usl.CSNET       from BEYOND nowhere:
{ihnp4,cbosgd}!killer!elg,      P.O. Box 92191, Lafayette, LA 70509
{akgua,killer}!usl!elg        "there's someone in my head, but it's not me..."