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- Newsgroups: comp.sys.atari.st
- Path: sparky!uunet!mcsun!sunic!kitten.umdc.umu.se!fizban.solace.hsh.se!hasse
- From: hasse@solace.hsh.se (Hans Holmberg)
- Subject: Re: on the need for 'virtual memory'
- Message-ID: <1993Jan13.023556.1623@solace.hsh.se>
- Organization: Solace Computer Club, Sundsvall, Sweden
- References: <C0r8vp.683@news2.cis.umn.edu>
- Date: Wed, 13 Jan 1993 02:35:56 MET
- Lines: 29
-
- In <C0r8vp.683@news2.cis.umn.edu> davidli@simvax.labmed.umn.edu writes:
-
- >Can someone who knows the history of UNIX please comment on whether the
- >early versions of UNIX 'required' virtual memory in order to work? My
- >own impressions are that the PDP computers didn't have any virtual
- >memory, and that most programs that were larger than memory consisted of
- >a series of intelligent overlays. (My impression is partially formed by
- >experience with UNIX 7.0 on a PDP-11/34, requiring a grand total of
- >10 megabytes of hard disk space, and the fact that one of the selling
- >points of the VAX series of computers was the fact that they had virtual
- >address space.)
-
- >-- DPZ
-
- I have a friend that has an old 68k machine, which runs something called
- IDRIS. It's a UNIX derivate from some *very* early version of BSD UNIX, or
- maybe AT&T. It boots from a 360kb floppy disk and the machines memory is only
- on 1MB I think (could be 512kB though), and it doesn't use any virtual memory.
-
- So _my_ conclusion is that they probably didn't need virtual memory in the
- start, but it was added as a feature later on. (RAM was pretty expensive back
- then).
-
- /Hasse
- --
- / email: hasse@solace.hsh.se, irc: Knightman, mud: Kniggit@VikingMud \
- \ snail-mail: Hans Holmberg, Sommarvagen 5, 854 67 Sundsvall, Sweden /
- / phone: +46 60 569169, fax: +46 60 569266 \
- \ "In a crazy world a sane person would appear to be crazy." /
-