Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!pacific.mps.ohio-state.edu!ohstpy!miavx1!rlcollins
From: rlcollins@miavx1.acs.muohio.edu (Ryan 'Gozar' Collins)
Newsgroups: comp.sys.atari.st
Subject: Re: Does anybody no anything about UNIX on an Atari ST
Message-ID: <1528.266f1bae@miavx1.acs.muohio.edu>
Date: 8 Jun 90 08:29:50 GMT
References: <669@hexagon.pkmab.se> <90150.161022SA44@LIVERPOOL.AC.UK> <10060@chaph.usc.edu> <1990Jun6.225653.24296@math.lsa.umich.edu>
Lines: 37

In article <1990Jun6.225653.24296@math.lsa.umich.edu>, hyc@math.lsa.umich.edu (Howard Chu) writes:
> In article <10060@chaph.usc.edu> baffoni@alcor.usc.edu (Juxtaposer) writes:
>>In article <90150.161022SA44@LIVERPOOL.AC.UK> SA44@LIVERPOOL.AC.UK (Kevin Maguire) writes:
>>>space 128K for big (?) processes). The ST is only limited by memory size.
>>>OF course it's nice to have 4M as minix has no virtual memory, but
>>
>>Disclaimer: I do not claim to know much about the ST architecture but...
>>
>>
>>   I was wondering if there are ANY (preferably transparent) programs out that
>>will enable an ST to use its hard-drive as a source of virtual-memory:  As long
>>as the software you are using doesn't need to skip all over memory while it is
>>running, this sure would be a nice way to give yourself an 8-meg machine (4meg
> 
> This seems to be impossible on a plain ST. A paged virtual memory system
> automatically implies page-faults - traps generated by accessing a virtual
> page that isn't currently in real memory. First there's no straightforward
[ Stuff deleted]
 
> So... Unless you can add in some whiz-bang hardware, I don't think you can
> get away with it. And even if you can, I don't think it'll run very quickly,
> but that's probably not important. The main thing is, you can get better 
> performance using a chip that was designed to handle VM in the first place.
> (68010 on up. 68020 would probably be minimum, though I *think* you can use the
> PMMU with the 68010.)
> --
>   -- Howard Chu @ University of Michigan
>   ... the glass is always greener on the side ...
I thought OS-9 offered virtual memory? Or did I hear wrong....

		Goz
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~ Ryan 'Gozar' Collins ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"When you have Super Powers,                  rlcollins@miavx1.BITNET
hard work is easy"                             rc1dsanu@miamiu.BITNET
 -Dufus from Ducktails
~~~~~~~~~~~~~~~~~~~~~~Yea, right, thats what I said.~~~~~~~~~~~~~~~~~~~~~~~~~