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- From: Stephen Usher <Stephen.Usher@earth.ox.ac.uk>
- Subject: Re: Hardware and 8MHz 68000 machines
- Date: Sun, 23 Jan 1994 00:15:06 +0000 (GMT)
- In-Reply-To: <199401221503.AA16127@ruulot.let.ruu.nl> from "Annius Groenink" at Jan 22, 94 04:03:20 pm
- Mime-Version: 1.0
-
- >> I admit this would break programs which were not
- >> virtual-memory aware which go straight for the hardware.
- >
- >Which in some cases is the only option (STE sound hardware for example)!
-
- Which is why I would suggest that TOS-domain processes should be assumed to
- be non-relocatable, provided with only contiguous memory and live in
- physical address space. Of course, all the normal hardware would appear in
- its physical address space whatever.
-
- >> The main problem I see is catering for the ST{F,FM,M} series machines, those
- >> with mere 68000's. The only way I can see a non-blocking fork being
- >> implemented is via shadowing, as used in Minix.. and does that slow the
- >> machine down or what?
- >
- >Sorry, but if we go on wanting to cater for 68000 machines we're never going
- >to get something which matches the standards of today. I mean think about
- >it.
-
- Hmm... but the majority of Atari users are still running 68000 based
- machines. This means that we MUST cater for them if at all possible. Hence,
- we should allow a non-blocking fork on the 68000 machines too.. this doesn't
- mean that it will have to be done in the same way on 68030 based machines.
- These machines could easily have swapping and demand paging added once
- virtual addressing is implemented.
-
- >
- >regards,
- >--
- >Annius V. Groenink | E-mail: avg@cwi.nl | Private & ZFC:
- >CWI, Kruislaan 413 | Office: M233 | P.O. Box 799
- >1098 SJ Amsterdam | Ext: 4077 | NL 3500 AT Utrecht
- >Netherland | Phone: +31 20 592 4077 | Phone: +31 30 803740
-
- Steve
-
- --
- ---------------------------------------------------------------------------
- Computer Systems Administrator, Dept. of Earth Sciences, Oxford University.
- E-Mail: steve@uk.ac.ox.earth (JANET) steve@earth.ox.ac.uk (Internet).
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