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- From: tom@afthree.as.arizona.edu (Thomas J. Trebisky)
- Newsgroups: comp.sys.m68k
- Subject: Re: building a low-cost 68030 workstation
- Message-ID: <1992Nov7.022105.15127@organpipe.uug.arizona.edu>
- Date: 7 Nov 92 02:21:05 GMT
- References: <1992Nov4.103207.4053@news.cs.indiana.edu> <DERAADT.92Nov5150436@newt.newt.cuc.ab.ca> <BxApK2.C4A@hermes.hrz.uni-bielefeld.de>
- Sender: news@organpipe.uug.arizona.edu
- Organization: University of Arizona, Tucson, AZ
- Lines: 27
-
- malte@techfak.uni-bielefeld.de (Malte Uhl) writes:
- >By the way, does anyone know of a *simple and cheap* way to replace a 68000
- >with a 68030 ? No additional caches, pipes and whistles please.
- >I plan to replace a MC68000F12 running at 16MHz clock speed.
-
- It can be done -- Motorola had/(has?) an App. Note about doing this, i.e.
- putting an 020 platform board into an existing 68000 system. I think the
- idea at the time was to let people start developing code for the 020 at
- a time in the distant past when little or no 020 hardware was in the world.
-
- Anyway, it was not-trivial. Basically a state machine matched up the two
- different bus-cycles and generated the necessary signals on both ends.
- There was a handful of TTL including flip-flops involved. I have the app.
- note filed somewhere and have intentions of using it RSN. :-) BTW, changing
- from an 020 to an 030 would be trivial, the bus cycles are identical.
-
- >Not prefered but equally fine: Could I replace the 68000 with a 68010 and
- >a 68451 to it ?
-
- I think I would go with the 030 -- for one thing the 030 MMU is far nicer,
- from what I have heard about the 451. And 68451's are probably hard to
- find.
- --
- Tom Trebisky ttrebisky@as.arizona.edu
- ...."There's no sense in being precise when you don't even
- .... know what you're talking about."
- - John von Neumann
-