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- Path: sparky!uunet!darwin.sura.net!mips!swrinde!elroy.jpl.nasa.gov!usc!chaph.usc.edu!news
- From: baffoni@aludra.usc.edu (Juxtaposer)
- Newsgroups: comp.sys.atari.st.tech
- Subject: Upgrading the ST or TT ...
- Message-ID: <l6u6oiINNcod@aludra.usc.edu>
- Date: 23 Jul 92 20:48:18 GMT
- Organization: University of Southern California, Los Angeles, CA
- Lines: 29
- NNTP-Posting-Host: aludra.usc.edu
-
-
-
- Someone wrote about upgrading their ST from a 68k to an '030 a couple
- of posts back. I can think of several problems right off the bat: 1) you are
- talking about putting a 32bit chip into a 16bit bus, so you would have to
- do some intelligent memory fetching to make it as trasnparent as possible
- (which means that speed just went down by 1/2). 2) you won't have any support
- for enabling/disabling the on-board cache (yes, people still write cache-
- insensitive code so you gotta be able to turn off all 512bytes of cache).
- 3) Unless you have TOS1.6 or higher, the TOS will be incompatible. All in
- all, unless you have lots of time, and a great set of designing skills, don't
- bother.
-
- However, this turn of thought makes one wonder about something that
- on the surface seems much better:
-
- Assuming you make a small logic board to enable pin compatibility,
- can the '030 in the TT be replaced with the '040 without much of a major
- hassle (ie: is it more complicated than stealing the signals from the '030
- (and disabling it) and routing them to the '040?) As far as I know, the
- only major difference (hardware wise) is the larger cache and the bus-snooping
- logic (which wont make much of a difference if you don't plan on putting
- more than one '040 in it - Hmmm maybe two...:). Can anyone think of a good
- reason for shooting this down? Or should we all be getting out our bread
- boards (ha! more like etched boards:) and turbocharging our TTs?
-
- Food for thought...
-
- -Mike
-