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- Path: sparky!uunet!darwin.sura.net!mips!swrinde!sdd.hp.com!usc!chaph.usc.edu!news
- From: baffoni@aludra.usc.edu (Juxtaposer)
- Newsgroups: comp.sys.atari.st.tech
- Subject: Re: Upgrading the ST or TT ...
- Message-ID: <l78sqqINNmmr@aludra.usc.edu>
- Date: 27 Jul 92 22:06:18 GMT
- References: <l6u6oiINNcod@aludra.usc.edu> <1992Jul27.100013.28213@bas-a.bcc.ac.uk>
- Organization: University of Southern California, Los Angeles, CA
- Lines: 40
- NNTP-Posting-Host: aludra.usc.edu
-
- In article <1992Jul27.100013.28213@bas-a.bcc.ac.uk> ucacmsu@ucl.ac.uk (Mr Stephen R Usher) writes:
-
- >The main problem is that the bus handshaking has totally changed with teh
- >'040. On the 680[0123]0 the CPU has the bus by defaults and gives it up to
- >peripherals. On the 68040 the bus is "free" by default and is only acquired
- >by the CPU when necessary.
-
- I guess I don't understand the implications of having a free bus by
- default - do you (can you) explain, or if its too esoteric, perhaps via email?
- I have read some of the 680x0 manuals (briefly - it wasn't mine :( ) but
- I didn't see anything about this.
-
- >The other problem on course would be adding the '040 FP software to the
- >system :-) and hoping that TOS initialises the PMMU in the chip in the
- >correct way (the '040 only has a sub-set of the instructions for this that
- >the '030 has).
-
- I thought that 3/2.06 and higher was supposed to support 680[01234]0
- without any problems - that and the fact that if Atari does come out with
- a '040 workstation, its tos better support the '040 too :).
-
-
- >
- >Steve
- >
- >If you want to know more get the Motorola 680x0 reference manual.
-
- But who will interpret it for me. You _know_ manuals are written in
- the most obscure technicalese available so that it is equally obfuscated to
- all who read it. :)!
-
- >--
- >Addresses:-
- >JANET:- ucacmsu@uk.ac.ucl or steve@uk.ac.ox.earth (preferable)
- >Internet:- ucacmsu@ucl.ac.uk or steve@earth.ox.ac.uk (preferable)
-
- -Mike
-
- PS: Someone earlier posted about a 68k newsgroup. Do you remember the exact
- name of the group - sounds like I should subscribe...:)!
-