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Posting-Version: version B 2.10.2 9/18/84; site lsuc.UUCP
Path: utzoo!lsuc!jimomura
From: jimomura@lsuc.UUCP (Jim Omura)
Newsgroups: comp.sys.m68k
Subject: Re: Re: What's Nu with VME for Mac?
Message-ID: <1384@lsuc.UUCP>
Date: Sat, 15-Nov-86 08:19:20 EST
Article-I.D.: lsuc.1384
Posted: Sat Nov 15 08:19:20 1986
Date-Received: Sat, 15-Nov-86 08:54:40 EST
References: <842@gould9.UUCP> <1240@hoptoad.uucp>
Reply-To: jimomura@lsuc.UUCP (Jim Omura)
Organization: Consultant, Toronto
Lines: 34
Summary: VME Motorola?  Yes and no.

In article <401@intsc.UUCP> tomk@intsc.UUCP (Tom Kohrs) writes:
>In article <1381@lsuc.UUCP James Omura writes:
>>                                                  It said that VME
>> was a Motorola bus.  VME has been heavily promoted by Motorola but
>> it is *not* a Motorola bus.  It is intended to be a generallized
>> design.
>
>What ever Motorola may have told the public, VME is not a generalized bus.
>All of the control signals and timings are direct extensions of 68000 
>processor.   You might be able to consider VME as a non-Mot product much
>like the 68K is no longer a Motorola product.  If you think the VME 
>architecture is generalized talk to someone that has tried to put a non-68K
>engine on the bus, it is not trivial.


     I think we're not looking at the problem the same way.  As such
I think I'm not in disagreement with you or the original article anymore.
In terms of buss signals I expect you're right (I'm not going to bother
checking).  I was looking at it from the historical development.  It
was developed out of a consensus of primarily European users with
Motorola "input" into the design process.  The asynch nature of the
bus was in part to accomodate differences in technology.  As I
understand it, it's hard to design an asych card no matter what
technology, so 68K specific signals aside, asking someone who has
tried to make an Intel product based card for such a system is going
to produce negative responses.

Cheers! -- Jim O.
-- 
Jim Omura
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