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Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!genrad!decvax!decwrl!glacier!mips!kim
From: kim@mips.UUCP (Kim DeVaughn)
Newsgroups: net.micro.amiga,net.micro.68k
Subject: Re: Amiga shown with 68020
Message-ID: <249@mips.UUCP>
Date: Fri, 29-Nov-85 08:34:03 EST
Article-I.D.: mips.249
Posted: Fri Nov 29 08:34:03 1985
Date-Received: Sun, 1-Dec-85 03:27:35 EST
References: <310@amiga.amiga.UUCP> <238@mips.UUCP> <930@plus5.UUCP>
Organization: mips ... where RISC is a way of life
Lines: 29
Xref: watmath net.micro.amiga:927 net.micro.68k:1374

> > Sounds like it could make the Amiga into a SuperAmiga!  Now if we could
> > just clock the thing at 16.7MHz (or even 12.5MHz).  I suspect that that
> 
> As long as Amiga didn't do anything wanky like counting on the AS-DS delays
> or the DS-/AS delays you should be able to supply the 68020 with a "private"
> clock source. And since the 680xx is an async design when it goes outside
> of the private 256k ram it should slow down. When I get my tech specs
> on the amiga I'll check this out.

One can *hope* that this level of info is in the H/W Ref Man ... I wonder if
CBM-Amiga has a set of maintenance manuals for 3rd-party repair people?  That
should include the schematics, timing diagrams, etc.  'Suppose you have to be
a Registered Something-Or-Other to get 'em tho ... sigh!


>                                   I want to put the 20MHz 68020 on my amiga
> and then run Drystone 24 hours a day.

I've not worked with 680x0's until now ... is also possible to run a 68881
with a fast '020 (I don't *think* fast 881's have been announced yet)?  If
not directly, then by playing some reasonable h/w tricks (split clocking, or
some such)?

/kim
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