Path: utzoo!attcan!uunet!convex!swarren
From: swarren@convex.com (Steve Warren)
Newsgroups: comp.sys.amiga
Subject: Re: Amiga project feedback.
Message-ID: <100463@convex.convex.com>
Date: 8 Mar 90 17:14:50 GMT
References: <13188@baldrick.udel.EDU>
Sender: usenet@convex.com
Organization: Convex Computer Corporation; Richardson, TX
Lines: 19

In article <13188@baldrick.udel.EDU> BARRETT@owl.ecil.iastate.edu (Marc Barrett) writes:
>   The project I am speaking of would replace the 28.5Mhz clock with a 40Mhz
>signal.  This signal would be divided by four to produce a 10Mhz base frequency
>instead of the normal 7.12Mhz.  This would have the effect of speeding everything
>up across the board -- video, audio, everything.  The video in particular would 
>have a higher frequency: in interlace mode, the 'jitter' would be occurring at 
>43Hz instead of 30Hz, reducing the flicker significantly.

My guess is that this increase by about 35% is way over the built-in margins.
I would expect that a lot of logic is going to miss set-up times if you clock
it at a 35% faster rate.  All those custom chips have got to have some pretty
tight timing in spots.  Most likely the enhanced custom chip set (God speed
it) will have significantly tighter timing constraints.  But it sounds easy
enough to test if you want to try it out.  Don't let me stop you ;^).

--
--Steve
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