Re: PET with 8MHz :-)

From: André Fachat <>
Date: Sun, 03 Jan 2010 19:37:15 +0100
Message-ID: <>
> > However, I had already experimented with a 2Mhz PET version (clocking my
> selfbuilt computer with a Fat40 ROM at 2MHz) but it did not work (even
> though I modified the timeout values).
> It could be a problem in the clock domain crossing from the CPU to the
> 6522 VIA. Is it a single clock divided /8 or is it multiple clocks?
> Also, are the setup and hold times preserved when crossing this boundary?

This should not be a problem, the computer I tried this on was completely running on 2MHz with all 2MHz capable parts. As I said this was my selfbuilt PET replica.


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Received on 2010-01-03 19:00:29

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