Re: PET with 8MHz :-)

From: André Fachat <>
Date: Sun, 03 Jan 2010 17:52:28 +0100
Message-ID: <>
> Since IEEE-488 is dependent upon hand shaking it should work fine.

Yes, IEEE488 relies on handshaking and the VIA whose timer is used for timeout is still clocked at 1MHz.

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).

I have also implemented IEEE488 on a number of occasions, and with the commodore bus it never was that simple as it should have been.

So yes, it will probably work - but without test I don't know.

Now the three alternatives I have: 
1) fix my lpt-ieee488 interface - a mess of wires on breadboard...
2) simply us a real 4040 or 8250 drive which would involve taking the drives down from the attic
3) build an ATMEL based lpt-ieee488 replacement, using USB instead of the printer port...


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Received on 2010-01-03 17:00:31

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