Re: A parallel interface for PET, VIC-20 and C64/C128

From: Andre Fachat (
Date: 1999-08-03 18:45:34

Marko Mäkelä wrote:
> The only unanswered question is: What is the DIAG pin on the PET user port
> used for?  Can I safely program it as a '1' output and use it as a voltage
> source for the 74HCT74 chip?

If you pull it low (I think) the Kernal does not init BASIC and
directly enters the monitor on startup.


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Andre Fachat, Institute of physics, Technische Universität Chemnitz, FRG
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