RE: PLA replacement for C64

Hallo Didier,


> I thought it was 4164

It is indeed the 4164.

The problem can indeed be one of RAM ICs as well. But I never encountered a board were a faulty RAM was the reason for not starting up. But theoretically it is possible. 

In the 80's I built a debugger that enabled me to step the 6510 and to see what the address and data lines did. A real faulty ROM showed nonsense at the know reset vector and if I had a faulty RAM the first JSR would go wrong. I'm also able to let the 6510 (or 6502) run up to a predefined address and to step from there on. But if it didn't stop at all, then I would know that something had go wrong. By try-and-error I was able to find the address where it went wrong and then to see what went wrong. Quite handy. 

For details: http://www.baltissen.org/newhtm/debugger.htm



With kind regards / met vriendelijke groet, Ruud Baltissen
www.Baltissen.org



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