RE: PLA replacement for C64

From: Baltissen, GJPAA (Ruud) <>
Date: Wed, 29 Apr 2015 12:29:20 +0000
Message-ID: <>
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:

With kind regards / met vriendelijke groet, Ruud Baltissen

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Received on 2015-04-29 13:00:06

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