Hello!

Who can share a list of resistance values ​​between different pins of 6526? Has anyone thought of measuring interpin voltage drops with a tester in diode continuity mode?

I have doubts that my chip is working properly. But I would like to make sure that this is NOT the fault of the power supply.

Hi!

I don't think measuring resistance and/or voltage drops between pins is going to give you a clear diagnostic. There are 1000+ transistors inside a 6526 and these values are going to vary wildly between different production technologies and even batches.

You should probably aim for a software test that tries every possible use of the 6526. Are you using it as a component for your own build? Or is it inside a Commodore computer?

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