Terry Raymond  wrote:
> Hi where could I find all C64/ C-128 MOS chip pin info mainly
> I need to know with each chip where Ground pin is?

Try doing a web search for the part numbers, you should be able
to find datasheets which will show the pinouts. I think there
are some sites that have the MOS Tech. chip information all in
one place, but I don't have those bookmarks with me now.

> I looked n the C64 Programmers Reference manual but not much there.

The C64 schematic should show you what the pins do, if you know how
to read it.

> I saw a utube video of a guy using a Multi-Meter set on OHM's but
> the highest reading, he mentioned finding the GND pin, then
> reading each pin should read very high.  His findings revealed
> any low resistance reading might indicate possible internal
> malfunctions, shorts etc (inside the chip).  He was testing a
> PLA chip this way, then inserted it into the chip socket,
> turned the power on, getting anything from garbage screens, no
> startup message, no READY prompt Blank or black screen (is what
> mine is doing) etc.  He read a good PLA with high resistance
> readings and that PLA worked okay.

That may detect a common failure mode in the PLA IC, but it isn't
a solution for testing all ICs. Some are designed with a
resistance between GND and outputs or inputs.

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