On 17/03/2016 6:16 PM, frank wrote:
> Hi all,
>
> an easy one. It might be interesting if someone still hasn't heard about
> piggybacking of the DRAM chips to identify ram problems.
> This usually works when the opening screen bytes count isn't correct
> or when it just throws an out of memory error at the start.
> This means that at least page 0 and page 1 (the stack) are mostly working
> and some other parts of the ram space are not working.
>
> https://www.youtube.com/watch?v=hZjjOd1OJYs
>
> Don't bother trying to piggyback the DRAMs on a black screen situation anyway
> :-)
>

I haven't watched the video yet but I could have told you that ;-)

Usually the fingertip touch tells you of a DRAM problem. If it's a C64C
it is almost certainly a DRAM problem if you get a black screen. I've
had to replace many.

Check the power supply ripple on the 5V, the DRAM really doesn't like it.

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