Re: Tracking down a voltage dependent chip

Bipolar (TTL (7400 series) and ECL and the old frame buffer RAM) speeds up
as it gets warmer. MOS (large RAM/ROM/EPROM) slows as it warms.

Everything gets faster with increased voltage.

So you can lower voltage until it starts acting up then either warm bipolar
or cool MOS a bit and note the effect.

Also, ECL was used in early Nintendo and it ran from a separate -5.1 (?)
supply, make sure to check that. It doesn't sound like an ECL problem,
though.
On Sep 21, 2013 5:24 PM, "David Shoemaker" <davids@oz.net> wrote:

> I have a DK which if the voltage is low at all (like 4.95v) will start to
> display graphic corruption (Kong gets stripes and princes hair starts to go
> to the wrong place). Any suggestions on finding the chip involved? I have
> done this before by piggybacking the ram / buffers around the sprite but in
> this case I get no change.****
>
> ** **
>
> Thanks,****
>
> David****
>
> ** **
>
> ** **
>

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Received on Sat Sep 21 18:41:47 2013