Problem erasing & re-using GM Proms

[Shannen Durphey]

I have trouble with some GM 27128's.  
Shannen

ECMnut at aol.com wrote:
> 
> Have anyone been able to erase a GM prom & reprogram it?
> I always have to solder a regular 27xxxx eprom on before I can
> re-program..  I can never seem to re-burn the factory original
> prom, which doesn't seem to have meaningful identifiers on it.
> My latest is a 27256 like thing from a '93 L35 4.3 engine.
> Could I be using the wrong programming voltage?
> Thanks,
> Mike V
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