Problem erasing & re-using GM Proms

[Jeremy Gonyou]

Hmmm, I don't have any problems.  I use 12.5 V on my 256's.  Seem to 
remember a 32 that took 25 V, though.

Jeremy

>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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