> S. California does, too, as I learned whilst exposing PC boards for
etch.  I
> tried the erase-the-EPROMs stunt once, and all I got was a batch of
dead
> EPROMs.  My guess was the heat did it.  (They "appeared" blank but
would not
> program.)

I had a 2708 that got left in the sun for too long, and that appeared to
fail in 'wont program' state. It had a clear window on it that had a bit
of a lens effect, and I hypothesised that the heat and light from the
sun had damaged the IC in some way, rather than just erased it.
--=20
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--=20
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