On Friday, August 17, 2012 11:05:29 AM UTC-7, Slater wrote:
Is it possible to damage an EPROM by exposing it to UV light for too

long?

Yes, sometimes. The reason is, EPROM designs sometimes use
difference amplifiers with dummy cells that are factory-programmed
and covered with a light-tight lid. So, if enough light leaks around
the lid, the bias of the sense amplifiers changes (and the chip can
become incapable of proper readout).

It's a matter of bleaching out the bias current sources...