> Anybody who still uses EPROM PICs, try this on a running JW chip.
>
> Fire off a xenon flash a few feet above it and watch what happens to
> your (previously) running program.
>
> Totally grinds my 16C71 to a halt! WDT does not recover it.
>
> It's the light, by the way. Block the window and you can take as many
> pictures as you want.

This is an old trick. Discovered the hard way by some people who used
8751s in a disco strobe light application, with white paper label on the
window. After a few weeks the program would be very ill.

Peter

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