>
> I don't believe that excessive UV can damage the chips. I have
> forgotten to turn off the eraser on Friday night and remembered on
> the following Monday that it was still on. This has happened a
> couple of times and these chips are still functional after hundreds
> more erase program cycles. (Too cheap here to get an ICE).

This situation (which has happed no me too) kinds of begs a question:

Would it be worth the 1/2 day to throw together a timer for the eraser?

A PIC and a relay in a box is all that's required.

BAJ