For some reason I'm unable to erase my PIC16C74A.  I've got a Datarase II 4
chip UV eraser, which has been working fine, and the Microchip umm...
quickstart or something programmer.  Suddenly, today, I find that when the
chips come out of the eraser, the programming software I'm using
(MPS16C.EXE) reports that the chip is not blank.  Any ideas on how I could
have fried the chips?

---
Unknown