I had a few 12c509's that had the die off-centered in them and couldn't
figure out why they wouldn't erase until I changed their orientation in the
chip eraser.

----- Original Message -----
From: "Chris Pringle" <cpringle@LATRIGG.DEMON.CO.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, May 24, 2000 8:26 AM
Subject: PIC Won't erase


Hi All,

I have a PIC16C64B, which is supposed to be UV erasable. I have tried
sticking it under a UV lamp for 30 minutes, but there seems to be no
corruption or any signs that the chip has been erased. The HEX code looks
exactly as it was when I programmed it. Does anyone know how long the chip
must stay in UV light? The UV light box I am using, is actually meant for
developing PCB's, but I'm have been told, it has been used to erase EPROMS.

Regards
Chris Pringle