I've been programming PICs for over 3 years,
I have programmed 12C508A, 12F629, 16F628A, 16F84A, 16F676, 16F873A, 16F877A,
18F2550 and 18F4550 with my JDM.
The problem with this particular PIC is that it was working fine for over 500 rewrite cycles but a simple switchmode step up converter malfunction caused it to fry (not completely).
I still cant figure out why only one bit of all the memory words is fixed to '1'.
Everything erases and writes fine , even the EEPROM.
Is there some type of of "full erase" for PICs ? If yes, how can it be done?
This "fixing" of the bits was caused by a 24v spike so i dont think it can be erased with the normal 13.5v VPP.

I'll just replace it with a new one . . .

Just curious about this behavior of a PIC :-)