Note: Sorry if you have already received this msg -  it bounced back to me,
not sure whether it made it passed my ISP...

I am attempting to program a 12c508, using O Nogueira's ProPic 4.2 S/W and
 Dontronic's DT001 (rev a) H/W with a 18 pin to 8 pin adaptor in the ZIF
 socket.

 I am using  Scott Riders pre-assembled hex file called m508v544.hex, this
 file and the asm code (md508v54.asm) can be obtained from:
 http://aeug.org/~chip/src/modv54.zip, (by the way this is the mod chip
 code for the sony playstation)

 The 2 problems i have encountered are:

 1. When writing the code to the 12c508, ProPic s/w reports the following
 msg "Pic not erased, continue", i click yes to continue.

 2. It then reports the following error "Writing error in mem 0" then
 stops.

 My understanding is that the 12c508 is a OTP device, so not sure as to why
 i'm getting the 'Pic not erased' error and as to the 'mem 0' error, i just
 don't know enough.

 Do these errors point to any particular problem???
 I have tried 3 different 12c508's with the same results incase it was a
 dud pic. I have successfully programmed 16x84's without any problems using
 the same s/w and h/w.

 My experience is only MEL PicBasic and 16x84's as a hobby.

 Yours hoping for answers,

 Andrew McDonald