We have a Warp13a programmer which programs our little PIC16LF84 circuit
beautifully.

However we want to put a serial number on each device to we try to use
David Tait's FPP program with a programmer designed by someone who left
the company.  I am trying to find out why on about 1/3 of the boards the
programming fails on the Data EEprom.  Anybody got any clues?

I see on the scope that the Warp13a has heaps of "rest" between each
write but toggles the clock at a faster rate (100kHz) than the FPP
(32kHz)

I would have gone onto the Forum that I used to solve previous problems
(the pluto.beseen.com/boardroom .... ) but that has gone off line.




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