Having spent nearly the last 2 days debugging my 16f877 application I
finally found the problem. I ported code to read/write to the eeprom from a
previous 16f628 application, not realising that you have to specify whether
you are reading the data memory or the program memory with EECON1,EEPGD.
This resulted in the code working fine for 3 months on breadboard, but not
so once installed in a pcb, and the most obtuse bug chase I've ever done.

Hope this is of help to someone...

James

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