Michael Curtis wrote: > Further testing reveals this: using either pikdev or picprg seem to > mess up the chip so that it can no longer be programmed. The chip > needs a complete reset (power off, wait 30s, power on) before it will > behave itself, only prog84 will then talk to it. As these programs > previously worked, I'm guessing that these two are allowing my program > to briefly start* before going into program mode, which causes the > hardware to act "strange". Is this even possible? I'll test by > reflashing the chip tomorrow but it's late downunder now. Are you remembering to hold the PGM pin low during high voltage programming? ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist