imre: >cable (20 cm). Did the programming spec perhaps change? Any ideas? have not suffered from any problems myself, but am not using the same setup. might be worth checking the faq to see if you are doing anything suspect with your connections (thinking of the nasty rb3 problem for instance). the faq: http://www.piclist.com/techref/microchip/index.htm stuff about rb3 ("Can't program 16f8xx in traditional high voltage programmer?" from faq): http://www.piclist.com/techref/microchip/index.htm some misleading stuff I wrote a while back ("Programming modes" from faq): http://www.piclist.com/techref/microchip/16F877/progmodes.htm hope this helps, Simon p.s. could be that no one answered because the subject was a bit misleading ? -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics