Hi Ed, My MegaMax programmer maybe similar to your TopMax programmer, and I have to manually tell it to program the config fuses. Even if I hit the "Auto" button, it programs an verifies OK but does not program the config bits untill I tell it to. Try it in the circuit and it just doesn't do anything, go back to the programmer and burn the config fuses and it's all go! This has caught me out heaps of times, usually when I have been programming 8051's for ages and forget what I have to do with PICs. I have nominated it to go on the 100 factoids about PICs list. Brent Brown Electronic Design Solutions 16 English Street Hamilton, New Zealand Ph/fax: +64 7 849 0069 Mobile/text: 025 334 069 eMail: brent.brown@clear.net.nz -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.