> It works, from first time, on various 877 boards. > Do you try a smaller one on 16F628...? The 16F62x can no read/write its own code memory, so it can not use a bootloader. But WLoader should work on all 16F87x. I tried it succesfully on a 16F871 (40 pin, 2 K code). But of course a 1K bootloader is a bit large for a 2K device.... Wouter van Ooijen Van Ooijen Technische Informatica: http://www.voti.nl Jal compiler for PIC uC's: http://www.xs4all.nl/~wf/wouter/pic/jal -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body