> For > readback, the target chip PGD is connected thru another 2Kohm > resistor to > the comparator input of the controller PIC. Which value do you put on the other input of the comparator? I hope you do switch the programmer-PIC output that drives the PGD line to input? Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body