I am designing a small ICSP circuit for a 16F84, and I have question. I know I need to isolate or switch the RB6, RB7 and _MCLR lines, but I don't know whether I also need to remove power from all of the I/O circuitry attached to the PIC when the system is in programming mode. If anyone can enlighten me, I would really appreciate it. Tnanks... Ron _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body