> Well, pay the man and you'll get your answer > > Think level modulation of the MCLR pin. Maybe a zener or two. Current > modulation for return data. If it's what I'm thinking of then its timing, not level related. You'll have to pay Wouter for the details. ******************************************************************** Olin Lathrop, embedded systems consultant in Littleton Massachusetts (978) 742-9014, olin@embedinc.com, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body