> When I first had trouble and went poking around, I found Microchip's > note about RB3 and LVP (and then read much of the voluminous > discussion about it in the PICList archives :-). I assumed that was > my problem, so I temporarily tied RB3 to Vss on the board though 10K, > just for programming. It didn't seem to change anything. Shouldn't that be Vdd to disable LVP? In the past I programmed some F877's wothout problems without connecting RB3 to anything, but with F628's (RB4!) this worked erratic. So always tie the LVP-enable pin low while using HVP. Wouter van Ooijen van Ooijen Technische Informatica: http://www.xs4all.nl/~wf/ Jal compiler for PIC microcontrollers: http://www.xs4all.nl/~wf/wouter/jal -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body