>> >>When I tried this, I had problems getting the circuit to program correctly. >>I added a jumper that connects the Vdd of the chip to the rest of the >>circuit. When I need to program, I remove the jumper before attaching >>the programmer. This has worked so far. I currently don't have anything >>attached to the programming clock and data pins (RB6,RB7) in my circuit. I do >>have the diode from circuit Vdd to the MCLR pin to protect the rest of the >>circuit while programming. BTW I am using the ITU PIC-1 programmer but if >>your programmer uses serial programming, the same should apply. > >Norm, > >Have you tried reducing or eliminating the 100R resistor (R11 on my ITU >programmer) This might fix you problem and eliminate the need for the Vdd >jumper. This 100R resistor was discussed a month or two ago on the piclist. I'll check, I remember that I did not install one of the resistors but don't remember wich one. I'll see if it was R11. Thanks for the tip. Norm