In a message dated 03/12/97 14:03:52, you write: << Hello! I would really be gratefull if anyone of you guys could answer the following two question please? oK 1) When you program a PIC with two Vdd pins and two Vss pins, do they both need to be connected? YES 2) Still when programming a PIC, what will happen if any of the I/O pins is connected to ground? nothing when MCLR is at VPP all pins are configured as inputs the same as at power up. Long live the PIC!! Here Here and the Goat......(minor humor attack) :-) >> Cheers Steve...........