Dave Johnson wrote:

>>Yes, it matters, and the answer is BOTH!
>Why? Aren't they connected internally? Inquiring minds want to know :-)
An update on this: I went ahead and built the cable using only the Vdd
and Vss pair that are the same on both the 16F877 and the 16C774 (pins 31
and 32 on the DIP package), and it works just fine. Again, these are the
pins I brought out of the programmer (PicStart+): on the board, of
course, these pins are also connected to the other pair.

I'm not using LVP, either, I need RB3 for my own devious purposes :-)

Dave Johnson