I got my NESp working (hooray! Kirby and Little Nemo look wonderful!), but now all that's working on my D-pad is the down button. I'm wondering if anyone else has had this problem. All my wiring is up to par with what's in the book, with some "flubbing" done on my part because of the afforementioned defeciencies in the proof reading (which I fixed by referring to previous chapters and comparing pin-outs).
I know it's possible I got some bad buttons from Digi-key, but 3 out of 8? That's a load of BS.
Actually, I've had that happen before, but it was when I was working on an NES VR controller. I think there was a wire going to the wrong place, or maybe it was a connection missing. But I've had that problem, and it's caused by one of those two. I hope that will help.