Okay, Ive now figured out some stuff. I seem to be able to send
strings of bytes, and receive at least one byte, using only two
PORTA lines on the pic. (Ive added a 5.5K pullup resistor to each).
However, Im having trouble decoding messages sent from the PC.
Namely, status led messages. I have my scope on it, and it
seems the data line is never pulled low from the PC in certain situations.
(Any message which turns off all keyboard leds)
Thanks for any clues, source code, etc.