Hello

        Does anyone know where I can find a good set of instructions for
implementing serial, RS232 and parallel communications for PIC to PC.  I
am also looking for a circuit to connect a keypad to a pic.  Finally I
would like to what the best method would be to use all 15 of the codes
from a four bit number.  For example if a four bit number is put on
portA: 1000 = function one, 1100 = function two, 1110 = function three
(RA3,2,1,0).

Scott