well if u really want to make it parralle....
hi, what i suggest if u really want to have it paralle.... is to use a uart to get the serial code send by the keyboard (8 data bit odd parity one stop bits),the uart will give u a paralle data...but the thing is that the keyboard sends scan code not the ASCII ...so u'll need to decode the scan code and make it ASCII...but if u attend to have only 0-15 extra buttoms.... i sugest u use a keypad with a keypad encode that has a 4x4 matrix
have fun :roll: