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Is it supposed to be a full grown keyboard to replace the normal keyboard, or just a extra keypad?
If it's supposed to be a full keyboard then you're going to run into troubles on the software side, native keyboard support is integrated into the bios, so you would have to write your own bios routines and burn them to the pc's flash chip.
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