RESERV Interfacing the Enhanced Parallel Port (EPP).pdf
RESERV Interfacing the Extended Capabilities Parallel Port (ECP).pdf
RESERV Interfacing the serial RS-232 port v5.0.pdf
RESERV Interfacing the Standard Parallel Port (SPP).pdf
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       "The idea that I can be presented with a problem, set out to
        logically solve it with the tools at hand, and wind up with a
        program that could not be legally used because someone else
        followed the same logical steps some years ago and filed for a
        patent on it is horrifying."                 -- John Carmack