SCO comp.unix.sco.programmer FAQ. :
Hardware related programming
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How can I write my own device driver for SCO?How can I read or set modem signals on a serial port?How can I directly read or write the parallel port to use it for input or to control my non-printer devices? How can I access to I/O ports or card memory from my program? How can I write directly to the console like I do in DOS?Can UnixWare device drivers be written in C++?