Ancient Dragon
Retired & Loving It
30,049 posts since Aug 2005
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Look at MSDN under CreateFile() and there is a link to serial port communications discussions. Your program can not access the serial ports directly as they could in the days of ancient MS-DOS. Since you have a choice of either assembly or C, then write it in C would be a lot easier.
Ancient Dragon
Retired & Loving It
30,049 posts since Aug 2005
Reputation Points: 5,662
Solved Threads: 2,343