wow, got a lot of helpful replies. thansk everybody. the portmon program i can't use in msdos, only in win9x or higher, and i'm not totally sure how to redirect the i/o through the ::SerialPort modules, but the split cable might do the trick!

thanks again for all the suggestions.

In reply to Re: Listening to I/O on serial port... by Anonymous Monk
in thread Listening to I/O on serial port... by Anonymous Monk

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