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I would like to snoop all the signals on that COM port while the software is working in hopes of finding out exactly how to initialize the hardware and what it spits back when functioning.

This is precisely what I did to fix most of the port initialization bugs in the win32 version of UPLOAD.EXE for my logo editor. The serial port snooper program I used for that is now one of my "must have" utilities.

The utility you want is portmon.

Ah, good old sysinternals.


Yeah, portmon is the beast! Used it to figure out the protocol that our autoloading cd duplicator uses at work....

There was no way that I was going to sit there and rip all my cd's to mp3 by hand, so I figured I may as well get some (unintended) use from the cd duplicator! Worked a treat.