Well, it didn't work. The basic premise is that you use HT to send & receive throught the com port. Short pins 2 & 3 (send & receive) & you should see your typing on the screen. I couldn't get it to work, on either COM1 or COM2.
I have XP Home, and an M10k mobo. BIOS says they're enabled, Device Manager says they're working.
EDIT: I got it to work. I had to say for Flow control = None (default is "Hardware".
Groovy.
Frodo, if you have the test proggie, I could still use it in a couple weeks when I finish troubleshooting all my wiring.