[bobsterlobster]

Your hunch is correct, I did not test the PS/2, serial or parallel ports, and I'm only using USB.

[toast0]

Might be worth trying the ps/2 port, if you've got something that fits it.

Or loopback on the serial port; just have to enable it in BIOS, don't need a connector or a serial device.

[bobsterlobster]

Will do. Might be worth to look into it a little deeper.