>It's worth noting that I've never _seen_ a 2-button PS/2 mouse -- 

	I have two of them .. I could take a picture and send it to
you if you like .. =-)

>I think you're right that it's fixed speed (like the keyboard port,
>no?), but i'm almost certain that it's not spec'd to be input-only.

	The scaling factors, reset commands, and enable/disable commands
must be output to the mouse, since all the hardware which controls this
sort of thing is inside the mouse.

	So yes, it must have output as well.

Cheers,
Phil

--
Phillip F Knaack
Database Programmer, Information Development for Extension Audiences (IDEA)
Iowa State University Extension