More on mouse ports. Most newer computers have a dedicated mouse port. If you're mouse plugs into a little round connecter, it's probably a PS/2 port mouse. (this maybe also be printed on the label on the bottom of the mouse itself.) If your mouse plugs into a D connecter (either 9 or 25 pin), it's a serial mouse (again, it might say this on the mouse label) and plugs into either COM1 or COM2. If you're trying to configure X with the mouse, it probably won't need the IRQ/address info, but normal values are:
COM1 - IRQ4 - 3f8h COM2 - IRQ3 - 2f8h In the Xconfig, you'e select ttys0 (COM1) or ttys1 (COM2) for your mouse port. Or select psaux for a PS2 mouse. Hope that helps.