Abit AX5 Instruction Booklet page 25

Installing the Mainboard
Mechanics of Mouse/Keyboard/USB/COM1/COM2/LPT
Mouse - PS/2 Mouse connector Watch the pin number and the orientation
his has a specific orientation. Connect the six-threads PS/2 Mouse cable
T
provided to the connector on the mainboard.
Pin number
1
2
3
4
5
6
The "PS/2 Mouse Port" is different from COM1 or COM2 serial
Computer
ports to which you can also connect a Mouse. This mainboard
knowledge
features an extra PS/2 Mouse port, so when you buy a mouse,
be sure that it is a PS/2 Mouse before connecting it to this port.
But if you cannot find any PS/2 Mouse, you can still use COM1
or COM2 to connect a serial mouse to your computer.
Keyboard - PS/2 Keyboard Connector
Name of the signal or signification
Mouse data
No connection
Ground
+5VDC
Ground
Mouse clock
(AX5)
2-9
(AX5)