Abit AR5 User Manual page 15

Installing the Mainboard
J1 - 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 J1 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
knowledge
ports to which you can also connect a Mouse. This mainboard
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.
J2 - PS/2 Keyboard Connector
This has an orientation pin. Connect your keyboard connector to the J2
connector on the mainboard.
Pin number
1
2
3
4
5
6
Name of the signal or signification
Mouse data
No connection
Ground
+5VDC
Ground
Mouse clock
Name of the signal or signification
Keyboard data
No connection
Ground
+5VDC
Ground
Keyboard clock
2-7