Abit IT5A User Manual page 17

Installing the Mainboard
The "keylock switch" is used to lock the computer's keyboard.
This disables the keyboard so that unauthorized persons cannot use it.
When this function is in use, you will need to use the unlock key to
activate the keyboard.
PN1 - Power ON/OFF switch
There is no specific orientation. Since most cases do not support this feature, most
of you should ignore this instruction.
Pin number
8
9
PN2 - SMI Switch
There is no specific orientation.
connector pins on the mainboard.
most of you should ignore this instruction.
necessary as it is already a part of the mainboard.
Pin number
10
11
PN2 - HDD LED connector
This connector has a specific orientation.
connector cable attached to the case to the IDE LED connector on the mainboard.
Pin number
6
7
PN1 - Speaker connector
There is no specific orientation.
PN1 connector pins on the mainboard.
Pin number
4
5
6
7
Name or significance of the signal
Ground
Power on/off signal
Name or significance of signal
SMI signal
GND
Name or significance of signal
LED's Cathode
LED's Anode
Name or significance of signal
+5VDC
Ground
Ground
Sound Signal
Connect the two-thread cable to the PN1
Since most cases do not support this feature,
Furthermore, this feature is not
Connect the two-thread IDE LED
Connect the four-thread speaker cable to the
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