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AT Keyboard Connector
Poly-fuse Over Current Protection
The poly-fuse protects the system from dangerous voltages the system might be
exposed to via the keyboard connector. In case of such exposure, the poly-fuse will
immediately be disconnected from the circuit, just like a normal fuse. After being
disconnected for a certain period of time, the poly-fuse will return to its normal state,
after which the keyboard can function properly. Unlike conventional fuses the poly-
fuse will not have to be replaced, relieving the user wasted time and inconvenience.
Optional USB Kit Connector (CN4) A through C
The USB Kit connector is a combination of of USB, PS/2
mouse, and Infrared functions grouped on the same
connector. The USB Kit is installed in a back panel of
the chassis and is connected to the USB Kit connector
with an 18-pin cable.
A. Infrared Connector
If the IR Address Select function in BIOS's Integrated
Peripherals menu is not set at disabled, the COM2 port
will support IR functions.
Keyboard Connector/Pin Definitions
Pin
Definition
1
Keyboard Clock
2
Keyboard Data
3
(None)
4
Ground
5
+5V DC
Pin
Definition
1
Ir-Tx
2
Ir-Rx
3
Not Connected
4
Vcc (+5V)
5
GND
6
Not Connected
7
Not Connected
8
Not Connected
1
+
1
1
1
+
+
1
1
PS/2 Mouse Port
1
+
1
1
1
+
+
1
1
5agm3-2.p65
2000/4/11, PM 05:50
14
