Microsoft MOTHERBOARD USER'S GUIDE PXP43 - Manual (Page 23)

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Installing the Motherboard
Chapter 2: Installing the Motherboard
Connecting I/O Devices
The backplane of the motherboard has the following I/O ports:
PS2 Mouse Use the upper PS/2 port to connect a PS/2 pointing device.
PS2 Keyboard Use the lower PS/2 port to connect a PS/2 keyboard.
Serial Port Use the COM port to connect serial devices such as mice or
(COM) fax/modems.
USB Ports Use the USB ports to connect USB devices.
Audio Ports
LAN Port Connect an RJ-45 jack to the LAN port to connect your
computer to the network.
Use the three audio ports to connect audio devices. The
first jack is for stereo line-in signal.The second jack is for
stereo line-out singal. The third jack is for microphone.