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ASUS P4B533-E motherboard user guide
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Microphone jack. This Mic (pink) jack connects a microphone. In
6-channel mode, the function of this jack becomes Bass/Center.
(on audio models only)
USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus
(USB) ports are available for connecting USB 2.0 devices.
Serial ports. These two 9-pin COM1/COM2 ports are for pointing
devices or other serial devices.
USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus
(USB) ports are available for connecting USB 2.0 devices.
PS/2 keyboard port. This purple 6-pin connector is for a PS/2
keyboard.
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