Asus P4B533-VM User Manual page 22

Line In jack. This Line In (light blue) jack connects a tape player or
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other audio sources. In 6-channel mode, the function of this jack
becomes Rear Speaker Out. (on audio models only)
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Line Out jack. This Line Out (lime) jack connects a headphone or
a speaker. In 6-channel mode, the function of this jack becomes
Rear Speaker Out. (on audio models only)
Microphone jack. This Mic (pink) jack connects a microphone. In
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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
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(USB) ports are available for connecting USB 2.0 devices.
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Video port. This port is for a VGA monitor or other VGA-compatible
devices.
27 Serial port. This 9-pin COM1 port is for pointing devices or other
serial devices.
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USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus
(USB) ports are available for connecting USB 2.0 devices.
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PS/2 keyboard port. This purple 6-pin connector is for a PS/2
keyboard.
1-8 Chapter 1: Product introduction