Asus P4S333 - Manual (Page 20)

1-8 Chapter 1: Product introduction
Microphone jack. This Mic (pink) jack connects a microphone.
(on audio models only)
Line In jack. This Line In (light blue) jack connects a tape player or
other audio sources.
(on audio models only)
Line Out jack. This Line Out (lime) jack connects a headphone or
a speaker.
(on audio models only)
Serial port. This 9-pin COM1 port is for pointing devices or other
serial devices.
USB ports. These two 4-pin Universal Serial Bus (USB) ports are
available for connecting USB devices such as a mouse and PDA. A
USB header is also available for two additional USB ports.
PS/2 keyboard port. This purple 6-pin connector is for a PS/2
keyboard.
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