29Microphone jack. This Mic (pink) jack connects a microphone. In 6-channel mode, the function of this jack becomes Bass/Center. (on audio models only)

30USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are available for connecting USB 2.0 devices.

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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.

33PS/2 keyboard port. This purple 6-pin connector is for a PS/2 keyboard.

ASUS P4B533-E motherboard user guide

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