Asus P4BGL-VM - Manual (Page 22)

1-8 Chapter 1: Product introduction
USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus
(USB) ports are available for connecting USB 2.0 devices.
Video port. This port is for a VGA monitor or other VGA-compatible
devices.
Serial port. This 9-pin COM1 port is 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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