Asus Motherboard A8N-SLI SE - Manual (Page 44)

2-20 Chapter 2: Hardware information
10. PS/2 keyboard port (purple). This port is for a PS/2 keyboard.
Audio 2, 4, or 6-channel configuration
Light Blue Line In Rear Speaker Out Rear Speaker Out
Lime Line Out Front Speaker Out Front Speaker Out
Pink Mic In Mic In Center/Subwoofer
Port Headset 4-channel 6-channel
2-channel
Refer to the audio configuration table below for the function of the audio
ports in 2, 4, or 6-channel configuration.