Asus M4A77D - Manual (Page 31)

Refer to the audio configuration table below for the function of the audio ports in the 2, 4, 6,
or 8-channel configuration.
11. USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are for
USB 2.0 devices.
12. USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports are for USB
2.0 devices.
13. Serial port. This 9-pin COM1 port is for pointing devices or other serial devices.
14. Optical S/PDIF_OUT port. This port connects to an external audio output device via
an optical S/PDIF cable.
15. USB 2.0 ports 5 and 6. These two 4-pin Universal Serial Bus (USB) ports are
available for connecting USB 2.0 devices.
Audio 2, 4, 6, or 8-channel configuration
Ensure the audio device of sound playback is VIA High Definition Audio (the name may
be different based on the OS). Go to Start > Control Panel > Sounds and Audio Devices
> Sound Playback to configure the settings.
Port
Headset
2-channel
4-channel 6-channel 8-channel
Light Blue Line In Line In Line In Line In
Lime Line Out Front Speaker Out Front Speaker Out Front Speaker Out
Pink Mic In Mic In Mic In Mic In
Orange – – Center/Subwoofer Center/Subwoofer
Black – Rear Speaker Out Rear Speaker Out Rear Speaker Out
Gray – – – Side Speaker Out
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