Asus M4A78L-M - Manual (Page 41)

9. Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port.
Ensure that 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 setting.
The S/PDIF module is purchased separately.
SPDIF_OUT
+5
V
SPDIFOU
T
GND
M4A78L-M
M4A78L-M Digital audio connector
10. Serial port connector (10-1 pin COM1)
The connector is for a serial (COM) port. Connect the serial port module cable to the
connector, then install the module to a slot opening at the back of the system chassis.
The serial port bracket (COM1) is purchased separately.
M4A78L-M
M4A78L-M Serial port (COM1) connector
PIN 1
COM1
ASUS M4A78L-M 1-29