User guide
7. Optical drive audio in connector (4-pin CD)
This connector allows you to receive stereo audio input from sound sources such as a
CD-ROM, TV tuner, or MPEG card.
CD
Left Audio Channel
GND
GND
Right Audio Channel
M4A78 PLUS
M4A78 PLUS Internal audio connector
8. Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) ports.
SPDIF_OUT
+5V
SPDIFOUT
GND
M4A78 PLUS
M4A78 PLUS Digital audio connector
Ensure that the audio device of Sound playback is Realtek High Denition Audio (the
name may be different based on the OS). Go to Start > Control Panel > Sounds and
Audio Devices > Sound Playback to congure the setting.
The S/PDIF module is purchased separately.
9. LPT connector
The LPT (Line Printing Terminal) connector supports devices such as a printer. LPT
standardizes as IEEE 1284, which is the parallel port interface on IBM PC-compatible
computers.
M4A78 PLUS
M4A78 PLUS Parallel Port Connector
PIN 1
LPT
STB#
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
ACK#
BUSY
PE
SLCT
AFD
ERR#
INIT#
SLIN#
GND
GND
GND
GND
GND
GND
GND
GND
1-28 ASUS M4A78 PLUS