Internal Sound Connections; Digital Audio Connection - PCchips M748LMRT Manual

If you want to install more IDE devices, you can purchase a second
IDE cable and connect one or two devices to the Secondary IDE
channel connector IDE2 on the mainboard. If you have two devices
on the cable, one must be Master and one must be Slave.

Internal Sound Connections

If you have installed a CD-ROM drive or a DVD drive, you can
connect the sound output of the drive to the built-in sound system.
On the mainboard, locate the two 4-pin connectors for CD1 and
CD2. There are two kinds of connector because different brands of
CD-ROM drive have different kinds of cable connectors on their
audio output cable. Connect the cable to the appropriate connector.
1
J5-Digital
Audio In
Header

Digital Audio Connection

If your CD-ROM or DVD drive has 24-bit digital audio output,
and your system is equipped to output sound through the SPDIF
digital audio connector, you can use an optional internal digital
audio cable to connect the digital output from the drive to the
digital audio input connector on the mainboard.
Note: Do not use the Digital Audio In header, If you have already
installed the optional Digital Audio Extension Bracket.
Install the Processor
CD2
1
1
CD1
25