ECS Motherboard User Manual page 45

Internal Sound Connections
If you have installed a CD-ROM drive or DVD-ROM drive, you
can connect the drive audio cable to the onboard sound system.
1
CD 1
When you first start up your system, the BIOS should automati-
cally detect your CD-ROM/DVD drive. If it doesn't, enter the
Setup Utility and configure the CD-ROM/DVD drive that you
have installed. On the motherboard, locate the 4-pin header CD1.
Chapter 2: Motherboard Installation
Pin Signal
1 CD IN L
2 GND
3 GND
4 CD IN R
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