SOYO SY-5SSM User's Manual & Technical Reference page 34

Hardware Setup
4. CD Line-in (CDIN1,CDIN2)
This Motherboard provides two CD-Line in connectors. Please
connect the 4-pin audio cable from your CD-ROM drive to either
CDIN1 or CDIN2. (It fits in only one, depending on the cable that
came with your CD-ROM drive)
Please install according to the following pin assignment:
5. Other Display Cards
Insert other types of VGA cards into the PCI or ISA expansion slots
according to card specifications.
CD Line-in :
CD In1, CDIN2
Left GND GND
1 2 3
GND
Left GND
Right
1 2 3
30
SY-5SSM & SY-5SSM/5 V1.1
Right
CD IN1
4
CD IN2
4