SOYO SY-6IBM User's Manual & Technical Reference page 24

Hardware Setup
4. CD Line-in (J4,J5)
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:
CD Line-in : J4,J5
Right
5. Other Display Cards
Insert other types of VGA cards into the PCI or ISA expansion slots
according to card specifications.
All manuals and user guides at all-guides.com
Right
Left
GND
GND
J4
1 2 3 4
GND
GND
Left
J5
1 2 3 4
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SY-6IBM