SOYO SY-5EHM Super 7 User's Manual & Technical Reference page 28

Hardware Setup
Step 10. External Peripherals Connections
External devices such as the keyboard, printer, PS/2 mouse,
modem, USB can be connected to the Mainboard. Normally, you
can not plug your devices directly onto the Mainboard, except for the
keyboard that plugs directly into the back panel KB connector.
For other parallel (PRT1) and serial devices (COM1, COM2), first
install the external connectors that come with your Mainboard on the
computer case, then plug the other end of the flat cable to their
respective connectors.
Only after you have fixed and locked the Mainboard and external
connectors to the computer case can you start connecting the
external peripheral devices.
When connecting an external device, use the following figure to
locate and identify which back panel connector to plug the device or
flat cable to.
*
1
4
2 3 4 5 6
1
25
SY-5EHM/5EH5
PS/2 Mouse
Connector
5
Connector
PRT 1 COM1
1
1
9
USB1
1
COM2
KB