SOYO SY-5SSM User's Manual & Technical Reference page 30

Hardware Setup
Step 9. Back Panel Connections
All external devices such as the keyboard, printer, PS/2 mouse,
modem, USB, monitor, joystick and audio devices (speakers/
headphones, microphone and CD/cassette player) can be plugged
directly onto the Motherboard back panel.
Only after you have fixed and locked the Motherboard 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 to.
PS/2 Mouse
Connector
PS/2 KB
Connector
1. Onboard Serial Port COM1
External peripherals that use serial transmission scheme include:
serial mouse,
-
SY-5SSM & SY-5SSM/5 V1.1
PRT
USB2
USB1 USB1 COM1
26
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JOYSTICK
LINE-IN
VGA
LINE-OUT
MIC JACK