Ps/2 Mouse Conn. Ð Ps/2 Mouse Connector; Prt Ð Parallel Port Connector; J18 Ñ Speaker Connector; Usb1 Ð Universal Serial Bus Connectors - SOYO Pentium 82430 TX P54C User's Manual & Technical Reference

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Hardware Setup
PS/2 Mouse Conn. – PS/2 Mouse Connector
Attach 6-pin male PS/2 mouse cable to this connector to enable PS/2
mouse function.
PS/2 Mouse Connector
Pin Assignment
GND DATA N/A VCC
N/A
CLOCK
PRT – Parallel Port Connector
Attach parallel port cable to this connector.
J18 — Speaker Connector
Attach a 4-pin case-mounted speaker to this connector.
USB1 – Universal Serial Bus Connectors
Attach 9-pin USB cable to these connectors for external USB device.