J20 - Serial Port 2 (Comb); J21, J22, J24 - Audio Extension Card Connector; J28 - Extension Ps/2 Mouse Connector - DTK PAM-0050S User Manual

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3.4.15 J20 - SERIAL PORT 2 (COMB)

J20 is on the right hand side of J19, please refer to Fig. 3a for its location.
Pin 1 is on the up left hand side.
3.4.16 J21, J22, J24 - AUDIO EXTENSION CARD
CONNECTOR
J21, J22, J24 is a 2x20 pins female connector. Plug in the optional Audio
Extension Card into this connector, and the video and audio output will give
from the Audio Extension Card.

3.4.17 J28 - EXTENSION PS/2 MOUSE CONNECTOR

J28 is a five -pin connector with polarity key is located left side of the
power connector J22. It is connected with the PS/2 mouse connector
cable to extend the PS/2 mouse connector to the rear of the system case.
Chapter 3