TRIGEM CW3S20A Operation Manual page 157

Expansion Slots — J2, J4, J6, and J8
on the backplane board
The system backplane board which is connected to 120pin
edge connector contains four expansion slots as follows:
Four 16-bit slots for PC/AT boards or 8-bit PC/XT boards
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Keyboard Port - J4
The keyboard connector J4, is a 5pin DIN connector for
keyboards that are compatible with the IBM AT keyboard.
Parallel Port - J7
Connector J7 on the system board provides a standard
Centronics 25pin parallel interface.
Serial Port - J6
Connector J6 provides the standard AT-type RS-232C
serial interface.
System Mother Board
B-7