The port is a standard DE-9 (commonly mis-titled "DB9") male connector, accepting a female controller plug. Viewed from the front of the port: 

      1       5
      o o o o o
       o o o o
       6     9

Pin functions:

Pin numberFunction
1Up
2Down
3Left
4Right
5VCC
6TL
7TH
8Gnd
9TR

The use of these pins depends on the peripheral being used.


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