Mouse Port (mini DIN 9 pin)

  _   _
 /  --  \
/ 9 8  7 \
|6 5  4 3|     (Female)
 -|2  1|-
   ----


PIN       SIGNAL

1......+5v
2......X-A
3......X-B
4......Y-A
5......Y-B
6......Button 1
7......Button 2
8......Button 3
9......GND

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Input / Output