Keyboard Port (6-Pin Female Mini-DIN, PS/2 Type)

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  Pin 1: Data                                             6  ---  5
  Pin 2: Unused                         Pin Layout:         |   |
  Pin 3: Ground                         (Index key          |   |
  Pin 4: +5V (100 mA maximum.)          at top.)        4    ---    3
  Pin 5: Clock
  Pin 6: Unused                                             2   1

  Note: A PS/2 keyboard will not work with the A4000.