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 directly with the A4000. An
adapter to translate
        the keycodes is necessary.