Keyboard Connector (C64)

Connection for emergency input system, in case that voice control does not work. You can also connect a C128D keyboard here.

Connection scheme

ASCII version:

  __________________________________________________________
  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  .  o
  ----------------------------------------------------------

 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1


  Pin | Portbit | CIA pin | Function
  ----+---------+---------+---------------------------------
   13 | PA0     | 2       | column #0 / joystick #2 up
   19 | PA1     | 3       |        #1 /          #2 down
   18 | PA2     | 4       |        #2 /          #2 left
   17 | PA3     | 5       |        #3 /          #2 right
   16 | PA4     | 6       |        #4 /          #2 fire
   15 | PA5     | 7       |        #5                     
   14 | PA6     | 8       |        #6 / "1" -> paddle set A
   20 | PA7     | 9       |        #7 / "1" -> paddle set B
   12 | PB0     | 10      | row    #0 / joystick #1 up    
   11 | PB1     | 11      |        #1 /          #1 down       
   10 | PB2     | 12      |        #2 /          #1 left  
    5 | PB3     | 13      |        #3 /          #1 right 
    8 | PB4     | 14      |        #4 /          #1 fire  
    7 | PB5     | 15      |        #5                      
    6 | PB6     | 16      |        #6
    9 | PB7     | 17      |        #7

    1 | -       | -       | GND
    2 | -       | -       | N.C. (polarity mark)
    3 | -       | -       | RESTORE key
    4 | -       | -       | +5V

Note: The RESTORE key is not part of the matrix, but simply connects the restore pin to ground, which triggers an NMI. The SHIFT LOCK key shortcuts the left SHIFT key.

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