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Keyboard Connector (C64)

Employed in: C64 - DOH!

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


Connection scheme

Picture (ASCII version below)

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


[keyboard matrix]

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.


Updated: September 24th, 1997
Created: February 4th, 1997
Status : Verified by Daniel

Site copyright © 1997 by Marc-Jano Knopp
This document is part of MJK's Commodore 64 & LCD Page
Brought back to life by Peter Schepers, Dec 10, 2005 because I really liked this site!