This appendix contains the keyboard interface specification for A1000,
A500, A2000 and A3000.

The keyboard plugs into the Amiga computer via a cable with four
 primary connections .  the four wires provide 5-volt power, ground, and
signals called KCLK (keyboard clock) and KDAT (keyboard data).  KCLK is
unidirectional and always driven by the keyboard; KDAT is driven by both
the keyboard and the computer.  Both signals are open-collector; there are
pullup resistors in both the keyboard (inside the keyboard microprocessor)
and the computer.

 keyboard communications      reset warning 
 keycodes                     hard reset 
 caps lock key                matrix table 
 out-of-sync condition        special codes 
 power-up sequence