The Commodore 64 computer is a milestone in computer development. It offers substantial computational power and great versatility at a price everyone can easily afford. Thus it has found a wide range of applications, from games
to scientific programming. There is, however, a vast class of applications which remains to a large degree unexplored: Interfacing the 64 to the real world so that it can sense and control physical processes.

This book and its predecessor, the "VIC-20 Interfacing Blue Book" address this problem from a practical point of view: Useful interfacing projects are defined, their theory of operation is explained and then information is given on
how to build and program them.