How do you interface a home·made joystick, stepper motor or a fully fledged robot to your Commodore computer? How do you write software for stepper motor control and how can you use the software and a few penny worth of components to get an output for analogue control? Step by step instructions guide you in constructing a wealth of gadgetry.At the same time you will build an understanding of the principles of digital and analogue input and output.