See all articles from SIN n14 Feb-Mar 1987
The principle of an alarm system is as simple as that of a switch: the classic open circuit or closed circuit. This principle is similar to the famous joystick, which is nothing more than a set of switches. Since the 2068 has two joystick ports, and each port has five individual inputs (up, down, left, right, fire), you can control up to 10 doors or windows, for example.