This also worked fine until one windy night when I was away from home and it set off the alarm every few minutes. It worked so well I expanded the system to include little tilt switches placed on bushes outside the windows. It displayed a representation of our apartment on the screen and showed when a door or window was open. At one point I designed a home surveillance system for our apartment in Seattle that used little magnetic switches from Radio Shack. I can remember the thrill when I discovered how to input and output signals from the joystick ports. (My wife says that the day it arrived was the happiest she's ever seen me.) Despite its membrane keyboard and TV set monitor, it was loaded with graphics, sound capability, and programming challenges. A couple of months later I was busy programming at home with my own computer, an Atari 400.
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