It allows him to make engineering drawings with a light pen. A typical minicomputer costs ... three now common computer applications. Gordon Moore and Robert Noyce found Intel in 1968.

Keywords computer graphics, Bell Telephone Laboratories, Graphic 1, circuit design, electronic light pen, programming, visual representation, communication satellites, sound waves, artistic ...

A light-sensitive stylus wired to a video terminal used to draw pictures or select menu options. The user brings the pen to the desired point on screen and presses the pen button to make contact.

That’s the question [Kathy] asked when she built this LED matrix light pen project. It looks simple enough – a 64-LED matrix illuminates as the pen draws shapes. But how does the circuit ...