We’ve placed a video showing the process below the break. This isn’t the first light pen we’ve seen, they can even be connected to modern computers, too.

The film showcases the innovative work of engineers at Bell Telephone Laboratories as they explore computer graphics and its applications in designing electronic circuits. Using a device called ...

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.