Scanjet Music

Popadopolis writes "Hack a day is reporting that HP Scanjets have a hidden ability to play music. According to the article, "The HP ScanJet 3c/4c have a variable speed scan head that is driven by a stepper motor. The Play Tune command can be used to move the head at different frequencies." They also have a video of a scanner playing "Fur Elise.""

TRS-80 click

[The Conductor]

A similar techinique was used by the LeScript word processor in the TRS-80 model 3/4. The cassette relay clicked on the keystroke to simulate typewiter sound. If I remember correctly, the device independent I/O on the model 4 (TRSDOS 6) permitted inserting a filter on the keyboard input so you could click in any program, or insert the click-filter on the serial port and have your Compuserve input click like a TTY. A cool but useless hack.