Saturday March 02, 2024

Scanner Playing Fur Elise
  Posted by: AceBHound on Jan 11th, 2006 1:30 PM
I'm amazed at some of the hardware hacks that people come up with. Here's an interesting one that has an HP ScanJet 4c playing Fűr Elise. Not surprisingly, HP didn't document this as being a feature of the scanner.. I wonder why? :)

That's right. The HP ScanJet 4c's SCL (Scanner Control Language) command set includes an unofficial PLAY TUNE command. I stumbled across this after reading an article on the ScanJet 4c in the feb. 1997 issue of HP Journal (see the sidebar Sing to Me). The PLAY TUNE command basically varies the stepping rate of the scanner motor to produce audible frequencies. All it needs is a series of note frequencies and durations previously written to its SCSI buffer. The ScanJetPlay utility resulted from my efforts in trying out this easter egg.

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