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. Check dis shit out, babee! :^)
ScanJetPlay requires libsane and libsanei (for SCSI access) from the SANE backends package. Note that libsanei and its header files is not installed per default, and must be done manually.
Video here...
http://www.ghana-projects.de/scanjet-elise2.mpg
This just sounds so cool ... :)
