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Apple QuickTime movie  |  1994-06-26  |  3.4 MB  |  320x240  |  15fps  |  25 seconds  |  [MooV/TVOD]
Transcription: A keyboard is a collection of switches. There's one beneath each key. Inside the keyboard, a microprocessor monitors the state of every switch. When you press a key, its switch closes, generating a signal. The keyboard's microprocessor interprets the signal and transmits a code to the Mac. The Mac's system software translates the code into the character that's assigned to it.