On manual typewriters, the mechanical motions you make directly operate the mechanism which places characters on the paper, and moves the paper and ribbon. On Electrics, your mechanical motions trigger actions usually driven by an electric motor. Electronic typewriters are basically computers, which are pretty dumb to pretty sophisitcated. You pressing keys gets processed by the computer chip which decides on the actions the mechanism must take toachieve. The mechansim on an electronic typewriter is pretty simple, compared to fully mechanical manual and electric typewriters. Sophisticated electronic typwriters may have screens where you can pre-edit text, and even store it.
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