Teleprinter

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A teleprinter (teletypewriter, Teletype or TTY for TeleTYpe/TeleTYpewriter) is a now largely obsolete electromechanical typewriter that can be used to communicate typed messages from point to point and point to multipoint over a variety of communications channels that range from a simple electrical connection, such as a pair of wires, to the use of radio and microwave as the transmission medium. They could also serve as a command line user interface to early mainframes and minicomputers, sending typed data to the computer with or without printed output, and printing the response from the computer. Teleprinters are still widely used in the Aviation industry (AFTN and airline teletype system).

The modern descendants of these devices, known as computer terminals, are fully electronic and usually use a display screen instead of a printer. Sometimes, these terminals are referred to as TTYs, although this term more correctly refers to teleprinters. Variations called Telecommunications Devices for the Deaf (TDDs) are still used by the hearing impaired for typed communications over ordinary telephone lines.

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