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Telex_machine_ASR-32A global teleprinter network, called the Telex network, was established in the 1920s, and was used through most of the 20th century for business communications. The main difference from a standard teleprinter is that telex includes a routing network, originally based on pulse-telephone dialing. Telex is still in use for certain applications such as shipping, news, weather reporting and military command. Some business applications are moving to the Internet.

Teleprinters were also used as the first interactive computer terminals, which had no display. The paper tape function was sometimes used to prepare input for the computer session offline, or to capture computer output.

In computing, especially under Unix and Unix-like operating systems, a teletypewriter is also a name for an external console device, like a user dialing in to the system, or a modem on a serial port. Such devices have the prefix tty, such as /dev/tty13.

Image http://en.wikipedia.org/wiki/File:Telex_machine_ASR-32.jpg

Licensed under the GNU Free Documentation License. It uses materials from the Wikipedia.

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