alphanumeric keyboard

Alphanumeric keyboards include typewriters and computer keyboards. An alphanumeric keyboard is a device with many keys (usually marked with the letters of the alphabet, the numerical digits, and various extra keys.) After punch cards and paper tape, interaction via teletype-style keyboards became the main input device for computers. During the 1980s and 1990s almost all computers came equipped with them as the main form of interaction, and most users are familiar with using them. There are different types of  keyboard technologies.
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