Alphanumeric keyboard
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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.)
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[edit] Computer Keyboards
After punch cards and paper tape, interaction via teletype-style keyboards became the main input device for computers. During the 1980's and 1990's 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.
The most popular Keyboard layout/layout of keys on the modern-day English language keyboard is called the QWERTY design, based on the most popular typewriter keyboard layout further extended to the standard 104-key Personal computer/PC keyboard layout, with the addition of cursor keys, a calculator-style numeric keypad, two groups of special Function engineering keys, a key for the Windows key/Windows Start menu (on IBM and Clone (computing clones), and other modifier keys. Some computer manufacturers have added keys specifically related to the Internet and e-mail, but these have not become standard. A few other keyboards may include: Dvorak Simplified Keyboard, ABCDEFG layout, etc.
The fastest typists (as of 2007) use a stenograph, a kind of chorded keyboard used by most court reporters and closed-caption reporters.
Despite the development of alternative input devices, such as the mouse (computing mouse), touch sensitive screens, pen devices, character recognition, voice recognition, and improvements in computer speed and memory size, the keyboard remains the most commonly used and most versatile device used for direct (humaninput) into computers.
