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keyboard

A keyboard is the set of typewriter-like keys that enables you to enter data into a computer or other devices. Computer keyboards are similar to electric-typewriters but contain additional typing keys.

Standard Key Classification

The standard selection of keys typically found on computer keyboards can be classified as follows:

  • Alphanumeric keys: The standard letters and numbers.
  • Punctuation keys: The comma, period, semicolon, and similiar keys.
  • Special keys: This includes the function keys, control keys, arrow keys, caps Lock key, and so on.
  • QWERTY, AZERTY, Dvorak and Other Keyboards

    The standard layout of letters, numbers, and punctuation is known as a QWERTY keyboard because the first six typing keys on the top row of letters spell QWERTY. The QWERTY keyboard was designed in the 1800s for mechanical typewriters. This layout was actually designed to slow typists down to avoid jamming the keys on mechanical units.

    Keyboard diagram

    The AZERTY keyboard is the French version of the standard QWERTY keyboard. AZERTY keyboards differ slightly from the QWERTY keyboard. For example, the Q and W keys have been interchanged with the A and Z keys.

    Another well-known design is the Dvorak keyboard, which has letters positioned for speed typing. Unlike the traditional QWERTY, the Dvorak is designed so that the middle row of keys includes the most commonly used letters in the alphabet.

    Is There a Standard Computer Keyboard?

    There is no standard computer keyboard, although many manufacturers imitate the keyboards of PCs. There are actually three different PC keyboards: the original PC keyboard, with 84 keys; the AT keyboard, also with 84 keys; and the enhanced keyboard, with 101 keys. The three differ somewhat in the placement of function keys, the Control key, the Return key, and the Shift keys.

    In addition to these keys, keyboards usually contain the following keys: Page Up, Page Down, Home, End, Insert, Pause, Num Lock, Scroll Lock, Break, Caps Lock, Print Screen.

    Apple Macintosh Keyboard

    There are several different types of keyboards for the Apple Macintosh. All are called ADB keyboards because they connect to the Apple Desktop bus (ADB). The two main varieties of Macintosh keyboards are the standard keyboard and the extended keyboard, which features 15 additional special-function keys.

    KALQ for Touchscreen Devices

    Keeping with the times and the popularity of smartphones, tablets and other small computing devices, gesture-based keyboards are often the most popular choice for mobile computing devices. A new layout, called KALQ has been designed by researchers from Max Planck Institute of Informatics, Montana Tech and University of St.Andrews. KALQ is optimized for rapid two thumb typing on touchscreen devices.

    KALQ keyboard

    Even More Keyboards

    • Capacitive: This keyboard uses changes in capacitance to register when a user has depressed a key.
    • Chiclet: Features elevated keys that have some space between them in a design that is rectangular in shape with rounded edges.
    • Gaming: Features additional programmable keys, macro functions or digital displays for use in computer games. They are usually backlit and are more robust: mechanical switches and laser-etched keys for durability.
    • Membrane: The keys are covered by a transparent, plastic shell. Often found in medical facilities.
    • Multimedia: A computer keyboard that contains additional keys and buttons for media options such as volume, brightness and video controls.
    • On-Screen: An application which provides a visual keyboard on your display screen that can be used in place of a physical keyboard.
    • Virtual keyboard: A full-size image of a QWERTY keyboard is projected onto any surface.
    • Wedge: Hardware or software that interfaces with a computer to translate data read by a device other than a keyboard, such as a magnetic strip or bar code reader.






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