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  2. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    In early cell phones, or feature phones, the letters on the keys are used for text entry tasks such as text messaging, entering names in the phone book, and browsing the web. To compensate for the smaller number of keys, phones used multi-tap and later predictive text processing to speed up the process.

  3. Keypad - Wikipedia

    en.wikipedia.org/wiki/Keypad

    A 16-key keypad uses a 4 × 4 array of 4 I/O lines as outputs and 4 as inputs. A circuit is completed between an output and an input when a key is pressed. Each individual keypress creates a unique signal for the host. If required, and if the processor allows, two keys can be pressed at the same time without ambiguity.

  4. List of mechanical keyboards - Wikipedia

    en.wikipedia.org/wiki/List_of_mechanical_keyboards

    Mechanical keyboards (or mechanical-switch keyboards) are computer keyboards which have an individual switch for each key. The following table is a compilation list of mechanical keyboard models, brands, and series:

  5. Mobile phone feature - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_feature

    Key pad of a Nokia 3720. Besides the number keypad and buttons for accepting and declining calls (typically from left to right and coloured green and red respectively), button mobile phones commonly feature two option keys, one to the left and one to the right, and a four-directional D-pad which may feature a center button which acts in resemblance to an "Enter" and "OK" button.

  6. Keyboard layout - Wikipedia

    en.wikipedia.org/wiki/Keyboard_layout

    A typical 105-key computer keyboard, consisting of sections with different types of keys. A computer keyboard consists of alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, [1] navigation keys for moving the text cursor on the screen, function keys and system command keys—such as Esc and Break—for special actions, and often a numeric keypad ...

  7. Keyboard technology - Wikipedia

    en.wikipedia.org/wiki/Keyboard_technology

    Almost all keyboards have only the switch (but no diode) at each intersection, which causes "ghost keys" and "key jamming" when multiple keys are pressed . Certain, often more expensive, keyboards have a diode between each intersection, allowing the keyboard microcontroller to accurately sense any number of simultaneous keys being pressed ...

  8. List of keyboard switches - Wikipedia

    en.wikipedia.org/wiki/List_of_keyboard_switches

    2 Mechanical keyboard switches for custom keyboards. 3 Future. 4 References. ... Key stroke lifespan Drop x Invyr Kailh Holy Panda [22] MX Type stem Tactile N/A 67 g

  9. Handsfree - Wikipedia

    en.wikipedia.org/wiki/Handsfree

    Hands-free phone kit fitted to a Saab 9-5.. Handsfree is an adjective describing equipment that can be used without the use of hands (for example via voice commands) or, in a wider sense, equipment which needs only limited use of hands, or for which the controls are positioned so that the hand can occupy themselves with another task (such as driving) without needing to hunt far afield for the ...

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