Keyboard

History

The creation of a computer keyboard typewriter inspired by the creation of a basic design created by Christopher Latham in 1868 and heavily marketed in 1877 by the Remington Company. The first computer keyboard adapted from hole punch cards (punch cards) and long-distance delivery technology writing (Teletype). In 1946 the ENIAC computer using a card reader manufacturer's hole (punched card reader) as a tool masukka and output. Although the development of alternative input devices such as mice, touch screens, pen devices, character recognition and voice recognition, the keyboard remains the most flexible and most often used for direct (human) into the computer. Keyboard typically has characters engraved or printed on each key and press the button is usually a single written symbol. However, to produce some symbols must be pressing and holding several keys simultaneously or sequentially. While the keyboard keys produce letters, numbers or signs (characters), another button or pressing buttons simultaneously can produce actions or computer commands. In normal use, the keyboard is used for entering text and numbers into a word processor editor, text or other programs. In a modern computer, the interpretation is generally left to the software. A computer keyboard distinguishes each physical key from every other and report all keystrokes to control the software. Keyboard is also used for computer games, either with regular keyboards or keyboard that uses special gaming features, which can speed up a key combination that is often used. A keyboard is also used to give commands to the computer's operating system, such as Ctrl-Alt-Delete in Windows, which provides computer task window closes. This is the only way to enter commands on the command line interface.


Types

One of the factors that determine the size of the keyboard is the existence of duplicate keys, such as a separate numeric keyboard, for convenience. In addition, the size of the keyboard depending on the extent to which the system is used to generate action by a combination of buttons simultaneously or the following (with modifier keys), unique or pressing a few buttons. A keyboard with a button called keypad. Another factor that determines the size of the keyboard is the size and spacing of buttons. The reduction is limited by practical considerations that the key must be large enough to be easily pressed with a finger. Or tool used to press a small button.

Standards
Standard alphanumeric keyboard full-travel keys are found in the centers of three-fourths inch (19.05 mm 0.750 inch) and has a travel lock at least 0.150 inches (3.81 mm). Computer keyboard desk, like a traditional keyboard made in the United States or 101-key Windows keyboard 104 keys, including alphabetic characters, numbers and punctuation marks, and various function keys. International keyboard keys are generally 102/105 key has the "shift" on the left are smaller and additional buttons with some symbols in between that and his letters to the right (usually Z or Y). Also usually the "Enter" which is usually shaped differently. Computer keyboard is similar to an electric typewriter keyboard, but contain additional keys. Standard USB keyboard can also be connected to some non-desktop devices.

Size of Laptop
Keyboard on laptop and notebooks usually have a shorter distance to a keystroke and a set of small buttons. This keyboard has no numeric keypad and function keys are placed in a location different from the standard placement in full-size keyboard.

Size of Thumb
Has introduced a small keyboard for laptops (especially nettops), PDAs, smart phones or users who have limited work space. A chording keyer allows multiple keys pressed simultaneously. For example, GKO keyboard is designed for small wireless devices. Another alternative to the two hands which serves to control the game, like AlphaGrip is also used as a means of entering data and text. A "thumb board" (modified) is used in some digital helper such as the Palm Treo and BlackBerry, and some Ultra-Mobile PCs like the OQO. Numeric keypad only contain numbers, mathematical symbols for addition, subtraction, multiplication, and division, decimal point, and some function keys. The keypad is often used to facilitate data entry with smaller keyboard with no numeric keypad, usually on the laptop. This button is known as the numeric keypad or numeric, and can consist of other types of buttons: • arithmetic operators such as +, -, *, / • Figures 0-9 • • Arrow keys cursor navigation keys, such as Home, End, PgUp, PgDown, and others. • Num Lock key, used to enable or disable the numeric keys • The Enter key