Computer Keyboard

Definition

Keyboard is a input device used by the computer operator to interact with the computer. A keyboard contains alpha-numeric, numeric and some special characters. Keyboard is considered as the best input device for the computer.

History Of Computer Keyboard

The computer keyboards are generated from the typewriters. Christopher Latham Sholes patented the typewriter in 1868 and in 1877 Remington Company marketed it.
With the technological advancement the puchcard system, telegraph sytem and typewriter combined to form the keypunches. The first ENIAC computer in 1945 uses punched card reader for input and output.
But the electromechenical steps in the keypunches slow down the data transmision rate.But with the VDT technology data tranmission rate improved by making direct transmision.As the technology advances the typewriter combined with other technologies to develope the current keyboard devices.

Keyboard Layout

The keyboard layout remain same from 1868 as layout of typewriter. The extra keystrokes are added for more functionality.

Working

The current keyboard act as a small computer. They contains there own proccessor with key matrix circuitry. The proccessor of the keyboard contains the read only memory to compaire and read the keystrokes and Key matrix is the character map layout of the keyboard which can be different from actual keyboard. These different layouts are used to convert the keystrokes into different language characters. When we press a key on keyboard we actually press a switch to complete the circuit such that a small amount of current flow through the circuit. The proccessor of the keyboard recogonise the current and maps the keystrokes on the key matrix in its Read Only Memory.

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