Input Devices Definition and Functions

Input Devices Definition and Functions - Is a computer hardware that serves as a tool to enter data or commands into a computer. The input device is a device used to receive input from outside the system, and can be either input or maintenance input signal. In a computer system, signal input of the data entered into the computer system, while maintenance input in the form of programs used to process the data entered. Thus, in addition to input devices used to enter data as well as to enter the program.

Some input devices have dual functionality, which is in addition as input devices also function as output devices at once. Such a tool called a terminal. Terminals can be connected to a computer system by using a direct cable or via a communication device.

Terminals can be classified as non-intelligent terminals, smart terminals, and intelligent terminal. Non-intelligent terminal only serves as a tool to enter the viewer input and output, and can not be programmed because it does not have the processing equipment. Equipment like this is also referred to as a dumb terminal.

The smart terminal has processing devices and memory in it so that input can be corrected already been put back. However, this type of terminal can not be programmed by the user, except by the manufacturer. While intelligent terminal can be programmed by the user.

Equipment which only serves as input devices can be classified as input devices directly and indirectly. Direct input devices that input is entered directly processed by the processing equipment, while the input device indirectly through certain media before any input is processed by the processing equipment.

Tools direct input can be either the keyboard (keyboard), pointing device (eg, mouse, touch screen, light pen, digitizer graphics tablet), scanners (eg, magnetic ink character recognition, optical data is reader or optical character recognition reader), sensors (eg digitizing camera), voice recognizer (eg microphone). 

While the input device is not directly eg keypunch conducted through the medium of punched cards , key-to-tape that records data to the media-shaped tape (tape) before being processed by the processing equipment, and key-to-disk recording data to the media magnetic disk (eg, floppy or hard disk) prior to further processing.

(1) Keyboard
An input device standards required in each PC. These components do not experience rapid growth. Only in the connector in its PCs are experiencing growth. Starting with the XT keyboard, PS2 keyboard, USB keyboard, and a new one are now developing a wireless keyboard.

(2) Mouse
The mouse is a component of manage input is required when using the graphical operating system. Mouse more development from the keyboard.
Halted from a serial mouse, PS / 2 mice, scroll mouse, and when the optical mouse.