Home » INPUT AND OUTPUT DEVICES » INPUT UNIT AND ITS FUNCTION

INPUT UNIT AND ITS FUNCTION

DEFINITION OF INPUT UNIT

Data and instruction must enter the computer system before any computation can be performed on the supplied data. This task is performed by the input unit of the computer that links the external environment with computer system. Data and instruction enter input unit in forms that depend on the particular device used. For example, data is entered from a keyboard in a manner similar to typing, and this differ from the way in which data  is entered through a card reader which is other type of input device. However regardless of the form in which they receives their inputs, all input devices must provide a computer system with data that are transformed into the binary codes that the primary memory of the computer is designed to accept. The transformation is accomplished by units called input interfaces. Input interfaces are designed to match the unique physical or electrical characteristic of input device to the requirement of the computer system.

FUNCTIONS PROVIDED BY INPUT UNIT

  • It reads the list of instruction and data from the outside world.
  • It converts these instructions and data in the computer acceptable form.
  • It supplies the converted instructions and data to the computer system for further processing.
Example of input unit are Keyboard, mouse, scanner, plotter, memory card etc.

Related Posts

  • OUTPUT UNIT OF A COMPUTEROUTPUT UNIT OF A COMPUTER The work of an output unit of a computer is just the reverse of that of an input unit of a computer. It supplies information and result of computation to the outside of world. […] Posted in INPUT AND OUTPUT DEVICES
  • MACHINE LANGUAGEMACHINE LANGUAGE INTRODUCTION OF COMPUTER MACHINE LANGUAGE Computers can be programmed to understand many different computer languages. But there is only one language which does not require any translator […] Posted in INTRODUCTION TO COMPUTER
  • STORAGE UNIT AND ITS USAGESSTORAGE UNIT AND ITS USAGES The data and instruction that are entered into a computer system through the input units have to be stored inside the computer before the actual processing starts. Similarly, the results […] Posted in BASIC COMPUTER ORGANIZATION
  • NETWORK TOPOLOGYNETWORK TOPOLOGY Before I start discussion on different network topology we should be familiar with computer network. A network is an interconnected group or system of computers and other devices […] Posted in NETWORKING AND DATA COMMUNICATIONS