Component of Digital Computer System

Inroduction

System is the group of computer parts that are integrated for the purpose of achieving objectives like processing of  data, pictures, sound and graphics & can solve highly complicated problems quickly and accurately. Computer is a group of integrated parts that have a common purpose of performing the operations called program, which can help to run computer system smoothly. Various computer peripherals connected to do some work called computer system.

Input Unit
Computers need to receive data and instruction in order to solve any problem. Therefore we need to input the data and instructions into the computers. The input unit consists of one or more input devices. Keyboard is the one of the most commonly used input device. Other commonly used input devices are the mouse, floppy disk drive, magnetic tape, etc. All the input devices perform the following functions:

• Accept the data and instructions from the outside world.
• Convert it to a form that the computer can understand.
• Supply the converted data to the computer system for further processing. 

Output Unit
The output unit of a computer provides the information and results of a computation to outside world. Printers, Visual Display Unit (VDU) are the commonly used output devices. Previously CRT monitor was used as VDU, now-a-days LCD monitors are widely in practice. Other commonly used output devices are floppy disk drive, hard disk drive, and magnetic tape drive.