Computer System

There are many devices (Part) of the computer system. Among these part, there are main & necessary to run the computer.
Central Processing Unit (CPU)
The brain of any computer system is the processor unit or Central Processing Unit. All the cables of computer’s devices are connected with CPU. All the processing arithmetical and logical operations and storage are done in this unit. CPU is made up the main three units they are:
I. ALU (Arithmetic and Logical Unit)
II. CU (Control Unit)
III. MU (Memory Unit)

Monitor: -
Every computer must have a display terminal called Visual Display Terminal (VDT) or Visual Display Unit (VDU). Monitor is an output device of computer system. It is looks like a TV screen. The monitor has usually 24 lines or rows and 80 columns. They are two types:

• Monochrome Monitor
• Color Monitor.

Keyboard
Keyboard is an input device for every computer in micro, mini & mainframe computer, keyboard are the main input device. It is made of rectangle plastic plate with any buttons there are three types of keyboard.
(I) XT keyboard (83 keys)
(II) At keyboard (100 keys)
(III) Enhanced keyboard (100 or more keys)
The keyboard contains the following types of keys
(a) function key
(b) alphabet and number keys
(c) special or main keys
(d) arrow keys
(e) numeric key