Block Diagram of Computer System

Block Diagram of Computer:

The Block Diagram of Computer displays the representation of a Digital computer system. It consists of three parts, these are:
i. Central Processing Unit (CPU)
ii. Input Devices
iii. Output Devices

Central Processing Unit:

Central Processing Unit (CPU) is like the heart or brain of the computer. The user does not get the desired output, without the necessary option taken by the CPU. The CPU is responsible for the processing of all the instructions which are given by the user to the computer system.

Components of CPU and their functions:

The CPU divides into three main components, these are:

1. Arithmetic & Logic Unit (ALU): ALU stands for Arithmetic Logic Unit. It can perform arithmetic operations on integer binary numbers. The arithmetic unit controls some operations such as Addition, Subtraction, Multiplication and Division.

It also can perform logical operations. The logical unit controls some logical operations such as AND, OR, Less than, Greater than, etc. The data is transmitted to the ALU from the storage unit when required. After completing the whole operation, the result returns to the storage unit.

2. Control Unit: The control unit controls all the activities or tasks and operations which performs inside the computer system. It receives the data or instructions directly from the computer’s main memory. It receives the data or instructions directly from the computer’s main memory.

The CU acts as the supervisor which determines the sequence in which instructions and programs execute. It retrieves the instructions from memory and decodes the instructions. Then it interprets the instructions and schedules the sequence of instructions to be performed accordingly. It transmits the instruction to other parts of the CPU to execute them.

3. Memory Unit: All the data that has been processed is stored in the memory unit. The MU acts as a hub of all the data or information. It also works in sync with the CPU, thus it helps in faster accessing and processing of the data.

Input Devices:

Input Devices use to input data or information or instruction into the CPU. It converts the input data or instructions into binary form. Then it transmits the data to the main memory of the computer. It consists of devices such as a mouse, keyboard, scanner, joystick, etc. However, Input Devices are the medium of communication that takes the data from the user to the computer.

Output Devices:

The output device uses to display the result or output in the form of a soft copy or hard copy. At first, the output is stored in the memory and then displayed in the form of a soft copy or hard copy through output devices. It consists of devices such as a monitor, soundbox, printer, plotter, etc. The output device accepts the information or data in binary form from the CPU. Then it converts it into a readable form for the user.