What is a System and Computer Hardware? Is computer a system? Explain.

Organization of a Digital Computer
Organization of a Digital Computer

Computer Hardware

Computer Hardware: Computer hardware is some physical components or rigid objects of a computer system.

Example: Keyboard, Mouse, Monitor, Hard Disk etc.

A Computer system is divided into three main categories of hardware units. Those are below:

  • Input-Output units: Input devices (keyboard, mouse etc.) and output devices such

as a monitor, printer etc.

  • Memory units: Primary memory such as RAM, ROM and secondary memory such

as HDD, CD, DVD etc.

  • Processing unit: Central Processing Unit (CPU) or microprocessor.

Computer System

Question: What is a System? Is the computer a system? Explain.

AnswerA system is an orderly group of interrelated and interdependent components or units work together to perform some predefined tasks.

Example: Solar system, Digestive system , Computer system etc.

Computer System
Computer System

 

Organization of a Digital Computer

 

Organization of a Digital Computer
Organization of a Digital Computer

Figure.  Block diagram of the organization of a digital computer.

 

How a Program is Executed by a Digital Computer

 

How a Program is Executed by a Digital Computer
How a Program is Executed by a Digital Computer

Figure.  How a program is executed by a digital computer.

 

What are Functions of CPU and Functions of ALU?

Discussion:

To execute a program, the program along with its data must be loaded into primary memory RAM either directly from an input unit or from a secondary memory. CPU then takes one instruction and its corresponding data from RAM. Using that instruction the data is processed and the information is generated. The generated information is then stored back to RAM. Finally, the information is sent to the output unit and/or saved in secondary memory for future use.

 

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✓What is Computer Hardware,
✓What is a System?, Is computer a system?, Explain,
✓Block diagram of a computer system,
✓How a Program is Executed by a Digital Computer,
✓system, computer system, block diagram, computer hardware,

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