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.
Question: What is a System? Is the computer a system? Explain.
Answer: A 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.
Organization of a Digital Computer
Figure. Block diagram of the organization of a digital computer.
How a Program is Executed by a Digital Computer
Figure. How a program is executed by a digital computer.
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,
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