Basic Computer 🖥️💻 Organisation
Basic Computer Organization
In this chapter you will learn about:
• Basic operations performed by all types of computer systems
• Basic organization of a computer system
• Input unit and its functions
• Output unit and its functions
• Storage unit and its functions.
• Types of storage used in a computer system
• Arithmetic Logic Unit (ALU)
• Control Unit (CU)
• Central Processing Unit (CPU)
• Computer as a system
The Five Basic Operations of a Computer System
• Inputting. The process of entering data and instructions into the computer system.
• Storing. Saving data and instructions to make them readily available for initial or additional processing whenever required .
• Processing. Performing arithmetic operations (add, subtract, multiply, divide, etc.) or logical operations (comparisons like equal to, less than, greater than, etc.) on data to convert them into useful information.
• Outputting. The process of producing useful information or results for the user such as a printed report or visual display
• Controlling. Directing the manner and sequence in which all of the above operations are performed.
Basic Computer Of a Computer System
Input Unit
An input unit of a computer system performs the following functions:
1. It accepts (or reads) instructions and data from outside world.
2. It converts these instructions and data in computer acceptable form.
3. It supplies the converted instructions and data to the computer system for further processing.
Output Unit
An output unit of a computer system performs the following functions:
1. It accepts the results produced by the computer, which are in coded form and hence, cannot be easily understood by us
2. It converts these coded results to human acceptable (readable) form
3. It supplies the converted results to outside world.
Storage Unit
The storage unit of a computer system holds (or stores) the following:
1. Data and instructions required for processing (received from input devices)
2. Intermediate results of processing.
3. Final results of processing, before they are released to an output device.
Types of Storage
The broad categories of storage are:
1. Primary storage
2. Secondary storage
Primary Storage
• Used to hold running program instructions.
• Used to hold data, intermediate results, and results of ongoing processing of joh(s).
• Fast in operation.
• Small Capacity.
• Expensive .
• Valatie (looses data on power dissipation).
Secondary Storage
• Used to hold stored program instructions
• Used to hold data and information of stored jobs
• Slower than primary storage
• Large Capacity
• Lot cheaper that primary storage
• Retains data even without power
Arithmetic Logic Unit (ALU)
Arithmetic Logic Unit of a computer system is the place where the actual executions of instructions takes place during processing operation
Control Unit (CU)
Control Unit of a computer system manages and coordinates the operations of all other components of the computer system.
Central Processing Unit (CPU)
Arithmetic Control Unit Central
Logic + (CU) = Processing
Unit Unit
(ALU) (CPU)
• It is the brain of a computer system
• It is responsible for controlling the operations of all other units of a computer system
The System Concept
A system has following three characteristics:
1. A system has more than one element. 2. All elements of a system are logically related.
3. All elements of a system are controlled in a manner to achieve the system goal.
A computer is a system as it comprises of integrated components (input unit, output unit, storage unit, and CPU) that work together to perform the steps called for in the executing program.
Key Words/Phrases
• Arithmetic Logic Unit (ALU)
• Auxiliary storage
• Central Processing Unit (CPU)
• Computer system
• Control Unit (CU)
• Controlling
• Input interface
• Input unit
• Inputting Main memory
• Output interface
• Output unit
• Outputting
• Primate storage
• Processing
• Secondary storage
• Storage unit
• Storing
• System
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