Computer Sub-Systems (Cambridge (CIE) O Level Computer Science)
Revision Note
Written by: Robert Hampton
Reviewed by: James Woodhouse
Computer Sub-Systems
What is a sub-system?
A sub-system is a smaller part of a computer system that works together with other sub-systems to create fully functional computer system
A car is a great example of using sub-systems
A car will only function if its sub-systems all work together, they are:
Engine
Breaks
Wheels etc.
Sub-systems can be further broken down into even smaller sub-systems such as:
Engine - spark plugs, sensors, pistons
In computers, there are five main sub-systems:
Central Processing Unit (CPU) | Memory | Storage | Input devices | Output devices |
|---|---|---|---|---|
Executes instructions | Stores data & instructions temporarily for the CPU (RAM) | Stores data and software permanently (HDD, SSD) | Allows a user to enter information (keyboard, mouse) | Displays information or creates a physical output (monitor, printer) |
Computer sub-systems can be further broken down into smaller sub-systems such as:
CPU - control unit, registers & arithmetic logic unit (ALU)
Advantages of sub-systems
Can help troubleshoot problems in a computer system
The ability to isolate a sub-system makes it easier to identify and fix issues, as each sub-system can be examined separately
Developing software relies on the use of different sub-systems to ensure they operate efficiently
Gives developers and designers a clear picture of how sub-systems help build complex systems
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