Computer Sub-Systems (Cambridge (CIE) O Level Computer Science)

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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)

Can troubleshoot problems and isolate a sub-system that could be causing the problem
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

to absolutely everything:

the (exam) results speak for themselves:

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