Computer Sub-Systems (Cambridge International IGCSE Computer Science)

Spec point — "2 (a) Understand that every computer system is made up of sub-systems, which are made up of further sub-systems"

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
  • Brakes
  • 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:

• 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