GCSE Computer Science/Fundamentals of computer systems
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Specification link
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What is a computer?
[edit | edit source]You have probably had a lot of experience with computers. They are a type of machine or device which can be programmed. Computers range from the desktop or laptop you are probably reading this on, to a computer in a vending machine or supermarket checkout. Computers are everywhere in out modern life, and are incredibly important to the functioning of the modern world.
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Extension
The first programmable computer was designed in 1837 by Charles Babbage and Ada Lovelace.
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All computer systems work in a similar way. They have inputs, processes and outputs. Take making a phone call on a mobile phone as an example.
| Input | Process | Header text |
|---|---|---|
| User uses touchscreen to enter the number in | Phone makes contact with towers, and is connected to the other phone | Speaker outputs voice of other person |
Reliability of computer systems
[edit | edit source]Considering that computers are currently used for so much in the modern world, keeping them running well and constantly is an important consideration. A Crittical system is one which needs to constantly be running, or else there is a risk of death, serious injury, or financial problems.
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Examples Why does a life support system need to be reliable? [3] In a question like this, you should look at the number of marks, and try to make roughly that number of developed points. A life support system is a particular type of critical system. A critical system is one which would cause death, serious injury or financial loss if switched off. In the case of a life support system, failure can cause death of the patient. If a life support system was not reliable, it could cause death of a patient. For this reason it will need to be reliable. |
Other examples of critical systems include utilities, banking, emergency communications and air traffic control.