Computing

Ben Leader
Mind Map by , created over 5 years ago

This is for my GCSE exams, it covers why computers use binary, the fetch de-execute cycle, input and output devices, logic gates and storage devices. Hope you enjoy, if you do please leave a positive comment on how I can improve these mindmaps and what you liked about them. Good luck for all of your exams and I hope this helps.

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Ben Leader
Created by Ben Leader over 5 years ago
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Computing
1 Logic gates
1.1 The output is always the opposite of the input. The output is only ever 1 when the input is 0.
1.2 Both of the inputs have to be 1 for the output to be one.
1.3 The output is only 1 when either of the inputs are 1. There is only ever a 0 when both of the inputs are 0.
1.4 AND GATE
1.5 OR GATE
1.6 NOT GATE
2 Why do computers use binary?
2.1 It is the universal computer language
2.2 It is a definite yes or no
2.3 There can be no maybes
2.4 Has a charge or no charge - so logic gates turn them off or on
3 Fetch De-execute cycle
3.1 The CPU fetches the data from the RAM
3.2 Decode the data so that the ALU can understand the binary code, each CPU has a set of instructions which can understand the binary in different ways.
3.3 The computer then carries out the process and resets the ALU and CPU for the next cycle
4 Storage Devices
4.1 Flash
4.1.1 Non-volatile
4.1.2 No moving parts
4.1.3 Solid state
4.1.4 Universal serial bus - USB
4.2 Magnetic
4.2.1 Non-Volatile
4.2.2 All data is deleted when the power to the storage device is stopped
4.2.3 Large storage capacity
4.2.4 RAM (Random Access Memory)
4.3 Optical
4.3.1 Non-volatile
4.3.2 Is read by a laser
4.3.3 DVD
5 Input and Output devices
5.1 Input devices allow information to go into the computer
5.1.1 EG/ Keyboard
5.2 Output devices allow information to be displayed to humans
5.2.1 EG/ Monitor