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Computing - created from Mind Map
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Logic gates
The output is always the opposite of the input. The output is only ever 1 when the input is 0.
Both of the inputs have to be 1 for the output to be one.
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.
AND GATE
OR GATE
NOT GATE
Why do computers use binary?
It is the universal computer language
It is a definite yes or no
There can be no maybes
Fetch De-execute cycle
The CPU fetches the data from the RAM
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.
The computer then carries out the process and resets the ALU and CPU for the next cycle
Storage Devices
Flash
Magnetic
Optical
Non-volatile
No moving parts
Solid state
Universal serial bus - USB
Volatile
All data is deleted when the power to the storage device is stopped
Large storage capacity
RAM (Random Access Memory)
Non-volatile
Is read by a laser
DVD
Input and Output devices
Input devices allow information to go into the computer
Output devices allow information to be displayed to humans
EG/ Keyboard
EG/ Monitor
Computing
Information
- Description
- 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 you exams and I hope this helps.
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- Ben Leader
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- Created by Ben Leader · Jan 3, 2014
- Copied to Note by Ben Leader · Jan 3, 2014
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