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