A computer is based on two states solely so it can only read 1s and 0s.
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Logic Diagrams -
The "And" gate means both have to be on. The "or" gate means that either can be on or both. The Not gate means it has to be off to send power
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Truth tables
A table consisting of the possible outcomes of a selected gate.
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Boolean operators
Using the operator "and" would only bring you results with both. with or it will bring you results with either and not it will bring you result without the specified item.
Data needs to be converted into binary format to be processed by a computer.
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Number - Denary to Binary
128, 64, 32 , 16, 8, 4, 2, 1
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Number - 8 bit binary integers
8 bit overflow occurs in the sum 11111111 + 1
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Number - Binary shifts
Shift to the left once means times it by 2. A right shift once means divide by 2
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Number - Binary and hexadecimal
Split the 8 digits in half. 2. Each half is 1 digit. 3. If either digit’s value is greater than 9, assign it the appropriate letter.
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Number - check digits
Last number on the bar code on the right First odd then even, x by 3
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Character - Binary codes and character on a keyborard
The system uses codes to represent each character, number and symbol in the chosen language. The most commonly used system is called the 7 bit standard ASCII code.
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Character - character set
Set of characters (Letters, numbers and symbols on a keyboard.
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Sound - Samples
Sound is captured via a microphone and then is passed through a sound card converting it into binary format.
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Sound - Sampling intervals
Better quality sound takes up more storage on the computer.
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Images - Image as pixels
2 colours can be more represent a picture using 1s and 0s (lesson with smile face colour in).
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Images - Metadata
Info used by the computer. Info used by the user (Also smiley face lesson)
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Images - Colour Depth and resolution effect
Better resolution and image depth means more storage is taken up. The worse the quality the less storage taken.
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Other cards in this set
Card 2
Front
The "And" gate means both have to be on. The "or" gate means that either can be on or both. The Not gate means it has to be off to send power
Back
Logic Diagrams -
Card 3
Front
A table consisting of the possible outcomes of a selected gate.
Back
Card 4
Front
Using the operator "and" would only bring you results with both. with or it will bring you results with either and not it will bring you result without the specified item.
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