Representing data

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  • Created by: becky.65
  • Created on: 31-05-16 12:35
Define bit
Each digit of a binary number
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Define nibble
Half a byte or 4 bits
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Define byte
A group of 8 binary digits
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Define kilobyte
1024 bytes
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Define megabyte
1024 kilobytes
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Define gigabyte
1024 megabytes
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Define terabyte
1024 gigabytes
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Why do programmers use hexadecimal?
Because large binary numbers are difficult to remember and hexadecimal numbers are easy to recognise and remember
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What is the character set for the computer?
The list of codes and matching characters for the computer
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What is ASCII code?
It uses 7 bits so can provide 127 characters plus the null character
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What is extended ASCII?
It uses 8 bits, making it possible to use 256 characters in total
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What is Unicode?
It uses 16 bits, providing over 65000 possibilities or 32 bits providing over 4 billion possibilities
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Why might unicode be used?
It can provide a character set for a computer that includes a wide range of specialist symbols
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Why does a computer need metadata for an image?
Because the computer is able to work out how to turn the binary values that the image is stored as into the image
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What is a pixel?
One 'dot' of the image
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What happens are the colour depth increases?
More bits per pixel are needed and more bits are needed to store the data
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What is the resolution?
The number of pixels per unit
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How are instructions coded as bit patterns?
The instruction is in two parts; the operator is the instruction part and the operand is the data part
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What does the operator binary code represent?
An operation, e.g. ADD
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How can the CPU tell the difference between data and instructions?
It cannot tell the difference and it simply deals with what it finds according to what it expects to find
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Other cards in this set

Card 2

Front

Define nibble

Back

Half a byte or 4 bits

Card 3

Front

Define byte

Back

Preview of the front of card 3

Card 4

Front

Define kilobyte

Back

Preview of the front of card 4

Card 5

Front

Define megabyte

Back

Preview of the front of card 5
View more cards

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