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GCSE Computer Science Paper 1
Data Representation
Character Sets
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Cards (4)
ASCII
has
128
different characters each with a 7-bit binary
code.
In ASCII, an extra bit (
0
) is added to the
start
of each code, meaning each character fits into one
byte.
Unlike
ASCII
, each
Unicode
character uses
multiple
bytes.
File
size (in
bits
) = number of
bits
per
character
x number of
characters