AS/A Computer Science: Data Representation Home
This section does not repeat the content from GCSE but you are also required to know the following in this unit: Number bases - binary, decimal and hexadecimal; Bits and bytes; Unsigned binary addition;
Characters and character sets; Representing sound; Representing images; Lossy and lossless encryption; run length encoding
This content can be found in the GCSE course if you need to look at it.