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Learning objective

ASCII and Unicode: Describe ASCII and Unicode coding systems for coding character data and explain why Unicode was introduced.

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Topic

Information coding systems

Subtopic

ASCII and Unicode

Aqa A Level Computer ScienceFundamentals of data representation

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Quick explanation

ASCII and Unicode: Describe ASCII and Unicode coding systems for coding character data and explain why Unicode was introduced

  • This point belongs to Information coding systems, especially ASCII and Unicode.
  • You need to be able to aSCII and Unicode: Describe ASCII and Unicode coding systems for coding character data and explain why Unicode was introduced.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Why it matters

This objective helps connect ASCII and Unicode to exam-style questions, flashcards, and revision notes for Information coding systems.

Quick student answer

How many bits are used by standard ASCII to represent a character?

Direct answer

7 bits

Key terms

  • Character coding system: A system that assigns codes to characters so that computer systems can store and process character data.
  • Unicode: A character coding system introduced to represent a much wider range of characters than ASCII.

Common trap

Confusing ASCII's bit length with Unicode: State that standard ASCII uses 7 bits and has a limited character set. Unicode was introduced to support a much wider range of characters.

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