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You should be able to…

  • Explain the use of binary codes to represent characters
  • Explain the term character set
  • Describe with examples (for example ASCII and Unicode) the relationship between the number of bits per character in a character set and the number of characters which can be represented



This is a 7/8 bit character set that can represent a maximum of 256 characters….


Revision Notes


You need to put together a set of notes on this topic. Use the questions below and the Topic Overview video to help you structure these.

What is a Character set?

What is ASCII?

What is the difference between 7 bit ASCII and extended ASCII?

What are the limitations of ASCII and extended ASCII?

What is Unicode?

What is the advantage of Unicode over ASCII and Extended ASCII?