2.4b: Character Storage

Exam Board:
OCR

Specification:
2020

What is a Character Set?

A character set is a table that matches together a character and a binary value.

 

Character sets are necessary as they allow computers to exchange data.

Two common character sets are ASCII and Unicode.

ASCII

Unicode

(American Standard Code for Information Interchange)

0100 0001

0100 0010

 0100 0011

Uses Binary

128

Tiny Set of Characters

Less Memory Required per Character

U+0042

U+0055

U+004E

Uses Hexadecimal

137,000+ 

Large Set of Characters

More Memory Required per Character

Character sets are logically ordered. For example, the binary code for A is 01000001, B is 01000010 and C is 01000011 as the code increases by 1 with each character.

Questo's Questions

2.4b - Character Storage:

 

1. What is a character set and why are they needed[2]

2. Describe 3 differences between ASCII and Unicode. [6]

3. The binary code for the character P in ASCII is 01010000. State what the binary code for the character S would be. [1]