1. Data Representation
ASCII

2. What is ASCII A – American S – Standard C – Code for I – Information
I – Interchange

3. Character Set
A character set is all the letters, numbers and symbols on a keyboard.
ASCII is a character set. The character set will vary between countries e.g. if any of you study French you will know that some their characters are different, so they have a different character set.
It is possible to change the character set used on a desk top computer.

4. How is ASCII Stored
ASCII is stored in bits and only 7 bits are required to store the code, but because we usually deal with groups of 8 (a byte) so an additional zero is added to the start of the code.

5. ASCII codes ASCII assigns every character in your character set
Decimal A 65 B 66 Z 90 a 97 2 50
Beep 7
& 38
ASCII assigns
every character in
your character set
with a unique code.

6. Control Character
Most ACSII characters are either displayed on screen or can be printed on a printer. E.g. A, 2
Control characters include keys such as RETURN, TAB and DELETE. These are action buttons, that don’t show on screen.

7. Using 7 bits it is possible to store
27 = 2x2x2x2x2x2x2 = 128
Different characters in ASCII, However the English language requires fewer than 128 characters.

8. Written Task
Exercise 2 (all)