A-LevelComputer ScienceData representation9618/12 · May/June 2021 · Q66 Marks
A computer uses the ASCII character set.
- (a)State the number of characters that can be represented by the ASCII character set and the extended ASCII character set. ASCII Extended ASCII[2]
- (b)Explain how a word such as 'HOUSE' is represented by the ASCII character set.[2]
- (c)(i)Write the hexadecimal value for the Unicode character '1'.[1]
- (c)(ii)Write the denary value for the Unicode character '5'.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [1] (a) ASCII = 128 // 2^7
- [1] (a) Extended ASCII = 256 // 2^8
- [1] (b) Each character has its own unique code
- [1] (b) Each character in the word is replaced by its code
- [1] (b) The codes are stored in the order in the word
- [1] (c)(i) 31
- [1] (c)(ii) 53
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