O-LevelComputer ScienceData Representation2210/11 · May/June 2017 · Q16 Marks
The memory of a computer contains data and instructions in binary. The following instruction is stored in a location of the memory. 0 0 1 0 1 0 0 1 1 1 1 1 1 1 0 0
- (a)Convert the instruction into hexadecimal.[2]
- (b)Explain why a programmer might prefer to read the instruction in hexadecimal rather than in binary.[2]
- (c)Give two other uses of hexadecimal. Use 1 Use 2[2]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [2] 1 mark for any two correct values, 2 marks for all 4 correct values. 29FC
- [2] Two from: ∞ Easier/quicker to understand/read ∞ Easier to debug/identify errors ∞ Fewer digits are used / shorter // takes up less space on screen // more can be shown on screen / page
- [2] Two from: ∞ Notations for colour in HTML // HTML colour (codes) ∞ Error messages ∞ MAC address // IP address ∞ Locations in memory ∞ Memory dump
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