O-LevelComputer ScienceData Representation2210/12 · May/June 2016 · Q37 Marks
Convert the following hexadecimal number into 12-bit binary: 4AF
- (a)Convert the following hexadecimal number into 12-bit binary: 4AF[3]
- (b)(i)The 2016 Olympic Games will be held in Rio de Janeiro. A timer that counts down to the opening of the Games is shown on a microprocessor-controlled display. The number of hours, minutes and seconds until the Games open are held in three 8-bit registers. The present register values are: 0 1 1 0 1 0 0 1 105 hours 0 0 1 0 0 0 0 0 32 minutes 0 0 0 1 0 1 0 0 20 seconds The timer will count down in seconds. Show the values in each 8-bit register 30 seconds after the time shown above: hours minutes seconds[3]
- (b)(ii)Write the hexadecimal value of the minutes register from part (b)(i).[1]
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [3] 3 (a) 1 mark for each nibble 0100 1010 1111
- [3] (b)(i) 01101001 105 hours 1 mark 00011111 31 minutes 1 mark 00110010 50 seconds 1 mark
- [1] (ii) 1F
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