A stopwatch uses six digits to display hours, minutes and seconds. The stopwatch is stopped at: 02 : 31 : 58 Hours Minutes Seconds An 8-bit register is used to store each pair of digits.
- (a)Write the 8-bit binary numbers that are currently stored for the Hours, Minutes and Seconds. Hours Minutes Seconds[3]
- (b)The stopwatch is started again and then stopped. When the watch is stopped, the 8-bit binary registers show: Hours 0 0 0 0 0 1 0 1 Minutes 0 0 0 1 1 0 1 0 Seconds 0 0 1 1 0 1 1 1 Write the denary values that will now be shown on the stopwatch. Hours Minutes Seconds[3]
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Mark scheme
Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.
- [1] (a) Hours: 00000010
- [1] (a) Minutes: 00011111
- [1] (a) Seconds: 00111010
- [1] (b) Hours: 05
- [1] (b) Minutes: 26
- [1] (b) Seconds: 55
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