Each seat on a flight is uniquely identified on an LCD above the seat. For example, seat 035C is shown as: [Figure: 035C] The first three characters are digits that represent the row. The fourth character is the seat position in that row. This is a single letter, A to F, that is stored as a hexadecimal value. Each of the four display characters can be stored in a 4-bit register. For example, 0 and C would be represented as: 8 4 2 1 0: 0 0 0 0 C: 1 1 0 0
- (a)Show how the 4-bit registers would store the remaining two characters, 3 and 5. 3 5[2]
- (b)Identify which seat is stored in the following 4-bit registers. 0 0 0 1 1 0 0 1 0 1 0 0 1 1 1 0 [2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [1] (a) 3: 0011
- [1] (a) 5: 0101
- [1] (b) 0001 -> 1
- [1] (b) 1001 -> 9
- [1] (b) 0100 -> 4
- [1] (b) 1110 -> E
- [2] (b) Seat is 194E
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