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O-LevelComputer ScienceData Representation2210/11 · May/June 2016 · Q74 Marks

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

  1. (a)Show how the 4-bit registers would store the remaining two characters, 3 and 5. 3 5[2]
  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]

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Mark scheme

Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.

  1. [1] (a) 3: 0011
  2. [1] (a) 5: 0101
  3. [1] (b) 0001 -> 1
  4. [1] (b) 1001 -> 9
  5. [1] (b) 0100 -> 4
  6. [1] (b) 1110 -> E
  7. [2] (b) Seat is 194E

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About this question

Topic
Data Representation, O-Level Computer Science (syllabus 2210). Structured question, 4 marks.
Source
O-Level Computer Science, May/June 2016 Paper 1 Variant 1, question 7.

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