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6 marksComputer Architecture

CAPE Computer Science Unit 1 · 2010 · Paper 2 · Question 1(c)(iii)

Draw a clearly labelled circuit of a 2-to-4 line decoder constructed from one or more of the primary logic gates.

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Other parts of this question

  1. 1(a)Give the truth tables of the THREE primary logic gates, appropriately labelled.[3 marks]
  2. 1(b)Explain how a 4-bit binary counter works, specifying the range of values counted.[4 marks]
  3. 1(c)(i)Draw a clearly labelled block diagram of a 2-to-4 line decoder.[3 marks]
  4. 1(c)(ii)Give the truth table of a 2-to-4 line decoder.[2 marks]
  5. 1(d)(i)Calculate the decimal equivalent of 00101001_2.[1 mark]
  6. 1(d)(ii)Determine if the result of 0110 + 0101 can be stored as a 4-bit binary number.[2 marks]
  7. 1(d)(iii)Showing all working, find the largest and smallest integers that can be represented using 6 bits if signed magnitude is used (leftmost bit for sign, other bits…[2 marks]
  8. 1(d)(iv)Find the 4-bit two's complement representation of -4.[2 marks]

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