Quelpr
4 marksComputer Architecture

CAPE Computer Science Unit 1 · 2011 · Paper 2 · Question 1(b)

Write down the truth table (listing all input bit patterns and corresponding outputs) for the logic circuit shown in Figure 1.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)Using only primary logic gates, design and draw the circuit for the given truth table.[6 marks]
  2. 1(c)(i)Explain what is meant by the term 'Flip-flop'.[2 marks]
  3. 1(c)(ii)Explain what is meant by the term 'Multiplexor'.[2 marks]
  4. 1(d)(i)Draw a clearly labelled block diagram of a 2-to-4 line decoder.[3 marks]
  5. 1(d)(ii)A circuit controls four light bulbs B1, B2, B3, and B4 such that only one is on at any time. State how a 2-to-4 line decoder can be used in this circuit and…[3 marks]
  6. 1(e)Find the 4-bit two's complement of -6.[2 marks]
  7. 1(f)Given a floating point representation of 1-bit sign, 3-bit exponent, and 5-bit mantissa, calculate the decimal representation of 001000101, showing all working.[3 marks]

More practice: the rest of this paper · more Computer Architecture questions · all CAPE Computer Science Unit 1 past papers