Quelpr
2 marksData Representation

CAPE Computer Science Unit 1 · 2015 · Paper 2 · Question 1(e)

Find the 8-bit two's complement of -21, showing all working.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)(i)Write down the truth table showing all possible input bit combinations and outputs for the alarm scenario.[8 marks]
  2. 1(a)(ii)Using only primary logic gates, design and draw the circuit for the alarm system.[4 marks]
  3. 1(b)Explain the meaning of the term 'demultiplexer'.[2 marks]
  4. 1(c)Draw a clearly labelled block diagram of a 3-to-8 line decoder.[3 marks]
  5. 1(d)Determine the decimal equivalent of the hexadecimal number 1A53, showing all working.[3 marks]
  6. 1(f)Given a floating-point format of 1-bit sign, 3-bit exponent, and 5-bit mantissa, calculate the decimal representation of 001101011, showing all working.[3 marks]

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