Computer Architecture and Microprocessor Section 3 Revision 2
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Questions and Answers

What is the first step to perform binary subtraction?

  • Discard the carry if produced
  • Add the two numbers together
  • Compute the 1’s complement of the subtrahend
  • Find the 2’s complement of the subtrahend (correct)

    • How is the 1’s complement of a number computed?

  • By multiplying each bit by -1
  • By inverting every bit of the number and then adding 1 (correct)
  • By subtracting each bit from 1
  • By adding 1 to the number

    • What does a XOR gate with an input tied high do?

  • Performs addition
  • Acts as an inverter (correct)
  • Generates a two's complement
  • Produces a carry

    • In binary subtraction, what happens if there is no carry after adding the two numbers together?

    <p>Take the 2’s complement of the result</p> Signup and view all the answers

    What occurs when M = 1 in a binary adder-subtractor for subtraction?

    <p>B inputs are all complemented and a 1 is added through the input carry</p> Signup and view all the answers

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