Memory Reference Instructions in Bus System
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Questions and Answers

Which microoperation is performed during the AND to AC instruction?

  • DR ← M[AR]
  • AC ←AC Λ DR (correct)
  • DR ← AC
  • AC ← M[DR]

    • What happens to the output carry during the ADD to AC instruction?

  • Transferred to SC register
  • Transferred to E flip-flop (correct)
  • Transferred to M[AR]
  • Transferred to DR register

    • Why can data stored in memory not be processed directly?

  • Due to memory protection mechanisms
  • Due to slow memory retrieval speed
  • Due to needing to be read to a register first (correct)
  • Due to lack of memory space

    • Which operation decoder is used for the AND to AC instruction?

    <p>D0</p> Signup and view all the answers

    What is the purpose of the LDA instruction in the context provided?

    <p>Load data from memory to AC</p> Signup and view all the answers

    During which microoperation is the sum transferred into AC in the ADD to AC instruction?

    <p>AC ←AC + DR</p> Signup and view all the answers

    What is the purpose of the BSA instruction?

    <p>To branch to a portion of the program called a subroutine or procedure.</p> Signup and view all the answers

    Which microoperation is required for the execution of the STA instruction?

    <p>D3T4: M[AR] ← AC</p> Signup and view all the answers

    What is the reason for not connecting the bus to the inputs of AC?

    <p>Due to the delay encountered in the adder and logic circuit.</p> Signup and view all the answers

    In the ISZ instruction, why is it necessary to read the word into DR before incrementing it?

    <p>Because it is not possible to increment a word inside the memory directly.</p> Signup and view all the answers

    What does the BUN instruction allow a programmer to do?

    <p>Branch unconditionally to an instruction out of sequence.</p> Signup and view all the answers

    How many microoperations are involved in executing the BSA instruction?

    <p>Two</p> Signup and view all the answers

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