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 (C)</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 (A)</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 (D)</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. (A)</p> Signup and view all the answers

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

<p>D3T4: M[AR] ← AC (C)</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. (C)</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. (D)</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. (D)</p> Signup and view all the answers

How many microoperations are involved in executing the BSA instruction?

<p>Two (B)</p> Signup and view all the answers

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