Memory Reference Instructions in Bus System

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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?

D0 Signup and view all the answers

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

Load data from memory to AC Signup and view all the answers

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

AC ←AC + DR Signup and view all the answers

What is the purpose of the BSA instruction?

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

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

D3T4: M[AR] ← AC Signup and view all the answers

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

Due to the delay encountered in the adder and logic circuit. Signup and view all the answers

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

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

What does the BUN instruction allow a programmer to do?

Branch unconditionally to an instruction out of sequence. Signup and view all the answers

How many microoperations are involved in executing the BSA instruction?

Two Signup and view all the answers

Memory Reference Instructions in Bus System

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Questions and Answers

Which microoperation is performed during the AND to AC instruction?

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

Why can data stored in memory not be processed directly?

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

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

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

What is the purpose of the BSA instruction?

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

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

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

What does the BUN instruction allow a programmer to do?

How many microoperations are involved in executing the BSA instruction?

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