Basic Computer Structure: Executing The Programme

Question 1

What is MAR

Answer 1

Memory Address Register

Question 2

PC?

Answer 2

Programme Counter

Question 3

What is step 1?

Answer 3

Contents of PC are moved to the MAR

Question 4

What is IR?

Answer 4

Instruction Register

Question 5

What is step 2?

Answer 5

Contents of memory location 0000 moved to IR

Question 6

Step 3?

Answer 6

IR contents are decoded

Question 7

Step 4?

Answer 7

Execute instruction CLEAR A (put 0 in the Accumulator)

Question 8

Step 5?

Answer 8

Contents of PC moved to MAR

Question 9

Step 6?

Answer 9

Contents of memory location 00001 moved to IR

Question 10

Step 7?

Answer 10

IR contents are decoded

Question 11

Step 8?

Answer 11

Select Register 1

Question 12

Step 9?

Answer 12

Store Accumulator in Data Buffer

Question 13

Step 10? (Final step)

Answer 13

Copy data from Buffer to Register 1