Registers

Question 1

What does MAR do?

Answer 1

Holds address of current instruction being executed

Keeps track of where data is located

Question 2

What does MDR do?

Answer 2

Holds data copied from RAM ready for CPU to process

Question 3

What does the PC do?

Answer 3

Points to next instruction that needs to be executed

Question 4

What does the ACC do?

Answer 4

Holds data being processed and results of processing

Speeds up storage and retrieval of calculations

Question 5

What does the ALU do?

Answer 5

Performs arithmetic equations

Question 6

What does the CU do?

Answer 6

Controls and coordinates functions of registers

Controls input/output and flow of data in CPU

Controls monitors & hardware attached to system

Question 7

What does the CIR do?

Answer 7

Holds the instruction currently being decoded and executed

Question 8

Where are registers located?

Answer 8

CPU

Question 9

List all registers

Answer 9

MAR, MDR, CIR, CU, PC, ACC, ALU

Question 10

What is a register?

Answer 10

Small high speed storage contained within the CPU