Computing

Question 1

What is the purpose of the CPU?

Answer 1

The purpose of the CPU is to fetch, decode and execute instructions.

Question 2

What is a register?

Answer 2

A register is a small, fast piece of memory that performs a task.

Question 3

List the 4 registers included in the FDE (Fetch, Decode, Execute) cycle.

Answer 3

1) PC (Program Counter)
2) MAR (Memory Address Register)
3) MDR (Memory Data Register)
4) Accumulator

Question 4

Explain the purpose of the PC (program counter).

Answer 4

The PC (Program Counter) holds the address of the next instruction to be processed. It has a count, which increments by 1 each cycle.

Question 5

Explain the purpose of the MAR (Memory Address Register).

Answer 5

The MAR (Memory Address Register) holds the address of the current instruction being processed.

Question 6

What is the purpose of the MDR (Memory Address Register).

Answer 6

The MDR (Memory Address Register) holds the data of the instruction currently beings processed.

Question 7

What is the purpose of the accumulator?

Answer 7

The accumulator holds the sum of the results of the data.