CPU registers

Question 1

PC

Answer 1

(program counter) Holds the address of the next instruction to be executed

Question 2

MAR

Answer 2

(memory address register) Holds the address of the memory location to be read from/written to

Question 3

MDR

Answer 3

(memory data register) holds the data that has been fetched from memory or about to be written to memory

Question 4

CIR

Answer 4

(current instruction register) Holds the current instruction that is being executed

Question 5

ACC

Answer 5

(accumulator) Holds the result of the calculation from the ALU