MAR MDR CIR

Question 1

Memory Address Register (MAR)

Answer 1

Holds the ​address​ of a location that ​is to be
read from or written to​.

Question 2

Memory Data Register (MDR)

Answer 2

Temporarily stores data​ that has been ​read or data that needs to be ​written​.

Question 3

Current Instruction Register (CIR)

Answer 3

Holds the ​current instruction​ being executed, divided up into ​operand and opcode​.