COMPUTER ORGANISATION

What is the primary function of the Control Unit (CU) in a CPU?

• • Perform arithmetic operations

• • Direct the flow of operations within the processor

• • Store instructions for execution

• Connect the CPU to external devices
  
  

Which of the following does the CU communicate with directly?

• ALU

• • Cache Memory

• External peripherals
  
  

• • All other processor components

Which of these is NOT a function of the ALU?

• • Addition of integers

• Storing data

• • Logical comparisons

• Subtraction

Registers are:

• • Permanent storage in the CPU

• A type of secondary storage

• Memory external to the processor
  
  

• • Small, fast memory circuits inside the CPU

 What does the Memory Address Register (MAR) hold?

• • Data retrieved from memory

• • The current instruction

• • The address of data in memory

• Results of an ALU operation

The Accumulator:

• • Holds the results of operations in the ALU

• • Stores machine instructions

• • Manages addresses in memory

• Directs input-output operations
  
  

The Control Bus connects the RAM to the CPU via:

• MAR

• MDR

• ALU

• • CU

What does the Address Bus carry?

• Memory addresses

• • Data addresses

• • Control signals

• Instructions for execution
  
  

What is the first step in the Machine Instruction Cycle?

• • Decode

• Execute

• Fetch

• Store

During the execution stage of the instruction cycle:

• • Instructions are fetched from memory

• The operation is carried out

• • Results are stored

• The CPU checks the cache