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What does the Control Bus primarily carry?

  1. Data to be processed by the CPU

  2. Power supply signals

  3. Memory addresses

  4. Command and control signals

The correct answer is: Command and control signals

The Control Bus primarily carries command and control signals, which play a crucial role in coordinating and managing the operations of the computer system. This bus communicates instructions from the CPU to various components, ensuring that the operations are synchronized. For instance, the Control Bus sends out signals to tell the memory or input/output devices when to read or write data, thereby directing the flow of information and operations throughout the system. By facilitating communication between the CPU and other components, the Control Bus helps manage tasks like interrupt requests, status signals, and other control functions essential for the smooth functioning of a computer. This is distinct from other buses that handle different types of information, such as data or addresses, which have specific roles in the system architecture.