H446 Section 1: Components of a computer

Which registers hold and transfer data or instructions?

• Accumulator

• MDR

• MAR

• PC

• CIR

Which registers hold and transfer the memory addresses of data or instructions?

• Accumulator

• MDR

• MAR

• PC

• CIR

At which stage in the F-D-E cycle is the ALU needed?

• Fetch

• Decode

• Execute

• Repeat

At which stage in the F-D-E cycle is the accumulator involved?

• Fetch

• Decode

• Execute

• Repeat

In computer architecture, what is meant by the term bus?

• To transport power to the different computing components

• Connect the processor to main memory and pass signals

• To keep track of timing on the system clock

• To access the data stored on the different pages in main memory

Which of the following is NOT one of the control lines on the control bus?

• Memory Write

• Interrupt Request

• Bus Request

• Memory Reset

What is the job of the data bus?

• Transfer data and instructions between the processor and main memory

• Transfer data between the processor and main memory

• Transfer memory addresses between the processor and main memory

• Write data to main memory

Which unit carries out logical instructions?

Sends out signals to co-ordinate how the processor works and instructions are decoded here.

• Control Unit (CU)
• Central Processing Unit (CPU)
• Arithmetic Logic Unit (ALU)
• Current Instruction Register (CIR)

Holds the address of the next instruction to be executed.  It gets incremented with each cycle of the fetch-decode-execute cycle. 

• Memory Address Register (MAR)
• Current Instruction Register (CIR)
• Program Counter (PC)
• Accumulator (ACC)