OCR A Level - SLR 1

Which of these is NOT a component of the CPU?

• control unit

• buses

• arithmetic logic unit

• dedicated registers

• RAM

Which job belongs to each component?

• buses

• directing the flow of data between CPU and other devices

• control unit

• coordinates activities of the CPU

• ALU

• parallel wires connecting two or more components

• control unit

• arithmetic and logical operations

• buses

• address, data and control _____

When the CPU wishes to access a particular main memory location, it sends the location to memory via which bus?

• address

• data

• control

• No. 32b

When information retrieved from the main memory is sent to the CPU, it travels down which bus?

The instructions telling each component what to do and when to do it are sent via which bus?

• address

• data

• control

• system

Which bus is NOT bi-directional and does NOT allow information to be sent in both directions?

• address

• data

• control

• system

Which of these tasks is performed by the ALU?

Select all that are correct.

• Addition & subtraction

• Multiplication & division

• Shift operations

• AND, OR, NOT, XOR comparisons