a-level computer science

First Step of the FETCH

• The CPU reads the contents of the Program Counter to find the address of the next instruction to be fetched

• The address in the MAR is then located in RAM

• The contents of the RAM address are moved to the MDR

• The instruction in the MDR is copied to the CIR

What happens in FETCH immediately after the CPU reads the contents of the Program Counter to find the address of the next instruction to be fetched

• The Program Counter is copied to the CIR

• The Program Counter is incremented

• The contents of the data bus is read

• The contents of the MDR is read

CIR Stands for

• Current Instruction RAM

• Current Instruction Register

• CPU Information Register

• Combined Information Register

• Combined Instruction Register

In the EXECUTE stage the result of a calculation is stored in the ..

• ALU

• MDR

• Control Bus

• Accumulator

• Operand

The PC contains

• Operand

• Address

• Operator

• Data

Which of these are a type of bus that connects internal components?

• Data bus

• Address bus

• Control bus

• Venga bus

Which bus is labelled with (a)?

• Address Bus

• Data Bus

• Control Bus

Which bus is labelled with (b)?

• Address Bus

• Data Bus

• Control Bus

Which computer system architecture uses separate memory and buses for data and for instructions?

• Harvard

• Von Neumann

• Stanford

• Cambridge

Type of memory that is read only and non-volatile

• ROM

• RAM

• Virtual

• Cache