GCSE Computer Science Paper 1 Revision

What part of the CPU carries out maths and logic calculations?

• Arithmetic Logic Unit (ALU)

• Program Counter (PC)

• Accumulator

What part of the CPU coordinates the FDE cycle? It decodes instructions which have been fetched from memory.

• Control Unit (CU)

• Cache

• Memory Data Register (MDR)

Small, fast memory that holds frequently accessed items. Checked before checking in RAM.

• Virtual memory

• Cache

• Memory Data Register (MDR)

• Accumulator

Which special register in the CPU contains the address of the memory location currently in use? This is the address of WHERE the instruction or data is fetched from or written to.

• Memory Address Register (MAR)

• Program Counter

• Accumulator

• Cache

Which special register holds the data that has just been fetched or that is about to be written to memory?

• Memory Address Register (MAR)

• Memory Data Register (MDR)

• Accumulator

• Program Counter (PC)

Which special register holds the address of the NEXT instruction to be executed? It increments (goes up) by one after each Fetch-Decode-Execute (FDE) cycle.

• Program Counter

• Accumulator

• Memory Address Register

Which special register holds the results of calculations from the ALU?

• Accumulator

• Cache

• Memory Data Register

What is the name of the computer architecture where the CPU stores data and instructions in the same location?

• Von Neumann

• Van Basten

• Van Halen

What takes place during the Fetch stage?

• Instruction is fetched from memory using the address located in the Program Counter. The Program Counter is then incremented.

• The instruction is interpreted / decoded by the Control Unit.

• The instruction is carried out. The instruction is carried out. The required data is fetched. Data is written to memory. 

What takes place during the Decode stage?

• Instruction is fetched from memory using the address located in the Program Counter. The Program Counter is then incremented.

• The instruction is interpreted / decoded by the Control Unit.

• The instruction is carried out. The instruction is carried out. The required data is fetched. Data is written to memory.