CPU & LMC

What is the main function of the CPU?

• To make sure that the RAM is working properly
• To get the computer started and complete the boot sequence
• To carry out the fetch-decode-execute cycle.
• To make sure that the computer is functioning properly

What are the two main parts of a program instruction?

• RAM and ROM
• ALU and Control Unit
• Cache and Registers
• Opcode and Operand

What happens during the fetch stage?

• The CPU fetches data and instructions from main memory and stores them in its own registers.
• The CPU fetches instructions from the hard drive.
• The CPU fetches instructions from the ROM
• The CPU fetches data and instructions from the registers

What is the purpose of the CPU's registers?

• These are used to permanently store data and instructions
• These are used to temporarily store data and instructions.
• They are used to keep track of the CPU speed.
• They are used to check the CPU's processing power

What is the purpose of the Program Counter (PC) register?

• This is used to hold the instruction that needs to be carried out.
• This is used to save information.
• This is used to hold the location of the data.
• This is used to store the memory address of the next instruction.

What is the purpose of the Memory Address Register (MAR)?

• This holds the instruction to be carried out by the CPU.
• This hold the location of where the data is.
• This is used to carry out calculation.
• This is used to keep track of which instruction is next.

What is the purpose of Memory Data Register (MDR)?

• This holds all the data that needs to be processed.
• This carries out the calculations.
• This holds the location of where the data will be loaded from or stored.
• This register saves information to the hard drive.

What does the accumulator register do?

• This stores data that is being used by the CPU (for example in calculations)
• This holds personal details
• This is used to keep track of all the instructions.
• This is where the instructions are stored

Which factors could affect the performance of the CPU?

• The physical size of the CPU.
• The clock speed, number of cores and cache size
• How heavy the CPU is.
• How many fans the CPU has

What does the following numeric code represent in LMC: 901

• Output
• Store
• Load
• Input