Instructions are processed by a central processing unit (CPU) in a computer.

1. (a)Complete the paragraph about fetching an instruction into the CPU to be processed. Use the terms from the list. Some of the terms in the list will not be used. You should only use a term once. address arithmetic logic unit (ALU) binary control unit (CU) current instruction register (CIR) data denary driver fetch interrupt memory address register (MAR) memory data register (MDR) random access memory (RAM) read only memory (ROM) secondary storage signal The program counter contains the __________ of the next instruction to be processed; this is then sent to the __________ using the address bus. The address is then sent to the __________. Once the address is received, the instruction stored at the location is sent to the __________ using the __________ bus. The instruction is then sent to the __________ that is built into the __________.[7]
2. (b)The CPU uses an instruction set to decode the instruction. State what is meant by an instruction set.[1]