Discussion
Which of these is not a part of the CPU?
Answer: C
Correct answer: Hard disk
The hard disk is a separate storage device connected to the motherboard, not a part of the processor. The CPU has three components. The arithmetic logic unit performs arithmetic and logical operations and sets the status flags - zero, carry, sign, overflow - that conditional branches test. The control unit fetches instructions, decodes them and directs the rest of the machine, generating the timing and control signals. The registers hold the operands and results being worked on, and are the fastest storage in the computer. Modern processors also carry cache on the same die, which blurs the boundary a little, and often an integrated graphics unit and memory controller as well. The processor operates in a repeating fetch–decode–execute cycle. The distinction the question tests is between what is inside the processor package and what is attached to it - and storage is always outside.
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