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How CPUs Work: From Silicon to Instructions
Priya clicked the link and nothing happened. The tab sat there, grey and patient, and she had time to resent it. Then the page arrived all at once, as if the wait had been imaginary. She wanted to know which of those two moments was the lie.
"Neither," said her housemate, Jonah, without looking up from his own screen. "The chip was busy the whole time. It just was not busy in a way you can see."
The chip he meant was the CPU, the central processing unit. Priya had thought of it as a very fast calculator. Jonah shook his head.
"It does calculate. Most of the time it is also deciding where a number lives, what to do next, and what it can safely guess."
He held up a finger, one instruction, the smallest job.