In the 1950s, Isaac Asimov wrote several stories featuring MULTIVAC, a huge computer the size of a building, city block, or even entire city, that answers questions and keeps society running in an optimal fashion.
Hi vision of underground facilities filled with endless corridors of vacuum tubes and operators typing incomprehensible commands into terminals began to feel somewhat quaint in the ‘80s and ‘90s, when the microcomputer revolution was in full swing. We had a PC on every desktop! Computing was decentralised, and computers themselves were tiny! Asimov’s inability to predict the semiconductor revolution had rendered his stories anachronistic!
But I guess he had the last laugh: