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A 1961 Relay Computer Running in the Browser

etaioinshrdlu

"Before microchips existed, computers were built with mechanical relays." Should probably say something about vacuum tubes as well!

analog31

And discrete transistors. Now that my curiosity is piqued, I found this nice timeline:

https://www.computerhistory.org/timeline/computers/

It looks like transistorized computers were dominant at the point when integrated circuits were introduced.

hbrav

And before that with gears! (With limited success.)