Think of it mechanically. Open or closed. On or off. Then you build patterns which represent a sort of math language. With math all things can be defined. The computer does not have input, the controller needs to input via punch card, input device or magnetic media. The original computers were weaving looms and the early weaving guilds were very secretive about their patterns and methods. I believe the first automated looms used punch cards that controlled the patterns and it’s possible this was the inspiration for the first computers.
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