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I think it was the ENIAC

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The first "electronic computer" was the Atanasoff-Berry Computer, or ABC. This machine wasn't programmable--if you wanted to change the function of the ABC you would have had to go in and rewire it. It also output through a Hollerith Card punch, and the one Atanasoff had was unreliable.

The first programmable computer was the ENIAC. This machine also used a card punch for output.

So...what is a card punch and how would you use one for output? In the days before computers, any sort of automated data processing had to be done by punching holes, in a specific format with a huge machine called a keypunch, into paper cards. They had machines that punched the cards, read the cards, sorted them in all sorts of useful ways, and printed the information on them. (A bank would punch a card every time a customer made a payment on his loan. The data center officers would then sort the cards and print reports that showed who hadn't paid yet. This was slow and cumbersome but easier than doing it completely by hand...and as you guessed, it employed a LOT of keypunch operators.) By creating a card punch that connected to the first computers, they could add a computer to their operation and still be able to use the punched card technology they were comfortable with.

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