It was a binary, electrically driven, mechanical calculator, with limited programmability, reading instructions from punched celluloid film. The “Z1” was the first freely programmable computer in the world that used Boolean logic and binary floating-point numbers; however, it was unreliable in operation.

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Konrad Zuse was bored. A civil engineering student in Berlin, he hated his job's tedious calculations. So, as an engineer in 1936, he began assembling metal plates, pins and discarded movie film into what became the Z1—the first of several mechanical computers.

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