The Inca may have invented the world’s first computer system—600 years ago

Scientists used the quipu’s data to build working spreadsheets, file systems, and encryption tools, rivaling conventional ...
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The computer book : from the abacus to artificial intelligence, 250 milestones in the history of computer science / Simson L. Garfinkel and Rachel H. Grunspan

C. 2500 BCE: Sumerian abacus -- c. 700 BC: Scytale -- c. 150: Antikythera mechanism -- c. 60: Programmable robot -- c. 850: "On Deciphering Cryptographic Messages ...