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Beads on rods to count and calculate

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Based on Napier's rules for logarithms

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First stored program - Metal Cards

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-- Difference Engine
-- Analytical Engine - Stored number on metal punch cards, accurate to 6 decimal places, powered by steam

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1st generation computers used Vacuum Tubes with no air inside to protect cir

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Moth stuck in relay switch. Grace Hopper called it debugging a computer.

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Used silicon, won Nobel Peace Prize, on-off switch

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First fully electronic digital computer built in the US. It was created at the University of Pennsylvania, weighed 30 tons, contained 18,000 vacuum tubes, and cost $487,000 to build.

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2nd generation computers replaced vacuum tubes with transistors

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3rd Generation computers used intergrated chips

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4th Generation computers used microchips