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An abacus was beads on rods and it was used to calculate things.

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Based on Napier's rules for logarithms

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First Stored Program -- Metal Cards

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Stored work on metal punch cards, accurate to 6 decimal places, powered by steam

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First generation computers used vacuum tubes with no air inside to protect their circuitry

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Programmed the first UNIVAC

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First full electronically digital computer built in the US. weighed 30 tons, had 18000 vacuum tubes, and cost $487.00

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had transistors instead of vacuum tubes

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3rd generation computers used integrated circuits that were made of transistors, resisters, and capacitators integrated into one chip

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4th generation computers had microchips

Intel 4004 Microchip had 2250 transistors

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256 bytes of memory
2 MHz Intel 8080 chip
Cost $395---$495

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First computer with GUI and a mouse to work with

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first wide selling personal computer

8088 microchips -- 29000 transistors

256 K RAM

1 or 2 floppy disk drives

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great increase in speed, storage, and memory

networking and internet capabilities

CD Drives

Cell Phones & Wireless Technologies