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The abacus was one of the most early forms of counting.

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Based on Napier's rules for logarithm.

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first stored metal programs cards.

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Used Vacuum tubes to allow no air inside for prevent circuitry.

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

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Programmed UNIVAC
Science's first "Man of the year award".

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

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First fully electronic digital computer built in the U.S., created at the University at Pennsylvania.

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Computers vacuum tubes are replaced with transistors.

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Instructions for a computer are loaded each time the computer is turned on.

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Used integrated circuits that were made of transistors, resistors, and capacitors integrated into one chip.

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Had microchips, Intel 4004 Microchip had 2,250 transistors.

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256 bytes of memory
2MHz intel 8080 chip
Cost 395-495 dollars.

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Apple II computers are used in most schools.

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First wide selling personal computer
8088 Microchip, 29000 transistors.
256 K RAM
1 or 2 floppy disk dives.

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There are computers in most homes. They are faster and less expensive. Windows 95 was the fist decent GUI.

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Great Increase in speed, storage, and memory. Networking and Internet capabilities. CD drives are now used. Cell phones and wireless tech are widespread.