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Beads on rods to 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 numbers 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 circuitry

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Programmed UNIVAC Recipient of Computer Science's first "Man of the Year Award

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

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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 of Pennsylvania, weighed 30 tons, contained 18,000 vacuum tubes, Cost $487, 000

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2nd Generation computers replaced vacuum tubes with transistors

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Instructions for a computer that are loaded each time the 3rd Generation computers used computer is turned on

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3rd Generation computers used

Integrated Circuits that were

made of transistors, resistors and capacitators integrated into one chip.

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4th Generation computers had microchips. Intel 4004 Microchip had 2,250 transistors.

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

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Released Apple || computer that was used in most schools. First commercial computer with Graphic User Interphase GUI and Mouse.

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• First wide selling personal computer
• 8088 Microchip 29,000 transistors
• 256 K RAM
• 1 or 2 floppy disk drives

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• Computers in most homes Networking and Internet Capability Faster and less expensive ties . CD Drives

• Windows 95 was 1st decent GUI

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• Great Increase in speed, storage, and memory
• Networking and internet capabilities
• CD Drives
• Cell phones and wireless technology