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Beads on a rod to count an calculate

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Based on Napier's rules for logarithms

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First stored program-metal card

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Different Engine

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1st Generation computers used Vacuum Tubes with no air inside to protect circuity

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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.A, created at the University of Pennsylvania weighed 30 tons, contained 18,000 vacuum tubes, cost 487,000

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

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3rd generation computers used Integrated Circuits that were made of transistor, resistors, resisitors 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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1.256 bytes of memory
2. 2 MHz Intel 8080 chip
3. Cost $395-$495

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1. First wide selling personal computer
2.8088 Microchip 29,000 transistors
3. 256 K RAM
4. 1or 2 floppy disk drives

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Released Apple II computers that was used in most schools. First commercial computer with Graphic User Interface GUI and Mouse.

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1. Computers in most homes
2. Faster and less expensive
3. Windows 95 was 1st decent GUI

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1. Great Increase in speed, storage and memory
2. Networking and Internet Capabilities
3. CD Drives
4. Cell phones & Wireless Technology