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Ch.3 Notes - Chapter 3 Click to edit Master subtitle style...

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Click to edit Master subtitle style Computer Hardware Chapter 3
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Objectives l history and evolution l microcomputer, midrange, and mainframe l input, output, and storage l system components and functions l computer systems selection To understand how computer hardware, software, data, and communication networks interact with the business process.
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Pre-Computer Calculations l Counting on fingers and toes l Stone or bead abacus l 1642: first mechanical adding machine
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Early Computing l 19th Century Analytical Engine l Charles Never built due to of lack of electronics l 1880s Hollerith’s punched cards used to record census data using On/Off patterns l Later became IBM
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ENIAC – 1946 First Electronic Digital Computer
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Waves of Computing l Late 1950s - Second Generation Transistors replaced vacuum tubes 200,000 to 250,000 calculations per second l 1979 Apple computer l 1982 IBM introduced the PC l Fastest selling PC (after 1982). l Donated computers to elementary schools to get more people to use them in the business world. (apple computers)
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Categories of Computer Systems
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Computer Processing Speeds l Early computers Milliseconds (thousandths of a second) Microseconds (millionths of a second) l Current computers Nanoseconds (billionth of a second) Picoseconds (trillionth of a second) l Program instruction processing speeds Megahertz (millions of cycles per second) Gigahertz (billions of cycles per second) l Commonly called “clock speed” l Expressed in gigahertz (pg.90)
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Microcomputer Uses
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