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Introduction To Computers: Hardware and Software

Introduction to computers1 James TamIntroduction To Computers: Hardware and SoftwareIn this section of notes you will learn about the basic parts of a computer and how they TamWhat Is Hardware ? A computer is made up of Hardware . Hardware is the physical componentsof a computer system , a monitor, keyboard, mouse and the computer TamBasic Units Of MeasurementBit Binary digit Smallest unit of measurement Two possible valuesByte 8 bitsWord The number of adjacent bits that can be stored and manipulated as a unit 32, 64 for home computers, 128 for the most powerfulJames TamLarge Units Of measurement (Memory, Storage) Note: powers of two are used because computer memory and storage are based on the basic unit (bit). Kilobyte (kB) a thousand bytes (1,024 = 210) Megabyte (MB) - a million (1,048,576 = 220) Gigabyte (GB) a billion (1,073,741,824 = 230)~ A complete set of encyclopedias requires about 600 MB of storage Terabyte (TB) a trillion (1,099,511,627,776 = 240)~ 20 million four-drawer filing cabinets full of textJames TamSmall Units Of measurement (Speed) Millisecond (ms) a thousandth of a second (1/1,000 = 10-3) Microsecond ( s) - a millionth of a second (1/1,000,000 = 10-6) Nanosecond (ns) a billionth of a second (1/1,000,000,000 = 10-9)James TamHigh Level View Of A ComputerIntroduction to computers2

Basic Units Of Measurement Bit •Binary digit •Smallest unit of measurement •Two possible values Byte •8 bits Word •The number of adjacent bits that can be stored and manipulated as a unit •32, 64 for home computers, 128 for the most powerful James Tam Large Units Of Measurement (Memory, Storage)

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