essential concepts lesson 1 An Overview of the Computer System This lesson includes the following sections: The Computer System Defined Hardware: The Nuts and Bolts of the Machine Software: Bringing the Machine to Life The Shapes of Computers Today The Computer System Defined
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A computer is an electronic device used to process data, converting data into information that is useful to people.
A complete computer system includes four distinct parts:
Hardware: The Nuts and Bolts of the Machine
How Memory is Measured
Unit Approx. Value Actual Value
Kilobyte (KB) 1,000 1,024
Megabyte (MB) 1,000,000 1,048,576
Gigabyte (GB) 1,000,000,000 1,073,741,824
Terabyte (TB) 1,000,000,000,000 1,099,511,627,776
Input and Output Devices
What is Software?
Word processing programs Spreadsheet software
Database management Presentation programs
Graphics programs Networking software
Web design tools and browsers Internet applications
Communications programs Utilities
Entertainment and education Multimedia authoring
Microcomputers, or Personal Computers
Philips Velo 500