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OPERATING SYSTEMS LECTURE: Chapter 1 INTRODUCTION TO OPERATING SYSTEMS * Elements of a computer system: Hardware, Software, Peopleware, Communication, Data, * Types of Software: System software and application software | Type | Description | Examples | System software | Basic Software | * SW that manages and controls hw and application sw * usually called OS * includes utility programs/ service programs * language processors | OSDevice driversDisc compressionOptimization swScreen saversAnti virus swCompilers/ interpreters | | Middleware | Sw that operates between OS and appcn sw | DbmsCommunication mgmt sysOperations m toolsSw development system | Application software | Common Application Software | Sw that is used for a variety of industries and work | Word processing swSpreadsheet swCad/camStatistical swGraphics swGroupware | | Specific Application Software | Sw that is used for specific industries and work | Payroll calc swFinancial accounting swSales mgmt swProduction mgmt system | | | | |

User | | Software Application software Runs on system software platform | | Systems software Middle ware | | Basic software Acts as interface between the hw and appcn sw, and user | | | | hardware |

PURPOSE OF OPERATING SYSTEM * provide an environment within the hardware so that users can execute their programs * serves as a platform where other programs can run

goal of OS * convenience of the user * efficiency of the system

Acts as: * a receptionist, it handles the user interface. As the computer is booted, the first point of contact will be the operating system. It is considered the welcoming committee which assists the user all throughout his/her contact with the hardware.

* a dispatcher, it provides services for managing the queue of

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