SHOWROV AHMEDD e p a r t m e n t O f S o f t w a r e E n g i n e e r i n g , D a f f o d i l I n t e r n a t i o n a l U n i v e r s i t y

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HOW DO A USER COMMUNICATE WITH HIS/HER COMPUTER?

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FUNCTION OF OPERATING SYSTEM

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Start And Shut down computerProviding a user interfaceManaging ProgramManaging memoryCoordinating Task And Configuring DeviceMonitor PerformanceEstablished a Internet ConnectionProvide File Manager And other ToolsUpdate AutomaticallyControl a network

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MAINFRAME OSSERVER OSMULTIPROCESSOR OSPERSONAL COMPUTER OSHANDHELD COMPUTER OSEMBEDDED OSSENSOR NODE OSREAL TIME OSSMART CARD OS

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SUPPORTS THOUSANDS OF DEVICESTO SIMULTIANEOUSLY SERVE THOUSANDS OF USERS

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SERVER OS

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MULTIPROCESSOR OS

CPU

MULIPLE CPU’S IN A SINGLE SYSTEM, OR MULTIPROCESOR. MANY POPULAR OS, WINDOWS,LINUX RUN ON MULTIPROCESSORS.

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PERSONAL COMPUTER OS

PERSONAL COMPUTER OPERATING SYSTEM-SUPPORT MULTIPROGAMMING,THEIR JOB IS TO PROVIDE GOOD SUPPORT TO A SINGLE USER 14

HANDHELD COMPUTER OS

HANDHELD OS ARE SOPHISTICATED,WITH THE ABILITY TO HANDLE TELECOMPANY,DIGITAL PHOTOGRAPHY ETC ALSO RUNS THIRD PARTY APPS

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EMBEDDED OS

RUNS ON COMPUTERS THAT CONTROL DEVICES THAT ARE NOT GENERALLY THOUGHT OF AS COMPUTERS AND WHICH DO NOT ACCEPT USER-INSTALLED SOFTWARE

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SENSOR NODE OS

PROGRAMS ARE LOADED IN ADVANCE,DESIGN SIMPLER.TINY OS IS A WELL-KNOWN OPERATING SYSTEM OF A SENSOR NODE. 17

REAL TIME OS

A real time operating system is used in real time computers. For this operating system, time is the main parameter. Real time system can be classified to:

a) Hard real time system: In a hard real time system an action has to happen in particular time duration. It is used in industries, avionics, military, etc.

b) Soft real time system: In a soft real time system actions can be delayed without any side effects. It is used in digital telephones and multimedia systems.

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A smart card is a small card with integrated chip. A smart card is used for authenticating a user, for payment processing, to identify a user, etc. For Example of a smart card operating system: MULTOS.

SMART CARD OS

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