operating systems basics

Computer Operating Systems

180 Daraga ….. New Stage 6

Lecturer: Sherif Mousa

Email: eng.sherif.mosa@gmail.com

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Feel Free To Ask @ Anytime

Computer Operating Systems

Agenda

• Definition

• Why?

• Components

• History

• Evolution

• Types

• Then What ?

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Definition

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Computer Operating Systems

Definition

• Operating System (OS)

– A collection of software that manages computer hardware resources and provides common services for computer programs.

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• Operating System (OS)

– A collection of software that manages computerhardware resources and provides common services for computer programs.

Why?

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Computer Operating Systems

Why?

• With NO OS

– Every program needs the full hardware specification and drivers to run correctly.

• OS main responsibilities

– Manages computer resources.

– Intermediate between user applications and hardware.

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Computer Operating Systems

OS Responsibilities

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User

Applications

Hardware

CPU

RAM

Display

Keyboard

Operating System

Components

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Computer Operating Systems

Components

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User

Applications

Hardware

CPU

RAM

Display

Keyboard

Operating System

Operating System

Boot Loader

Kernel

Device Drivers

Networking

Security

User Interface

User Applications

History

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Computer Operating Systems

History

• 1950s & 1960s

– LEO, IBM, MIT, Bell Labs

• 1969

– UNIX (AT & T)– Ken Thompson, Dennis Ritchie

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Computer Operating Systems

History (cont’d)

• 1980s– Mac OS 1984 (Apple)

– Windows 1985 (Microsoft)

• 1991 (Multi-Threaded)– GNU/Linux (FSF)

• 2007– Android (Google)

• 2007– iOS (Apple)

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Evolution

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Computer Operating Systems

Evolution

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Unix Terminal

DOS Command LineFirst Mouse Design 1960s

1973 Xerox Alto PC

MAC OS 1 , 1984Windows 1 , 1985

Computer Operating Systems

Evolution (Today)

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Computer Operating Systems

Evolution (Android)

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OS Types

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Computer Operating Systems

OS Types

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Computer Operating Systems

OS Types (PCs & Servers)

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Then What ?

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