Operating system

unit-1




INTRODUCTION TO OPERATIN
SYSTEM (OS)

UNIT-1

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Lecture Contents-
• What is an OS.
• What are its key functions.
• The evaluation of OS.
• What are the popular types of OS.
•

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What is an Operating System?
• Computer System = Hardware + Software
• Software = Application Software + System Software(OS)
• An Operating System is a system Software that ac
intermediary/interface between a user of a computer
computer hardware.
• Operating system goals:
 Execute user programs and make solving user problem
 Make the computer system convenient to use
 Use the computer hardware in an efficient manner

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The Structure of Computer Systems
 Accessing computer resources is divided into layers.
 Each layer is isolated and only interacts directly with the layer below or
above it.
 If we install a new hardware device
 No need to change anything about the user/applications.
 However, you do need to make changes to the operating system.
 You need to install the device drivers that the operating system will use
to control the new device.
 If we install a new software application
 No need to make any changes to your hardware.
 But we need to make sure the application is supported by the operating
system
 user will need to learn how to use the new application.
 If we change the operating system
 Need to make sure that both applications and hardware will compatible
with the new operating system.