Introduction to Operating System

1. Basic of Operating System
Imtiaz Ahmed
S10326
Mr. Muhammad Mohsin Hakro
Basics of Operating System
ISLAMABAD APPLIQUE
Learning Center of Arts & Technology
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2. What is Operating System?
The definition of an 'operating system' is bound to evolve with customer
demands and technological possibilities. Virginia Postrel
 An operating system (OS) is system software that manages computer
hardware and software resources and provides common services for
computer programs. The operating system is an essential component of the
system software in a computer system.
 Software that controls the allocation and usage of hardware resource such
as memory, CPU time, disk space and input output devices.
 The foundation software of a machine; that which schedules tasks,
allocates storage, and presents a default interface to the user between
application.

3. Operating System Objectives
 Convenience
 Makes the computer more convenient to use
 Efficiency
 Allows computer system resources to be used in an
efficient manner
 Ability to evolve
 Permit effective development, testing, and
introduction of new system functions without
interfering with service

4. Services Provided by the OS
 Program development (Editors and debuggers)
 Program execution
 Access to I/O devices
 Controlled access to files
 System access
 Error detection and response
 Accounting

5. Components of OS
The User Interface
The Kernel
Program Execution
Protect Mode, Supervisor
Mode and Virtual Modes
Memory Management
Virtual Memory
Multitasking
Disk Access & File Systems
Device Drivers
Networking
Security

6. Types of Operating Systems

7. Enhancing an Operating System
 Utilities
 Provide services not included with OS
 Backup software
 Archives files onto removable media & ensures data integrity
 Anti-virus software
 Crucial utility and Finds, blocks and removes viruses
 Firewall
 Crucial utility, protects your computer from intruders
 Intrusion detection
 Part of firewall package and announces attempts to breach security
 Screen savers
 Crucial utility for command line , prevents burn in, fun & decoration

8. Thank you – Questions ?
Reference Book/Web: Introduction to Computers , Peter Norton - McGraw-Hill.
www.mhhe.com/peternorton
 Background & Images
Simple white back-color made due to clear reading and easy
comprehension of terms and used images for proper visualization
 Fonts
Simple Calibri font style have been used for smooth reading
visualization of writing
 Reference
Reference has been quoted for further self learning of students
This planet came with a set of instructions, but we seem to have misplaced
them. Civilization needs a new operating system. Paul Hawken