Ch1 Introduction to operating system

Desktop Operating System DKC1301

To describe the basic concept of computer systems

To provide major components of operating systems

To give an overview of the many types of computing environments

To explore several open-source operating systems

To perform installation and configuration of operating system


A program that acts as an intermediary between a user of a computer and the computer hardware

Operating system goals: Execute user programs and make solving user problems

easier Make the computer system convenient to use Use the computer hardware in an efficient manner


An operating system (OS) is a software program that enables the BIOS of computer hardware to communicate and operate with the computer Application software

Without a computer operating system, a computer would be useless.




Vacuum tube basedVacuum tube based The use vacuum tubes in place of The use vacuum tubes in place of

relays as a means of storing data in relays as a means of storing data in memory and the use of stored‐memory and the use of stored‐program concept.program concept.

It requires 3.5 KW of electricity per It requires 3.5 KW of electricity per day to keep the vacuum tubes day to keep the vacuum tubes runningrunning


Generation in computer Generation in computer terminology is a change in terminology is a change in technology a computer is/was being technology a computer is/was being used.used.

Initially, the generation term Initially, the generation term was used to distinguish between was used to distinguish between varying hardware technologies. But varying hardware technologies. But nowadays, generation includes both nowadays, generation includes both hardware and software, which hardware and software, which together make up an entire together make up an entire computer system.computer system.


First invented by a British scientist named John A. Fleming in 1919, First invented by a British scientist named John A. Fleming in 1919, although Edison had made some dsicoveries while working on the although Edison had made some dsicoveries while working on the lightbulb. The vacuum tube was improved by Lee DeForest.lightbulb. The vacuum tube was improved by Lee DeForest.



Vacuum tube technologyVacuum tube technology UnreliableUnreliable Supported Machine language onlySupported Machine language only Very costlyVery costly Generate lot of heatGenerate lot of heat Slow Input/Output deviceSlow Input/Output device Huge sizeHuge size Need of A.C.Need of A.C. Non-portableNon-portable Consumed lot of electricityConsumed lot of electricity


ENIACENIAC EDVACEDVAC UNIVACUNIVAC IBM-701IBM-701


This generation using the This generation using the transistor were cheaper, transistor were cheaper, consumed less power, more consumed less power, more compact in size, more reliable compact in size, more reliable and faster than the first and faster than the first generation machines made of generation machines made of vacuum tubes.vacuum tubes.

In this generation, magnetic In this generation, magnetic cores were used as primary cores were used as primary memory and magnetic tape memory and magnetic tape and magnetic disks as and magnetic disks as secondary storage devices.secondary storage devices.


The first transistor was invented at Bell Laboratories on December 16, The first transistor was invented at Bell Laboratories on December 16, 1947 by William Shockley (seated at Brattain's laboratory bench), John 1947 by William Shockley (seated at Brattain's laboratory bench), John Bardeen (left) and Walter Brattain (right).Bardeen (left) and Walter Brattain (right).


Use of transistorsUse of transistors Reliable as compared to First generation Reliable as compared to First generation

computerscomputers Smaller size as compared to First Smaller size as compared to First

generation computersgeneration computers Generate less heat as compared to First Generate less heat as compared to First

generation computersgeneration computers Consumed less electricity as compared to Consumed less electricity as compared to

First generation computersFirst generation computers Faster than first generation computersFaster than first generation computers Still very costlyStill very costly A.C. neededA.C. needed Support machine and assembly languagesSupport machine and assembly languages


IBM 1620IBM 1620 IBM 7094IBM 7094 CDC 1604CDC 1604 CDC 3600CDC 3600 UNIVAC 1108UNIVAC 1108


Integrated Circuits (IC's) in place of Integrated Circuits (IC's) in place of transistorstransistors

A single IC has many transistors, A single IC has many transistors, resistors and capacitors along with resistors and capacitors along with the associated circuitry. the associated circuitry.

Integrated solid‐state circuitry, Integrated solid‐state circuitry, improved secondary storage improved secondary storage devices and new input/output devices and new input/output devices were the most important devices were the most important advances in this generation.advances in this generation.


IC usedIC used More reliableMore reliable Smaller sizeSmaller size Generate less heatGenerate less heat FasterFaster Lesser maintenanceLesser maintenance Still costlyStill costly A.C. neededA.C. needed Consumed lesser electricityConsumed lesser electricity Support high-level languageSupport high-level language



The idea of integrating electronic circuits into a single device was born, The idea of integrating electronic circuits into a single device was born, when the German physicist and engineer Werner Jacobi (de) developed and when the German physicist and engineer Werner Jacobi (de) developed and patented the first known integrated transistor amplifier in 1949 and the patented the first known integrated transistor amplifier in 1949 and the British radio engineer Geoffrey Dummer proposed to integrate a variety of British radio engineer Geoffrey Dummer proposed to integrate a variety of standard electronic components in a monolithic semiconductor crystal in standard electronic components in a monolithic semiconductor crystal in 1952. A year later, Harwick Johnson filed a patent for a 1952. A year later, Harwick Johnson filed a patent for a prototype integrated circuit (IC).prototype integrated circuit (IC).


IBM-360 seriesIBM-360 series Honeywell-6000 seriesHoneywell-6000 series PDP (Personal Data PDP (Personal Data

Processor)Processor) IBM-370/168IBM-370/168 TDC-316TDC-316


Very-large-scale integration (VLSI)Very-large-scale integration (VLSI) VLSI circuits having about 5000 VLSI circuits having about 5000 transistors and other circuit transistors and other circuit elements and their associated elements and their associated circuits on a single chip made it circuits on a single chip made it possible to have microcomputers of possible to have microcomputers of fourth generation.fourth generation.


Fourth Generation computers became Fourth Generation computers became more powerful, compact, reliable, and more powerful, compact, reliable, and affordable. As a result, it gave rise to affordable. As a result, it gave rise to personal computer (PC) revolution.personal computer (PC) revolution.

In this generation, Remote processing, In this generation, Remote processing, Time-sharing, Real-time, Multi-Time-sharing, Real-time, Multi-programming Operating System were programming Operating System were used.used.

All the higher level languages like C All the higher level languages like C and C++, DBASE, etc., were used in and C++, DBASE, etc., were used in this generation.this generation.


VLSI technology usedVLSI technology used Very cheapVery cheap Portable and reliablePortable and reliable Use of PC'sUse of PC's Very small sizeVery small size Pipeline processingPipeline processing No A.C. neededNo A.C. needed Concept of internet was introducedConcept of internet was introduced Great developments in the fields of networksGreat developments in the fields of networks Computers became easily availableComputers became easily available


DEC 10DEC 10 STAR 1000STAR 1000 PDP 11PDP 11 CRAY-1 (Super Computer)CRAY-1 (Super Computer) CRAY-X-MP (Super Computer)CRAY-X-MP (Super Computer)


Artificial Intelligence is the Artificial Intelligence is the branch of computer science branch of computer science concerned with making concerned with making computers behave like humans. computers behave like humans. The term was coined in 1956 by The term was coined in 1956 by John McCarthy at the John McCarthy at the Massachusetts Institute of Massachusetts Institute of Technology.Technology.


Games PlayingGames Playing programming computers to play games such as chess and programming computers to play games such as chess and

checkers.checkers.


The first microcomputers did not have the capacity or need for the elaborate operating systems that had been developed for mainframes and minis; minimalistic operating systems were developed, often loaded from ROM and known as Monitors.

The introduction of the Intel 80386 CPU chip with 32-bit architecture and paging capabilities, provided personal computers with the ability to run multitasking operating systems like those of earlier minicomputers and mainframes.


Computer system can be divided into four components: Hardware – provides basic computing resources

CPU, memory, I/O devices Operating system

Controls and coordinates use of hardware among various applications and users

Application programs – define the ways in which the system resources are used to solve the computing problems of the users Word processors, compilers, web browsers, database systems,

video games Users

People, machines, other computers



Depends on the point of view Users want convenience, ease of use and good

performance Don’t care about resource utilization

But shared computer such as mainframe or minicomputer must keep all users happy

Users of dedicate systems such as workstations have dedicated resources but frequently use shared resources from servers

Handheld computers are resource poor, optimized for usability and battery life

Some computers have little or no user interface, such as embedded computers in devices and automobiles


GUI - Short for Graphical User Interface, a GUI Operating System contains graphics and icons and is commonly navigated by using a computer mouse

Example: 1. System 7.x2. Windows 983. Windows CE


Multi-user - A multi-user operating system allows for multiple users to use the same computer at the same time and/or different times.

Example1. Linux2. Unix3. Windows


Multiprocessing - An operating system capable of supporting and utilizing more than one computer processor. Below are some examples of multiprocessing operating systems.

Example:1. Linux2. Unix3. Windows


Multitasking - An operating system that is capable of allowing multiple software processes to run at the same time. Below are some examples of multitasking operating systems.

Example:1. Unix2. Windows


Multithreading - Operating systems that allow different parts of a software program to run concurrently. Operating systems that would fall into this category are:

Example:1. Linux2. Unix3. Windows


bootstrap program is loaded at power-up or reboot Typically stored in ROM or EPROM, generally known as

firmware Initializes all aspects of system

Daemons (system processes) Not part of kernel but remain in memory all the time

Loads operating system kernel and starts execution


Computer-system operation One or more CPUs, device controllers connect through

common bus providing access to shared memory Concurrent execution of CPUs and devices competing for

memory cycles


Stand-alone general purpose machines But blurred as most systems interconnect with

others (i.e., the Internet) Portals provide web access to internal systems Network computers (thin clients) are like

Web terminals Mobile computers interconnect via wireless

networks Networking becoming ubiquitous – even home

systems use firewalls to protect home computers from Internet attacks


Handheld smartphones, tablets, etc What is the functional difference between them

and a “traditional” laptop? Extra feature – more OS features (GPS,

gyroscope) Allows new types of apps like augmented

reality Use IEEE 802.11 wireless, or cellular data

networks for connectivity Leaders are Apple iOS and Google Android


Distributed computiing Collection of separate, possibly heterogeneous, systems

networked together Network is a communications path, TCP/IP most common

Local Area Network (LAN) Wide Area Network (WAN) Metropolitan Area Network (MAN) Personal Area Network (PAN)

Network Operating System provides features between systems across network Communication scheme allows systems to exchange

messages Illusion of a single system


Client-Server Computing Dumb terminals replaced by smart PCs Many systems now servers, responding to requests generated

by clients Compute-server system provides an interface to client to

request services (i.e., database) File-server system provides interface for clients to store

and retrieve files


Another model of distributed system P2P does not distinguish clients and

servers Instead all nodes are considered

peers May each act as client, server or both Node must join P2P network

Registers its service with central lookup service on network, or

Broadcast request for service and respond to requests for service via discovery protocol

Examples include Napster and Gnutella, Voice over IP (VoIP) such as Skype


Allows operating systems to run applications within other OSes Vast and growing industry

Emulation used when source CPU type different from target type (i.e. PowerPC to Intel x86) Generally slowest method When computer language not compiled to native code

– Interpretation Virtualization – OS natively compiled for CPU,

running guest OSes also natively compiled Consider VMware running WinXP guests, each running

applications, all on native WinXP host OS VMM (virtual machine Manager) provides

virtualization services


Use cases involve laptops and desktops running multiple OSes for exploration or compatibility Apple laptop running Mac OS X host, Windows as a

guest Developing apps for multiple OSes without having

multiple systems QA testing applications without having multiple

systems Executing and managing compute environments within

data centers VMM can run natively, in which case they are also

the host There is no general purpose host then (VMware ESX

and Citrix XenServer)



Delivers computing, storage, even apps as a service across a network

Logical extension of virtualization because it uses virtualization as the base for it functionality. Amazon EC2 has thousands of servers, millions of virtual

machines, petabytes of storage available across the Internet, pay based on usage

Many types Public cloud – available via Internet to anyone willing to pay Private cloud – run by a company for the company’s own use Hybrid cloud – includes both public and private cloud

components Software as a Service (SaaS) – one or more applications available

via the Internet (i.e., word processor) Platform as a Service (PaaS) – software stack ready for

application use via the Internet (i.e., a database server) Infrastructure as a Service (IaaS) – servers or storage available

over Internet (i.e., storage available for backup use)


Cloud computing environments composed of traditional OSes, plus VMMs, plus cloud management tools Internet connectivity requires security like firewalls Load balancers spread traffic across multiple applications


Real-time embedded systems most prevalent form of computers Vary considerable, special purpose, limited purpose OS,

real-time OS Use expanding

Many other special computing environments as well Some have OSes, some perform tasks without an OS

Real-time OS has well-defined fixed time constraints Processing must be done within constraint Correct operation only if constraints met


Operating systems made available in source-code format rather than just binary closed-source

Counter to the copy protection and Digital Rights Management (DRM) movement

Started by Free Software Foundation (FSF), which has “copyleft” GNU Public License (GPL)

Examples include GNU/Linux and BSD UNIX (including core of Mac OS X), and many more

Can use VMM like VMware Player (Free on Windows), Virtualbox (open source and free on many platforms - http://www.virtualbox.com) Use to run guest operating systems for exploration

Windows 7 installation


2. Go to Boot menu and choose Boot from CD/DVD.


3. Press F10 to save the configuration and exit BIOS then reset your computer.


4. Insert Windows 7 DVD into your DVD drive then start up your computer, Windows 7 will be loading files.


5. Select your language, time & currency format, keyboard or input method and click Next.


6. Click Install now.


7. Check I accept the license terms and click Next.


8. Click Upgrade if you already have a previous Windows version 117 or Custom (advanced) if you don’t have a previous Windows version or want to install a fresh copy of Windows 7.


9. (Skip this step if you chose Upgrade and have only one partition) Select the drive where you want to install Windows 7 and click Next. If you want tomake any partitions, click Drive options (advanced), make the partitions and then click Next.


10. It will now start installing Windows 7. The first step, (i.e. Copying Windows files) was already done when you booted the Windows 7 DVD so it will complete instantly.


11. After completing the first step, it will expand (decompress) the files that it has been copied.


12. The third and fourth step will also complete instantly like the first step.


13. After that it will automatically restart after 15 seconds and continue the setup. You can also click Restart now to restart without any delays.


14. After restarting for the first time, it will continue the setup. This is the last step so it will take the most time than the previous steps.


15. It will now automatically restart again and continue the setup. You can click Restart now to restart without any delays.


16. Type your desired user name in the text-box and click Next. It will automatically fill up the computer name.


17. If you want to set a password, type it in the text-boxes and click Next.


18. Type your product key in the text-box and click Next. You can also skip this step and simply click Next if you want to type the product key later. Windows will run only for 30 days if you do that.


19. Select your desired option for Windows Updates


20. Select your time and click Next.


21. If you are connected to any network, it will ask you to set the network’s location.



• Windows 95/98/ME Vista (obsolete)• Windows NT Workstation / Windows 2000 Professional (obsolete)• Windows XP (Legacy)• Windows 7 (Legacy)• Windows 8 / Windows 8.1 (Current)• RedHat Enterprise Linux Desktop• SuSE Desktop• Ubuntu Desktop• LinuxMint


GROUP 1: WINDOWS 8

GROUP 2: RED HAT ENTERPRISE LINUX DESKTOP

GROUP 3: SuSE LINUX

GROUP 4: UBUNTU DESKTOP

GROUP 5: LINUXMINT

GROUP 6: MACINTOSH

Date post:	27-Jan-2017
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Ch1 Introduction to operating system

Education