computer software industry and I will be available to meet

Computer Software and
Operating System
9/14/2023
1
Unit 3 Class-XI SD

In this chapter, you will be learning about followings
 Software and its types
 Concept of Operating system
 Types of operating system
Topics to be covered:
 Concept of software
 Concept of operating system
 Role of OS
 Window OS
 Open source OS
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Unit 3 Class-XI SD
2

 Software is a set of instructions, data or programs used to operate
computers and execute specific tasks.
 Software is the collection of computers programs, procedures and
documentation that performs different tasks on a computer
system.
 The types software are
i. system software and
ii. application software.
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Unit 3 Class-XI SD 3

System software is computer software designed to operate the
computer hardware and to provide a platform for running application
software. It is a collection of operating systems, device drivers, utility,
etc.
Some common types of system software are given below:
 Operating System
 Utility software
 Language processor
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Operating System
An operating system is a collection of programs that controls the overall operation
of the computer system. It acts as an interface between user and hardware.
Examples: Windows XP, Windows 7, Unix, Linux etc.
Utility Software
Utility software help to manage, maintain and control computer resources. These
programs are available to help you with the day to day chores associated with
personal computing and to keep your system running at peak performer. Some
Examples of Utility Software:
 Virus Scanning Software
 Backup Software
 Scan Disk
 Disk Defragmenter Software etc
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Language Translator
It is a special type of computer system software that can
use to translate the program written in high level and
assembly language into machine level language.
It is most compulsory for low level language and high
level language.
The types of language translator are given below:
Compiler
Interpreter
Assembler
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The program which is designed to perform only specific task is
called application software.
The application software made for one purpose can not perform
other task.
For example: - accounting of your college can not prepare the
result sheet of your college.
Application system works on system software.
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There are two types of application software.
Customized or Tailored software:
Tailored software is specific purpose software. These types of software are
developed for specific tasks. They are written in high level language such as
JAVA, C, and C++ etc. Examples Banking software, Hospital Management
Software etc
Packaged Software:
Packaged software is mainly designed by software companies to generalize
the tasks. They are general purpose software. Some common types of
packaged software are as follows.
Word processing Software Eg: MS-Word
Database software Eg: MS-Access, Oracle etc
Spreadsheet Software Eg: MS-Excel
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WEB BASED SOFTWARE
 Web based software, (or a web-based application) is a type of software that
runs on a server (computer connected to the Internet), while users connect to
it from their computers using an Internet browser.
 Web based software is used by consumers and businesses like: webmail, social
networking sites, online shops,etc.. Business services are also very popular:
from office suite (G suite) to online collaboration, accounting and CRM.
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• Web-based software is type of software that you
use over the internet with a web browser.
• You don’t have to install anything, download any
software, or worry about upgrades.
• If you use an online bank or web-based email
program like Gmail, Hotmail, or Yahoo Mail,
you’re already using web-based software

MOBILE APPLICATION
 A mobile application, most commonly referred as app, is a type of
application software designed to run on a mobile device, such as a
smartphone or tablet computer.
 Mobile applications frequently serve to provide users with similar services
to those accessed on PCs. Apps are generally small, individual software
units with limited function.
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• The use of app software was originally
popularized by Apple Inc. and its App Store,
which offers thousands of applications for the
iPhone, iPad and iPod Touch.
• A mobile application also may be known as an
app, web app, online app, iPhone app or
smartphone app.
https://youtu.be/BTB86HeZVwk

An operating system is an integrated set of programs that controls the resources (the
CPU, memory, I/O devices etc.) of the computer system.
It provides an interface to its users and machine.
Making a computer system more convenient to use and managing the resources of
the computer system there are two primary objectives of an operating system.
An operating system is a collection of programs that controls the overall operation of
the computer system.
Operating system plays a role of interface between the user and computer hardware.
Examples of operating systems are: MS-DOS, Windows XP, Windows 7, Windows
Vista, Linux, Mac OS, and UNIX etc.
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 The organization or architecture of OS deals with its the internal structure ,
mainly it is divided into 3 layers as shown as figure below:
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Hardware
Kernel
Utility Software
Application Software

Operating system provides life to the computer hardware.
The increased processing speed of the processor and its problem solving
capacity created the need for more efficient modes of operating computers.
The primary role of an operating system is to maximize the productivity of a
computer system by operating it in the most efficient manner and minimizing
the amount of human intervention.
It performs basic tasks, such as recognizing input from the keyboard, sending
output to the display screen, keeping track of files and directories on the disk
and controlling peripheral devices such as disk drives and printers.
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Some of the roles of operating system are as follows:
It acts as an intermediate between program and computer hardware
Operating systems loads program in the main memory when power is turned
on.
It performs basic operations i.e. recognize input from the input unit and after
processing sends output to the output unit.
It manages data, files and memory such as primary, secondary etc.
It manages scheduling process and provides the tasks to different peripheral
devices.
Operating systems also allow users to share data and software among
themselves.
It prevents the system from unauthorized users, computer viruses etc.
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The functions of operating systems are:
1. Input Output (I/O) management:
OS manages the input and output unit of computer. This applies to the
flow of data among computers, terminals and other devices such as
monitors, printers etc.
2. Command Interpreter:
The command Interpreter takes a command from the user and then OS
translates it into a detailed set of instructions, which computer can
understand easily. So, main function of command interpreter is to get
and execute the user specified command. In the MS-DOS, command.com
is a command interpreter.
3. Data management:
OS software also manages the storage and retrieval of data. Data
management keeps track of the data on the disk, tape, optical storage
device.
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4. File management:
File management creates a mechanism of files and directories (folder)
by making a table of each file and directories in the storage device, so
as to keep track of each element.
Then it implements different type efficient searching mechanism of
files. So, this module is responsible for data storing and retrieving.
The operating system like windows manages the disk with FAT,
FAT32 or NTFS file system. FAT is the short forms of the File
Allocation Table.
The FAT has the information about the file name, file size, date and
time creation and allocation on the disk spaces.
NTFS stands for New Technology File System. It has several
important over FAT and support for the use of advanced data
structure improve performances, reliability and disk space utilization,
plus additional extensions such as security.
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5. Memory management:
Computer system includes number of storage device like registers,
cache memory, primary memory, secondary memory etc.
Whenever processor needs some data or instructions, it is first
searched in registers and then after cache memory, if it isn’t available
there, then it looks into the primary memory (RAM).
If still not available, then data is brought into the main memory from
hard disk.
So, the way of loading, accessing and removing the data from these
devices are managed by the operating system.
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6. Job Management:
It manages the jobs waiting to be processed.
It recognizes the jobs, identifies their priorities, determines whether
the appropriate main memory and secondary storage capability they
require is available or not, and schedules and finally runs each job at
the appropriate format.
Job management uses such type of process which is called scheduling.
The technique of maximum utilization of process is termed as CPU
scheduling. Some scheduling algorithms are First Come First Serve,
Shortest Job First, Priority Scheduling, Round Robin Scheduling etc.
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7. Process Management: -
The CPU of any computer system is called a processor.
Main activities of process management are job queuing, job scheduling,
keeping track of the status of each process etc.
When multiple processes are running, some process may demand the
input/output devices. In such case the process goes to the blocked state
until the devices is available.
8. User Interface:
An interface is a set of commands or menus through which a user
communicates with a program.
There are two types of OS based on user interface: GUI and CUI.
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9. Interrupt-handling:
Interrupt is an event alters the sequences in which the processor executes
instructions.
There are two interrupt one is hardware interrupt and another is software interrupt.
Hardware interrupt is caused by hardware devices such as keyboard, printer, chips
etc.
A software interrupt is generated by the processor executing specific instructions. It
is caused by programs or software device like ROM BIOS.OS provides interrupt-
handling procedure to run the computer very effectively.
10.Deadlock Prevention:
Sometimes, during a process, a situation is arises in which resource either hardware
or software, shared by two or more processes cannot continue because the resource
required by a process is held by another resource. In this situation, both jobs are
conflict by resources.
So, such type of situation or condition is called deadlock.
For examples: - If program “A” captures hard disk and ask for printer to print, and
program “B” captures printer and ask for hard disk to write, then such condition
creates deadlock. Such conditions are avoided by OS, taking suitable action by careful
allocation of resources. 9/14/2023

11.Security Management:
One of the major tasks of OS is to secure the data and program while loaded
into the memory.
Any program does not allow capturing data space of other program.
It maintains memory of each program. It protects hardware and software from
improper use.
12.Virtual Storage Management:
As we know, in multiprogramming more than one jobs are loaded in main
memory at a time. But if the program is larger than main memory (RAM), then
entire job cannot be loaded at once inside the memory. So, in this case, the OS
uses free space of secondary memory, which is known as virtual memory.
With this software it is possible to increase the capacity of main memory
without actually increasing its size.
This is accomplished by breaking a job into sequences of instructions, called
pages or segments, of RAM and keeping only a few of this in memory at a time.
Then, the remainder memory is kept on secondary storage devices.
https://youtu.be/0ZjkUMKy6x0
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Multiprogramming: -
Multiprogramming allows execution of two or more programs in a main
memory of the computer.
In this environment, processor processes several programs simultaneously.
All the programs are kept in the job pool of the mass storage device and these
programs are ready for processing but if CPU is busy, these programs wait
their turns.
When one processing is completed, next ready program is fetched from main
memory for processing.
Different forms of multiprogramming OS are multitasking, multiprocessing
and multi-user.
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Multitasking: -
A system able to process a number of tasks i.e
multitask at a time is called Multitasking.
It allows more than one program to run concurrently.
In multitasking, only one CPU is involved, but it
switches from one program to another so quickly that it
gives the appearance of executing all of the programs at
the same time.
For example: - a user could be running a word
processing package, printing a document, copying files
to disks etc
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Multiprocessing: -
Multiprocessing refers to a computer system’s ability to
support more than one process (program) at the same
time.
Multiprocessing systems are much more complicated
than single-Process system, because the OS must
allocate resources to computing process in a
reasonable manner.
It also refers to the utilization of multiple CPUs in a
single computer system.
This is also called parallel processing.
MVS (Multiple Virtual System/Storage) and UNIX are
two most commonly used multiprocessing operating
system.
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DISTRIBUTED OPERATING
SYSTEM
A DOS is a system which contains multiple components
located on different machines, which coordinate and
communicate actions in order to appear as a single coherent
working system to the user.
It is a recent advancement in the technological world of
computers.
A distributed operating system (DOS), are systems which
model where distributed applications are running on multiple
computers, linked by communications.
Processors in a DOS communicate with each other through
various communication lines like high-speed buses.
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In general, Windows Operating System
provides an interface between user program
and the computer system’s hardware. Microsoft
windows are based on multitasking principle.
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Graphical User Interface (GUI)-Windows Based Operating
System:
 GUI allows user to enter commands by pointing and clicking at
objects that appears on the screen.
 It supports WIMP(window, icon, menu, pointer) environment.
 The main advantage of GUI is that it is easy to use.
 The disadvantage of GUI is the amount of memory space they
need.
 It needs a lot of RAM and hard disk space to run.
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 GUI is graphical and user friendly.
 Users don’t have to remember syntax and commands.
 It needs large amount of memory space.
 It runs other windows based programs like MS-Word, Excel etc.
 It needs faster processor to operate.
 By using GUI, easy to play games and easy to use images.
 In GUI, other peripherals like mouse, light pen, joystick can be
used.
 GUI based OS are usually 32 or 64 bit operating system.
 It supports multimedia environment.
 It supports multitasking, multiprogramming, multithreading etc.
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Different components supported by GUI:
Menu: - The program menu is a list of commands or
instructions that tells your computer to perform an
action such as opening program or saving
documents etc.
Desktop: - The desktop is a container in which
program icons and other interface components are
arranged in attractive ways.
Icons: - A small image displayed on the screen to
represents an object is called icon.
Window: - A window based program opens in a
screen in a rectangular frame called Window.
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OPEN SOURCE OPERATING SYSTEM
 Open source is a methodology or approach towards the design and
development of software with the intention of giving the user to access
the source code.
 If we use open source software, not only we will be able to use it but also
will be able to see how it works, debug it, modify it and redistribute it.
 Open source software is licensed in a way that makes it legal to use as
many copies of it as you want, and wherever you want.
 That software usually uses less resource than its commercial
counterpart because they don’t have any code for licensing,
authentication and promoting other products to attach an advertisement
etc.
 There is a core difference between open source and free software, since
both represent the same core idea.
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Open source allows the commercial utilization of the code
with the motive of profits.
Many companies such as Red Hat gain significant revenue
from sales, distribution, maintenance and consultancy
services provided by open source software.
However, free software cannot be used for commercial
purpose.
Being an open source program, the program codes of an
open source operating system are available.
The user can modify those codes and develop new
applications according to his/her requirements.
Some common examples of open source (OS) are Linux,
Minix, Free Open Solaris, FreeDOS,etc.
https://youtu.be/1ehpgbb3XD0
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 UNIX was earlier known to be UNICS, which stands for UNiplexed
Information Computing System.
 UNIX is a powerful, flexible and manageable OS with good utilities and
communication abilities.
 It is multiuser, multitasking and multiprocessing operating system.
 It was used in bigger size machines like mainframe and
minicomputers.
 It was developed in AT& Bell labs around 1970.
 The development of UNIX has given birth to many operating systems
that can work on different types of computers.
 For example, UNIX has developed in ‘C’ and assembly language.
 Many of the popular commercial operating system e.g. Linux, Xenix,
HP UNIX, SUN OS etc. has inherited its main features.
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 LINUX stands for Lovable Intellect Not Using XP
 Linux is an open source powerful UNIX-based OS.
 It's OS runs on a variety of platforms, including Intel, SPARCE,
PowerPC and DEC Alpha processors as well as multiprocessing
systems.
 It was developed by Linus Torvalds, at the University of Helsinki in
Finland as a college project. He released the version of Linux,
including all source code.
 With the help of literally thousands of volunteers all over the world,
Linux grew dramatically.
 It is multi-user, multitasking, multiprogramming OS, mainly popular
for server systems.
 It is distributed through different distributors such as Red Hat,
Ubuntu,, OpenSolaris, etc,
https://youtu.be/7L5JMj82vYU
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Spooling:
 The term spooling is derived from the term SPOOL(Simultaneous peripheral
operation On-line).
 A spool is a buffer used in spooling.
 Spooling is a process used to balance the difference of high-speed of the CPU and
slow speed of the input/output devices.
 It is primarily used for printing purpose. When we provide multiple files to print
together to a printer, although the printer can print one file at a time. But, all files
get lined up in a queue and get printed one-by-one.
 In this process, CPU remains free and the user can work on other applications. This
technique of printing is possible through a capability of the operating system known
as spooling.
 Here, the spooling technique is used which allows the processed jobs in the CPU to
be arranged in a separate area in the memory known as spooling area and the CPU
remains free for other jobs.
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Process:
 A process is basically a program in execution.
 The process doesn’t mean Program. The Program is static while a process
is dynamic. For simplicity, we can define a program as a job that resides
in the secondary storage.
 A process is a program, which is currently in a running/ ready state.
 A process in a computer system may be in one of a number of different
possible states, such as
Running: A process is said to be in running state if it is currently
executing.
Ready: A process is said to be ready if it is temporarily stopped to let
other process run in the processor.
Blocked: A process is said to be in blocked state if it is unable to run until
some external event happen.
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Buffering:
 A buffer is a small, high-speed storage device, located in I/O units,
used to hold data at the time of input/output operations.
 So it is divided into the input buffer and output buffer.
 Input buffer accepts data at low speed and release at high speed to
CPU, output buffer works in reverse order, it accepts data at high
speed from main memory and releases at low speed to output devices.
 Buffering is the process of using buffer during I/O operation.
The term buffering is also used while accessing files like audio/video
through the internet.
Here, it is the process of holding downloaded data before it can be
played.
Buffering is used to :
Cope with the difference in operating speed between different
devices.
Adopt between devices that have different data transfer sizes.
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