Chapter 1.pptx

INTRODUCTION TO
COMPUTING
CHAPTER - 1

INTRODUCTION OF COMPUTER
Computer is
1. An electronic device that stores, retrieves,
and processes data, and can be programmed
with instructions.
2. A computer is composed of hardware and
software, and can exist in a variety of sizes and
configurations.

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 During the processing the computer has to perform
various functions like
(i) Accepting Instructions & data from the user.
(ii) Performing various arithmetic and Logical operations
as per Instructions given.
(iii) Presenting the Information or Output to the user.

CHARACTERISTICS OF A COMPUTER
The Characteristics which make computer indispensable are:
1) Speed :- The computer is able to process the date and give the
output in fractions of seconds such that required information is
given to the user on time enabling the user to take right decisions
on right time. A powerful computer is capable of executing about
3 million calculations per second.
2) Accuracy :- Inspite of its high speed of processing, the computers
accuracy is consistently high enough which avoids any errors. If it all
there are errors, they are due to errors in instructions given by the
programmer.

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3) Reliable :- The output generated by the computer is very reliable,
but it is reliable only when the data, which is passing as input to the
computer and the program, which gives instructions are correct and
reliable.
4) Storage Capacity :- The computer has a provision to store large
volumes of data in the small storage devices, which have capacity to
store huge amounts of data and help the retrieval of data an easy
task.

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5) Versatile :- The computer perform three basic
operations
1) It is capable to access and accept information through
various input-output devices from the user.
2) It performs basic Arithmetic and Logic operations on
data as desired.
3) It is capable to generate the desired output in the
desired form.

6) Automation :- Once the instructions fed into
computer it works automatically without any
human intervention until the completion of
execution of program until meets logical
instructions to terminate the job.
7) Diligent :- The computer performance is
consistent even to all extent of more than 10
million calculations, it does each and every
calculation with same speed and accuracy.

LIMITATIONS OF COMPUTER
1) Computer does not work on itself, it requires set
of instructions to be provided, else computer
(Hardware) is waste.
2) Computer are not intelligent, they have to be
instructed about each and every step which
they have to perform
3) Computers cannot take decisions on its own,
one has to program the computer to take an
action if some conditional prevail.
4) Computers, unlike humans cannot learn by
experience.

HISTORY OF COMPUTER
 Until the development of the first generation
computers based on vacuum tubes, there had been
several developments in the computing technology
related to the mechanical computing devices. The
key developments that took place till the first
computer was developed are as follow:
1. Calculating Machines- ABACUS was the first
mechanical calculating device for counting of large
numbers. The word ABACUS means calculating board.
It consists of bars in horizontal positions on which sets
of beads are inserted. The horizontal bars have 10
beads each, representing units, tens, hundreds, etc. An
abacus is shown in Figure 1.1

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2. Napier’s Bones was a mechanical device built for
the purpose of multiplication in 1617 AD. by an
English mathematician John Napier.
3. Slide Rule was developed by an English
mathematician Edmund Gunter in the 16th century.
Using the slide rule, one could perform operations
like addition, subtraction, multiplication and division. It
was used extensively till late 1970s. Figure 1.2 shows a
slide rule.

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4. Pascal’s Adding and Subtraction Machine was
developed by Blaise Pascal. It could add and subtract.
The machine consisted of wheels, gears and cylinders.
5. Leibniz’s Multiplication and Dividing Machine was a
mechanical device that could both multiply and divide.
The German philosopher and mathematician Gottfried
Leibniz built it around 1673.

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6. Punch Card System was developed by Jacquard to
control the power loom in 1801. He invented the
punched card reader that could recognize the
presence of hole in the punched card as binary one
and the absence of the hole as binary zero. The 0s
and 1s are the basis of the modern digital computer.
A punched card is shown in Figure 1.3.

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7. Babbage’s Analytical Engine An English man
Charles Babbage built a mechanical machine to do
complex mathematical calculations, in the year
1823. The machine was called as difference engine.
Later, Charles Babbage and Lady Ada Lovelace
developed a general-purpose calculating machine,
the analytical engine. Charles Babbage is also called
the father of computer.
8. Hollerith’s Punched Card Tabulating Machine was
invented by Herman Hollerith. The machine could
read the information from a punched card and
process it electronically.

THE COMPUTER GENERATIONS
The development of computers has followed different
steps in the terminology used and these steps of
technological differences are called as
GENERATIONS in computer terminology. There are
totally five generations of computers till today.
1. First Generation Computers (1950's) :
These computer which used vaccum tubes (valves) as
major electronic component the advantage of
vaccum tubes technology is that it made the advent
of Electronic digital computer vaccum tubes were
only electronic devices available during those days
which made computing possible.

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2. Second Generation Computers (1960's) :
With the development of Transistors and there use in
circuits, magnetic core for memory storage, the
vaccum tubes are replaced by transistors to arrive at
2nd generation of computers. The size of transistors
is much smaller when compared to vaccum tubes,
they consume less power, generated less heat and
faster and reliable.
Advantages : (1) Size of Computer has come down as
well as power consumption.
(2) The Cost of Computer reduced.

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Third Generation Computers (1970's) :
The development of silicon chips, the third generation
of computers came into existence. These computers
are used Integrated Circuits (IC's) of silicon chips, in
the place of transistors. Each of these IC's consist of
large number of chips in very small packages.
Advantage : The size of computers, cost, heat
generation and power consumption decreased to
great extent, speed and reliability increased as
compared to previous generation. These machines
used IC's with large scale Integration (LSI).

Fourth Generation (1980's) :
The Computers belonging to these generations used
Integrated
circuits with Very Large Scale Integration (VLSI).
Advantages : 1) These computers have high processing
powers, low maintenance, high reliability and very low
power
consumption.
2) The size & cost of computers come down drastically
Fifth Generation (Late 1990's) :-
These computers use optic fiber technology to handle
Artificial Intelligence, expert systems, Robotics etc.,
computers have very processing speeds and are more
reliable.

TYPES OF COMPUTERS
Computers in general can be classified into major
categories based on.
(a) According to the purpose of the computer.
(b) According to the operation size of computer.
(a) Classification as per purpose of the computer :
Classification of digital computer as per the purpose
of their use
1. General purpose digital computers.
2. Special purpose digital computer.

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1. General Purpose digital computers : These
computers are theoretically used for any type of
applications. These computers can be used in
solving a business Problem and also used to solve
mathematical equation with same accuracy and
consistency. Most of the computer now are
general purpose digital computers. All the P.C's,
which have become household affair.
2. Special Purpose Computers : These digital
computer are designed, made and used for any
specific job. These are usually used for those
purposes which are critical and need great accuracy
and response like Satellite launching weather
forecasting etc.

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(b) According to size and capabilities
1. Super Computers
2. Main frame Computer
3. Medium scale Computer
4. Mini Computers
5. Micro Computers.
(1) Super Computers : These computers are characterized
as being the fastest, with very high processing speed,
very large size, most powerful. There are widely used in
complex scientific applications like processing geological
data, weather data, genetic engineering etc.
These computers with 16 microprocessors, will
recognize words upto length 64 bits and more. The
speed of calculation is upto 1.2 billion
instructions/second, and they can take input from more
than 1000 individual work station.
Ex. PARAM developed in India.

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(2) Mainframe Computers : These Computer will has
capability to support many peripheral devices and
terminals, which can process several Million
Instructions / second (MIPS), as well which support
1000 remote systems, these computers are mostly
used for Railway reservation etc.
(3) Medium Scale (size) Computers : These
computers are mini versions of mainframe
computers, they are relatively smaller than
mainframes and have less processing power than
Mainframes their processing speed support up to
200 remote systems.

(4) Mini Computers : These computer are smaller and
less expensive than Mainframe and medium sized
computers. They are relatively faster it can support
about 10-20 user terminals. These computers are
generally easy to use. They can handle database,
statistical problems Accounting etc.
(5) Micro Computer : These are the mostly used
category of computes called as personal computers
(PC's). The word Micro suggests only the size, but
not the capacity. They are capable to do all input -
output operations. They can also be connected to
peripheral devices.

HARDWARE
 The term hardware refers to the physical
components of your computer such as
the system unit, mouse, keyboard,
monitor etc.

SOFTWARE
 The software is the instructions that
makes the computer work. Software is
held either on your computers hard
disk, CD-ROM,DVD or on a diskette
(floppy disk) and is loaded (i.e. copied)
from the disk into the computers RAM
(Random Access Memory),as and when
required.
 The capability of computer depends
upon the software components.

TWO MAJOR TYPES OF SW
System SW
 Programs that generally perform the background
tasks in a computer. These programs, many times,
talk directly to the HW
Application SW
 Programs that generally interact with the user to
perform work that is useful to the user. These
programs generally talk to the HW through the
assistance of system SW
The diagram on the screen shows the
relationship between HW and these two types of
SW

FIRMWARE
 OS components that are stored permanently on
chip (ROM) and not on the disk drive
 When a computer is powered-on, firmware is the
first program that it always executes
 Firmware consists of startup and a few low-level
I/O routines that assist the computer in finding out
and executing the rest of the OS
 On IBM-compatible PC’s, it is called BIOS

UTILITIES
Computer programs that perform a particular function related to
computer system management and maintenance
Examples:
1. Anti-virus SW
2. Data compression SW
3. Disk optimization SW
4. Disk backup SW

DEVICE DRIVERS
 A computer program that facilitates the communication between
the computer and a peripheral device (e.g. printer, mouse, etc.)
 It takes the instructions and/or data from the computer and
converts them into a form that is readily understood by a
peripheral device, and vice versa

APPLICATION SOFTWARE
Application software makes computer popular
and easy to use
Common application software:
 Microsoft Word, WordPerfect
 PowerPoint
 Netscape, Internet Explorer
 PhotoShop, Photo-Paint
 Quick Time
 Dreamweaver

OPERATING SYSTEM
 Which is set of programs that controls and support
hardware and provide various services which are used
for better performance of computer . The major
functions of O.S are
1. It assigns processors to tasks
2. It manages memory and other storage areas
3. It acts as a command interpreter
4. File management
5. Input-Output Management
6. Establishing data security & Integrity
7. Maintains account of processor time for billing
purposes.
8. Provides data and time services etc.

 The Operating systems can be classified as Single
user and Multiuser (number of users working on
it at a given point of time) and Multitasking
operating systems,
1. Single user Operating systems - MSDOS
2. Multi-user Operating System - UNIX, Linux etc
3. Multitasking Operating System - Windows

OPERATING SYSTEM CONCEPTS
 User programs interact with operating system using set of
extended instructions. These instructions are called “system
calls”. These system calls are used to create, delete and use
various software objects that are manages by the Operating
systems.
The following are common in any Operating system.
1. Process
2. Files
3. System Calls
4. The shell
5. Booting Process i. Boot Strap Loader
i. Check Programs
ii. Monitor Program
iii. Basic input/output System(BIOS) Program
iv. Utility Programs
v. File Maintenance Programs

APPLICATIONS OF COMPUTERS
1. For a user, computer is a tool that provides the desired
information, whenever needed.
2. You may use computer to get information about the
reservation of tickets (railways, airplanes and cinema
halls), books in a library, medical history of a person, a
place in a map, or the dictionary meaning of a word.
3. The information may be presented to you in the form of
text, images, video clips, etc.

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1. PC at Home : Common uses for the computer within
the home
i. Computer games
ii. Working from Home
iii. Banking from Home
iv. Connecting to the Web
2. Education Computers are extensively used, as a tool and as
an aid, for imparting education. Educators use computers
to prepare notes and presentations of their lectures.
Computers are used to develop computer-based training
packages, to provide distance education using the e-
learning software, and to conduct online examinations.
Researchers use computers to get easy access to
conference and journal details and to get global access to
the research material.

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3. Entertainment Computers have had a major impact
on the entertainment industry. The user can
download and view movies, play games, chat, book
tickets for cinema halls, use multimedia for making
movies, incorporate visual and sound effects using
computers, etc. The users can also listen to music,
download and share music, create music using
computers, etc.
4. Sports A computer can be used to watch a game,
view the scores, improve the game, play games (like
chess, etc.) and create games. They are also used for
the purposes of training players.

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5. Advertising Computer is a powerful advertising media.
Advertisement can be displayed on different websites,
electronic-mails can be sent and reviews of a product by
different customers can be posted. Computers are also
used to create an advertisement using the visual and the
sound effects. For the advertisers, computer is a medium
via which the advertisements can be viewed globally.
Web advertising has become a significant factor in the
marketing plans of almost all companies. In fact, the
business model of Google is mainly dependent on web
advertising for generating revenues.

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6. Medicine Medical researchers and practitioners use computers to
access information about the advances in medical research or to
take opinion of doctors globally. The medical history of patients is
stored in the computers. Computers are also an integral part of
various kinds of sophisticated medical equipments like ultrasound
machine, CAT scan machine, MRI scan machine, etc. Computers
also provide assistance to the medical surgeons during critical
surgery operations like laparoscopic operations, etc.
7. Science and Engineering Scientists and engineers use computers
for performing complex scientific calculations, for designing and
making drawings (CAD/CAM applications) and also for simulating
and testing the designs. Computers are used for storing the
complex data, performing complex calculations and for visualizing
3-dimensional objects. Complex scientific applications like the
launch of the rockets, space exploration, etc., are not possible
without the computers.

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8. Government The government uses computers to manage
its own operations and also for e-governance. The websites
of the different government departments provide
information to the users. Computers are used for the filing
of income tax return, paying taxes, online submission of
water and electricity bills, for the access of land record
details, etc. The police department uses computers to search
for criminals using fingerprint matching, etc.

LIKES & DISLIKES OF COMPUTER
 Things computer like:
i. Good ventilation
ii. Clean environment
iii. Stable, vibration free surface
 Things computer don’t like:
i. Dust
ii. Drinking and eating over the keyboard
iii. Heat, Cold or Moisture
iv. Don’t place objects on top of monitors.
v. Don’t place floppy disks near monitors.

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