Introduction to Computer
The word “Computer” is
derived from the English word “Compute,” which means “To calculate.” In the
early stage of development, computers were mainly used for performing mathematical
calculations.
Initially,
mathematicians and scientists contributed greatly to the development of
computers because they wanted to develop machines that could solve complex
calculations quickly and accurately.
A computer is an
advanced electronic machine that can be programmed to perform arithmetic and
logical operations automatically with high speed and accuracy.
Definition :- A computer is an electronic
device that accepts data as input, processes it according to the instructions
given by the user, stores it, and produces meaningful information as output.
Or
A computer is an
advanced electronic machine that works on the principle of Input, Process,
Output, and Storage (IPOS) to perform various tasks quickly and accurately.
Advantages of Computers
1. Speed:- A computer can perform tasks at a very high speed within a short time.
2. Storage Capacity:- A computer can store a large amount of data and information in its memory.
3. Accuracy:- A computer performs tasks with a high level of accuracy and correctness.
4. Versatility:- A computer can perform many different types of tasks efficiently.
5. Automation:- A computer can perform tasks automatically after receiving instructions and data.
6. Efficiency:- A computer can work continuously for a long time without getting tired.
7. Reliability:- A computer provides reliable and dependable results when correct input is given.
8. Multiple Uses:- A computer is used in many different fields according to the requirement.
Limitations of
Computers
Along with the
advantages of computers, there are also some limitations and drawbacks of
computers.
1. Lack of Feelings:- A computer does not have emotions, feelings, or the ability to think like humans.
2. Dependence on Instructions:- A computer works only according to the instructions given by the user and cannot work on its own.
3. Lack of Decision-Making Ability:- A computer cannot take independent decisions.
4. Security Risks:- A computer can be affected by viruses, hacking, or cyber attacks if proper security is not maintained.
Uses of
Computers
Computers are being used in every sector of society in the present time. The main areas where computers are used are as follows.
1. In
the field of education
2.
In the field of medicine
3.
In the field of information technology
4.
In the field of railway and air reservation
5.
In the field of banking
6.
In the field of weather forecasting
7.
Making cartoons and animation films
8.
In different laboratories
9.
In the area of traffic control
History of Computers
The development of
computers did not happen suddenly, but it took place gradually over many years
through continuous improvements in different calculating devices and machines.
Many scientists,
mathematicians, and inventors contributed significantly to the development of
computers. Several important machines played a major role in the evolution of
modern computers.
Abacus
The Abacus was
developed in ancient times and was widely used in China, Japan, and other Asian
countries for performing mathematical calculations. It is considered one of the
earliest calculating devices used by humans.
The Abacus is a
rectangular frame made of wood or metal containing several vertical rods with
movable beads. A horizontal divider separates the rods into two parts. The upper
part is called “Heaven” and usually contains two beads, while the lower part is
called “Earth” and contains five beads. Calculations such as addition,
subtraction, multiplication, and division are performed by moving the beads up
and down on the rods.
Napier’s Bones
In 1617 AD, the
Scottish mathematician John Napier invented Napier’s Bones to simplify
mathematical calculations. It consisted of rectangular rods made of bone, wood,
or ivory on which numbers were written. This device was mainly used for multiplication,
division, and logarithmic calculations. Napier’s invention greatly reduced the
time required for complex calculations and became an important step in the
development of mechanical calculating devices.
Slide Rule
The Slide Rule was
invented in 1621 by the English mathematician William Oughtred. It is
considered one of the earliest analog calculating devices. The Slide Rule
consisted of two marked scales that could slide over each other to perform
calculations. It was mainly used for multiplication, division, roots,
logarithms, and trigonometric calculations. Before the invention of electronic
calculators, engineers and scientists widely used the Slide Rule for scientific
calculations.
Adding Machine / Pascaline
In 1642, the French
mathematician Blaise Pascal invented the Adding Machine, also known as
Pascaline. It was the first successful mechanical calculator capable of
performing arithmetic operations automatically. The machine consisted of
toothed wheels and gears connected together in such a way that rotating one
wheel affected the others. It could perform addition and subtraction quickly
and accurately. Pascal invented this machine to help his father in tax
calculations.
Leibniz Calculator
In 1672, the German
mathematician and philosopher Gottfried Wilhelm Leibniz improved Pascal’s
Adding Machine and developed the Leibniz Calculator. This machine was more
advanced because it could perform addition, subtraction, multiplication, and
division. Leibniz used a special stepped drum mechanism that made calculations
faster and easier. This invention played an important role in the advancement
of mechanical calculators and inspired future computing machines.
Multiplying Machine
In 1820, the French
engineer Charles Xavier Thomas de Colmar developed the Multiplying Machine,
also known as the Arithmometer. It was one of the first successful mechanical
calculators used commercially. This machine could perform arithmetic operations
such as addition, subtraction, multiplication, and division quickly and accurately.
It worked with the help of gears, levers, and rotating wheels. The Arithmometer
became very popular in offices and businesses because it reduced manual
calculation work and increased accuracy.
Jacquard Loom
In 1801, the French
inventor Joseph Marie Jacquard developed the Jacquard Loom, an advanced weaving
machine used for producing complex designs on cloth automatically. The most
important feature of this machine was the use of punched cards to control
weaving patterns. Each punched card contained coded instructions that directed
the machine to create specific designs. The concept of storing instructions on
punched cards later became highly important in the development of computers and
data processing systems.
Difference Engine
In 1822, the
English mathematician Charles Babbage designed the Difference Engine, a
mechanical calculating machine developed for preparing mathematical tables
automatically. The machine worked with the help of gears, shafts, and wheels
and was designed to reduce errors in calculations made by humans. It could
perform complex mathematical operations and print the results automatically.
Although the machine could not be fully completed because of lack of funds and
technical difficulties, it became an important step in the development of
modern computers.
Analytical Engine
In 1833, Charles
Babbage designed the Analytical Engine, which is considered the first concept
of a modern computer. This machine was designed to perform arithmetic
calculations and logical operations automatically. It contained components
similar to modern computers, such as a memory unit, processor, input system,
and output system. The Analytical Engine was also designed to use punched cards
for instructions and data storage. Because of this revolutionary design, Charles
Babbage is known as the “Father of Modern Computer.”
Census Tabulator
In 1890, the
American inventor Herman Hollerith invented the Census Tabulator to process
census data quickly and accurately. This machine used punched cards and
electricity for data processing. It could sort, count, and record large amounts
of information much faster than manual methods. The machine was successfully
used during the United States census and greatly reduced the time required for
data analysis. Later, Hollerith established the Tabulating Machine Company,
which eventually became IBM, one of the world’s leading computer companies.
Mark I
In 1944, Howard Aiken and engineers of IBM developed the Mark I computer, also known as the Automatic Sequence Controlled Calculator (ASCC). It was the world’s first large-scale electromechanical computer capable of performing calculations automatically. The machine used both electrical and mechanical components and could solve complex mathematical problems much faster than humans. Mark I was mainly used during World War II for scientific research and military calculations. It was about 50 feet long and operated continuously for long periods without interruption.
Generations of Computers
The development of
digital computers is classified into five generations on the basis of hardware
technology, electronic components, and processing capability. Each new
generation introduced better speed, storage capacity, reliability, and advanced
features than the previous generation.
First Generation Computers:- The first
generation of computers used Vacuum Tubes as the main electronic component. The
period of this generation is considered from 1945 to 1955. These computers were
very large in size, consumed a large amount of electricity, and generated
excessive heat. ENIAC, EDVAC, EDSAC, and UNIVAC were the major computers of
this generation. Machine language and binary codes were mainly used for
programming.
Features of First Generation Computers
1- Vacuum tubes were
used as the main electronic component.
2- These computers
were very large in size.
3- They consumed a
large amount of electricity.
4- They generated
excessive heat during operation.
5- Their speed was
comparatively low.
6- Machine language
and binary language were used for programming.
7- These computers
were less reliable and required frequent maintenance.
Second Generation Computers:- In second
generation computers, Transistors replaced Vacuum Tubes. The period of this
generation is considered from 1956 to 1963. Transistors were smaller, faster,
more reliable, and consumed less electricity than vacuum tubes. Due to this
improvement, second generation computers became smaller in size and more
efficient. High-level programming languages such as FORTRAN, COBOL, and ALGOL
were introduced during this generation.
Features of
Second Generation Computers
1- Transistors were
used instead of vacuum tubes.
2- These computers
were smaller in size.
3- They consumed
less electricity and produced less heat.
4- Their speed and
storage capacity increased.
5- These computers
were more reliable than first generation computers.
6- High-level
languages such as FORTRAN, COBOL, and ALGOL were used.
Third Generation Computers:- The third generation of computers used Integrated Circuits (ICs) instead of transistors. The period of this generation is considered from 1964 to 1971. Integrated circuits made computers smaller, faster, cheaper, and more reliable. During this generation, operating systems and multiprogramming concepts were also introduced. Keyboards, monitors, and other input-output devices became common in computers.
Features of
Third Generation Computers
1- Integrated
Circuits (ICs) were used.
2- These computers
were smaller and more reliable.
3- Their speed and
storage capacity increased significantly.
4- Keyboards and
monitors were commonly used.
5- Operating
systems were introduced.
6- BASIC and other
modern programming languages were used.
7- These computers
were cheaper than earlier generations.
Fourth Generation Computers:- The fourth
generation of computers is based on Microprocessor technology. LSI (Large Scale
Integration) and VLSI (Very Large Scale Integration) technology were used in
this generation. This generation started around 1971 and led to the development
of personal computers (PCs). Computers became very small, fast, reliable, and
affordable. Modern input and output devices such as mouse, printer, scanner,
and graphical user interfaces became widely used.
Features of
Fourth Generation Computers
1- Microprocessor
technology was introduced.
2- LSI and VLSI
technology were used.
3- Computers became
very small and portable.
4- Their speed and
storage capacity increased greatly.
5- Modern
programming languages were used.
6- Mouse, printer,
scanner, and GUI technology became common.
7- Personal
computers became popular during this generation.
Fifth Generation Computers:- The fifth generation of computers is based on Artificial Intelligence (AI), machine learning, and advanced semiconductor technology. This generation started around 1985 and continues to the present time. Scientists are developing intelligent computers that can understand natural language, recognize speech, make decisions, and solve complex problems automatically. Modern technologies such as robotics, expert systems, cloud computing, and AI-based applications are examples of fifth generation computing.
Features of
Fifth Generation Computers
1- Artificial
Intelligence (AI) technology is used.
2- These computers
are extremely fast and powerful.
3- They can process
large amounts of data quickly.
4- Natural language
processing and speech recognition are possible.
5- Robotics and
machine learning technologies are used.
6- These computers are capable of intelligent
decision-making.
7-
The present era is called the Digital Age because of the widespread use of
computers.