3. Definition of Computer
A computer is an electronic machine that accepts information (Data),
processes it according to specific instructions, and provides the results as
new information
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4. Earliest Computer
Originally calculations were computed by humans, whose job title was computers.
These human computers were typically engaged in the calculation of a mathematical
expression.
The calculations of this period were specialized and expensive, requiring years of
training in mathematics.
The first use of the word "computer" was recorded in 1613, referring to a person
who carried out calculations, or computations, and the word continued to be used in
that sense until the middle of the 20th century
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Tally Sticks
A tally stick was an ancient memory aid device to record
and document numbers, quantities, or even messages.
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Abacus
โข An abacus is a mechanical device used to aid an individual in
performing mathematical calculations.
โข The abacus was invented in Babylonia in 2400 B.C.
โข The abacus in the form we are most familiar with was first
โข used in China in around 500 B.C.
โข It used to perform basic arithmetic operations.
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Difference Engine and Analytical
Engine
Itโs an automatic, mechanical calculator designed to tabulate
polynomial functions.
Invented by Charles Babbage (Father of Computer) in 1822 and
1834.
It is the first mechanical computer
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First Computer Programmer
In 1840, Augusta Ada Byron suggests to Babbage that he use the
binary system.
She writes programs for the Analytical Engine.
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Harvard Mark 1
Also known as IBM Automatic Sequence Controlled Calculator
(ASCC).
Invented by Howard H. Aiken in 1943.
The first electro-mechanical computer.
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Z1
โข The first programmable computer.
โข Created by Konrad Zuse in Germany from 1936 to 1938.
โข To program the Z1 required that the user insert punch tape into
a punch tape reader and all output was also generated through
punch tape.
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Atanasoff-Berry Computer (ABC)
โข It was the first electronic digital computing device.
โข Invented by Professor John Atanasoff and graduate student Clifford Berry
at Iowa State University between 1939 and 1942.
Atanasoff-Berry
Computer
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ENIAC
ENIAC stands for Electronic Numerical Integrator and
Computer.
It was the first electronic general purpose computer.
Completed in 1946.
Developed by John Presper Eckert and John W. Mauchly
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UNIVAC 1
The UNIVAC I (UNIVersal Automatic Computer 1) was the
first commercial computer.
Designed by J. Presper Eckert and John Mauchly
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EDVAC
EDVAC stands for Electronic Discrete Variable Automatic
Computer.
The First Stored Program Computer
Designed by Von Neumann in 1952.
It has a memory to hold both a stored program as well as data
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The First Computer Company
The first computer company was the
Electronic Controls Company.
Founded in 1949 by J. Presper Eckert and John Mauchly
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Computer Generations
There are five generations of computer:
First Generation โ 1946 โ 1958
Second generation โ 1959 โ 1964
Third generation โ 1965 โ 1970
Fourth generation โ 1971 โ 1980
Fifth generation โ 1980 to future
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The First Generation
The first computers used vacuum tubes for circuitry and
magnetic drums for memory, and were often enormous,
taking up entire rooms.
They were very expensive to operate and in addition to
using a great deal of electricity, generated a lot of heat,
which was often the cause of malfunctions.
First generation computers relied on machine language,
the lowest-level programming language understood by
computers, to perform operations, and they could only
solve one problem at a time.
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The Second Generation
Transistors replaced vacuum tubes and ushered in the second
generation of computers.
One transistor replaced the equivalent of 40 vacuum tubes.
Allowing computers to become smaller, faster, cheaper, more
energy-efficient and more reliable.
Transistor
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The Third Generation
The development of the integrated circuit was the
hallmark of the third generation of computers.
Transistors were miniaturized and placed on silicon chips,
called semiconductors, which drastically increased the
speed and efficiency of computers.
Much smaller and cheaper compare to the
second generation computers
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The Fourth Generation
The microprocessor brought the fourth generation of computers,
as thousands of integrated circuits were built onto a single
silicon chip.
As these small computers became more powerful, they could be
linked together to form networks, which eventually led to the
development of the Internet.
Fourth generation computers also saw the development of GUIs,
the mouse and handheld devices
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The Fifth Generation
based on Artificial Intelligence (AI)
Still in development.
The use of parallel processing and superconductors is helping to
make artificial intelligence a reality.
The goal is to develop devices that respond to natural language
input and are capable of learning and self-organization.
There are some applications, such as voice recognition, that are
being used today
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Classification of Computers
There are three major categories based on which computers
can be classified. These are:
1. Based on Size
2. Based on Purpose
3. Based on Types
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Based on Types
Types of Computer-Based on
Types
Analog Computer โSuch computers are mostly used for scientific
and industrial applications. Examples of Analog computers include
Thermometer, Operational Amplifiers, Electric Integrators, etc.
Digital Computer Examples of Digital computers are Desktop,
Laptop, Mobile Phones, etc.
Hybrid Computer โFew important examples of Hybrid Computers
include Space Flights, Food processing Plants, etc.
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Based on Size
Micro Computers โExamples include Desktop, Laptop, etc.
Mini Computer โ Developed in the mid-1960s,. For example
Smartphones, iPads, etc.
Mainframe Computer -For example, the system used at
Trading companies.
Super Computer โ Computers used at Organisations dealing
with Weather forecasting, Quantum Mechanics, Climate
research, etc., where high level of performance has to be
justified are called Super Computer
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Based By Purpose
General Purpose โ Based on General Purpose, there are these following functions
which a device is expected to perform:
1. Basic Input/Output functions
2. 2. Calculations
3. 3. Data Saving on a smaller scale
4. 4. General performing activities.
Special Purpose โ When a computer is designed specifically to perform a certain
function, such type of computers is known as Special Purpose computer. These
types may include:
1. Thermometers to test temperature
2. Generators to manage electricity
3. Devices used for analysing Climate Change
4. Large computers for IT Companie
5. Machines used at Manufacturing Units and the list goes on and on.
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Components of a Computer System
Are the primary elements which make the functioning of an electronic
device smooth and faster. There are five basic components which include:
โข Input Unit: Keyboard
โข Output Unit: Printer
โข Central Processing Unit (CPU)
โข Memory Unit: The entered information immediately gets saved
in the memory unit.
โข Control Unit: Centre of all processing actions
โข Arithmetical and Logical Unit: The ALU comprises circuits using
which addition, subtraction, multiplication, division and other
numerical based calculations.
