These slides will help you to understand the evolution of computers from old ones to modern ones and the history of them will improve your knowledge about computers.

2. • “To perform reasonable, calculation and logical maneuver we
use an electronic machine identified as computer”.
• Succession of input and production of output.
• A computer can stock and recover a huge amount of data.

3. • Early computers were comprehended as only calculating
devices like mathematical calculations. Due to absenteeism of
electricity all data processing was manual.
• Many years of trainings was required in this period, its
calculation was luxurious and vast.

4. • It was an ancient device which was used to record the
quantities, messages and numbers of documents in
memory.
• First seemed as bones engraved
with marks.
• Slide rule was basically used for addition or subtraction.
• It was used to perform Logarithm, Square roots, Divide,
Multiply, and Trigonometry.

5. • It was conceived by John Napier in 1614.
• It was also known as ‘rabdology’.
• Decimal point was firstly
used in this device.
• It is considered as the first computer and also known as
Soroban.
• It was the first computing device
which was developed in 600 BC
by Chinese.

6. • It was invented in 1642 by Blaise Pascal.
• It was a ‘first calculator’
which works by using gears.
• It is also named as
arithmetic or adding machine.
• It was invented in 1672 Gottfried Wilhelm Leibniz.
• A ‘mechanical calculator’ was based on fluted drums.
• Addition, subtraction, division and multiplication.

7. • Logarithm tables (table
of numbers) were
solved by it.
• Polynomial functions
were tabulated from it.
• It was able to solve any
mathematical difficulty.
• It was consisted of two
parts ‘store’ and ‘mill’.

8. • Augusta Ada Byron invented it.
• She worked on the analytical
engine of Babbage.
• Programs for analytical
engine were written by her.
• Herman Hollerith in 1890 invented it.
• It was an electromechanical machine.
• It became International Business Machine (IBM) later.

9. • As the population increased and people started longing for
smart devices for their work.
• They invented many devices which could be easily used and
economically useable.
• This period started from 1940.

10. • It was designed in 1943 by Howard H. Aiken.
• It was “First Electro-mechanical computer”.
• Advantages: For addition of any two numbers 0.3 seconds
were required.
• For multiplication of
any two numbers 4.5
seconds were required.
• Disadvantages: Its size was very big and
design was extremely complex, due to which its working was
slow.

11. • ENIAC stands for Electronic Numerical Integrator and
Calculator.
• It was discovered by John Presper Eckert and his colleague
John W. Mauchl in 1946.
• The basic reason for
evolving it was for the
necessity of military.
• Features: 18,000
punch-cards were
used as input.

12. • EDSAC stands for Electronic Delay Storage Automatic
Calculator.
• It was invented in England by Maurice Wilkes.
• It was second electronic digital stored program computer.
Features:
• For memory storage
it used lines of mercury delay.
• Electricity of 11KW was used.
• For logics vacuum tubes were used.

13. • UNIVAC stands for Universal Automatic Computer.
• J. Presper Eckert and
John Mauchly invented it.
• It depleted the idea of using
punch cards as input.
Features:
• It contained almost 5,000 vacuum tubes.
• The power consumption was 125KW.
• 30 minutes were required to on it.