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COMPUTER
LECTURE 02
OUTLINE
 History of Computers
 Computer Generations
History of Computer
ABACUS :
The first calculating device ABACUS was invented in Egypt
The abacus is still in use in some countries especially China, Japan
Operations
o Addition
o Subtraction
o Division
o Multiplication
ABACUS
NAPIER'S, BONES
 Another calculating device developed in 1614 by a scientist, whose name was John, Napier.
 This device calls Napier's bones because it consists of rods made up of bones and could easily
use for multiplication and division.
PASCALINE
 The Pascaline was designed and built by the French mathematician-philosopher Blaise Pascal
between 1642 and 1644.
 First Mechanical calculator
 It could only do addition and subtraction.
PASCALINE
PUNCHED CARD
 1890: Herman Hollerith
o American Inventor
 Developed devices that were able to read information which had been punched
into cards automatically
 Developed a machine called census machine
o Capable of reading the numbers, characters and special symbols
PUNCHED CARD
ENIAC
 First general purpose electronic computer
 ENIAC (Electronic Numerical Integrator and Computer)
 Developed during World War II
 ENIAC filled an entire room and weighed about 30 tons
 Capable of performing arithmetic operations, square roots, and other calculations.
ENIAC
COMPUTERS GENERATION
COMPUTERS GENERATION
5 Generations of Computers
Generations Time Period Technology Used
1st 1940s – 1950s Vaccum Tube based
2nd 1950s – 1960s Transistor based
3rd 1960s – 1970s Integrated Circuit based
4th 1970s – Present Microprocessor based
5th Present – Future Artificial Intelligence based
COMPUTERS GENERATION
 https://www.careerpower.in/school/computer/generation-of-computer

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Computer Lecture #2 |History of Computer

  • 2. OUTLINE  History of Computers  Computer Generations
  • 3. History of Computer ABACUS : The first calculating device ABACUS was invented in Egypt The abacus is still in use in some countries especially China, Japan Operations o Addition o Subtraction o Division o Multiplication
  • 5. NAPIER'S, BONES  Another calculating device developed in 1614 by a scientist, whose name was John, Napier.  This device calls Napier's bones because it consists of rods made up of bones and could easily use for multiplication and division.
  • 6. PASCALINE  The Pascaline was designed and built by the French mathematician-philosopher Blaise Pascal between 1642 and 1644.  First Mechanical calculator  It could only do addition and subtraction.
  • 8. PUNCHED CARD  1890: Herman Hollerith o American Inventor  Developed devices that were able to read information which had been punched into cards automatically  Developed a machine called census machine o Capable of reading the numbers, characters and special symbols
  • 10. ENIAC  First general purpose electronic computer  ENIAC (Electronic Numerical Integrator and Computer)  Developed during World War II  ENIAC filled an entire room and weighed about 30 tons  Capable of performing arithmetic operations, square roots, and other calculations.
  • 11. ENIAC
  • 13. COMPUTERS GENERATION 5 Generations of Computers Generations Time Period Technology Used 1st 1940s – 1950s Vaccum Tube based 2nd 1950s – 1960s Transistor based 3rd 1960s – 1970s Integrated Circuit based 4th 1970s – Present Microprocessor based 5th Present – Future Artificial Intelligence based