The document discusses the six generations of computers from the 1st generation in 1945-1955 to the 6th generation in the future. The 1st generation used vacuum tubes and magnetic drums. The 2nd generation from 1955-1965 used transistors. The 3rd generation from 1965-1975 used integrated circuits. The 4th generation from 1975-1989 used VLSI circuits. The 5th generation from 1989 to present uses ULSI technology. Each generation became smaller, faster, more reliable, efficient and affordable due to technological advancements in circuitry.

1. SHABNAM
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2.  1st Generation :1945-1955
 2nd Generation :1955-1965
 3rd Generation :1965-1975
 4th Generation : 1975-1989
 5th Generation : 1989- Present
 6th Generation : Future

3.  During 1940-1956.
 Used vacuum tubes for
circuitry.
 Magnetic drums for memory.
 Vacuum tube developed by
Lee De Forest.
 Space utilised for first
generation is the entire
room.
 Vacuum tube is used for
amplify a signal by
controlling the moment of
electrons.

4.  Colossus was the world's
first programmable
electronic digital
computer.
 This computer
was developed by British
code breakers in 1943–
1945 to help in the crypt
analysis of the Lorenz
cipher.
 Colossus used thermionic
valves to perform Boolean
and counting operations.

5.  First fully electronic
digital computer built
in the U.S
 Created at the
university of
Pennsylvania.
 This weighs 30 tons
and contains 18,000
vacuums.
 This costs $4,87,000.

6.  First generation computers were based on
vacuum tubes.
 The OS of first generation computers were
very slow.
 They were large in size.
 Production of heat was in large amount in
first generation computer.
 First generation computers were unreliable.
 They were difficult to execute and use.

7.  During 1950-1960.
 Used transistors .
 Had many components of
the modern day
computer.
 2nd generation computers
had a printer , operating
system, stored programs,
as well as some sort of
memory.

8.  Second generation computer machines were
based on the transistor technology.
 Second generation computer were smaller as
compared to the first generation.
 The computational time was reduced .
 These computers are more reliable and less
prone to hardware failure .
 These were portable and generated less
amount of heat.

9.  Period1965-1971.
 Used integrated
circuits .
 A single IC has many
transistors, resistors,
and capacitors along
with the associated
circuitry.
 The IC was invented
by Jack Kilby .

10.  Third generation computers are small
compared to second generation computers.
 These computers are cheaper .
 More reliable and easily portable.
 More efficient than second generation
computers.
 These computers are fast.
 High level programming languages are used .

11.  During 1971-1989.
 Used Very Large Scale
Integrated (VLSI) circuits.
 VLSI circuits having
about 5000 transistors
and other circuit
elements with their
associated circuits on a
single chip made it
possible to have
microcomputers
of fourth generation.

12.  Used VLSI technology.
 Very cheap.
 Portable and reliable.
 Use of PC’s.
 Very small size.
 Concept of internet was introduced.
 Computers became easily available.
 Great development in fields of network.

13.  During 1990-present.
 Used ULSI technology
resulting in the
production of
microprocessor
having 10 million
electronic
components.
 All the higher level
languges are used
such as C, C++,
Java,.Net etc.

14.  Less power consumption.
 High performance and low cost.
 Computers based on artificial intelligence are
used .
 Portable note book computers were
introduced.
 Development of expert systems to make
decissions in real life situations.

15.  Future
generations........