FIVE GENERATIONS OF COMPUTERS

2. COMPUTER GENERATION
 Computer has become a part of our life. Today along with calculations, their
work area is very wide-supermarket scanner scan and calculate our
grocery bill and also keep store inventory, automatic teller machines (ATM)
help us in banking transaction.
 How the technology has developed and what its future course is . To
understand this first we should know about the different generation of
computers.

3. First generation computers

4. First generation computers
(1940-1956)
 The first computers used vacuum tubes for circuitry
and magnetic drums for memory.
 They were often enormous and taking up entire room.
 First generation computers relied on machine
language.
 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.
 The UNIVAC and ENIAC computers are examples of
first-generation computing devices.

5. FIRST-GENERATION COMPUTER
(1945-1956)
First-generation computers used vacuum tubes and values as their basic electronic
component. They were extremely large in size and reliable. The language used for
storing and processing data was machine language.
Some of the first-generation computers are:
1.) ENIAC (electronic numerical integrator and calculator) – it was built in
1946 at the university of PENNSYLVANIA , USA by JOHN ECKERT and JOHN
MAUCHLY.
2.) EDVAC (electronic discrete variable automatic computer) – developed in 1950
3.) EDSAC (electronic delay storage automatic computer) – it was developed by MV
WILIKES at Cambridge University in 1949
4.) Univac-I - The Universal Automatic Computer was USA’S first commercially
available computer system. It was delivered in 1951 by the ECKERT-MAUCHLY
computer corp.

6. DISADVANTAGES :-
a.) They were too bulky.
b.) They emitted large amounts of heat because they
used lots of vacuum tubes .
c.) AIR conditioning was required.
d.) They were prone to frequent failure that’s why they
were unreliable.
e.) They were not portable.

7. Second generation computers

8. Second generation computers
(1956-1963)
• Transistors replaced vacuum tubes and ushered in the
second generation of computers.
• Second-generation computers moved from
cryptic binary machine language to symbolic.
• High-level programming languages were also being
developed at this time, such as early versions
of COBOL and FORTRAN.
• These were also the first computers that stored their
instructions in their memory.

9. SECOND-GENERATION COMPUTERS
(1956-1963)
In the generation of computers, transistors were used in place of vacuum tubes.
Transistors are more compact than vacuum tubes as they are made up of
semiconductors. They are also more durable than vacuum tubes. Programming
languages some of the computers of the second generation are:
IBM 1620 –
Its size was used smaller as compared to the first-generation computers and it was used
mostly for scientific purpose.
IBM 1401-
IT was used for was business application.
CDC 3600-
IT was used for scientific purpose.

10. ADVANTAGES:-
 They were smaller as compared to first-generation computers.
 They generated less heat.
 They took comparatively less computers time.
 They were less prone to failure.
DISADVANTAGES:-
 They required Air Conditioning.
 Frequent maintenance was required.
 They were difficult and quite expensive

11. Third generation computers

12. THIRD GENERATION COMPUTER
(1964 – 1971)
In the third generation of computers integrated circuits (ICs) began to be used. These
ICs were called chips.
These ICs are more compact than a transistor. Single ICs has many transistors,
registers and capacitors, placed on a single thin of silicon. So the computer built of
such components became smaller.
HIGHT-LEVEL language such as BASIC (Beginners all-purpose symbolic instruction code)
were developed during this period.
Some of the computers developed during this period were :
 IBM- 360- Developed by IBM in 1964.
 PDP – 8 -Developed by DEC in 1965.
 PDP- 11 - Developed by DEC IN 1970.
 CRA 1 - Developed by CRAY research in 1974.
 VAX - Developed by DEC 1978.

13. ADVANTAGES:-
1.) They were smaller in size as compared to the second-
generation computers.
2. ) They generated less heat.
3. ) They reduced computational time.
4. ) They involved low maintenance cost.
5. ) They were easily portable.
6. ) They were comparatively cheaper.

14. Fourth generation computers

15. Fourth generation computers
(1971-present)
 The microprocessor brought the fourth generation of
computers, as thousands of integrated circuits were
built onto a single silicon chip.
 The Intel 4004 chip, developed in 1971, located all the
components of the computer.
 From the central processing unit and memory to
input/output controls—on a single chip.
 Fourth generation computers also saw the
development of GUIs, the mouse and
handheld devices.

16. Fourth-generation computers used very large integration
(VLSI) technology. After the induction of integrated circuits,
computers could only get small in size, since hundreds of
computers could fit onto one chip. By the 1890s, the use of
VLSI technology had squeezed hundreds of thousands of
computers onto a single chip. Ultra-large scale integration
(ULSI) increased that number to millions. This also helped
decrease the price of computers are IBM-PC, Apple
Macintosh, sun SPARC station etc.
FOURTH GENERATION COMPUTER
(1971 ONWARDS)

17. ADVANTAGES:-
 They were cheaper.
 They had a larger memory and high functional speed.
 They consumed less power.
 They generated a negligible amount of heat.
DISADVANTAGES:-
 Highly sophisticated technology required for the manufacture of
LSI chips.

18. Fifth generation computers

19. Fifth generation computers
(present and beyond)
 Fifth generation computing devices, based on artificial
intelligence.
 Are still in development, though there are some
applications, such as voice recognition.
 The use of parallel processing and superconductors is
helping to make artificial intelligence a reality.
 The goal of fifth-generation computing is to develop
devices that respond to natural language input and are
capable of learning and self-organization.

20.  Is classified as fourth generation computers.
 Faster, more powerful, tremendous data storage and processing
capacity
Computers became more affordable
 Computers can now be found in homes, schools, offices etc.
 There has been a tremendous improvement in software
technology
 Different software applications to choose from: word
processing, spreadsheets, database management, games
and entertainment.
 Computer subjects are now being offered not just to college
students but even to high school and elementary.
 Computers are now used as an aid in teaching math, science etc.
TODAY’S COMPUTER

21. PRESENTED BY:-
SHANTANU TYAGI
14/IMB/28