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History of Computer



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Computer History

As we all knows that in earlier days (before 1990s) computers are very costly. It means that any normal individual was not able to purchase the computer at that time.

But in recent years, any normal people such students, school teacher, college professors, doctors etc are able to afford laptops or computers with new and advanced technology.

Computer Generation

Computers are divided into total of 5 generations listed below:

  1. First generation computer
  2. Second generation computer
  3. Third generation computer
  4. Fourth generation computer
  5. Fifth generation computer

Generation of computer was changing due to arrival of new technology.

Now let's briefly describe about all the above listed generations of computer one by one.

First Generation Computers (1942 to 1955)

The beginning of commercial computer age is from UNIVAC (Universal automatic computer). It was developed by two scientists Mauchly and Echert at the Census Department of United States in 1947.

The first generation computers were used during 1942 to 1955. They were based on vacuum tubes.

The first computer machine named UNIVAC-1 was launched in 1951. This computer machine used magnetic medium for input/output of data.

This computer worked successfully till the year 1963.

The technology used for those computers was valve Technology.

The main limitation of this technology was heavy power consumption and not very high reliability.

Examples of first generation computers are ENIVAC and UNIVAC-1.

Advantages of first generation computers

Here are the list of some advantages of using first generation computer at that time:

Disadvantages of first generation computers

Here are the list of some disadvantages of using the first generation computers at that time:

Second Generation Computer (1955 to 1964)

A new technology came into existence and therefore a new generation of computer that is second generation computer also came into existence.

The name of the technology was transistor Technology.

The second generation computers used transistors.

The scientists at Bell Laboratories developed transistor in 1947. These scientists include John barden, William Brattain and William Shockley.

The size of the computers was decreased by replacing vacuum tubes with transistors.

Computers made on transistor Technology were:

In compare to first generation computer.

At that time, the computer named IBM-1401 was the most popular.

This generation of computer, that is second generation computer was in the existence from 1956 to 1963.

The examples of second generation computers are IBM 7094 series, IBM 1400 series and CDC 164 etc.

Advantages of second generation computers

Here are some of the main advantages of using second generation computer at that time:

Disadvantages of second generation computers

And here are some of the main disadvantages of using second generation computers at that time:

Third Generation Computer (1964 to 1975)

Now another new technology named integrated circuits that is ICs came into existence and therefore the third generation computer was also came into existence.

The third generation computers used the integrated circuits (ICs).

Jack kilby developed the concept of integrated circuits in 1958. It was an important invention in the computer field.

The first IC was invented and used in 1961. The size of an IC is about 1/4 square inch. a single IC chip main contain thousands of transistors.

The computer became smaller in size, faster, more reliable and less expensive.

Benefits of using all those computers that was made up on the third generation over second generation:

Those computers used more versatile programs like real time OS that is operating system, multiprogramming techniques and database management.

At that time, IBM-370 was the most popular machine among all at that generation.

Examples of third generation computers are IBM 370, IBM system/360, UNIVAC 1108 and UNIVAC AC 9000 etc.

Advantages of third generation computers

Following are some main advantages of using third generation computers:

Disadvantages of third generation computers

Following are some main disadvantages of using third generation computers:

Fourth Generation Computer (1975 to present)

Fourth generation computer starts from the year, 1971. At that time there was an invention of microprocessor chip that has created a revolution in the computer world.

The fourth generation computers started with the invention of microprocessor. The microprocessor contains thousands of ICs.

Ted Hoff produced the first microprocessor in 1971 for Intel. It was known as Intel 4004. The technology of integrated circuits improved rapidly. The LSI (Large Scale Integration) circuit and VLSI (Very large Scale Integration) circuit was designed. It greatly reduced the size of computer.

The size of modern microprocessors is usually 1 square inch. It can contain millions of electronic circuits.

We are using microprocessor chip from that time (1971) to present or you can says that fourth generation computer are from 1971 to present time.

Examples of fourth generation computers are Apple Macintosh and IBM PC.

Advantages of fourth generation of computers

Following are the advantages of using all those computer machine that are based on fourth generation over previous generation:

Disadvantages of fourth generation computers

Below is the main disadvantages of fourth generation computers:

Fifth Generation Computer (present to beyond)

This generation is in under development.

Scientists are working hard on the fifth generation computers with quick of few breakthroughs. It is based on the technique of artificial intelligence (AI).

All those computer machines that will made on the basis of 5th generation computer will use parallel processing techniques and artificial intelligence. Parallel processing techniques and artificial intelligence are basically similar to the one used by our brain that is human brain. Therefore all those computers that will made on 5th generation techniques are being designed to think as the brain of human beings do.

Computers can understand spoken words and imitate human reasoning. Can respond to its surroundings using different types of sensors.

Scientist are constantly working to increase the processing power of computers. They are trying to create a computer with real IQ with the help of advanced programming and technology.

IBM Watson computer is one example that outsmarts Harvard University students. The advancement in modern Technologies will revolutionize the computer in future.


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