What is the History and different generations of Computer?
History of Computer:
Calculating Machines:
ABACUS was the first mechanical calculating device for counting of large numbers.
The word ABACUS means calculating board.
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History of Computer Abacus |
It consists of bars in horizontal positions on which sets of beads are inserted.
The horizontal bars have 10 beads each, representing units, tens, hundreds, etc.
Napier’s bones:
This was a mechanical device built for the purpose of multiplication in 1617 by an English mathematician John Napier.
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History of Computer Napiers Bones |
Slide Rule:
This was developed by an English mathematician Edmund Gunter in the 16th century. Using the slide rule, one could perform operations like addition, subtraction, multiplication and division. It was used extensively till late 1970s.
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| History of Computer Slide Rule |
Pascal’s Adding and Subtraction Machine:
This was developed by Blaise Pascal. It could add and subtract. The machine consisted of wheels, gears and cylinders.
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History of Computer Blaise Pascal Adding and Subtracting Machine |
Leibniz’s Multiplication and Dividing Machine:
This was a mechanical device that could both multiply and divide.
The German philosopher and mathematician Gottfried Leibniz built it around 1673.
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| History of Computer Leibniz Multiplication and Dividing Machine |
Punch Card System:
This was developed by Jacquard to control the power loom in 1801.
He invented the punched card reader that could recognize the presence of hole in the punched card as binary one and the absence of the hole as binary zero.
The 0s and 1s are the basis foundation of the modern digital computer.
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| History of Computer Punch Card System |
Babbage’s Analytical Engine:
An English man Charles Babbage built a mechanical machine to do complex mathematical calculations, in the year 1823. The machine was called as difference engine.
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| History of Computer Charles Babbage Analytical Engine |
Later, Charles Babbage and Lady Ada Lovelace developed a general-purpose calculating machine, the analytical engine.
Charles Babbage is also called the father of computer.
Hollerith’s Punched Card Tabulating Machine:
This was invented by Herman Hollerith. The machine could read the information from a punched card and process it electronically.
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Hollereith Punched Card Tabulating Machine |
Different Generations of Computer:
The computer has evolved from a gigantic simple calculating machine to a compact but much more powerful machine capable of complex calculations.
The evolution of computer to the current state is defined in terms of the generations of computer.
Each generation of computer is designed based on a new technological development, resulting in better, cheaper and smaller computers that are more powerful, faster and efficient than their predecessors.
The generations of computer can be ordered as follows:
1. Technology implemented
2. Computing characteristics (processing clock speed)
3. Physical size and appearance
4. Applications
First Generation of Computer:
The time period of first generation of computer was from 1940 to 1956.
Hardware Technology:
The first generation of computers used vacuum tubes for circuitry and magnetic drums for memory.
The input to the computer was through punched cards and paper tapes.
The output was displayed as printouts.
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| First Generation of Computer |
Software Technology:
The instructions were written in machine language.
Machine language uses 0s and 1s for coding of the instructions.
The first generation computers could solve one problem at a time.
Computing Characteristics:
The computation time was in milliseconds.
Physical Appearance:
These computers were enormous in size and required a large room for installation.
Applications:
They were used for scientific applications as they were the fastest computing device of their time.
Example:
Universal Automatic Computer (UNIVAC), Electronic Numerical Integrator And Calculator (ENIAC), and Electronic Discrete Variable Automatic Computer (EDVAC).
The first generation computers used a large number of vacuum tubes and thus generated a lot of heat.
They consumed a great deal of electricity and were expensive to operate.
The machines were prone to frequent malfunctioning and required constant maintenance.
Since first generation computers used machine language, they were difficult to program.
Second Generation of Computer:
The time period of second generation of computer was from 1956 to 1963.
Hardware Technology:
Transistors replaced the vacuum tubes of the first generation of computers.
Transistors allowed computers to become smaller, faster, cheaper, energy efficient and reliable.
The second generation computers used magnetic core technology for primary memory.
They used magnetic tapes and magnetic disks for secondary storage.
The input was still through punched cards and the output using printouts.
They used the concept of a stored program, where instructions were stored in the memory of computer.
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| Second Generation of Computer |
Software Technology:
The instructions were written using the assembly language.
Assembly language uses mnemonics like ADD for addition and SUB for subtraction for coding of the instructions.
It is easier to write instructions in assembly language, as compared to writing instructions in machine language.
High-level programming languages, such as early versions of COBOL and FORTRAN were also developed during this period.
Computing Characteristics:
The computation time was in microseconds.
Physical Appearance:
Transistors are smaller in size compared to vacuum tubes, thus, the size of the computer was also reduced.
Applications:
The cost of commercial production of these computers was very high, though less than the first generation computers.
The transistors had to be assembled manually in second generation computers.
Example: PDP-8, IBM 1401 and CDC 1604 4 Second generation computers generated a lot of heat but much less than the first generation computers.
They required less maintenance than the first generation computers.
Third Generation of Computer:
Hardware Technology:
The third generation computers used the Integrated Circuit (IC) chips.
In an IC chip, multiple transistors are placed on a silicon chip. Silicon is a type of semiconductor.
The use of IC chip increased the speed and the efficiency of computer, manifold.
The keyboard and monitor were used to interact with the third generation computer, instead of the punched card and printouts.
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Third Generation of Computer |
Software Technology:
The keyboard and the monitor were interfaced through the operating system. Operating system allowed different applications to run at the same time.
High-level languages were used extensively for programming, instead of machine language and assembly language.
Computing Characteristics:
The computation time was in nanoseconds.
Physical Appearance:
The size of these computers was quite small compared to the second generation computers.
Applications:
Computers became accessible to mass audience. Computers were produced commercially, and were smaller and cheaper than their predecessors.
Example:
IBM 370, PDP 11 The third generation computers used less power and generated less heat than the second generation computers.
The cost of the computer reduced significantly, as individual components of the computer were not required to be assembled manually.
The maintenance cost of the computers was also less compared to their predecessors.
Fourth Generation of Computer:
Hardware Technology:
They use the Large Scale Integration (LSI) and the Very Large Scale Integration (VLSI) technology.
Thousands of transistors are integrated on a small silicon chip using LSI technology.
VLSI allows hundreds of thousands of components to be integrated in a small chip.
This era is marked by the development of microprocessor.
Microprocessor is a chip containing millions of transistors and components, and, designed using LSI and VLSI technology.
This generation of computers gave rise to Personal Computer (PC).
Semiconductor memory replaced the earlier magnetic core memory, resulting in fast random access to memory.
Secondary storage device like magnetic disks became smaller in physical size and larger in capacity.
The linking of computers is another key development of this era.
The computers were linked to form 5 networks that led to the emergence of the Internet.
This generation also saw the development of pointing devices like mouse, and handheld devices.
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Fourth Generation of Computer |
Software Technology:
Several new operating systems like the MS-DOS and MS Windows developed during this time.
This generation of computers supported Graphical User Interface (GUI).
GUI is a user friendly interface that allows user to interact with the computer via menus and icons.
High-level programming languages are used for the writing of programs.
Computing Characteristics:
The computation time is in picoseconds.
Physical Appearance:
They are smaller than the computers of the previous generation.
Some can even fit into the palm of the hand.
Applications:
They became widely available for commercial purposes.
Personal computers became available to the home user.
Example:
The Intel 4004 chip was the first microprocessor.
The components of the computer like Central Processing Unit (CPU) and memory were located on a single chip.
In 1981, IBM introduced the first computer for home use.
In 1984, Apple introduced the Macintosh.
The microprocessor has resulted in the fourth generation computers being smaller and cheaper than their predecessors.
The fourth generation computers are also portable and more reliable.
They generate much lesser heat and require less maintenance compared to their predecessors.
GUI and pointing devices facilitate easy use and learning on the computer.
Networking has resulted in resource sharing and communication among different computers.
Fifth Generation of Computer:
Based on Artificial Intelligence(A.I):
The goal of fifth generation computing is to develop computers that are capable of learning and self-organization.
The fifth generation computers use Super Large Scale Integrated (SLSI) chips that are able to store millions of components on a single chip.
These computers have large memory requirements.
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Fifth Generation of Computer |
This generation of computers uses parallel processing that allows several instructions to be executed in parallel, instead of serial execution.
Parallel processing results in faster processing speed. The Intel dual-core microprocessor uses parallel processing.
The fifth generation computers are based on Artificial Intelligence (AI).
They try to simulate the human way of thinking and reasoning.
Artificial Intelligence includes areas like Expert System (ES), Natural Language Processing (NLP), speech recognition, voice recognition, robotics, etc.
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