Generation of Computer

 

How Computers Evolved?

Computers in the form of personal desktop computers, laptops and tablets have become such an important part of everyday living that it can be difficult to remember a time when they did not exist.

In reality, computers as they are known and used today are still relatively new. Although computers have technically been in use since the abacus approximately 5000 years ago, it is modern computers that have had the greatest and most profound effect on society.

The first full-sized digital computer in history was developed in 1944. Called the Mark I, this computer was used only for calculations and weighed five tons. Despite its size and limited ability it was the first of many that would start off generations of computer development and growth.

Generations of Computers?

First Generation Computers: VACUUM TUBES (1940 - 1956)

a.       The first computer systems used vacuum tubes for circuitry and magnetic drums for memory and were often enormous, taking up entire rooms.

b.       These computers were very expensive to operate and in addition to using a great deal of electricity, the first computers generated a lot of heat, which was often the cause of malfunctions.

c.       First generation computers relied on machine language the lowest-level programming languages understood by computers, to perform operations, and they could only solve one problem at a time.

d.       It would take operators days or even weeks to set-up a new problem. Input was based on punched cards and paper tape, and output was displayed on printouts.

e.       The UNIVAC and ENIAC computers are examples of first-generation computing devices. The UNIVAC was the first commercial computer delivered to a business client, the U.S. Census Bureau in 1951.

Second Generation Computers: TRANSISTORS (1956 - 1963)

a.       The world would see transistors replace vacuum tubes in the second generation of computers. The transistor was invented at Bell Labs in 1947 but did not see widespread use in computers until the late 1950s.

b.       The transistor was far superior to the vacuum tube, allowing computers to become smaller, faster, cheaper, more energy-efficient, and more reliable than their first-generation predecessors.

c.       Though the transistor still generated a great deal of heat that subjected the computer to damage, it was a vast improvement over the vacuum tube. Second-generation computers still relied on punched cards for input and printouts for output.

d.       Second-generation computers moved from cryptic binary machine language to symbolic, or assembly, which allowed programmers to specify instructions in words.

e.       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, which moved from a magnetic drum to magnetic core technology.

f.        The first computers of this generation were developed for the atomic energy industry.

Third Generation Computers: INTEGRATED CIRCUITS (1964 - 1971)

a.       The development of the integrated circuit was the hallmark of the third generation of computers.

b.       Transistors were miniaturized and placed on silicon chips, called semiconductors, which drastically increased the speed and efficiency of computers.

c.       Instead of punched cards and printouts, users interacted with third generation computers through keyboards and monitors and interfaced with an operating system, which allowed the device to run many different applications at one time with a central program that monitored the memory.

d.       Computers for the first time became accessible to a mass audience because they were smaller and cheaper than their predecessors.

Fourth Generation Computers: MICROPROCESSORS (1970 - PRESENT)

a.       The microprocessors ushered in the fourth generation of computers, as thousands of integrated circuits were built onto a single silicon chip. What in the first generation filled an entire room could now fit in the palm of the hand.

b.       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.

c.       In 1981, IBM introduced its first computer for the home user, and in 1984 Apple introduced the Macintosh. Microprocessors also moved out of the realm of desktop computers and into many areas of life as more and more everyday products began to use microprocessors.

d.       As these small computers became more powerful, they could be linked together to form networks, which eventually led to the development of the Internet.

e.       Fourth generation computers also saw the development of GUIs, the mouse and handheld devices.

Fifth Generation Computers: ARTIFICIAL INTELLIGENCE (PRESENT - BEYOND)

a.       Fifth generation computing devices, based on artificial intelligence, are still in development, though there are some applications, such as voice recognition, that are being used today.

b.       The use of parallel processing and superconductors is helping to make artificial intelligence a reality.

c.       Quantum computation and molecular and nanotechnology will radically change the face of computers in years to come.

d.       The goal of fifth-generation computing is to develop devices that respond to natural language input and are capable of learning and self-organization.