History and Types of Computers

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The history of electronic computers is divided into five generations.

We consider first generation of computer by 1946, when binary system was used and concept of pre-stored instructions as programs were introduced. This generation continued till 1959. In 1946 ENIAC (Electronic Numerical integrator And Calculator) was developed as a result of military need. It was too large to be kept as it took up all space in a 20x40 square feet room and used 19000 vacuum tubes, 70,000 resistors and 500,000 solder connections. It could perform 5,000 additions in a second. It is said that the lights of nearby areas was dimmed when ENIAC was turned on because of its high power consumption.

In 1944 a British man John Von Newman developed EVAC (Electronic Discrete variable Automatic Computer). In 1951 UNIVAC (Universal Automatic Computer) was developed. In 1955 IBM emphasized business problems and developed a vacuum tube computer called IBM-650.

The major invention of this period was vacuum tubes. In this generations Punch Card were used as data storage medium. These computers were operated by a language called machine language.

In the end Assembly language was developed and reduced the work o

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