The evolution of computers goes long back ago and its very interesting as well as quite important for understanding the working of computer.

Long back about 4ooB.c first every computing instrument was developed which can add and subtract. graduaklly afterwards there was importance of an computing instrument. pascal first computer came in 1642and other scientist loike napiers and leibnitz done significant work in this field which eventually led to present day computer. MARK-1 was the first modern computer. British mathematician AUGUSTA ADA BYRON was the first ever programmer. BASIC was introduced in 1965. IBM pc was introduced in 1981. First graphical computer “MAC” came in 1984 and microsoft was introduced in 1985. windows 3.1 become most popular in 1992 bthe first general computer was ENIAC( ELECTRONIC NUMERICAL INTEGRATOR AND CALCULATOR). JOHN VON NEUMAN gave the concept of stored program.

COMPUTER GENERATIONS:-

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A Notebook or commonly referred to as a laptop computer is a smaller version of the desktop computer. But its advantages are that all of its components it comes in one neat mobile notebook shaped digital display box, and is easily portable. It usually weighs around 2 to 17 pounds (1 to 8 kgs) depending on the make, materials and different other factors that come into play such as the parent company etc.

Notebooks run on a singular battery from (usually) an external AC/DC adapter. It charges the battery and in the meanwhile supplies power to the laptop too. Numerous `notebooks` have a 3 volt back-up cell to supply power during power failures and when in places where there is no steady power supply. Notebooks, as personal computers are worthy and capable of doing the same work as of desktop computers. But they are less powerful than their desktop counterparts at the same price. This is because of the fact that most parts used in desktop computers are miniaturized to fit into the slim notebook version of the machine.

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