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Laptop

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What is Laptop?

A laptop computer is a computer that integrated all the elements that need the run properly, including a battery power supply, a screen and a keyboard, in a small casing.

A laptop, often called a notebook or "notebook computer", is a small, portable personal computer with a "clamshell" form factor, an alphanumeric keyboard on the lower part of the "clamshell" and a thin LCD or LED computer screen on the upper portion, which is opened up to use the computer. Laptops are folded shut for transportation, and thus are suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, as of 2014, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, Internet surfing using sites such as YouTube and for personal multimedia and home computer use.

 

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History of Laptop:-

As the personal computer (PC) became feasible in 1971, the idea of a portable personal computer soon followed. A "personal, portable information manipulator" was imagined by Alan Kay at Xerox PARC in 1968, and described in his 1972 paper as the "Dynabook". The IBM Special Computer APL Machine Portable was demonstrated in 1973. This prototype was based on the IBM PALM processor. The IBM 5100, the first commercially available portable computer, appeared in September 1975, and was based on the SCAMP prototype.

As 8-bit CPU machines became widely accepted, the number of portables increased rapidly. The Osborne 1, released in 1981, used the Zilog Z80 and weighed 10.7 kg. It had no battery, a 5 in CRT screen, and dual 5.25 in single-density floppy drives. In the same year the first laptop-sized portable computer, the Epson HX-20, was announced. The Epson had an LCD screen, a rechargeable battery, and a calculator-size printer in a 1.6 kg chassis. Both Tandy/RadioShack and HP also produced portable computers of varying designs during this period. The first laptops using the flip form factor appeared in the early 1980s. The Dulmont Magnum was released in Australia in 1981–82, but was not marketed internationally until 1984–85. The US$8,150 (US$20,230 today) Grid Compass 1101, released in 1982, was used at NASA and by the military, among others. The Sharp PC-5000, Ampere and Gavilan SC released in 1983. The Gavilan SC was the first computer described as a "laptop" by its manufacturer, while the Ampere had a modern clamshell design.

From 1983 onward, several new input techniques were developed and included in laptops, including the touchpad (Gavilan SC, 1983), the pointing stick (IBM ThinkPad 700, 1992), and handwriting recognition (Linus Write-Top, 1987). Some CPUs, such as the 1990 Intel i386SL, were designed to use minimum power to increase battery life of portable computers and were supported by dynamic power management features such as Intel Speed Step and AMD Power Now in some designs.

Displays reached 640x480 (VGA) resolution by 1988 (Compaq SLT/286), and colour screens started becoming a common upgrade in 1991, with increases in resolution and screen size occurring frequently until the introduction of 17" screen laptops in 2003. Hard drives started to be used in portables, encouraged by the introduction of 3.5" drives in the late 1980s, and became common in laptops starting with the introduction of 2.5" and smaller drives around 1990; capacities have typically lagged behind physically larger desktop drives. Optical storage, read-only CD-ROM followed by writeable CD and later read-only or writeable DVD and Blu-ray players, became common in laptops early in the 2000s.

 

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Side effects of Laptop on human health:-

1. There have been cases of 'toasted skin syndrome' in people who used laptops resting on their legs for long periods. Some claim that such damage could potentially lead to skin cancer, but there is no evidence to prove this.

2. One should be aware of the possibility of eye strain, back problems, etc. from sitting in front of the screen for long periods.

3. It will not cause pregnancy harm to the baby as a result of radiation exposure.

 

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