From Wikipedia, the free encyclopedia
A modern laptop computer
A laptop computer is a personal computer for mobile use. A laptop has most of the same components as a desktop computer, including a display, a keyboard, a pointing device such as a touchpad (also known as a trackpad) and/or a pointing stick, and speakers into a singleunit. A laptop is powered by mains electricity via an AC adapter, and can be used away from an outlet using a rechargeable battery. Laptops are also sometimes called notebook computers, notebooks or netbooks.
Portable computers, originally monochrome CRT-based and developed into the modern laptops, were originally considered to be a small niche market, mostly for specialized field applicationssuch as the military, accountants and sales representatives. As portable computers became smaller, lighter, cheaper, more powerful and as screens became larger and of better quality, laptops became very widely used for all sorts of purposes.
Contents [hide] * 1 History * 2 Classification * 2.1 Desktop replacement * 2.2 Subnotebook * 2.3 Netbook * 2.4 Rugged laptop *2.5 Tablet laptop * 3 Components * 3.1 Docking stations * 3.2 Charging stations * 3.3 Standards * 4 Advantages * 5 Disadvantages * 5.1 Performance * 5.2 Upgradeability * 5.3 Ergonomics and health effects * 5.3.1 Wrists * 5.3.2 Neck, spinal * 5.3.3 Possible effect on fertility * 5.3.4 Thighs * 5.4 Durability *5.4.1 Equipment wear * 5.4.2 Parts replacement * 5.4.3 Heating and cooling * 5.4.4 Battery life * 5.5 Security and privacy * 6 Major brands and manufacturers * 7 Sales * 8 Extreme environments * 9 Accessories * 10 Former features * 11 See also * 12 References * 13 External links |
Mainarticle: History of laptops
Alan Kay with "Dynabook" prototype (November 5, 2008 in Mountain View, California)
The Epson HX-20
As the personal computer became feasible in the early 1970s, the idea of a portable personal computer 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 IBMSCAMP project (Special Computer APL Machine Portable), was demonstrated in 1973. This prototype was based on the IBM PALM processor (Put All Logic In Microcode or 128 bit).
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 23.6 pounds (10.7 kg). It had no battery, a 5 in (13 cm) CRT screen, and dual 5.25 in (13.3 cm) single-density floppy drives. In the same year the first laptop-sized portable computer, the Epson HX-20, was announced. The Epson had a LCDscreen, a rechargeable battery, and a calculator-size printer in a 1.6 kg (3.5 lb) 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$19,630 today) GRiD Compass 1100, released in 1982, was used atNASA and by the military among others.The Gavilan SC, released in 1983, was the first computer described as a "laptop" by its manufacturer. 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...