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A laptop, often called a notebook computer or just notebook, is a small, portable personal computer with a "clamshell" form factor, having, typically, a thin LCD or LED computer screen mounted on the inside of the upper lid of the "clamshell" and an alphanumeric keyboard on the inside of the lower lid. Laptops are folded shut for transportation, and thus are suitable for mobile use.
Its name comes from "lap", as it was deemed to be placed for use on a person's lap.
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.
Despite these setbacks, the laptop computer market continues to expand, introducing a number of laptops like Acer's Aspire and Travel Mate, Asus' Transformer Book, Vivo Book and Zenbook, Dell's Inspiron, Latitude and XPS, HP's Elite Book, Envy, Pavilion and Pro Book, Lenovo's Idea Pad and Think Pad and Toshiba's Portégé, Satellite and Tecra that incorporate the use of laptop computers.
The form of the traditional laptop computer is a clamshell, with a screen on one of its inner sides and a keyboard on the opposite, facing the screen.
Hardware specifications, such as the processor speed and memory capacity, significantly vary between different types, makes, models and price points.
Design elements, form factor and construction can also vary significantly between models depending on intended use.
Examples of specialized models of laptops include rugged notebooks for use in construction or military applications, as well as low production cost laptops such as those from the One Laptop per Child (OLPC) organization, which incorporate features like solar charging and semi-flexible components not found on most laptop computers.
It was based on an Intel 8085 processor, 8-bit, clocked at 2 MHZ.
It was equipped with a central 64K bite Ram, a keyboard with 58 alpha numeric keys and 11 numeric keys ( separate blocks ), a 32-character screen, a floppy disk : capacity = 140 000 characters, of a thermal printer : speed = 28 characters / second, an asynchronous channel, a synchronous channel, a 220V power supply. It had no battery, a 5 in (13 cm) cathode ray tube (CRT) screen, and dual 5.25 in (13.3 cm) single-density floppy drives.