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Traditional laptops are the most common form of laptops, although Chromebooks, Ultrabooks, convertibles and 2-in-1s (described below) are becoming more common, with similar performance being achieved in their more portable or affordable forms.
A subnotebook or an ultraportable, is a laptop designed and marketed with an emphasis on portability (small size, low weight, and often longer battery life).
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 part, which is opened up to use the computer.
Laptops are folded shut for transportation, and thus are suitable for mobile use.
Subnotebooks are usually smaller and lighter than standard laptops, weighing between 0.8 and 2 kg (2-5 lb), Since the introduction of netbooks and ultrabooks, the line between subnotebooks and either category has blurred.
A standard laptop combines the components, inputs, outputs, and capabilities of a desktop computer, including the display screen, small speakers, a keyboard, hard disk drive, optical disc drive pointing devices (such as a touchpad or trackpad), a processor, and memory into a single unit.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.It weighed 12 kg and its dimensions were 45cm x 45cm x 15cm. Both Tandy/Radio Shack and Hewlett Packard (HP) also produced portable computers of varying designs during this period.Except where there is a distinct legal trademark around a term (notably Ultrabook), there are rarely hard distinctions between these classes and their usage has varied over time and between different sources.
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.There is some question as to the original etymology and specificity of either term—the term laptop appears to have been coined in the early 1980s to describe a mobile computer which could be used on one's lap, and to distinguish these devices from earlier, much heavier, portable computers (informally called "luggables").