Sunday, August 2, 2009

Portable Computers Laptop, Notebook and Palmtop

Portable computers, once a novelty, are now a part of everyday business life. Portable computers work and act just like larger systems, except they are very compact. This study note will give u a brief description of portable computer types.

Types of Portable Computers:
Portable computers are classified according to size and function. Today there are three basic types of portable computers: laptops, notebooks, and subnotebooks.
Laptop Computers
With advancements in battery technology and the advent of functional, large-screen, liquid crystal displays (LCDs), the first truly portable computers, referred to as laptops, were produced in the late 1980s. These units featured integrated AT-compatible computer boards, including I/O (input/output) and video controller functions. Laptops, as mentioned, usually feature a folding LCD display and a built-in keyboard and pointing device. They also use an external power supply and a removable, rechargeable battery. Today's laptops have fairly large (2 GB or more) hard drives, a CD-ROM drive (or DVD drive), and a floppy disk drive (often the latter two are interchangeable plug-ins).When laptops originally appeared on the market, they were the smallest portable computers made. Today, they are high-end machines that offer features and performance comparable to a desktop system.
Notebook Computers
Advances in integrated circuit (IC) technology allowed the size of computer components to be reduced even further, and, in the early to mid-1980s, the notebook computer was born. Notebooks are roughly 8.75 inches deep × 11 inches wide × 2.25 inches thick, and designers are working to decrease the size and power consumption of these units even further. The reduction in size comes at a cost, however, and notebooks typically have smaller and less capable displays and keyboards than laptops. A wide variety of specialty items have appeared on the market designed to overcome some of the notebook's shortcomings. Docking ports are one such item.

Subnotebook (Palmtop) Computers

Even smaller than the notebook computers are subnotebook computers, also known as palmtops or handhelds. These tiny systems are 7 inches wide × 4 inches deep × 1 inch high. Due to their size, they are rather limited in function. Keyboards, for example, are too small to permit touch-typing. With notebooks decreasing in cost and weight, palmtops have been losing market share and popularity

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