Portable computers are classified according to size and function. Today there are three basic types of portable computers: laptops, notebooks, and subnotebooks.
The first "portable" computers were often called "luggables." The size of a portable sewing machine, they tipped the scales at 30 pounds. Equipped with a small CRT (cathode-ray tube) display, they were actually a traditional PC in a slightly smaller case.
The real change in portable computers came with the advent of the flat-panel display, allowing the portable to take on the now-familiar slim design. Laptop is the term used for the heavier version, usually offering most of the features of a full-fledged PC but with a folding flat-panel display and integrated keyboard. Notebooks are slender devices that often lack the full range of storage as part of the normal configuration. PDAs, a special group of products offering a subset of features including e-mail, schedule tracking, contact records, and limited note taking and Web browsing, are beyond the scope of this chapter.
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