Four Kinds of Computers
Computers are electronic devices that can follow instructions to accept input, process that input, and produce information. There are four types of computers: microcomputers, minicomputers, mainframe computers, and supercomputers.
Microcomputers, also known as personal computers, are small computers that can fit on a desktop.
Portable microcomputers can fit in a briefcase or even in the palm of your hand. Microcomputers are used in homes, schools, and industry. Today nearly every field uses microcomputers.
One type of microcomputer that is rapidly growing in popularity is the portable computer,which can be easily carried around. There are four categories of portable computers.
Laptops: laptops, which weigh between 10 and 16 pounds, may be AC-powered, battery-powered,or both. The AC-powered laptop weighs 12 to 16 pounds. The battery-powered laptop weighs 10 to 15 pounds, batteries included, and can be carried on a shoulder strap. Notebook PCs: notebook personal computers weigh between 5 and 10 pounds and can fit into most briefcases. It is especially valuable in locations where electrical connections are not available. Notebook computers are the most popular portable computers today.
Subnotebooks: subnotebooks are for frequent flyers and life-on-the-road types.
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