Different types of computer systems

PC

Personal Computers are now a very common item yet in 1995 there were only 250 computers in use throughout the world. More than one million computers had been sold in 1980 and by the mid 1980's this number has risen to 30 million.

Laptop

laptop computer, usually called a notebook computer by manufacturers, is a battery- or AC-powered personal computer generally smaller than a briefcase that can easily be transported and conveniently used in temporary spaces such as on airplanes, in libraries, temporary offices, and at meetings. A laptop typically weighs less than 5 pounds and is 3 inches or less in thickness. Among the best-known makers of laptop computers are IBM, Apple, Compaq, Dell, and Toshiba.

P.D.A

 A personal digital assistant (PDA), also known as a palmtop computer, or personal data assistant, is a mobile device that functions as a personal information manager. Current PDAs often have the ability to connect to the Internet. A PDA has an electronic visual display, enabling it to include a web browser, but some newer models also have audio capabilities, enabling them to be used as mobile phones or portable media players.

Games console

A games console is a form of interactive multimedia used for entertainment. The game consists manipulable images genrerated by a video game console and displayed on a television or similar audio-video system. The game itself is usually controlled and manipulated using a handheld device connected to the console called the controller.

Mobile

A mobile phone allows calls into the switched telephone system over a radio link. Early mobile phones were usually bulky and permanently installed in vehicles. They provide limited service because only a few frequencies were available for a geographic area. Modern cell phones or hand phones make use of cellular network concept, were frequencies are re-used repeatedly within a city area, allowing many more users to share access to the radio bandwith. A mobile phone allows calls to be placed over a wide geographic area, generally the user is a subscriber to the phone service and does not own the base station. By contrass, a cordless telephone is used only within the range of a single, private base station.

 

Graphics Tablet- A graphics tablet is a computer input device that enables a user to hand draw, similar to the way a person draws images with a pencil and paper. These tablets may also be used to capture data or handwritten signatures. It can also be used to trace an image from a piece of paper which is taped or otherwise secured to the surface. Capturing data in this way, either by tracing or entering the corners of linear poly-lines or shapes is called digitizing.

 

Embedded devices- An embedded device is commonly used in todays society. A embedded device is a electronic computer that has input, output and process. It sometimes also has storage. Examples are ABS, Washing machines and Mobile phones.