Continuing on down to smaller and smaller systems, we come to palmtop computers and embedded systems. A palmtop computer or PDA (Personal Digital Assistant) is a small computer that fits in a shirt pocket and performs a small number of functions such as an electronic address book and memo pad. Embedded systems run on the computers that control devices that are not generally thought of as computers, such as TV sets, microwave ovens, and mobile telephones. These often have some characteristics of real-time systems but also have size, memory, and power restrictions that make them special. Examples of such operating systems are PalmOS and Windows CE (Consumer Electronics).
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