Architecture (562409), страница 22
Текст из файла (страница 22)
In addition to proprietary systems, open, or portable, operating systems have been developed to run computers built by other manufacturers. Open operating systems rose to prominence during the 1980s and are now widely used to run personal computers (PCs) and workstations, which use extremely powerful PCs. The dominant operating system is the disk operating system (DOS) developed by Microsoft Corporation. Also popular is Microsoft's Windows NT, an adjunct to DOS that provides enhanced computer graphics.
Besides mainframe and PC-type operating systems, network operating systems have been developed that allow PCs and workstations to share peripheral devices and communicate with a mainframe computer or a server (i.e., a device that stores information and assists in the operation of a network of computers). Network operating systems usually act as an additional layer above a primary operating system, such as DOS. Dominant in this category are Novell Inc.'s UNIX, an operating system designed for networked workstations, and Novell's Netware, which is the leading network operating system.
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