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expanded memory specification (EMS)

Expanded Memory Specification (EMS) is an add-on system for DOS operating systems that can be used to manage main memory with storage capacities of 1 megabyte (MB) and more.

Memory

areas of a main memory

areas of a main memory

EMS works with a memory address area reserved under the DOS operating system, which is divided into 16-KB sections, called pages. For EMS, at least 4 consecutive pages, corresponding to 64 kilobytes (KB), of DOS memory between 640 KB and 1 MB are used. Typically, the address range is between 768 KB and 896 KB. This 64 KB range can be mapped and is known as the Expanded Memory Page Frame. Using a management program, this area can be managed. The EMS area is only supported by programs that take this area into account, for example Lotus 123 and WordPerfect 5.x.

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Englisch: expanded memory specification - EMS
Updated at: 02.07.2011
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