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EMS (Expanded Memory Specification) - Definition

EMS is an abbreviation for Expanded Memory Specification. It is also sometimes referred to the LIM specification because it was developed by Lotus, Intel, and Microsoft. It provides a way for computers running under DOS to access the additional 384 KB of memory, between 640K and 1024K, normally dedicated to communication with peripherals, for program memory. EMS memory management provides access to a maximum of 32M of expanded memory through a small (usually 64K) window in conventional memory. EMS is actually a scheme designed primarily for pre 286 systems that could not access extended memory. It is a specification for the use of Expanded Memory enabled by HIMEM.SYS and EMM386.EXE.

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