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EMM (Expanded Memory Manager) - Definition

EMM is an abbreviation for Expanded Memory Manager. It is a device driver that provides a software interface to expanded memory. EMMs were originally created for expanded memory boards, but can also use the memory management capabilities of the 386 or higher processors to emulate an expanded memory board. EMM386.EXE is an example of an EMM that comes with DOS. A memory manager, such as HIMEM.SYS or EMM386.EXE, is necessary in order to used Expanded Memory (special memory that lies outside of the CPU's normal address space). EMM divides expanded memory into 16 KB units called pages, plus 64KB of unused Upper Memory for EMS (Expanded Memory Specification) page frames.

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