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extended memory
Last modified: Sunday, September 01, 1996 

Memory above and beyond the standard 1MB (megabyte) of main memory that DOS supports. Extended memory is only available in PCs with an Intel 80286 or later microprocessor.

Two types of memory can be added to a PC to increase memory beyond 1MB: expanded memory and extended memory. Expanded memory conforms to a published standard called EMS that enables DOS programs to take advantage of it. Extended memory, on the other hand, is not configured in any special manner and is therefore unavailable to most DOS programs. However, MS-Windows and OS/2 can use extended memory.

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For internet.com pages about extended memory . Also check out the following links!

Related Links

DOS Protected Mode Interface (DPMI)
This is a programmer's reference copy of the DOS Protected Mode Interface, a protected mode API specification for DOS extended applications.

Overview of memory management
This page, from Qualitas Inc., provides a detailed explanation of the 8088 CPU, low/high DOS, expanded and extended memory, and 386 capabilities.

related categories

DOS

Memory

related terms

conventional memory

DOS Protected Mode Interface (DPMI)

expanded memory

high memory area

himem.sys

low memory

protected mode

RAM disk

VCPI

XMS


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