
In DOS memory management, extended memory refers to memory above the first megabyte (220 bytes) of address space in an IBM PC or compatible with an 80286 or later processor. The term is mainly used under the DOS and Windows operating systems. DOS programs, running in real mode or virtual x86 mode, cannot directly access this memory, but are able t...
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http://en.wikipedia.org/wiki/Extended_memory

System RAM above 1MB.
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http://www.encyclo.co.uk/local/20581

Memory (RAM) beyond 1 megabyte (MB) in 80286, 80386, and later computers. Most software that can use it, such as the MS Windows operating system, requires that extended memory be under the control of an XMM. MS Windows uses extended memory to manage and run applications. Extended memory typically is not available to non-Windows applications or MS D …
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