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Extended memory refers to memory on an x86 platform PC above 1 Megabyte of memory.

In the Intel personal computer world, the original CPU was only able to directly address up to 640K of memory. This was called conventional memory. Above that, up to 1 megabytes, was called expanded memory. Accessing the expanded memory required additional instruction to allow for bank switching. You used special hardware to "rename" sections (banks) of the expanded memory to something in the conventional range so that it could be accessed as if it were conventional memory.

Extended memory is memory greater than 1 megabyte for later intel compatible x86 processors that could support it. Extended memory was accessed using standardized API functions that allow moving data to and from the memory area and management it.

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