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x86 memory segmentation refers to the implementation of memory segmentation on the x86 architecture.
Certain portions of the memory may be addressed by a single index register without changing a 16-bit segment selector.
In real mode or V86 mode, a segment is always 65, 536 bytes in size ( using 16-bit offsets ).
In protected mode, a segment can have variable length.
Segments can overlap.
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