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| extended industry-standard architectureextended memory ： FOLDOC |
extended memory
Memory above the first megabyte of address space in an IBM PC with an 80286 or later processor.
Extended memory is not directly available in real mode, only through EMS, UMB, XMS, or HMA; only applications executing in protected mode can use extended memory directly. In this case, the extended memory is provided by a supervising protected mode operating system such as Microsoft Windows. The processor makes this memory available through a system of {global descriptor tables} and {local descriptor tables}. The memory is "protected" in the sense that memory assigned a local descriptor cannot be accessed by another program without causing a hardware trap. This prevents programs running in protected mode from interfering with each other's memory.
A protected mode operating system such as Windows can also run real-mode programs and provide expanded memory to them. DOS Protec
to them. DOS Protec
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