XMS is an abbreviation for eXtended Memory Specification. It is a specification for managing computer memory. As all computer memory locations have a unique address, so that they can be individually accessed, early microprocessors such as the 8086/8088 could only address up to 1 Mb (which was 1,048, 576 locations) of memory. Extended memory is the name given to addresses beyond lMb and can be used with later processors such as the '286, '386 and '486.
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