Extended Memory Specification An extended memory standard of MS-DOS. EMS uses 1MB or larger memory area in the environment of MS-DOS or Windows on PC/AT compatible machines equipped with CPU of 80286 or greater.
eXtended Memory Specification (hardware)
Abbreviation for eXtended Memory Specification.
XMS (Extended Memory) is the memory above 1088k which is used for DOS programs requiring more memory than available in conventional memory.
n. See extended memory specification.