Acronym for Expanded Memory Specification. A technique for adding memory to PCs that allows for increasing memory beyond the Intel 80x86 microprocessor real-mode limit of 1 megabyte (MB). In earlier versions of microprocessors, EMS bypassed this memory board limit with a number of 16-kilobyte banks of RAM that could be accessed by software. In later versions of Intel microprocessors, including the 80386 and 80486 models, EMS is converted from extended memory by software memory managers, such as EMM386 in MS-DOS 5. Now EMS is used mainly for older MS-DOS applications because Windows and other applications running in protected mode on 80386 and higher microprocessors are free of the 1-MB limit. Also called: LIM EMS. See also expanded memory, protected mode. Compare conventional memory, extended memory.
In computing, abbreviation for expanded memory specification.

European Monetary System.
Abbreviation for European Monetary System.

1. River 231 miles (372 kilometers) NW Germany flowing N into North Sea.
2. Or Bad Ems town W Germany SE of Koblenz.