What Does Expanded Memory (EM) Mean?
Expanded memory (EM) is an overarching or umbrella term for several technology variants that do not necessarily work with each other or are directly related to each other. However, these technologies were meant to solve the same problem, the 640 KB limit on usable memory for programs in the DOS operating system. The most widely used expanded memory variant was the Expanded Memory Specification (EMS) or the LIM EMS.
Techopedia Explains Expanded Memory (EM)
Expanded memory refers to various methods for allowing the use of more than the default 640 KB limit imposed by the DOS operating system. The most widely used expanded memory system was the specification jointly developed by Lotus Software, Intel and Microsoft, which was simply called the Expanded Memory Specification. But to differentiate it from the others, it was sometimes referred to as the LIM EMS to denote the developers. The first widely used version was the EMS 3.2, which was able to support up to 8 MB of expanded memory.
