expanded memory

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expanded memory (EMS memory) A way of accessing IBM-PC-type memory above 1 Mbyte by mapping it one 16-Kbyte page at a time into dedicated areas of RAM (called page frames) in the upper memory region lying between 640 Kbyte and 1 Mbyte. Originally developed in conjunction by Lotus, Intel, and Microsoft, the EMS method of increasing the amount of memory accessible to this type of machine has been largely superseded by extended memory (XMS).