expanded memory

   An MS-DOS mechanism by which applications can access more than the 640KB of memory normally available to them. The architecture of the early Intel processors restricted the original IBM PC to accessing 1MB of memory, 640KB of which was available for applications; the remaining 384KB was reserved for system use, the BIOS, and the video system. At that time, 640KB was more than ten times the amount of memory available in other personal computers. However, as both applications and MS-DOS grew, they began to run out of room.
   The Expanded Memory Specification LIM 4.0 let programs running on the Intel family of processors access as much as 32MB of expanded memory. The expanded memory manager (EMM) creates a block of addresses into which data (held in memory above the 1MB limit) is swapped in and out as needed by the program. In other words, a 64KB segment of addressable memory creates a small window through which segments of expanded memory can be seen, but only one segment at a time.

Dictionary of networking . 2014.

Look at other dictionaries:

  • Expanded Memory —   [dt. Expansionsspeicher], EMS …   Universal-Lexikon

  • Expanded memory — In computing, expanded memory (commonly known as EMS memory) is a system of bank switching introduced around 1984 that provided additional memory to MS DOS programs that required more than what was available in conventional memory. Expanded… …   Wikipedia

  • expanded memory — computer memory between 640K and 1 MB (Computers) …   English contemporary dictionary

  • Expanded memory — …   Википедия

  • Expanded Memory Manager —   [Abk. EMM, dt. »Expansionsspeicherverwalter«], Gerätetreiber unter DOS, der für die Verwaltung des EMS Speichers zuständig war (EMS) …   Universal-Lexikon

  • Expanded Memory Specification — Expanded Memory Specification,   EMS …   Universal-Lexikon

  • Expanded Memory System — Die Expanded Memory Specification (kurz: EMS genannt), ist eine Software Schnittstelle zum Zugriff auf so genanntes expanded memory (oft unglücklich zu Expansionsspeicher eingedeutscht) auf einem x86 kompatiblen PC im Real Mode. Heutzutage hat… …   Deutsch Wikipedia

  • Expanded Memory Specification — Die Expanded Memory Specification (kurz: EMS genannt), ist eine Software Schnittstelle zum Zugriff auf so genanntes expanded memory (oft unglücklich zu „Expansionsspeicher“ eingedeutscht) auf einem x86 kompatiblen PC im Real Mode. Sie war für PC… …   Deutsch Wikipedia

  • expanded memory emulator — program for managing memory which emulates expanded memory (Computers) …   English contemporary dictionary

  • Expanded Memory Specification —    Abbreviated EMS. The original version of the Lotus Intel Microsoft Expanded Memory Specification (LIM EMS), which let MSDOS applications use more than 640KB of memory space.    These days Microsoft Windows running in protected mode on 80386… …   Dictionary of networking

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