What is expanded memory? - Definition from WhatIs.com
Part of the Computing fundamentals glossary:

Expanded memory, also know as EMS (Expanded Memory Specification) was a method used to increase the 640KB upper limit of MS-DOS to 1MB using a gated memory riser card.

After the advent of extended memory, programs written to use EMS would be redirected by driver emulation to use extended memory instead, which did not rely upon special hardware but just increasing RAM capacities. Extended memory can only be addressed by software running in protected mode as all but the small portion of high memory are unreadable by programs running in standard real mode.

Expanded memory is a distinct technology from the similarly named extended memory, which replaced EMS with greater capacity when it was introduced with the Intel 80286.

Fun fact: The 640KB upper limit of DOS is the alleged source of the often-quoted but steadfastly denied Bill Gates statement: “640KB ought to be enough for anyone.”

This was last updated in February 2014
Contributor(s): Matthew Haughn
Posted by: Margaret Rouse

Related Terms

Definitions

  • project management

    - Project management is a methodical approach that uses established principles, procedures and policies to guide a project from start to finish to produce a defined outcome. (SearchCIO.com)

  • haptics

    - Haptics (pronounced HAP-tiks) is the science of applying touch (tactile) sensation and control to interaction with computer applications. (WhatIs.com)

  • business continuance (business continuity)

    - Business continuance (sometimes referred to as business continuity) describes the processes and procedures an organization puts in place to ensure that essential functions can continue during and a... (SearchStorage.com)

Glossaries

  • Computing fundamentals

    - Terms related to computer fundamentals, including computer hardware definitions and words and phrases about software, operating systems, peripherals and troubleshooting.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question. Find an Answer.Powered by ITKnowledgeExchange.com

Ask An IT Question

Get answers from your peers on your most technical challenges

Ask Question

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.