extended memory specification การใช้

• Microsoft developed a standard known as the Extended Memory Specification ( XMS ).
• The second specification was the Extended Memory Specification ( XMS ) for 80286 and later systems.
• Prior to DOS extenders, if a user installed additional memory and wished to use it under DOS, they would first have to install and configure drivers to support either expanded memory specification ( EMS ) or extended memory specification ( XMS ).
• The later eXtended Memory Specification ( XMS ), also now obsolete, is a standard for, in principle, simulating bank switching for memory above 1 MB ( called " extended memory " ), which is not directly addressable in the Real Mode of x86 processors in which MS-DOS runs.