Epson ActionNote ユーザーズマニュアル

is memory with addresses in the range 1MB to

8MB, and is used only by the following:

Certain operating systems, such as OS/2

Some MS-DOS interfaces, such as Windows

Some RAM disk programs, such as VDISK

Some hard disk caching programs, such as SMARTDRV

Certain specially-written MS-DOS applications.

Use of extended memory requires a memory manager. Most

versions of MS-DOS include a standard extended memory

manager. If you are using MS-DOS, Windows, and other

compatible programs, it is best to use one of the memory

managers (such as HIMEM.SYS) that came with your software

because these memory managers have been tested and proven

reliable.

Most MS-DOS commands and application programs cannot use

extended memory directly. They need to use 

which uses a portion of reserved memory as a window to

access RAM beyond 1MB. This type of memory allows some

MS-DOS applications to get around the 640KB size limitation.

You control expanded memory with a memory manager (such

as EMM386.EXE), which enables the computer to use extended

memory as expanded memory.