Epson 7500 User Manual download pdf (Page 51)

Reserved

memo

y is addressable memory in the range 640KB to

1MB. Normally, a video card or option card must provide the

physical RAM for these addresses. The system can enhance its

performance by using 128KB of this extra memory as shadow

RAM. Some of the remaining memory may be available; see

Appendix A of the User’s

Guide

for information on how your

computer uses this memory.

Extended memo

y is memory with addresses in the range 1MB to

the maximum system memory, and can be 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, protected mode MS-DOS

applications.

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

expanded memo y.

This type of memory allows some MS-DOS applications to get

around the 640KB limitation. You control expanded memory

with a memory manager (such as EMM386.EXE), which enables

the computer to use your extended memory as expanded

memory.

A-2 Using Memory

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Epson 7500 User Manual Page 51