User Setup Information

Reserved memory is memory in the range 640KB to 1MB. The
system enhances its performan
ce by using 256KB of this
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 memory is memory with addresses
in the range 1MB to
the maximum system memory, and can be used only by the
following:
0
0
a
0
0
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 managershave been tested and proven
reliable.
Most MS-DOS commands and application programs cannot use
extended memory directly. They need to use expanded memory.
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