01232.pdf

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SENSATION!
(250-1650)
Memory Management
Faxback Doc. # 1232
Your application documentation contains some suggestions for optimizing the
computer's memory. To learn about memory management utilities, review this
chapter, and then review the appropriate chapters in your application
documentation.
Some memory management terms are defined below:
BASE RAM--Memory below 640KB; used by MS-DOS and all MS-DOS applications.
SHADOW RAM--Memory from 640KB to 1024KB (1MB); used by the system BIOS,
video BIOS, and other extensions.
EXTENDED MEMORY--Contiguous memory above 1MB; can be addressed directly by
i486 microprocessors. Often used for software disk caches, RAM disks, and
software print spoolers. MS-DOS 5.0 includes an extended memory manager
called HIMEM.SYS. Refer to your MS-DOS 5.0 documentation for information
about HIMEM.SYS.
┌───────────────────┐
│
│
│
│
│
Extended
│
│
Memory
│
│
(Up to 31 MB)
│
├───────────────────┤
│
│
│
Shadow RAM
│
│
(384KB)
│
├───────────────────┤
│
Base RAM
│
│
(640KB)
│
└───────────────────┘
Up to 32 MB
1024 KB (1MB)
640 KB
0 KB
Base RAM, Shadow RAM, and Extended Memory:
In addition to the three areas of memory illustrated previously, your
computer supports the creation of expanded memory, or EMS memory, from
extended memory. EMS memory increases your system's efficiency by paging
large sections of memory in and out of an area called a page frame. Many
application programs are designed to use EMS memory; such programs require
the installation of an expanded memory manager driver.
EMM386.EXE is an expanded memory manager driver included with MS-DOS 5.0.
Refer to MS-DOS 5.0 documentation for instructions on installing and using
EMM386.EXE.
(smm 08/06/93)

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