Intermec 6200 Reference Guide

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Conventional Memory Ċ (Up to 640 KB) That area of memory in which most

DOS applications run.  Other programs that could reside there include portions

of DOS and any programs called using a device=" or install=" line in the CONĆ

FIG.SYS file or any programs that are not executed with a loadhigh" from the

AUTOEXEC.BAT file.
UMA Ċ Just above conventional memory.  UMA provides memory for system

hardware.  Any memory not used by the system is usable.  The device=ump.sys. .

." and DOS=UMB" lines, in the CONFIG.SYS file, provide access to UMA.  After

UMP.SYS is loaded and DOS=UMB" specified, other drivers are loaded into

UMA using devicehigh=" in the CONFIG.SYS file or loadhigh" in the

AUTOEXEC.BAT file.
HMA Ċ Memory residing above conventional and upper memory.  If

DOS=HIGH" is specified in the CONFIG.SYS file, this loads part of DOS into

HMA.  This is possible if HIMEM.SYS is loaded before the DOS=HIGH" stateĆ

ment.  This frees up some conventional memory but lowers the available memory

used for the RAM drive by 64 KB, because HMA contains the lower 64K of exĆ

tended memory.
This combination of conventional and upper memory consists of 1 MB, thus there

is 384 KB of memory for UMA.
Extended Memory Ċ Above UMA and includes HMA.  To access extended

memory, add device=d:\himem.sys" to the CONFIG.SYS file (where d:\" is the

drive and directory where HIMEM.SYS exists).  The most widely known applicaĆ

tion using extended memory is MS Windows.
Expanded Memory Ċ Type of memory simulated by using a program such as

EMM386.EXE, and used by a few specific programs.  Applications created with

the PenRight! development environment are examples of programs that optionĆ

ally use extended memory.  EMM386 can use UMA and extended memory to

simulate expanded memory.

The statements in the left column of the table below can be either uppercase or

lowercase.  They are shown in uppercase here for readability.

Statement

Description

DEVICE=

Loads or installs device drivers into conventional memory from CONFIG.SYS

DEVICEHIGH= Loads or installs device drivers into UMA from CONFIG.SYS
DOS=HIGH

Loads a portion of DOS into HMA when called from CONFIG.SYS

DOS=UMB

Allows programs to run in UMA when called from CONFIG.SYS

UMP.SYS

Provides access to UMA when called with device=" in CONFIG.SYS

EMM386.EXE

Simulates expanded memory when called with device=" in CONFIG.SYS

HIMEM.SYS

Provides access to extended memory when called with device=" in CONFIG.SYS

INSTALL=

Runs an application in conventional memory from CONFIG.SYS

LOADHI

Runs applications in UMA when called from AUTOEXEC.BAT