Intermec 6100 Reference Guide

Page of 328
SECTION 5
Communications and Device Support
PEN*KEY
R
 6100 Computer Programmer’s Reference Guide    5-23
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6100 Memory
Overview
Sometimes, while installing programs, if you load some of them into the High
Memory Area (HMA), this frees some conventional memory for use by your apĆ
plication.
To better understand the use of these memory areas, refer to the description and
the diagram in the Memory Overview paragraph of Appendix B, Common
PEN*KEY 6000 Series Information.
Keep in mind that using the HMA could prevent you from creating the maximum
RAM drive on the 6100 Computer.  There is a relationship between RAM drives
and Extended memory.  A RAM drive uses Extended memory to store its inforĆ
mation.  So, when you create a oneĆmegabyte RAM drive, you are using one
megabyte of Extended memory.  On a twoĆmegabyte 6100 Computer, there is
only one megabyte of Extended memory.  Therefore, using up to 64K of HMA to
load programs high takes away from the memory available for the RAM drive.
Using Expanded Memory on the 6100 Computer
The only reason you should use Expanded memory is if your application can acĆ
cess it.  PenRight applications are good examples of programs that have the abilĆ
ity to use Expanded memory.
For information on Expanded memory, refer to the Memory Overview paragraph,
in Appendix B, Common PEN*KEY 6000 Series Information.
The following information describes how to setup a CONFIG.SYS file so your apĆ
plications can use extended memory.
EXAMPLE:
CONFIG.SYS file
device=d:\himem.sys /machine:2
rem The following line is for configurations loading NORCS drivers:
device=d:\elanump.sys /x=C000,D400,D800,DC00,E000
device=emm386.exe x=A000–D3FF i=D400–E3FF frame=D400 x=E400–FFEF
DOS=UMB
.
.
.
install=fixemm.exe
5. Communications
and Device Support