D.2.1
Extended Memory
Extended Memory is defined as internal system RAM above 1024 KB.
MS-DOS or your applications (that support Extended Memory) can access
Extended Memory if your system is configured with an Extended Memory
driver (XMS). Extended Memory drivers manage the Extended Memory
ensuring that two programs do not use the same part of memory. The
enhanced mode of MS Windows uses Extended Memory to multitask
applications.
MS-DOS includes the HIMEM.SYS Extended Memory driver. HIMEM.SYS is
defined in your CONFIG.SYS file where it is automatically loaded each time
you boot the system. HIMEM.SYS also enables MS-DOS programs to use an
extra 64-KB region located just above the 1-MB mark for storage of code
and data. This area is known as high memory area (HMA).
n
Note:
MS-DOS
can also be loaded in
HMA
to free up conventional memory. Re-
fer to your
MS-DOS User’s Manual
for instructions.
n
Note:
Some application programs that run in 386 enhanced mode (such as
Windows) require special Extended Memory managers. Use the Extended
Memory manager provided with your application, if available. Otherwise,
use HIMEM.SYS, the MS-DOS version furnished with the computer.
You can define part of Extended Memory as one or more RAM disks using
the RAMDRIVE.SYS device driver. Details are provided in the paragraph
D.2.2.
D.2.2
Expanded Memory
Expanded Memory conforms to the Expanded Memory Specification (EMS)
developed by Lotus/Intel/Microsoft (LIM) known as LIM-EMS. Your
computer supports EMS version 4.0.
Expanded Memory is accessed by allocating an area (usually 64 KB) of
system memory between 640 KB and 1 MB (and between 256 KB and 640
KB when the
/O
option is used) as a “window.” Pages or segments of data
are passed to and from Expanded Memory through this window, which is
called the
page frame
. The page frame is divided into at least four physical
pages of 16 KB each.
The total amount of internal memory above 640 KB can be assigned to
either Extended Memory (XMS) or Expanded Memory (EMS), depending on
your requirements and which driver is installed.
n
Note:
MS Windows can use both
XMS
and
EMS
in 386 Enhanced mode when
properly configured. Refer to your
Windows User’s Guide
for details and in-
structions.
D-2
Configuring
Memory
Summary of Contents for TravelMate 5000 Series
Page 1: ...Maintenance Manual TravelMate 5000 Series Notebook Computers 9786166 0001 March 1995 ...
Page 47: ...Figure 1 16 TM5000 Series Functional Block Diagram 1 30 General Description ...
Page 95: ...Figure 4 2 Notebook Detailed Block Diagram Troubleshooting Procedures 4 3 ...
Page 149: ...Figure 6 4 Main Board P54 75MHz P N 9798803 0001 Sheet 2 of 2 6 14 Illustrated Parts Listing ...
Page 172: ...Figure 6 7 Keyscan Board P N 9786209 0001 Illustrated Parts Listing 6 37 ...
Page 180: ...Figure 6 11 Inverter Board P N 9786134 0001 Illustrated Parts Listing 6 45 ...
Page 185: ...Figure 6 12 DAB Board P N 9786273 0001 6 50 Illustrated Parts Listing ...
Page 228: ...Figure 7 5 Figure 7 5 IR Board P N 9798813 Logic Diagram Sheet 1 of 2 7 42 Schematic Diagrams ...
Page 229: ...Figure 7 5 Figure 7 5 IR Board P N 9798813 Logic Diagram Sheet 2 of 2 Schematic Diagrams 7 43 ...
Page 239: ...Figure A 1 Code Page 437 United States A 2 Character Sets ...
Page 240: ...Figure A 2 Code Page 850 Multilingual Character Sets A 3 ...
Page 241: ...Figure A 3 Code Page 863 Canadian French A 4 Character Sets ...
Page 242: ...Figure A 4 Code Page 865 Nordic Character Sets A 5 ...
Page 286: ...Printed in U S A ...
