Texas Instruments TravelMate 3000 WinSX, User Manual

Page: 181 / 219

Memory Device Drivers
The Shadow Rom memory you can select at the Setup Program enables mapping the B10S
and Video BIOS into high speed memory for faster operation. When not selected, the
shadow memory is available for use as Expanded or Extended memory. The shadow
memory area is limited to 128 KB.
Your TravelMate 3000 WinSX provides 4 MB of RAM (main memory) standard. Only
the standard 4 MB can be used as system base memory (640 KB) and shadow memory
(128 KB), and cannot be increased by adding additional memory. However, up to 2 MB
of optional additional memory can be used as Extended and/or Expanded memory and can
be combined with any of the standard 4 MB of memory not used for base or shadow
memory.
See the Microsoft MS-DOS User's Guide and Reference furnished with your new
computer for detailed instructions on installing and configuring expanded memory.
HIMEM.SYS
HIMEM.SYS is an eXtended Memory Manager (XMM) conforming to eXtended Memory
Specifications (XMS), version 2. O. HIMEM.SYS uses 64 KB of the high-memory area
(HMA) at the beginning of Extended memory to store a single TSR program or device
driver, or it uses this area for data storage. This effectively increases the size of standard
memory for use by your main application program. In order to use HMA, you must have
at least 64 KB of Extended memory.
To install HIMEM.SYS in its simplest form, include the following command line in your
CONFIG.SYS file before any other device commands that use Extended memory:
DEVICE=C:\DOS\HIMEM.SYS
In this form, HIMEM.SYS will use default values, and access to HMA will be on a 'first
come-first served' basis.
F-8 Configuring Memory