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Gray Scale Management for VGA Displays
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Toshiba has provided two utilities, VCHAD and DSGSM, to help you
control the way your computer converts colors into levels of gray on
your flat panel screen.
VCHAD:
There may arise situations when two adjacent colored regions on your
screen are displayed at the same or similar gray levels. This will make it
difficult or impossible to distinguish the two regions. For example, suppose
an application displays text on your screen such that the color of the text
and the color of the text background map to the same gray level. This will
cause the text to blend in with the background color.
VCHAD is used to adjust the way colors are converted into levels of
gray. Please refer to your computer's reference manual for more information
on how to use this program.
If you plan to use a mouse driver and VCHAD together on your system,
you must load the mouse driver before you load VCHAD. If you are loading your
mouse driver (e.g., MOUSE.SYS) via CONFIG.SYS, then there is no problem.
If you are loading your mouse driver (e.g., MOUSE.COM) and VCHAD.EXE via
AUTOEXEC.BAT or the command line, then make sure MOUSE.COM is executed before
the VCHAD.EXE.
VCHAD consumes about 38,000 bytes of memory when loaded as a Terminate
and Stay Resident program (TSR). If you are running on a 386SX, 386 or 486
machine you can use a 386 Expanded Memory Manager such as EMM386 to place
TSRs such as VCHAD into an Upper Memory Block. This will provide more
memory to run your application programs. Please refer to your MS-DOS
User's Manual for more information on how to use EMM386 to load VCHAD and
other TSRs into this memory area.
Note that VCHAD does not necessarily have to be run as a TSR. Please
refer to your computer's reference manual for more information on the
operation of VCHAD.
DSGSM:
DSGSM is the DOS Shell Gray Scale Manager utility. This utility is
a Terminate and Stay Resident (TSR) program intended for use with the
Task Swapping function of the MS-DOS Shell (DOSSHELL).
The DOSSHELL allows the user to do task swapping between several
active applications. DSGSM will preserve the individual color-to-gray level
mappings for each active application.
You will need DSGSM only if you use the DOS Shell Task Swapper and
you use VCHAD to change the color-to-gray level mappings.
You must invoke DSGSM before starting the DOSSHELL. This is done
by entering the following command:
DSGSM
An installation message will appear on your screen to indicate that
DSGSM is now loaded.
DSGSM consumes about 4,000 bytes of memory when loaded as a TSR. If you
are running on a 386SX, 386 or 486 machine you can use a 386 Expanded Memory
Manager such as EMM386 to place TSRs such as DSGSM into an Upper
Memory Block. This will provide more memory to run your application programs.
Please refer to your MS-DOS User's Manual for more information on how to
use EMM386 to load DSGSM and other TSRs into this memory area.
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.