Category : Tutorials + Patches
Archive   : WFX4.ZIP
Filename : 6070.TXT

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===========================================================================
T E C H N I C A L N O T E S
Product: WinFax PRO 4.0
Document No.: 6070
Document Date: December 8, 1994
===========================================================================
Subject: Problems Encountered When Viewing at High Resolutions

Situation:
==========
You have switched to a higher video resolution (256, 32,000 or 16 million
colors) in Windows, and are experiencing difficulties with the WinFax PRO
Fax Viewer, the Cover Page Designer, or another part of the program that
displays bitmap images. Typical symptoms include:

- General Protection Faults
- Divide by Zero messages
- graphic images do not appear correctly or at all.
- program freezes when creating a cover page image, or when viewing an
attachment

Solution:
=========
WinFax uses Windows Bitmap Scaling Services to paint bitmap images on your
screen. These services are provided to WinFax through the video driver
used by Windows. Video drivers providing a large color palette use
modified versions of the generic Windows Bitmap Scaling Services code. The
problems outlined above arise from discrepancies in this modified code.

Check with the manufacturer of your video card to see if they have an
updated video driver. If you have the latest version of your video driver,
try switching to another video driver that uses less color, or use a video
driver provided with Microsoft Windows.

Changing Video Drivers in Windows
---------------------------------
1. Make a backup copy of your SYSTEM.INI file. If Windows does not start
properly after changing video drivers, overwrite your revised
SYSTEM.INI with the backup so that you can start again.

2. From Program Manager, select Run from the File menu.

- If you have Windows 3.1, type SETUP and click OK.
- If you have Windows for WorkGroups 3.11, type WINSETUP and click
OK.

The Windows Setup dialog appears.

3. From the Options menu, choose Change System Settings. The Change
System Settings dialog appears.

4. Use the Display drop-down list to select a new video driver setting.
Select Other display from the list if you have a replacement video
driver on diskette.

If switching to a different video driver does not eliminate the problem,
your video card may be trying to access regions of memory that are being
used by Windows.

You may be able to solve this conflict by excluding the range of memory
being used by your video card. Use a Windows text editor, such as Notepad
or SYSEDIT, to open the CONFIG.SYS file and do the following:

- Look for a line that contains the EMM386 memory manager. Edit the line
so that it excludes the range of memory most often used by video cards,
as in the following example:

DEVICE=C:\DOS\EMM386.EXE NOEMS X=A000-C7FF

- Save the changes you have made to the CONFIG.SYS file.
- Exit Windows and reboot your computer for the change to take effect.

Note: Windows often requires the original Windows diskettes when making
changes to the system settings. Make sure you have your original
Windows diskettes available should they be required to load the new
video driver.