                             DELRINA CORPORATION

        895 Don Mills Road                6830 Via Del Oro
         500-2 Park Centre                    Suite 200
         Toronto, Ontario               San Jose, California
          Canada M3C 1W3                  U.S.A. 95119-1353

NORTH AMERICAN SUPPORT
Bulletin Board (BBS): (416) 441-2752     WinComm:            (416) 443-4395
Fax InfoLine:         (416) 443-1614     Forms Products:     (416) 441-3086
Fax:                  (416) 441-0774     Macintosh Products: (416) 441-2457
DosFax/WinFax/LITE:   (416) 441-0921     Network Products:   (416) 441-1928
WinFax PRO 4.0:       (416) 443-4390     Premium Support:    (800) 561-0820

U.K. SUPPORT
General Support:      44-81-207-3163     Fax:                44-81-207-5316

===========================================================================
                   T E C H N I C A L    N O T E S

                         Product: WinFax PRO 4.0
                    Document No.: 6036
                   Document Date: July 7, 1994
===========================================================================
Subject: Receiving "Divide by Zero" Errors at High Video Resolutions

Situation:
==========
You are receiving numerous "Divide By Zero" errors when:

- installing
-  sending faxes from other applications
-  using the Cover Page Designer or Viewer in higher resolutions and 
   color depth.

Solution:
=========
The WinFax Viewer makes use of generic Windows bitmap scaling services 
(code).  The code that provides this service physically resides within the 
video driver.  Video drivers with large numbers of colors use modified 
versions of the basic scaling code to support the color depth 
(256, 32,000, or 16 million colors). If the code is not implemented 
properly then the "Divide By Zero" error occurs.

If you are using a non-standard windows driver, this may cause these 
errors. This problem is typical of video drivers displaying more than 256 
colors at a time. Switch to a standard VGA driver and see if this 
alleviates or corrects the problem. If it does, contact your hardware 
manufacturer and inquire about updates to your video drivers.

If moving to a different -- lower resolution, fewer colors -- video driver 
does not eliminate the problem, make sure that any upper memory areas that 
the video card is using are excluded by your memory manager.

The memory addresses that are usually used for VGA  video cards are 
C000-C7FF.  Some 16 and 24 bit capable video cards will use the monochrome 
memory areas in addition to the memory area for VGA. Check the 
documentation that came with the video card for additional information 
regarding the use of upper memory areas.

