AST RESEARCH, INC.        TECHNICAL BULLETIN # 1710          05/06/97 
 
 
 
TITLE:  SiS6205 Shows 1280x1023 Resolution Only
 
 
ISSUE 
 
   After using the SiS Tools to set the video resolution to 
   1280x1024, the Display Setting under Windows 95 Control Panel 
   shows the resolution is set to 1280x1023 instead of 1280x1024.
   
   This issue affects all the systems equipped with the SiS 6205 
   video chip.    

 
BACKGROUND 
 
   According to SiS, the 6205 display driver is designed to only 
   show 1023 scan lines at 1280x1024x256 color display mode. The 
   1024th scan line is blank, and the extra memory left from not 
   displaying the last scan line is used for graphics performance 
   enhancement.
   
   The impact of dropping one line from 1024 lines is negligible to 
   the end user.    

 
ACTION 
 
   SiS 6205 is designed to show an actual resolution of 1280x1023 
   when set to 1280x1024x256 color display mode. 
   
   There is no need to take any action as the system is operating as 
   designed.    

 
NOTES 
 
   N/A    

 
TAN APR 2018EL 
 
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