)
Values for Tseng ET4000 refresh rate:
 CX	640x480	800x600	  1024x768/1280x1024
 00h	60 Hz	 56 Hz	   interlaced
 01h	72 Hz	 60 Hz	   60 Hz
 02h	75 Hz	 72 Hz	   70 Hz
 03h	90 Hz	 75 Hz	   75 Hz
 04h	--	 90 Hz	   --