Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 12h Subfunction 33h
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  Interrupt:   10h     Function:   12h     Subfunction:   33h
 
  Title:       Enable/Disable Gray-Scale Summing
 
  See also:    Set Gray-Scale Values
 
  Description:                                              [MCGA] [VGA]
 
     Enables or disables gray-scale summing for the currently active
     display. When enabled, gray-scale summing occurs during display
     mode selection, palette programming, and color register loading.
 
     Input                                      Output
 
     AH = 12h                                   If function supported
     AL = 00h to enable gray-scale summing        AL = 12h
        = 01h to disable gray-scale summing
     BL = 33h
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