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  Interrupt:   10h     Function:   10h     Subfunction:   1Bh
 
  Title:       Set Gray-Scale Values
 
  See also:    Enable/Disable Gray-Scale Summing
 
  Description:                                              [MCGA] [VGA]
 
     Transforms the red, green, and blue values of one or more color
     registers into the gray-scale equivalents. For each color
     register, the weighted sum of its red, green, and blue values is
     calculated (30% red + 59% green + 11% blue) and written back into
     all three components of the color register. The original red,
     green, and blue values are lost.
 
     Input                              Output
 
     AH = 10h                           None
     AL = 1Bh
     BX = First color register
     CX = Number of color registers
                                    -♦-