INT 10 - VIDEO - Compaq SLT/286 - WRITE COLOR MIX REGISTERS
        AX = BF08h
        CH = bits 7-4 green weight
             bits 3-0 blue weight
        CL = bits 7-4 unused
             bits 3-0 red weight
SeeAlso: AH=12h/BH=33h,AX=BF07h

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