Int 10 Fn 1A01  - Video - Set Display Combination Code (ps,vga/mcga)       [V]

   AX = 1A01h
   BL = active display code (see #0037)
   BH = alternate display code

Return: AL = 1Ah if function was supported

See Also: AH=12h/BL=35h,AX=1A00h