INT 10 - VIDEO - DRAW ONE PIXEL (Hercules GRAFIX)
        AH = 46h
        DI = x (0-720)
        BP = y (0-347)
Note:   function 44h determines operation and function 43h which page to use
SeeAlso: AH=0Ch,AH=47h,AH=49h,AH=4Ch,AH=4Dh

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