Int 10 Fn 0C  - Video - Write Graphics Pixel                               [V]

   AH = 0Ch
   BH = page number
   AL = pixel color
       if bit 7 set, value is XOR'ed onto screen except in 256-color modes
   CX = column
   DX = row

Return: nothing
Desc:  set a single pixel on the display in graphics modes

Notes: valid only in graphics modes
   BH is ignored if the current video mode supports only one page

See Also: AH=0Dh,AH=46h