Int 10 Fn 4B  - Video - Display Character (hercules Grafix)                [V]

   AH = 4Bh
   AL = character to display
   DI = x (0-720)
   BP = y (0-347)

Note:  unlike the other BIOS character functions character position is
     specified in pixels rather than rows and columns

See Also: AH=09h,AH=0Ah