Int 62 Fn 0064  u - Fgdriver V4.02 - "fg_invert" - Invert Orientation Of   [V]

   AX = 0064h
   ES:BX -> bitmap
   CX = width of bitmap in bytes
   DX = height of bitmap in pixel rows

Return: nothing

Note:  the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145 at AX=0000h)