Int 62 Fn 00C4  u - Fgdriver V4.02 - "fg_tcdefine" - Define Transparency   [V]

   AX = 00C4h
   BX = color index
   CX = transparency (00h opaque, other transparent)

Notes: the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145 at AX=0000h)
   This function is ignored in text modes

See Also: AX=00C5h,AX=00C6h