INT 62 u - FGDRIVER v3.03 - "FG_TCDEFINE" - DEFINE TRANSPARENCY OF COLOR INDEX
        AX = 00A4h
        BX = color index
        CX = transparency (00h opaque, other transparent)
Notes:  For FGDRIVER v1.10, this function was "FG_GETDACS" (see AX=0035h);
          "FG_TCDEFINE" did not exist yet
        This function is ignored in text modes
SeeAlso: AX=00A5h,AX=00A6h

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