INT 62 u - FGDRIVER v3.03 - "FG_TCMASK" - SET TRANSPARENT COLORS
        AX = 00A5h
        BX = colors to consider transparent (bit 0 = color 0, etc)
Notes:  For FGDRIVER v1.10, this function was "FG_SETDACS" (see AX=008Eh);
          "FG_TCMASK" was AX=005Eh
        This call is ignored in text modes
        The specified colors are considered transparent by "FG_TCXFER"
SeeAlso: AX=00A4h,AX=00A6h

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