INT 62 u - FGDRIVER v3.03 - "FG_DEFPAGES" - DEF SRC/DEST PAGES FOR BLOCK XFERS
        AX = 0017h
        BX = source page
        CX = destination page
Desc:   specify the source and destination SVGA banks for block transfers on
          extended video pages
Notes:  For FGDRIVER v1.10, this function was "FG_PALETTE" (see AX=006Fh);
          "FG_DEFPAGES" did not exist yet
        This function is ignored if the video controller does not support
          extended pages or the current video mode does not allow them
SeeAlso: AX=0012h,AX=00A9h

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