pcxShow256()

         Shows a 320x200x256 PCX on the screen

    Syntax:

         pcxShow256 ( cFile, [lPalette], [lDegrade] ) -> lError

         cFile    : Name of the PCX file
         lPalette : A logic indicating if we like the PCX palette or the
                    actual one of the system. If it is .T. then prevails
                    the one from the file. If it is .F. the one from the
                    system. By default is .T.
                    This option is very useful for programs like PaintBrush
                    for Windows that destroys palettes.
         lDegrade : A logic indicating if you like to fix the palette in a
                    progressive way simulating a degrade (.T.) or if we
                    want to fix it in a fast way (.F.). Default value is .F.
                    Only available when lPalette is .T.

    Description:

         The PCX can be any size you want. Forget about the 64 kb
         limitation.

         It only works if a VGA card exists in the system.

         The function does not wait for a key, nor restores the video
         mode, so this is left to the user's responsibility. This is
         very useful when you want to show various PCX files one after the
         other and you do not want to get text mode between one and the other.

    Return:

         .T. if it all has gone well or .F. if the file is not found, the
         system does not have a VGA or the PCX format is incorrect.

    Example:

         noldmode := SetVGA256()
         If pcxShow256 ( "c:\fast\lib\m_roibal.pcx" )
           Inkey(0)
         EndIf
         VideoMode ( noldmode )