Control the writing of the tag buffer.
Allow updates to the tag buffer. The initial value is one (1) and it means the tag buffer of the FT800 is updated with the value given by the Tag command.
Therefore, the following graphics objects will be attached to the tag value given by the TAG command.
The value zero (0) means the tag buffer of the FT800 is set as the default value, rather than the value given by Tag command in the display list.
Every graphics object drawn on screen is attached with the tag value which is defined in the FT800 tag buffer.
The FT800 tag buffer can be updated by Tag command.
The default value of the FT800 tag buffer is determined by ClearTag and Clear_B commands.
If there is no ClearTag command present in the Display List, the default value in tag buffer shall be 0.
TagMask command decides whether the FT800 tag buffer takes the value from the default value of the FT800 tag buffer or
the Tag command of the Display List.