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For one single display field, the system will automatically read the
 data structure  and produce the sprite on-screen in the colors that are
specified in the sprite's  color registers . If you want the sprite to be
displayed in subsequent display fields, you must rewrite the contents of
the sprite pointers during each  vertical blanking  interval. This is
necessary because during the display field, the pointers are incremented
to point to the data which is being fetched as the screen display

The rewrite becomes part of the  vertical blanking  routine, which can be
handled by instructions in the Copper lists.