One of the earmarks of a true 8-bit RPG of that era was the use of trees as "walls" in the game to keep you within the confines of the area of the game. They often frammed the screen or divided it to keep the character away from certain sections or to create mazes within. The 8-bit legendary game, Legend of Zelda, used this method of wall of trees as well. With this cache you, too, can encounter the "wall" that Link often did but you can do something you Link could not - go through or under them.
You are seeking a BIT cache hidden within the "wall of trees".