This data holds pointers of positions within a room's description string.

Each pointer allows doors to be added or removed based on the current room.

If an exit does not exist, then the data here represents the previous room entered. That way the door can be removed and the room cleaned up.

See code @ 87B0 for usage.

The pointers are as follows:

Pointer to memory to store all of exit data into for exits leading to outside.

Pointer of description string to store room index for which the exit leads to.

Pointer of description string to place door bitmap index.

Pointers for north exit.

Pointers for east exit.

Pointers for south exit.

Pointers for west exit.

These table of pointers describe where in the background strings doors can be inserted.

By default all the basic rooms have no doors when being drawn.

However once entered the descriptions have doors inserted to match the exits in the data.