Used by the routines at Draw_Room, Handle_Sabreman_On_Rope, Handle_Sabreman_Walking, Handle_Sabreman_Jumping, Handle_Sabreman_Falling, Handle_Sabreman_Tumbling, Lower_Rope, Set_Up_Rope, Set_Up_Room_Objects, Handle_Flying_Creature, Handle_Jellyfish, Move_Thrown_Weapon, Handle_Falling_Stalactite, Move_Distant_Bubble, Handle_Bubble, Handle_Carrying_Eagle, Handle_Carried_Sabreman, Handle_Weapon_Pickup, Handle_Distant_Weapon, Start_Tumbling_Inside_Walls and Handle_Gargoyle.

Reads the world map entry of the room that the object at IX is in. The first byte of an entry is made up of eight flags that say which parts of the frame of the room are present (see Draw_Room).