Avalon: Routine at C89F

C89F: Deal with and check room item, creature or scenery

Used by the routine at C837.
The first byte of the working data set at EB43 (this data is copied from each of the 16 byte room item data sets at 7C00) is checked here. It indicates the type of room object that needs to be drawn, checked or generally dealt with.
C89F	LD A,($EB43)
C8A2	CP $01	Back wall bricks/scenery, or door frames, wall/floor connector graphics or cursor
C8A4	JP Z,$D27D
C8A7	CP $02	Door
C8A9	JP Z,$C8DC	Door
C8AC	CP $03	Creature
C8AE	JP Z,$CD88	Creature
C8B1	CP $04	Interactable objects (e.g. key, chest, scroll)
C8B3	JP Z,$CB00	Interactable objects (e.g. key, chest, scroll)
C8B6	CP $05	Missile fired by creature/warlock
C8B8	JP Z,$D09B	Missile fired by creature/warlock
C8BB	CP $06	Vertical back wall/floor connector (left)
C8BD	JP Z,$D161	Vertical back wall/floor connector (left)
C8C0	CP $07	Vertical back wall/floor connector (right)
C8C2	JP Z,$D170	Vertical back wall/floor connector (right)
C8C5	CP $08	Missile fired by Maroc
C8C7	JP Z,$D09B	Missile fired by Maroc
C8CA	CP $0F	Tunnel position (& direction)
C8CC	JP Z,$D179	Tunnel position (& direction)
C8CF	CP $0E	Tunnel item (side boundary wall, bat or spider)
C8D1	JP Z,$D1D2	Tunnel item (side boundary wall, bat or spider)
C8D4	CP $20	Room position & viewport
C8D6	JP Z,$D26E	Room position & viewport
C8D9	JP $D27D	Jump from here if nothing to deal with. Data set room items that are no longer present (e.g. a destroyed creature) will have this byte set to 0 to indicate they no longer exist.