Atic Atac: Routine at 9291

9291: Draw everything in the player's room

Used by the routine at MAIN_LOOP_MONSTERS. Walks the eight-byte records from the player up to the monster table, drawing each one whose room matches the player's and skipping any whose sprite is zero. It is the sweep that puts the room's objects, doors and the player back on the screen after the play area has been cleared.
DRAW_ROOM_CONTENTS	9291	LD IX,$EA90	From the player upwards.
DRAW_ROOM_CONTENTS_0	9295	LD A,(IX+$00)	A zero sprite is an empty slot.
	9298	AND A
	9299	JR Z,DRAW_ROOM_CONTENTS_1
	929B	LD A,($EA91)	And only things in this room.
	929E	CP (IX+$01)
	92A1	JR NZ,DRAW_ROOM_CONTENTS_1
	92A3	CALL DRAW_THING	Draw it.
DRAW_ROOM_CONTENTS_1	92A6	LD DE,$0008	Eight bytes to the next.
	92A9	ADD IX,DE	Eight bytes to the next.
	92AB	PUSH IX
	92AD	POP HL
	92AE	LD DE,$EE60
	92B1	AND A
	92B2	SBC HL,DE
	92B4	JR C,DRAW_ROOM_CONTENTS_0
DRAW_ROOM_CONTENTS_2	92B6	LD A,(IX+$00)
	92B9	AND A
	92BA	JR Z,DRAW_ROOM_CONTENTS_3
	92BC	LD A,($EA91)
	92BF	CP (IX+$01)
	92C2	JR NZ,DRAW_ROOM_CONTENTS_3
	92C4	CALL DRAW_THING
DRAW_ROOM_CONTENTS_3	92C7	LD DE,$0010
	92CA	ADD IX,DE
	92CC	PUSH IX
	92CE	POP HL
	92CF	LD DE,$EEE0
	92D2	AND A
	92D3	SBC HL,DE
	92D5	JR C,DRAW_ROOM_CONTENTS_2
	92D7	RET