Krakout: Process every active on-screen object

B9D2: Process every active on-screen object

Draws every active object whose Y lies on the visible playfield, via the sprite drawer. Inactive and off-screen entries are skipped.
draw_all_objects	B9D2	LD IX,object_table	Start at the first pool entry.
	B9D6	LD A,(object_count)	Count the entries.
	B9D9	LD B,A	Count the entries.
draw_all_objects_loop	B9DA	PUSH BC	Save the loop state for this entry.
	B9DB	PUSH IX	Save the loop state for this entry.
	B9DD	BIT 0,(IX+$08)	Active? Skip if not.
	B9E1	JR Z,draw_all_objects_next	Active? Skip if not.
	B9E3	LD A,(IX+$01)	Y position off the bottom of the playfield? Skip.
	B9E6	CP $A7
	B9E8	JR NC,draw_all_objects_next
	B9EA	CP $18	Off the top? Skip.
	B9EC	JR C,draw_all_objects_next	Off the top? Skip.
	B9EE	CALL draw_object	On-screen and active: draw it.
draw_all_objects_next	B9F1	LD BC,$0009	Advance to the next pool entry – 9 bytes per slot – and loop.
	B9F4	POP IX
	B9F6	ADD IX,BC
	B9F8	POP BC
	B9F9	DJNZ draw_all_objects_loop
	B9FB	RET

Routines