Ant Attack: Routine at 89D0

89D0: Move an object, or count down its explosion and send it home

Used by the routines at MOVE_PLAYER, MOVE_GRENADE, MOVE_ANT and MOVE_RESCUEE. While the explosion countdown runs the object does not move, and when it runs out the object goes back to its home position. The player starts every level this way: BASIC sets its countdown to 1, so the first frame puts it at the city gate.
MOVE_OR_RESPAWN	89D0	LD A,(IX+$09)
	89D3	AND A
	89D4	JR NZ,MOVE_OR_RESPAWN_0
	89D6	CALL MOVE_OBJECT
	89D9	RET
MOVE_OR_RESPAWN_0	89DA	DEC A
	89DB	LD (IX+$09),A
	89DE	RET NZ
	89DF	LD A,(IX+$0A)	Home.
	89E2	LD (IX+$00),A
	89E5	LD A,(IX+$0B)
	89E8	LD (IX+$01),A
	89EB	LD A,(IX+$0C)
	89EE	LD (IX+$02),A
	89F1	XOR A	Not falling, not stunned, standing.
	89F2	LD (IX+$05),A
	89F5	LD (IX+$06),A
	89F8	LD (IX+$08),A
	89FB	RET