Chase H.Q.: Routine at 85E4

85E4: Reveals the perp's car on the pre-game screen

Used by the routine at run_pregame_screen.
reveal_perp_car	85E4	LD A,($8007)	Return if wanted_stage_number is 5 (the perp's car is hidden on the pre-game screen for that stage)
	85E7	CP $05
	85E9	RET Z
The perp's car is revealed from the bottom-up.
	85EA	LD A,$00	Load height counter (self modified)
	85EC	INC A	Increment it
	85ED	CP $32	Max height is 50
	85EF	JR C,rpc_height_max_ok
	85F1	DEC A
rpc_height_max_ok	85F2	LD ($85EB),A	Update height counter
	85F5	LD HL,($5D10)	Load address of perp's car LOD
	85F8	LD D,$00	Read lod.width_bytes
	85FA	LD E,(HL)	Read lod.width_bytes
	85FB	INC HL	Read lod.height
	85FC	INC HL
	85FD	LD B,(HL)
	85FE	CP B	If height counter < lod.height B = height counter
	85FF	JR NC,rpc_height_lod_ok
	8601	LD B,A
rpc_height_lod_ok	8602	INC HL	Load address of bitmap data
	8603	LD A,(HL)
	8604	INC HL
	8605	LD H,(HL)
	8606	LD L,A
	8607	LD A,E	Stride of bitmap data in bytes (D is still zero)
	8608	EXX	Bank for plot_sprite entry
	8609	LD HL,$F4CD	Address in back buffer to plot at
	860C	JP plot_sprite	Exit via plot_sprite