Chase H.Q.: Routine at 8E29

8E29: Spreads each playfield row's attribute rightwards from column 1

The caller, scenery_hit for instance, has already set the attribute at column 1 of every row; this copies it across the 28 columns to its right, one row at a time, with a rolling LDIR that copies each row's first byte over the rest of the row. After 16 rows transition_control is set to stop. Used by the routines at check_user_input, handle_perp_caught and transition.
fill_attributes	8E29	LD HL,$5901	Screen attribute position (1,8)
	8E2C	LD B,$00	Clear B for C to be set in a moment
	8E2E	LD A,$10	16 rows of attributes
fill_attributes_0	8E30	LD D,H	Destination address
	8E31	LD E,L	Destination address
	8E32	LD C,$1C	28 bytes to copy: the source column is already set, so 28 writes fill columns 2..29, giving 29 filled columns
	8E34	INC E	Dest++
	8E35	LDIR	Fill by 'rolling'
	8E37	INC HL	Skip four (32 wide - 28)
	8E38	INC HL
	8E39	INC HL
	8E3A	INC HL
	8E3B	DEC A	Row counter--
	8E3C	JR NZ,fill_attributes_0	Loop until it hits zero
	8E3E	LD ($A231),A	transition_control = 0
	8E41	RET	Return