river-raid: Routine at 9388

9388: Handle new position attributes when sprite is at screen top (row 0).

Same $03DF wrap handling as set_attr_wrap_old but for new position. Wraps attribute writes to bottom of viewport to preserve row 0 as black.
set_attr_wrap_new	9388	LD BC,$03DF	Add $03DF to HL to correct wrapped address. Restore and re-save BC.
	938B	ADD HL,BC
	938C	POP BC
	938D	PUSH BC
set_attr_wrap_new_loop	938E	LD (HL),A	Inner loop: write attribute A to HL, increment HL, decrement C, repeat for row width.
	938F	INC HL
	9390	DEC C
	9391	JR NZ,set_attr_wrap_new_loop
	9393	POP BC	After row: restore BC, add stride DE, decrement B, re-save BC. Subtract $03DF from HL to maintain wrap. Jump back to set_attr_new_outer_loop for next row.
	9394	ADD HL,DE
	9395	DEC B
	9396	PUSH BC
	9397	LD BC,$03DF
	939A	OR A
	939B	SBC HL,BC
	939D	POP BC
	939E	JP set_attr_new_outer_loop