Atic Atac: Routine at 9F74

9F74: Set up the drawing address in both register banks

Runs the same setup twice, once per bank, keeping DE across the first call so the second gets the same argument, and then joins the erase path at ALIGN_ROWS. Like NEXT_PIXEL_ROW, nothing reaches it: no call, no jump, no table entry. SETUP_ERASE immediately after it is the version the game actually uses.
SETUP_BOTH_BANKS	9F74	PUSH DE	DE is wanted twice, so it is kept over the first call.
	9F75	CALL SETUP_ERASE_ALT	DE is wanted twice, so it is kept over the first call.
	9F78	EXX	The second bank gets the same argument.
	9F79	POP DE
	9F7A	CALL SETUP_AT_POSITION
	9F7D	EXX
	9F7E	JR ALIGN_ROWS