Knight Lore: Routine at AFC7

Used by the routine at ret_from_tbl_jp.

The stack is reloaded to $5BA0 for every object, so it grows downwards into the printer buffer below and nothing a handler leaves on it can leak into the next one. The loop pushes its own continuation, ret_from_tbl_jp, before dispatching, so an object handler ends with a plain RET -- and a handler can jump away mid-routine, to another handler or out to the game-over code, without tidying the stack.

$5BBC counts up by one per object, so two objects of the same kind see opposite parities in the same frame; upd_176_177 uses that to make neighbouring fires flicker out of step.

Used by the routine at ret_from_tbl_jp. The stack is reloaded to $5BA0 for every object, so it grows downwards into the printer buffer below and nothing a handler leaves on it can leak into the next one. The loop pushes its own continuation, ret_from_tbl_jp, before dispatching, so an object handler ends with a plain RET -- and a handler can jump away mid-routine, to another handler or out to the game-over code, without tidying the stack. $5BBC counts up by one per object, so two objects of the same kind see opposite parities in the same frame; upd_176_177 uses that to make neighbouring fires flicker out of step.
update_sprite_loop	AFC7	LD SP,$5BA0	reset the stack for this object
	AFCA	LD HL,$5BBC	this object's phase: the frame counter plus its place in the table
	AFCD	INC (HL)
	AFCE	LD HL,ret_from_tbl_jp	push the return address the handler will RET to
	AFD1	PUSH HL	push the return address the handler will RET to
	AFD2	CALL save_2d_info	keep last frame's screen rectangle so the old image can be wiped