int game_init_op(void)
{
#if GAME >= 4
# define PARAS (mem_assign_paras)
#else
# define PARAS (MEM_ASSIGN_PARAS_OP)
#endif
	if(mem_assign_dos(PARAS)) {
		return 1;
	}
#undef PARAS

	vram_planes_set();
	graph_start();
	graph_clear_both();
	vsync_start();
	key_beep_off();
	text_systemline_off();
	text_cursor_off();
	egc_start();
	pfkey = PF_KEY;
	pfstart(pf_fn);
	return 0;
}