screen_up
screen_up(ip, sy - count, ip->bottom_margin, count);
static void screen_up(struct ite_softc *, int, int, int);
screen_up(ip, sy - count, ip->bottom_margin, count);
static void screen_up(struct ite_softc *, int, int, int);
screen_up (ip, sy, ip->bottom_margin, count);