ZSKBD_CTRL_B
sc->sc_dc->kbd_conf[ZSKBD_CTRL_B] = 0;
dc->kbd_conf[ZSKBD_CTRL_A] &= ~(a_off | ZSKBD_CTRL_B);
dc->kbd_conf[ZSKBD_CTRL_B] &= ~b_off;
dc->kbd_conf[ZSKBD_CTRL_B] |= (b_on | ZSKBD_CTRL_B);
if (sc->sc_dc->kbd_conf[ZSKBD_CTRL_B] & ZSKBD_CTRL_B_SCRLK)