CBB_CARDEXIST
if (CBB_CARDEXIST & sc->sc_flags) { /* A card exists. Reset it! */
sc->sc_flags |= CBB_CARDEXIST;
if (sc->sc_flags & CBB_CARDEXIST) {
sc->sc_flags &= ~CBB_CARDEXIST;
(sc->sc_flags & CBB_CARDEXIST) == 0) {
sc->sc_flags |= CBB_CARDEXIST;