ALLOC_INT
if (smc_read_1(sc, IST) & ALLOC_INT) {
smc_write_1(sc, ACK, ALLOC_INT);
sc->smc_mask |= ALLOC_INT;
if (status & ALLOC_INT) {
smc_write_1(sc, ACK, ALLOC_INT);
sc->smc_mask &= ~ALLOC_INT;