TX_OFF
scc_key_trx(scc, TX_OFF);
scc_key_trx(scc, TX_OFF);
if (arg != TX_OFF) {
if (arg == TX_OFF)
scc_key_trx(scc, TX_OFF);
if (yp->magic != YAM_MAGIC || yp->tx_state != TX_OFF ||
case TX_OFF:
yp->tx_state = TX_OFF;
yp->tx_state = TX_OFF;