C_CH_DISABLE      431 dev/pci/cz.c   		CZTTY_CHAN_WRITE(sc, CHNCTL_OP_MODE, C_CH_DISABLE);
C_CH_DISABLE      931 dev/pci/cz.c   	CZTTY_CHAN_WRITE(sc, CHNCTL_OP_MODE, C_CH_DISABLE);