918 	int mbits, obits;  in zsmctl()  local
925 	mbits = zs->zs_wreg[5] & (ZSWR5_RTS|ZSWR5_DTR);  in zsmctl()
927 	mbits |= SCC_READ0() & (ZSRR0_CD|ZSRR0_CTS);  in zsmctl()
929 	obits = mbits;  in zsmctl()
934 		mbits = bits;  in zsmctl()
938 		mbits |= bits;  in zsmctl()
942 		mbits &= ~bits;  in zsmctl()
946 		return (mbits);  in zsmctl()
955 	if (~mbits & obits & ZSWR5_DTR)  in zsmctl()
961 	if ((mbits & ~obits & ZSWR5_DTR) && (held < default_dtrlow)) {  in zsmctl()
971 	SCC_BIS(5, mbits & (ZSWR5_RTS|ZSWR5_DTR));  in zsmctl()
972 	return (mbits);  in zsmctl()