1.\" $OpenBSD: zs.4,v 1.8 2015/11/23 10:37:20 mpi Exp $ 2.\" 3.\" Copyright (c) 1998 The OpenBSD Project 4.\" All rights reserved. 5.\" 6.\" 7.Dd $Mdocdate: November 23 2015 $ 8.Dt ZS 4 macppc 9.Os 10.Sh NAME 11.Nm zs , 12.Nm zstty 13.Nd Zilog 8530 (ZSCC) serial communications driver 14.Sh SYNOPSIS 15.Cd "zs* at macobio?" 16.Cd "zstty* at zs?" 17.Sh DESCRIPTION 18The 19.Nm 20is a Zilog 8530 serial interface chip used in 21.Tn Sun 22workstations and 23.Tn Apple 24Macintosh systems. 25On most newer Macintosh systems, the first port 26tty00 27is connected to the internal modem. 28The second port is either not connected, or may be connected to 29an IRDA device (untested). 30It is possible to replace the internal modem on some system with 31a real serial port using third party hardware adapters. 32.Pp 33The 34.Nm 35driver supports all of the standard 36.Xr tty 4 37ioctl calls. 38The status of the DTR, RTS, CTS, and DCD signals can be queried with 39TIOCMGET command, but, due to limitations in the hardware, 40only the DTR and RTS signals can be modified with TIOCMSET, TIOCMBIC, 41and TIOCMBIS 42.Xr ioctl 2 43commands. 44.Sh FILES 45.Bl -tag -width Pa -compact 46.It Pa /dev/tty00 47.It Pa /dev/tty01 48.It Pa /dev/cua00 49.It Pa /dev/cua01 50.El 51.Sh SEE ALSO 52.Xr ioctl 2 , 53.Xr intro 4 , 54.Xr tty 4 55.Sh HISTORY 56The 57.Nm 58driver first appeared in 59.Bx 4.4 . 60Support for the TIOCM* 61.Xr ioctl 2 Ns s 62appeared in 63.Ox 2.3 . 64.Sh BUGS 65The 66.Nm 67driver now supports cua minor devices, but with this known deficiency 68in the simultaneous outgoing/incoming aspect of the driver: 69The first outgoing connection succeeds, but second and subsequent 70connections fail, apparently due to a getty hang. 71The hung getty apparently prevents the cua device from being re-opened. 72