1.\" $OpenBSD: zs.4,v 1.5 2003/06/06 10:29:42 jmc Exp $ 2.\" 3.\" Copyright (c) 1998 The OpenBSD Project 4.\" All rights reserved. 5.\" 6.\" 7.Dd October 1, 2001 8.Dt ZS 4 macppc 9.Os 10.Sh NAME 11.Nm zs 12.Nd Zilog 8530 (ZSCC) serial communications driver 13.Sh SYNOPSIS 14.Cd "zsc* at macobio?" 15.Cd "zstty* at zsc? channel ?" 16.Sh DESCRIPTION 17The 18.Nm 19is a Zilog 8530 serial interface chip used in 20.Tn Sun 21workstations and 22.Tn Apple 23Macintosh systems. 24On most newer Macintosh systems, the first port 25tty00 26is connected to the internal modem. 27The second port is either not connected, or may be connected to 28an IRDA device (untested). 29It is possible to replace the internal modem on some system with 30a real serial port using third party hardware adapters. 31.Pp 32The 33.Nm 34driver supports all of the standard 35.Xr tty 4 36ioctl calls. 37The status of the DTR, RTS, CTS, and DCD signals can be queried with 38TIOCMGET command, but, due to limitations in the hardware, 39only the DTR and RTS signals can be modified with TIOCMSET, TIOCMBIC, 40and TIOCMBIS 41.Xr ioctl 2 42commands. 43.Sh FILES 44.Bl -tag -width Pa -compact 45.It Pa /dev/tty00 46.It Pa /dev/tty01 47.It Pa /dev/cua00 48.It Pa /dev/cua01 49.El 50.Sh SEE ALSO 51.Xr ioctl 2 , 52.Xr intro 4 , 53.Xr tty 4 54.Sh HISTORY 55The 56.Nm 57driver first appeared in 58.Bx 4.4 . 59Support for the TIOCM* 60.Xr ioctl 2 Ns s 61appeared in 62.Ox 2.3 . 63.Sh BUGS 64The 65.Nm 66driver now supports cua minor devices, but with this known deficiency 67in the simultaneous outgoing/incoming aspect of the driver: 68The first outgoing connection succeeds, but second and subsequent 69connections fail, apparently due to a getty hang. 70The hung getty apparently prevents the cua device from being re-opened. 71