1.\" $OpenBSD: zs.4,v 1.1 2001/10/08 22:37:11 miod Exp $ 2.\" 3.\" Copyright (c) 1998 The OpenBSD Project 4.\" All rights reserved. 5.\" 6.\" 7.Dd March 4, 1998 8.Dt ZS 4 sparc64 9.Os 10.Sh NAME 11.Nm zs 12.Nd Zilog 8530 (ZSCC) serial communications driver 13.Sh SYNOPSIS 14.Cd "zs* at sbus? slot ? offset ?" 15.Cd "zstty* at zs? channel ?" 16.Sh DESCRIPTION 17The 18.Nm 19is a Zilog 8530 serial interface chip used in SBus-based ULTRAsparc 20.Tn Sun 21workstations. 22The Zilog 8530 provides two input/output channels per instance. 23Most 24.Tn Sun 25workstations include two of these interfaces. 26One of the interfaces is usually hardwired for use by the keyboard and mouse 27attached to the workstation console. 28The remaining additional 29.Nm 30interfaces provide RS-423 31and RS-232 serial ports for general purpose use. 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 BUGS 45The 46.Nm 47driver now supports cua minor devices, but with this known deficiency 48in the simultaneous outgoing/incoming aspect of the driver: 49The first outgoing connection succeeds, but second and subsequent 50connections fail, apparently due to a getty hang. 51The hung getty apparently prevents the cua device from being re-opened. 52.Sh SEE ALSO 53.Xr ioctl 2 , 54.Xr kbd 4 , 55.Xr ms 4 , 56.Xr tty 4 57.Sh HISTORY 58The 59.Nm 60driver first appeared in 61.Bx 4.4 . 62Support for the TIOCM* 63.Xr ioctl 2 Ns s 64appeared in 65.Ox 2.3 . 66