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+.\"	$NetBSD: dz.4,v 1.3 2015/05/04 07:44:18 wiz Exp $
+.\"
+.\" Copyright (c) 2010 NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This file is derived from work contributed by Microsoft Corporation.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 17, 2010
+.Dt DZ 4 emips
+.Os
+.Sh NAME
+.Nm dz
+.Nd
+.Tn eMIPS
+console serial device interface
+.Sh SYNOPSIS
+.Cd "dz* at ebus0 addr ?"
+.Sh DESCRIPTION
+This serial line provides a simple communication line with no modem control.
+It is not adequate for
+.Ux
+dialup use.
+.Pp
+Normal I/O
+control parameters for individual lines are managed by
+.Xr ioctl 2
+calls.
+Line speeds may be initiated via
+the
+.Xr ttys 5
+file,
+.Xr stty 1
+or
+.Xr ifconfig 8
+to name a few,
+see
+.Xr tty 4 .
+.Pp
+The
+.Nm dz
+driver monitors the rate of input on each board,
+and switches between the use of character-at-a-time interrupts
+and input silos.
+While the silo is enabled during periods of high-speed input,
+the driver polls for input 30 times per second.
+.Sh FILES
+.Bl -tag -width /dev/tty[0-9][0-9]xx -compact
+.It Pa /dev/ttyD0
+phys interface.
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It dz%d: silo overflow .
+The 1 character input silo overflowed before it could be serviced.
+This can happen if a hard error occurs when the
+.Tn CPU
+is running with elevated priority, as the system will
+then print a message on the console with interrupts disabled.
+It is not serious.
+.El
+.Sh SEE ALSO
+.Xr stty 1 ,
+.Xr tty 4 ,
+.Xr ttys 5 ,
+.Xr getty 8
+.Sh HISTORY
+A
+.Nm
+driver appeared in
+.Nx 6.0 .