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+.\"	$NetBSD: dz.4,v 1.9 2017/08/01 11:04:21 wiz Exp $
+.\"
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" 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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
+.\"
+.\"     from: @(#)dz.4	8.1 (Berkeley) 6/5/93
+.\"
+.Dd June 5, 1993
+.Dt DZ 4 vax
+.Os
+.Sh NAME
+.Nm dz
+.Nd
+.Tn DZ-11
+serial multiplexer device interface
+.Sh SYNOPSIS
+.Cd "dz0 at uba0 csr 0160100 vector dzrint dzxint"
+.Sh DESCRIPTION
+A
+.Tn DZ-11
+provides 8 communication lines with partial modem control,
+adequate for
+.Ux
+dialup use.
+.Pp
+An optional argument
+.Ar flags
+may be supplied with the device specification
+in the config file indicating
+that the line corresponding to
+bit number
+.Ar i
+is not properly
+connected, and should be treated as hard-wired with carrier
+always present.
+Thus specifying
+.Ql flags 0x04
+for
+.Li dz0
+would cause line
+.Pa tty02
+to be treated in this way.
+.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/tty[0-9][0-9]
+.It Pa /dev/ttyd[0-9a-f]
+dialups
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It dz%d: silo overflow .
+The 64 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
+.At 32v .