feat: Added NetBSD man pages

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+.\"	$NetBSD: dmz.4,v 1.14 2017/08/01 11:11:17 wiz Exp $
+.\"
+.\" Copyright (c) 1983, 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: @(#)dmz.4	8.1 (Berkeley) 6/5/93
+.\"
+.Dd June 5, 1993
+.Dt DMZ 4 vax
+.Os
+.Sh NAME
+.Nm dmz
+.Nd
+.Tn DMZ-32
+serial terminal multiplexor
+.Sh SYNOPSIS
+.Cd "dmz0 at uba? csr 0160540" "vector dmzrinta dmzxinta dmzrintb dmzxintb dmzrintc dmzxintc"
+.Sh DESCRIPTION
+NOTE: This driver has not been ported from
+.Bx 4.4
+yet.
+.Pp
+The
+.Nm dmz
+device provides 24 lines of asynchronous serial line support.
+Modem control on all ports is available
+as an option for the H3014 distribution panel.
+.Pp
+An optional argument
+.Ar flags
+may be supplied with the device specification for
+.Nm dmz
+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 0x000004
+for
+.Li dmz0
+would cause line
+.Pa ttya2
+to be treated in this way.
+.Pp
+Normal
+.Tn I/O
+control parameters for individual lines are managed by
+.Xr ioctl 2
+calls.
+Line speeds (there are 16 choices for the
+.Tn DMZ )
+may be initiated via
+.Xr getty 8
+and
+.Xr stty 1
+or may be communicated by other programs which
+use
+.Xr ioctl 2
+such as
+.Xr ifconfig 8 ,
+see
+.Xr tty 4 .
+.Pp
+The
+.Nm dmz
+driver normally enables the input silos with a short timeout
+(30 milliseconds); this allows multiple characters to be received
+per interrupt during periods of high-speed input.
+.Sh FILES
+.Bl -tag -width /dev/tty[abcefg][0-9a-n] -compact
+.It Pa /dev/tty[abcefg][0-9a-n]
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It dmz%d: NXM line %d.
+No response from the
+.Tn UNIBUS
+on a
+.Tn DMA
+transfer
+within a timeout period.
+This is often followed by a
+.Tn UNIBUS
+adapter
+error.
+This occurs most frequently when the
+.Tn UNIBUS
+is heavily loaded
+and when devices which hog the bus (such as
+.Tn RK07 Ns s )
+are present.
+It is not serious.
+.It dmz%d: silo overflow.
+The 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 tty 4
+.Sh HISTORY
+The
+.Nm
+driver appeared in
+.Bx 4.3 .
+.Sh BUGS
+It should be possible to set the silo timeout with a configuration file option,
+as the value is a trade-off between efficiency and response time for flow
+control and character echo.