feat: Added NetBSD man pages

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+.\"	$NetBSD: ad.4,v 1.12 2017/07/03 21:30:59 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: @(#)ad.4	8.1 (Berkeley) 6/5/93
+.\"
+.Dd June 5, 1993
+.Dt AD 4 vax
+.Os
+.Sh NAME
+.Nm ad
+.Nd Data Translation A/D converter
+.Sh SYNOPSIS
+.Cd "ad0 at uba0 csr 0170400 vector adintr"
+.Sh DESCRIPTION
+NOTE: This driver has not been ported from
+.Bx 4.4
+yet.
+.Pp
+The
+.Nm \&ad
+driver
+provides an interface to the Data Translation A/D converter.
+This is
+.Em not
+a real-time driver, but merely allows
+the user process to sample the board's channels one at a time.
+Each minor device selects a different
+.Tn A/D
+board.
+.Pp
+The driver communicates to a user process by means of
+.Xr ioctl 2 Ns s .
+The
+.Dv AD_CHAN
+.Xr ioctl 2
+selects which channel of the board to read.
+For example,
+.Bd -literal -offset indent
+chan = 5;
+ioctl(fd, AD_CHAN, &chan);
+.Ed
+.Pp
+selects channel 5.
+The
+.Dv AD_READ
+.Xr ioctl 2
+actually reads the data and returns it to the user
+process.
+An example is
+.Bd -literal -offset indent
+ioctl(fd, AD_READ, &data);
+.Ed
+.Sh FILES
+.Bl -tag -width /dev/adx -compact
+.It Pa /dev/ad
+.El
+.Sh DIAGNOSTICS
+None.
+.Sh HISTORY
+The
+.Nm
+driver appeared in
+.Bx 4.1 .