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+.\" $NetBSD: ppi.4,v 1.4 2004/01/23 19:36:23 wiz Exp $
+.\"
+.\" Copyright (c) 1997
+.\"      Michael Smith
+.\"
+.\" 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 as
+.\"    the first lines of this file unmodified.
+.\" 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.
+.\"
+.\" $FreeBSD: src/share/man/man4/ppi.4,v 1.4.2.7 2001/12/17 11:30:12 ru Exp $
+.\"
+.Dd December 29, 2003
+.Dt PPI 4
+.Os
+.Sh NAME
+.Nm ppi
+.Nd "user-space interface to ppbus parallel port"
+.Sh SYNOPSIS
+.Cd "ppi* at ppbus?"
+.Pp
+Minor numbering:  Unit numbers correspond directly to
+.Xr ppbus 4
+numbers.
+.Sh DESCRIPTION
+The
+.Nm
+driver provides a convenient means for user applications to manipulate
+the state of the parallel port, enabling easy low-speed I/O operations
+without the security problems inherent with the use of the
+.Pa /dev/io
+interface.
+.Pp
+The programming interface is described in
+.Xr ppi 9 .
+.Sh SEE ALSO
+.Xr atppc 4 ,
+.Xr io 4 ,
+.Xr ppbus 4 ,
+.Xr ppi 9
+.Sh HISTORY
+.Nm
+originally appeared in
+.Fx .
+.Sh AUTHORS
+This manual page is based on the
+.Fx
+.Nm ppi
+manual page and was updated for the
+.Nx
+port by
+.An Gary Thorpe .
+.Sh BUGS
+The inverse sense of signals is confusing.
+.Pp
+The
+.Fn ioctl
+interface is slow, and there is no way (yet) to chain multiple
+operations together.
+.Pp
+The headers required for user applications are not installed as
+part of the standard system.