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+.\"	$OpenBSD: npx.4,v 1.15 2007/06/20 14:11:33 jmc Exp $
+.\"
+.\" Copyright (c) 1993 Christopher G. Demetriou
+.\" 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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"      This product includes software developed by Christopher G. Demetriou.
+.\" 3. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" 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 $Mdocdate: June 20 2007 $
+.Dt NPX 4 i386
+.Os
+.Sh NAME
+.Nm npx
+.Nd Numeric Processing Extension coprocessor and emulator
+.Sh SYNOPSIS
+.\" XXX this is awful hackery to get it to work right... -- cgd
+.Cd "npx0 at isa? port" \&"IO_NPX0\&" irq 13
+.Sh DESCRIPTION
+The
+.Nm
+driver enables the use of the system's Numeric Processing Extension
+coprocessor,
+if one is present.
+Numeric processing extensions are present in systems with
+.Tn 486DX
+CPUs and in systems with
+.Tn 387
+or
+.Tn 487SX
+coprocessors.
+The
+.Nm
+driver is required for proper system functioning regardless
+of whether or not an NPX is present.
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr isa 4
+.Sh BUGS
+There are lots of them, especially on cheap motherboards.
+In particular, some motherboards do not have the interrupt lines from the NPX
+to the CPU wired properly.