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+.\"
+.\" 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 withough 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.
+.\"
+.\"	from: npx.4,v 1.1 1993/08/06 10:58:03 cgd Exp
+.\"	$Id$
+.\"
+.Dd August 28, 1993
+.Dt NPX 4 i386
+.Os FreeBSD
+.Sh NAME
+.Nm npx
+.Nd
+Numeric Processing Extension coprocessor and emulator
+.Sh SYNOPSIS
+.Cd "options MATH_EMULATE"
+.\" XXX this is awful hackery to get it to work right... -- cgd
+.Cd "device npx0 at isa? port" \&"IO_NPX0\&" tty irq 13 vector npxintr
+.Sh DESCRIPTION
+The
+.Nm npx
+driver enables the use of the system's Numeric Processing Extension
+coprocessor,
+if one is present.  Numeric processing extensions are present in
+systems with
+.Nm 486DX
+CPUs and in systems with
+.Nm 387
+or
+.Nm 487SX
+coprocessors.  The
+.Nm npx
+driver is required for proper system functioning regardless
+of whether or not a NPX is present.
+.Pp
+If there is no NPX present in the system, the "MATH_EMULATE"
+option must be defined in the kernel configuration file.
+It will provide support for the instructions normally executed
+by the NPX.  If there is no NPX in the system and the kernel
+is not built with math emulation, the system will not boot.
+.Sh CAVEATS
+The emulator is much slower than the NPX coprocessor.
+This will result in poor floating-point math performance
+if the emulator must be used.
+.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.  If this is the case, the emulator must be used
+if consistent system operation is desired.
+.Pp
+Emulation of the transcendental functions instructions is incorrect.
+Emulation of other instructions is suspect.