1.\" $OpenBSD: npx.4,v 1.15 2007/06/20 14:11:33 jmc Exp $ 2.\" 3.\" Copyright (c) 1993 Christopher G. Demetriou 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by Christopher G. Demetriou. 17.\" 3. The name of the author may not be used to endorse or promote products 18.\" derived from this software without specific prior written permission 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30.\" 31.Dd $Mdocdate: June 20 2007 $ 32.Dt NPX 4 i386 33.Os 34.Sh NAME 35.Nm npx 36.Nd Numeric Processing Extension coprocessor and emulator 37.Sh SYNOPSIS 38.\" XXX this is awful hackery to get it to work right... -- cgd 39.Cd "npx0 at isa? port" \&"IO_NPX0\&" irq 13 40.Sh DESCRIPTION 41The 42.Nm 43driver enables the use of the system's Numeric Processing Extension 44coprocessor, 45if one is present. 46Numeric processing extensions are present in systems with 47.Tn 486DX 48CPUs and in systems with 49.Tn 387 50or 51.Tn 487SX 52coprocessors. 53The 54.Nm 55driver is required for proper system functioning regardless 56of whether or not an NPX is present. 57.Sh SEE ALSO 58.Xr intro 4 , 59.Xr isa 4 60.Sh BUGS 61There are lots of them, especially on cheap motherboards. 62In particular, some motherboards do not have the interrupt lines from the NPX 63to the CPU wired properly. 64