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+.\" $NetBSD: eap.4,v 1.20 2024/05/16 17:00:31 nia Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Lennart Augustsson.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd May 16, 2024
+.Dt EAP 4
+.Os
+.Sh NAME
+.Nm eap
+.Nd AudioPCI audio device driver
+.Sh SYNOPSIS
+.Cd "eap*    at pci? dev ? function ?"
+.Cd "options EAP_USE_BOTH_DACS"
+.Pp
+.Cd "audio*  at audiobus?"
+.Cd "joy*    at eap?"
+.Cd "midi*   at eap?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the Ensoniq AudioPCI and Creative Labs
+SoundBlaster PCI series of audio cards.
+All models based on the ES1370, ES1371, and ES1373 chips are supported.
+.Pp
+By specifying:
+.Pp
+.D1 Cd options EAP_USE_BOTH_DACS
+.Pp
+a second audio device is attached.
+This can be used for audio output simultaneously with the primary DAC.
+You can use it simply by directing audio output to the additional
+.Pa /dev/audioX
+device associated with it.
+.Sh SEE ALSO
+.Xr ac97 4 ,
+.Xr audio 4 ,
+.Xr joy 4 ,
+.Xr midi 4 ,
+.Xr pci 4
+.Sh HISTORY
+The
+.Nm
+device driver appeared in
+.Nx 1.4 .
+.Sh CAVEATS
+The joystick port hardware works by emulating a legacy
+.Xr isa 4
+joystick port, bypassing the
+.Xr pci 4
+bus method for address allocation.
+This is unlikely to work on PCI busses other than the primary one.
+There is also a possibility for conflicts with real ISA devices
+because the PCI bus is probed before ISA.
+Use with caution.
+.Pp
+The
+.Dv EAP_USE_BOTH_DACS
+option is rather redundant after the introduction of the in-kernel audio
+mixer, and may be removed in a future release.
+It is possible that it could be used to accelerate mixing streams by
+taking advantage of the hardware's features, but currently the
+additional (small) overhead of the kernel mixer is impossible to bypass,
+since
+.Nx
+no longer allows userspace software to write directly to audio hardware.
+The
+.Nm
+hardware only features one clock, so generally the second audio device
+must be configured in the same way as the first.