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+.\"	$OpenBSD: ess.4,v 1.12 2022/03/31 17:27:20 naddy Exp $
+.\"	$NetBSD: ess.4,v 1.6 1999/04/13 20:25:29 augustss Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" 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.
+.\"
+.\" 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 $Mdocdate: March 31 2022 $
+.Dt ESS 4
+.Os
+.Sh NAME
+.Nm ess
+.Nd ESS Technology AudioDrive family audio device
+.Sh SYNOPSIS
+.\" .Cd "ess0   at isa? port 0x220 irq 5 drq 1 drq2 5"
+.Cd "ess*   at isapnp?"
+.\" .Cd "ess*   at ofisa?"
+.Cd "audio* at ess?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the ESS 1788, 1888, 1887, and 888 AudioDrive
+audio devices.
+.Pp
+The AudioDrive 1788 is a half-duplex device, while the 1888, 1887, and
+888 are full-duplex.
+All are capable of 8- and 16-bit audio sample recording and playback
+at rates up to 44.1kHz.
+.Pp
+The AudioDrive takes 16 I/O ports.
+The I/O port range, IRQ, and DRQ channels are set by the driver
+to the values specified in the configuration file (or for isapnp or ofisa,
+the values assigned from the firmware).
+The I/O port base must be one of 0x220, 0x230, 0x240,
+0x250.
+The IRQ must be one of 5, 7, 9, 10 (or 15 on the 1887 only).
+The first DRQ channel must be selected from 0, 1, 3.
+The second DRQ channel (used for playback by the full-duplex 1888/1887, ignored
+by the 1788) can additionally be set to 5.
+If both DRQ channels are used, they must be different.
+.Pp
+The joystick interface (if enabled) is handled by the
+.Xr joy 4
+driver.
+.Sh SEE ALSO
+.Xr audio 4 ,
+.Xr intro 4 ,
+.\" .Xr isa 4 ,
+.Xr isapnp 4 ,
+.Xr joy 4 ,
+.Xr sb 4
+.Sh HISTORY
+The
+.Nm
+device driver appeared in
+.Ox 2.2 .
+.Sh BUGS
+The AudioDrive devices have a SoundBlaster compatibility mode, and may
+be detected by the SoundBlaster driver (see
+.Xr sb 4 )
+rather than the AudioDrive driver.
+The workaround is to remove or disable the SoundBlaster driver from the kernel
+configuration.