0ace4398df
to parse by an automated script (say one that just might want to generate webpage summaries of available drivers :)
95 lines
4.1 KiB
Groff
95 lines
4.1 KiB
Groff
.\" $NetBSD: gus.4,v 1.9 1999/12/15 22:07:32 abs Exp $
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.\"
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.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by John T. Kohl.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd November 4, 1995
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.Dt GUS 4
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.Os
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.Sh NAME
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.Nm gus
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.Nd
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Gravis UltraSound/UltraSound MAX audio device driver
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.Sh SYNOPSIS
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.Cd "gus0 at isa? port 0xPPP irq X drq Y drq2 Z"
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.Cd "audio* at gus?"
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.Sh DESCRIPTION
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The
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.Nm gus
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driver provides support for the Gravis UltraSound (GUS) and GUS MAX
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audio cards. Both cards have on-board memory which is used for
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seamless playback of samples. They can play back 8- or 16-bit samples
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at up to 44.1kHz. They can record 8-bit samples at up to 44.1kHz.
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The UltraSound MAX is a full-duplex sound device, and if
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configured with two DRQ channels can be used for simultaneous playback
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and recording. The I/O port base is jumper-selected, and may be chosen
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from 0x210-0x260 in steps of 0x10. (The normal setting is 0x220.) The
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GUS takes 16 ports at its base address and 8 ports at its base address +
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0x100.
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.Pp
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The IRQ is software programmed, so you may select any IRQ from the set
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{3,5,7,9,11,12,15}. The DRQ lines are software programmed, and may be
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chosen from {1,3,5,6,7}. The drq2 field in the configuration file line
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specifies a second DRQ line for recording. If there is no drq2 field
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in the config file, the playback channel will be used for recording DMA
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and only half-duplex mode will be available.
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.Pp
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The Gravis UltraSound MAX has an additional CODEC onboard which is
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addressed with four ports at an offset of 0x10C from the base ports
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(0x31C-0x36C).
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.Sh BUGS
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The full-duplex features of the GUS MAX have not been fully tested, and
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full-duplex on the original GUS may not be possible at all.
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.Pp
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Only two voices on the GF1 synthesizer chip are used by this driver (for
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left and right channels).
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.Pp
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Manipulating the mixer while audio samples are playing can lead to
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device driver confusion (and maybe even a system panic).
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.Pp
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Manipulating the mixer device seems to create pregnant system pauses,
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probably due to excessive interrupt masking.
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.Pp
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The joystick and MIDI port interfaces are not supported.
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.Sh SEE ALSO
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.Xr audio 4
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.Sh REFERENCES
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Gravis UltraSound Low-Level Toolkit, Revision 2.01, 20 May 1993,
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published by Advanced Gravis and Forte Technologies.
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.Sh HISTORY
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The
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.Nm gus
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device driver appeared in
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.Nx 1.1 .
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