.\"	$OpenBSD: sb.4,v 1.12 2006/09/21 13:20:27 jmc Exp $
.\"	$NetBSD: sb.4,v 1.13 1997/10/31 15:02:33 augustss Exp $
.\"
.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by John T. Kohl.
.\"
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.\" modification, are permitted provided that the following conditions
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.\"    must display the following acknowledgement:
.\"        This product includes software developed by the NetBSD
.\"        Foundation, Inc. and its contributors.
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.\"    contributors may be used to endorse or promote products derived
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.Dd November 4, 1995
.Dt SB 4 i386
.Os
.Sh NAME
.Nm sb
.Nd SoundBlaster family audio device
.Sh SYNOPSIS
.Cd "sb0 at isa? port 0x220 irq 5 drq 1"
.Cd "sb1 at isa? port 0x240 irq 7 drq 1 flags 1"
.Cd "sb* at isapnp?"
.Cd "audio* at sb?"
.Cd "midi* at sb?" Pq "MPU401 port"
.Cd "opl* at sb?"
.Sh DESCRIPTION
The
.Nm
driver supports the
SoundBlaster 16, Jazz 16, SoundBlaster AWE 32, SoundBlaster AWE 64,
and hardware register-level compatible audio cards.
.Pp
The SoundBlaster series are half-duplex cards, capable of 8- and 16-bit
audio sample recording and playback at rates up to 44.1kHz (depending on
the particular model).
.Pp
The base I/O port address is usually jumper-selected to either 0x220 or
0x240 (newer cards may provide software configuration, but this driver
does not directly support them--you must configure the card for its I/O
addresses with other software).
The SoundBlaster takes 16 I/O ports.
For the SoundBlaster and SoundBlaster Pro, the IRQ and DRQ channels are
jumper-selected.
For the SoundBlaster 16, the IRQ and DRQ channels are set by this driver
to the values specified in the config file.
The IRQ must be selected from the set {5,7,9,10}.
.Pp
The configuration file must set the value of
.Cm flags
to 1 to enable the Jazz16 support.
This is to avoid potential conflicts with other devices when probing the
Jazz 16 because it requires use of extra I/O ports not in the base port range.
.Pp
The joystick interface (if enabled by a jumper) is handled by the
.Xr joy 4
driver, and the optional SCSI CD-ROM interface is handled by the
.Xr aic 4
driver.
.Sh SEE ALSO
.Xr aic 4 ,
.Xr audio 4 ,
.Xr intro 4 ,
.Xr isa 4 ,
.Xr isapnp 4 ,
.Xr joy 4 ,
.Xr midi 4 ,
.Xr opl 4 ,
.Xr wss 4
.Sh HISTORY
The
.Nm
device driver appeared in
.Nx 1.0 .
.Sh BUGS
With a SoundBlaster 16 card the device is full duplex, but it can
only sensibly handle a precision of 8 bits.
It does so by extending
the output 8 bit samples to 16 bits and using the 8 bit DMA channel
for input and the 16 bit channel for output.
.Pp
The non-SCSI CD-ROM interfaces found on some older cards are not supported.