.\" $NetBSD: opl.4,v 1.21 2009/01/03 18:27:19 wiz Exp $
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Lennart Augustsson.
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.Dd January 3, 2009
.Dt OPL 4
.Os
.Sh NAME
.Nm opl
.Nd Yamaha OPL2 and OPL3 FM MIDI synthesizer driver
.Sh SYNOPSIS
.Cd "opl*  at cmpci? flags 1"
.Cd "opl*  at eso?"
.Cd "opl*  at ess?"
.Cd "opl*  at fms?"
.Cd "opl0  at isa? port 0x388"
.Cd "opl*  at sb?"
.Cd "opl*  at sv?"
.Cd "opl*  at wss?"
.Cd "opl*  at yds?"
.Cd "opl*  at ym?"
.Cd "midi* at opl?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the Yamaha OPL2 (YM3812) and OPL3
(YMF262) chips.
The chips are FM synthesizers and are capable
of producing a wide range of sounds.
.Pp
Access to the device is through the MIDI driver.
.Pp
The
.Nm
driver usually attaches to a sound card, but it can also sit
directly on the ISA bus.
.Pp
If
.Dq flags 1
is specified, the
.Nm
driver handles left and right channels of OPL3 swapped.
Use this flag if your device has such problem.
.Sh SEE ALSO
.Xr cmpci 4 ,
.Xr eso 4 ,
.Xr ess 4 ,
.Xr fms 4 ,
.Xr isa 4 ,
.Xr midi 4 ,
.Xr sb 4 ,
.Xr sv 4 ,
.Xr wss 4 ,
.Xr yds 4 ,
.Xr ym 4
.Sh HISTORY
The
.Nm
device driver appeared in
.Nx 1.4 .
.Sh BUGS
The OPL3 chip is operated in OPL2 mode despite being more capable.