NAME
mavb
- Moosehead A/V Board audio device
SYNOPSIS
mavb0 at mace0 offset 0x300000 intr 6
audio* at audiobus?
DESCRIPTION
The
mavb
driver provides support for the Moosehead A/V Board found on SGI
O2
machines.
The Moosehead A/V Board uses an AD1843 codec that supports 8- and
16-bit audio sample recording and playback at rates from 5 to 54 kHz,
with 1 Hz resolution.
The
mavb
driver also makes it possible to control the playback volume by using
the buttons on the front of the
O2.
SEE ALSO
audio(4),
intro(4),
mace(4)
HISTORY
The
mavb
driver first appeared in
OpenBSD3.7.
It was later ported to
NetBSD5.0.
AUTHORS
The
mavb
driver was written by Mark Kettenis, and ported to
NetBSD
by Jared D. McNeill.
CAVEATS
The analog mixer in the AD1843 codec does not provide a master volume
control.
Therefore, the
O2
volume buttons only control the output volume of the DAC.
BUGS
Currently only sample rates up to 48 kHz are supported.
Recording is not implemented yet.
The second DAC on the AD1843 codec sits idle.