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 OpenBSD 3.7. It was later ported to NetBSD 5.0.

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.