MAVB(4) | Device Drivers Manual (sgimips) | MAVB(4)

# 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), sgimips/intro(4), sgimips/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.

February 17, 2017 | NetBSD 11.0