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MAVB(4) Device Drivers Manual (sgi) MAVB(4)

mavbMoosehead A/V Board audio device

mavb0 at macebus0
audio* at mavb?

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.

audio(4), intro(4), macebus(4)

The mavb driver first appeared in OpenBSD 3.7.

The mavb driver was written by Mark Kettenis.

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.

Currently only sample rates up to 48 kHz are supported. The second DAC on the AD1843 codec sits idle.

January 15, 2015 OpenBSD-6.1