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ESA(4)			 BSD Kernel Interfaces Manual			ESA(4)

NAME
     esa — ESS Technology Allegro-1 / Maestro-3 family audio device driver

SYNOPSIS
     esa*   at pci? dev ? function ?
     audio* at audiobus?
     options ESA_NUM_VOICES=4

DESCRIPTION
     The esa driver provides support for the ESS Allegro-1 and Maestro-3 audio
     devices on the PCI bus.  These devices are popular in laptop systems.

     The Allegro-1 and the Maestro-3 are full-duplex devices that allow inde‐
     pendent playback and recording at sample rates between 8000Hz and 48000Hz
     and are capable of playback at 8 and 16 bit in mono and stereo.

     Setting options ESA_NUM_VOICES=4 allows for hardware mixing in the device
     driver.  Note that due to microcode constraints, the esa driver is cur‐
     rently limited to 4 simultaneous voices.

SEE ALSO
     ac97(4), audio(4), pci(4)

HISTORY
     The esa device driver appeared in NetBSD 1.5.3.

AUTHORS
     Jared D. McNeill ⟨jmcneill@invisible.ca⟩

BSD				 May 13, 2008				   BSD

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