esa(4) - NetBSD Manual Pages

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ESA(4)                  NetBSD 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 esa?
     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

     audio(4), pci(4)


HISTORY

     The esa device driver appeared in NetBSD 1.5.3.


AUTHORS

     Jared D. McNeill <jmcneill@invisible.ca>


BUGS

     Hardware volume control is not yet supported by this driver.

NetBSD 3.0.1                    January 6, 2002                   NetBSD 3.0.1