netbsd man page for esa

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 sys-
     tems.

     The Allegro-1 and the Maestro-3 are full-duplex devices that allow independent 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
     currently 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