ESA(4) Kernel Interfaces Manual ESA(4)
NAME
esaESS 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 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
HISTORY
The esa device driver appeared in NetBSD 1.5.3.
AUTHORS
Jared D. McNeill <jmcneill@invisible.ca>