ESA(4) | Device Drivers 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 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>

May 13, 2008 | NetBSD 9.2