NAME
esm
- ESS Technology Maestro 2/2E PCI Audio Accelerator audio device driver
SYNOPSIS
esm* at pci? dev ? function ?
audio* at audiobus?
DESCRIPTION
The
esm
device driver supports sound cards based on ESS Technology Maestro,
Maestro-2, and Maestro-2E PCI AC97 Audio Accelerator chips (ES1968 and ES1978).
Due to their power management capabilities, the Maestro chips are often used
in laptop and notebook systems.
The Maestro is a full-duplex device that allows independent playback and
recording at sample rates between 4000 Hz and 48 kHz.
The sound processor is capable of handling and converting 8 and 16 bit mono
and stereo data.
SEE ALSO
ac97(4),
audio(4),
joy(4),
mpu(4),
pci(4)
HISTORY
The
esm
device driver appeared in
NetBSD1.6.
BUGS
Currently, this driver only supports 16-bit mono recording; an unknown bug
causes stereo recording to miss a channel.
Also not supported yet are hardware volume settings, MIDI, and joystick input.