ESM(4) Kernel Interfaces Manual ESM(4)
esm -- ESS Technology Maestro 2/2E PCI Audio Accelerator audio device
esm* at pci? dev ? function ?
audio* at audiobus?
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
ac97(4), audio(4), joy(4), mpu(4), pci(4)
The esm device driver appeared in NetBSD 1.6.
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.
NetBSD 6.1.5 June 22, 2005 NetBSD 6.1.5