ESM(4) NetBSD Kernel Interfaces Manual ESM(4)
esm -- ESS Technology Maestro 2/2E PCI Audio Accelerator audio device driver
esm* at pci? dev ? function ? audio* at audiobus?
The esm device driver supports sound cards based on ESS Technology Mae- stro, 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 proces- sor is capable of handling and converting 8 and 16 bit mono and stereo data.
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 9.0 June 22, 2005 NetBSD 9.0
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