ESM(4)                  NetBSD Kernel Interfaces Manual                 ESM(4)

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 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.

SEE ALSO
     ac97(4), audio(4), joy(4), mpu(4), pci(4)

HISTORY
     The esm device driver appeared in NetBSD 1.6.

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.

NetBSD 5.0_RC4                   June 22, 2005                  NetBSD 5.0_RC4

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