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ESM(4)                       Device Drivers 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
     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 9.99                      June 22, 2005                     NetBSD 9.99