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ESS(4)                     Kernel Interfaces Manual                     ESS(4)

NAME
     ess -- ESS Technology AudioDrive family audio device driver

SYNOPSIS
     ess*   at isapnp?
     ess*   at pnpbios? index ?
     ess*   at ofisa?
     audio* at audiobus?
     opl*   at ess?

DESCRIPTION
     The ess driver provides support for the ESS 1788, 1888, 1887, and 888
     AudioDrive audio devices.

     The AudioDrive 1788 is a half-duplex device, while the 1888, 1887, and
     888 are full-duplex. All are capable of 8- and 16-bit audio sample
     recording and playback at rates up to 44.1kHz.

     The AudioDrive takes 16 I/O ports. The I/O port range, IRQ, and DRQ
     channels are set by the driver to the values specified in the
     configuration file (or for isapnp, pnpbios, or ofisa, the values assigned
     from the firmware).  The I/O port base must be one of 0x220, 0x230,
     0x240, 0x250. The IRQ must be one of 5, 7, 9, 10 (or 15 on the 1887
     only). The first DRQ channel must be selected from 0, 1, 3. The second
     DRQ channel (used for playback by the full-duplex 1888/1887, ignored by
     the 1788) can additionally be set to 5. If both DRQ channels are used
     they must be different.

     The joystick interface (if enabled) is handled by the joy(4) driver.

SEE ALSO
     audio(4), isapnp(4), joy(4), ofisa(4), opl(4), pnpbios(4)

HISTORY
     The ess device driver appeared in NetBSD 1.4.

BUGS
     The AudioDrive devices have a SoundBlaster compatibility mode, and may be
     detected by the SoundBlaster driver (see sb(4)) rather than the
     AudioDrive driver. The workaround is to remove the SoundBlaster driver
     from the kernel configuration.

NetBSD 6.1.5                     June 22, 2005                    NetBSD 6.1.5