ESS(4)                    OpenBSD Programmer's Manual                   ESS(4)

NAME
     ess - ESS Technology AudioDrive family audio device driver

SYNOPSIS
     ess*   at isapnp?
     audio* at ess?

DESCRIPTION
     The ess driver provides support for the ESS 1788, 1888, 1887, and 888 Au-
     dioDrive 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 chan-
     nels are set by the driver to the vaues specified in the configuration
     file (or for isapnp 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.

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

SEE ALSO
     audio(4), isa(4), isapnp(4), joy(4)

HISTORY
     The ess device driver appeared in OpenBSD 2.2.


OpenBSD 2.9                     August 5, 1999                               1
