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

NAME
     ess - ESS Technology AudioDrive family audio device

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
     channels are set by the driver to the values specified in the configura-
     tion 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 addi-
     tionally be set to 5.  If both DRQ channels are used they must be differ-
     ent.

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

SEE ALSO
     audio(4), intro(4), isapnp(4), joy(4), sb(4)

HISTORY
     The ess device driver appeared in OpenBSD 2.2.

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 or disable the SoundBlaster
     driver from the kernel configuration.

OpenBSD 4.7                      June 26, 2008                               1
