NAME    [Toc]    [Back]

     ess - ESS Technology AudioDrive family audio device driver

SYNOPSIS    [Toc]    [Back]

     ess*   at isapnp?
     audio* at ess?

DESCRIPTION    [Toc]    [Back]

     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 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    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     The ess device driver appeared in OpenBSD 2.2.

BUGS    [Toc]    [Back]

     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  or  disable  the
SoundBlaster
     driver from the kernel configuration.

OpenBSD      3.6                          August      5,     1999