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
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 ALSOaudio(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
AudioDrive driver. The workaround is to remove or disable the
SoundBlaster driver from the kernel configuration.
OpenBSD 4.9 June 26, 2008 OpenBSD 4.9
