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LEARN ABOUT NETBSD

ess

ESS(4)							   BSD 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 configura-
     tion 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 chan-
     nel (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.

BSD
								   June 22, 2005							       BSD