NAME    [Toc]    [Back]

     harmony - CS4215/AD1849 audio interface

SYNOPSIS    [Toc]    [Back]

     harmony* at gsc? irq 13
     audio*  at harmony?

DESCRIPTION    [Toc]    [Back]

     The harmony device uses  the  Crystal  Semiconductor  CS4215
16-Bit Multimedia
 Audio Codec or Analog Devices AD1849 SoundPort(R) Stereo
Codec chip
     to implement the audio device  interface  described  in  audio(4).  This device
  is found on most HP PA-RISC workstations.  The harmony
has a maximum
     precision of 16 bits and has a stereo input and stereo  output.

     On  HP  9000/712 models harmony also provides two additional
channels for
     an add-on card with two fax/voice modems.

     One of the hardware registers reflects the state of the  CHI
bus that is
     used to communicate with the codec and thus being sampled at
a low accuracy
 secondary frequency (such as timeout(9)) produces  poor
quality random
  bit  stream  that  is fed into the entropy pool of random(4).

SEE ALSO    [Toc]    [Back]

     ioctl(2), audio(4), gsc(4), intro(4), random(4)

HISTORY    [Toc]    [Back]

     OpenBSD support for harmony first appeared in OpenBSD 3.3.

CAVEATS    [Toc]    [Back]

     To trigger entropy collection CHI bus has to  be  programmed
into the data
     mode  that  happens  once  a  single buffer of data has been
played or recorded.


OpenBSD     3.6                        January      26,      2003