CS4215/AD1849 audio device
harmony* at gsc? irq 13
audio* at 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
. This device is found on
most HP PA-RISC workstations. The harmony
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
support for harmony
first appeared in OpenBSD 3.3
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.