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 audio(4)
device is found on most HP PA-RISC workstations. The
has a maximum precision of 16 bits
and has a stereo input and stereo output.
On HP 9000/712 models
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
first appeared in
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.