I'm confused by the AC'97 on board sound and modem thing:
Even after reading the  article:
http://www.microsoft.com/hwdev/audio/AMR.htm
ftp://download.intel.com/ial/scalableplatforms/ichx_ac97audio1_0.pdf
This all began with reading about the VIA KT133A.
http://www.viatech.com/jsp/en/products/apollo/kt133a.jsp

I still wonder about several things: (probably more if I really understood
the questions)

1. Does a sound card only add extra channels with AC'97 is on board?
2. if AMR is on the chip then where does the phone line plug in?
3. What questions do you ask/answer to decide to use onboard or new
hardware?
4. What is different about  S/PDIF (Sony/Philips Digital Interface) and how
is that used with AC97?
5. Is the short slot for a add-in audio card that plugs into a stereo
system?

It seems that the more I read the less I understand. Is there a simple
version of the AC97 explanation with only what you need to know without all
the details?
Thanks
Raymond Ryel

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