Next are usefull URLs:

1)VIA 686 technical description
ftp://ftp.alsa-project.org/pub/manuals/via/686a.pdf

2)AC'97 standard
ftp://ftp.alsa-project.org/pub/manuals/general/ac97r21.pdf

3)IOPL32 library
http://hobbes.nmsu.edu/pub/os2/dev/cplusplus/iopl32.zip

4)VIA drivers
http://www.viatech.com/drivers/68MU111C.EXE

