The Via VT82C686A "super southbridge" chips contain AC97-compatible audio logic which features dual 16-bit stereo PCM sound channels (full duplex), plus a third PCM channel intended for use in hardware-assisted FM synthesis.
The current Linux kernel audio driver for this family of chips supports audio playback and recording, but hardware-assisted FM features, and hardware buffer direct-access (mmap) support are not yet available.
This driver supports any Linux kernel version after 2.4.10.
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