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Introduce an "audio and modem control for PC systems" protocol decoder
(referred to as AC'97).
This implementation extracts bits and identifies frames, and annotates
the slots of a frame with mere integer values. Bit fields get decoded
depending on the slot numbers. Bit patterns in audio/modem data slots
can get exported as binary streams.
Some TODO items remain. Register access (read/write) gets annotated, but
neither gets interpreted nor affects the decoding of subsequent frames.
The RESET# line status does not get evaluated.
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