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> Power Mac G4 Developer Note
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The Power Mac G4 computer has new sound circuitry, called Tumbler, that is connected to the KeyLargo IC by a standard I2 S bus. The KeyLargo IC provides DB-DMA (descriptor-based direct memory access) support for the I2 S port.
The sound circuitry includes a signal processing IC that handles the equalization and volume control functions, a codec IC that performs A-to-D and D-to-A conversion, and a digital power amplifier that drives the Apple speaker mini-jack.
All audio is handled digitally inside the computer. The Tumbler circuitry performs digital-to-analog conversion for the audio signals to the internal speaker and the headphone jack.
For a description of the features of the sound system, see Sound System.