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The interrupt controller for the Power Mac G4 system is an MPIC cell in the KeyLargo IC. In addition to accepting all the KeyLargo internal interrupt sources, the MPIC controller accepts external interrupts from dedicated interrupt pins and serial interrupts from the Uni-N serial interrupt stream. The signals from the Uni-N IC are synchronized to the operation of the MPIC circuitry, so there is no additional interrupt latency on the Uni-N interrupts.