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Differences compared to Mockingboard: . TIMER1 underflows to $FFFE before it's reloaded with latch. . TIMER1's LATCH=$0000 gets interpreted as $FFFF. . Partial TIMER2 support: IFR.T2 gets set on underflow. But T2 reads as 0x00FF. . AY register reads are unsupported (always read as 0). Config->Sound: show 'MEGA Audio' in drop-down menus only if it was specified on the cmd line.