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Tiger (10.4) broke the kext Mac-On-Linux required and the port was never updated. I hastily hacked in a CoreAudio HAL output driver (complete with multithreading!) into Mac-On-Linux that somehow managed to work (I had zero OS X programming experience at the time). The sound output did require some work on my part. Sound and graphics worked great unlike under Classic where the sound output frequently broke up. I managed to get it working and much to my surprise Bernie ran much better. I took a keen interest in it as my Aluminum Powerbook G4 could not natively run MacOS 9 and I had a program (Bernie ][ The Rescue, an Apple IIgs emulator) that wouldn't run properly in Classic. Back in 2004 or so there was a short lived alpha quality port of the Mac-On-Linux virtual machine to Darwin platforms.
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