I've managed to get OS 9.2.2 running, however, when I add the <-device usb-audio> argument to enable audio playback, the virtual machine will only run for around a minute, after which every window in the virtual machine will close and I'll only be able to move the mouse around, not being able to interact with any GUI element at all.
Has anyone else encountered this problem or does anyone have a solution for it? I'm only using OS 9.2.2 to access old music production software, so audio is a must.
The host machine is a 2014 MacBook Pro running OSX 10.15.3 Catalina. I downloaded QEMU 6.1.0 through Homebrew. This is my boot command:
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qemu-system-ppc -L pc-bios -cpu g4 -M mac99,via=pmu,usb=on -m 1024 -hda macos92.img -boot c -g 1024x768x32 -device usb-kbd -device usb-mouse -device usb-audio