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snow leopard with virtual box on osx high Sierra - boot options

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hello, I hope this is the right place. 

I want to run snow leopard in a virtual machine so I can run some powerpc software. I'm using my own snow leopard installer from years ago. 


apparently adding -v cpus=1 busratio=20 boot options stops the installer from hanging at AppleIntelCPUManagement. (screen shot 1)

I can't for the life of me get to this prompt !


Nearest I can get is what looks like the VM's boot menu (see screen shot 2) by holding function-f8, s, v, and n  at start up.


Help would be enormously appreciated. 


Thanks in advance  



Screen Shot 1.png

Screen Shot 2.png

hi and thanks for your reply.

however, the problem I am having is how to get to the command line in the first place. keystrokes either take me to the boot screen in screenshot 2 or are ignored and verbose booting happens until the hang. 

I'm on a Mac Pro 5,1 running 10.13.6. 

any ideas ?

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