I was able to install from sdC1 in the Bochs emulator. If you install and your CD is not sdD0, you get this prompt:
Unknown boot device: sdD0!cdboot!9pcflop.gz Boot device: fd0 boot from: If its sdC1 (like in my case), the answer has to be: boot from: sdC1!cdboot!9pcflop.gz More info about the install at http://plan9.bell-labs.com/wiki/plan9/installation_instructions/
