i think the function of the rom is to let the emac know that drive is bootable, and yes i did not get the option to install OS9 drivers aswell, i had to
1-drag the system folder off the os9 for prev supported emacs disc to the current OS HDD (tiger) creating the os 9 environment required to install os 9.. lol
2-click the install app located on the disc. install to the partition you want os9 on.
3-then you just drag the boot rom to the os9 installed HDD( as far as i know atleast, i havnt tried yet because i gave up awhile ago and just installed tiger on the full partition i have to partition it to try again.)
but am busy currently trying to fix a powermac g5 )= going to try asap