@bloodline:
??
why dont you check the current nightly, and its softkick image?
i booted 1200/blizzard60 with aros no problems few days ago last time. not disabling anything. you just have to choose df0: as your boot device in early startup to softkick from floppy (and best have installed aros on highest priority boot partition on hd).
i have no blizzard scsi, so used internal ide, but toni assured me this work too.
the problem is with a4ks, especially csppc, this is just becoming supported, but 1200 was no problem when i first tried.