I tried on 7.5 on my powermac and 7.1 on my IIci. 7.5 works fine.

I just thought about something. Can a mac IIci use two scsi buses at once? The only thing i havent mentionned is that I boot from my onboard scsi while the card is on. I'm going to try it only with a drive on the SEIV. Atto never mentionned in their manuals that you could use both buses. The only instructions are for using the same drive with the Silicon Express IV.