Can't you just remove the "Zero Slot RAID" card and use the on-board SCSI controller? The Intel RAID card was never supported under Solaris, but the on-board SCSI was (well, I am 97.234% sure it ran Solaris as it was originally shipped).
You can either use a third-party "one slot" RAID controller OR soft-RAID... Ken -- This message posted from opensolaris.org