Bootup selection with old Supermico P6DLF

Hi. I'm haveing a very fustrating time getting the above board to boot
off of a Adaptec AAA-133U2 Array controller and a pci Ide card. Ive
tried two: One a maxtor ata133, the other a no-name brand. No matter
what pci slot the scsi or ide controller is plugged into, the ide
controller's bios comes up first, and is selected as the boot device.
Ive tried every option i can think of in the motherboard bios to no
avail. I was able to get the IDE bios not to respond at all at boot
time by selecting the pci slot under "offboard pci slot" under the
system bios, however this results in a re-boot upon booting (Gentoo
Universal LiveCd) Whenever a harddrive is plugged into the offboard
IDE controller, its bios kicks in and it tries to boot off the ide HD
instead of the Scsi Array. If no OS is found on the IDE HD, it simply
freezes instead of trying the scsi card

Any help?