The PPC Powerbase computers were build to order machines, so could have any mixture of drives. The most common was to have an IDE hard disk and a SCSI hard drive, although at my school we had lab of PowerBase 180's that had SCSI hard drives too. I don't believe that the IDE busses on the older PowerPC logic boards hardware supported multiple IDE drives.
------------------
-Eliott Wolfe
Winnetka, Calif