You might double check that. I also have a rev A G3 (bought the 266 G3/AV MT model brand new in 1997). It shipped with a 6GB IDE hard drive, ATAPI CD-ROM drive (different IDE channels, both masters), and SCSI zip drive. Some server and BTO models shipped with an ATTO or other re-branded SCSI card and a fast (for the time) Ultra2 SCSI hard drive, but ALL G3 models boot from IDE/ATAPI master devices just fine unless they are suffering from a hardware defect.
Peace,
Drew