The SCSI adapter determines the driver type based on the drive select number to which the drive responds. I don't recall which drive select maps to which drive, but if it comes up wrong try a different drive select. Depending on the version of the hardware you have, the adapter may deal with RX23 (3.5" 1.44MB), RX33 (5.25" 1.2MB), and RX26 (3.5" 2.88MB) drives. It will adjust the model number it reports to the host depending on the drive attached and it determines which drive is attached by the drive select to which the drive responds. Another variation between models is whether or not the firmware hides the RX50 software interleave used by PDP-11 and VAX systems (DECmates and Rainbows used a different software interleave). IIRC, the firmware version with knows about the RX50 software interleave identifies itself as 5.7. For the life of me, I don't recall whether the RX50 software interleave is tied to the drive type or whether it assumes the floppy is an RX50 if it discovers that it's 10 sectors per track, 80 tracks, 250KHz data rate (the controller is pretty flexible and tries really hard to adjust itself to the format of the diskette inserted, although it does assume the whole world uses 512 byte sectors). -- Roger Ivie rivie(a)teraglobal.com Not speaking for TeraGlobal Communications Corporation