I've got one here, I've had for years- the SCSI ability is just an option. They all have the SCSI ports (internal(?) and external)- but for the SCSI, a chip needs to be at the back of the RocTek motherboard- if there's a big socket with no chip in at the back, yours is like mine, and has no SCSI support.
Note: this is what I've worked out- the manual isn't very helpful on the SCSI option. :/
