Well, I think that you will have a SCSI interface. To check if that is true, go to Disk > Load and look for the option 'SCSI'. It should be under Floppy and Hard Disk. If it is 'gray', you don't have SCSI. If it is the same font as Floppy and Hard Disk, you can be certain that SCSI is installed and working.
Note that when plugging a SCSI device, you must restart the instrument.