They do make adaptors , I've never seen a PSR-9000 but I'm assuming the SCSI on it is the standard 25pin SCSI . You would have to go to a computer store to get the adaptor . The only problem I forsee is that SCSI is a faster data transfer than USB . I don't know if that will create a problem or not , perhaps the bottlenecking of data is handled by the adaptor . Another choice is to look for a used SCSI zip drive , Harmony Central.com , and EMULATORARCHIVE.com are great places to find things like that .