This is an addendum to my post to Ross. The CDU-541 as far as I can tell
now has a true SCSI bus interface and as such requires a true SCSI adapter.
The 6201/7205 use the Sony Hi-Speed Serial Bus, which is a modified SCSI
bus adapter. Transplantation of the 541 into a 6201/7205 case will not be
possible without changing over the 40 pin ribbon cable back panel connector
to a 50 pin ribbon cable/connector. Then you still have the requirement of
providing a SCSI adapter card. You would be better off getting the
CDU-7211 external version of the 541 from the start.