Well I just confirmed my suspicions by hooking the m4 (9903) drive up to it's original system (a General Automation Zebra 2820). The MK2 SCSI board in the M4 data drive is "faulty", the controllers don't see it. I hate to go in search of a new 1/2 SCSI tape drive as they are pretty expensive. My M4 is (comparatively) light, and was little used and in gorgeous condition. So, what are the chances someone may have a "256K MK2 SCSI" board for an M4 Data 9903 tape drive? Or know where I might find/buy one? Thanks :\ Jay West