This is a comprehensive vintage User Manual for Fathom Technologies Tape Backup Units, specifically covering Models 120, 240, 300, and 1000. This essential guide provides detailed information for operating the Fathom Systems' Tape Backup Unit, designed for use with IBM System/36 and compatible systems. It's a valuable piece of retro computing history for collectors and enthusiasts of vintage computer hardware and software documentation.The manual is presented in a durable binder format, offering in-depth instructions for installation, operation, troubleshooting, and maintenance of the tape backup unit. It includes sections on system operations, creating backup procedures, restoring data, and error codes. The content reflects the technology and practices of data management from the early 1990s, making it a fascinating artifact for anyone interested in vintage IBM computing and data storage solutions. A handwritten label on the front cover indicates "Quarter Deck TAPE (TQ) Error Codes."Included items: One (1) Fathom Technologies Tape Backup Unit User Manual in a binder format.