File:9-track-drive-open.jpg - Wikimedia Commons
IBM 3420 9-track tape drives arrrive for restoration. 800 lbs each! - YouTube
Debugging the 1959 IBM 729 Vacuum Column Tape Drive at the Computer History Museum - YouTube
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MagTapeMedia.html
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Ken Shirriff on Twitter: "We finally fixed the 1960's IBM mag tape drive @ComputerHistory. Slack tape is held in vacuum columns, with pressure switches to sense the tape position. After probing resistor-transistor
Repairing the card reader for a 1960s mainframe: cams, relays and a clutch
IBM 729 - Wikipedia
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9 Track Tape | Encyclopedia MDPI
FACOM 603 Magnetic Tape Unit-Computer Museum
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IBM 729 - Wikipedia
9-track tape - Wikipedia
