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Sources

https://oldcrap.org/2017/11/15/radio-shack-trs-81-mc-10/

http://www.colorcomputerarchive.com/coco/MC-10/Cassettes/

http://www.8bit-micro.com/data-cable.htm

http://www.trs-80.com/wordpress/trs-80-computer-line/mc-10/

http://oldcomputers.net/mc-10.html

http://mc-10.com/