https://www.commodorespain.es/alargador-cable-datassette/
Alargador cable Datassette | Commodore Spain
May 28, 2017 - Cable alargador para extender el puerto del cassete fuera del Commodore 64, Commodore Vic 20, Commodore Pet, Commodore 128.
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https://archive.mith.umd.edu/vintage-computers/items/show/84/index.html
MITH's Vintage Computers | Commodore 1530 Datassette
A database of MITH's vintage computing equipment.
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https://computersmuseum.com/technical/manuals/commodore-manuals/1531-datassette-user-guide/
1531 Datassette User Guide - Vintage Computer Club Malta
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