Here is my video on how to dump a Commodore 64 cartridge using the free software called: mdump from http://markus.brenner.de/cartridge/
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httpvh://www.youtube.com/watch?v=9Tnsg3kZkYU
Excellent video, I used to rip several Drean Commodore cartridges that I have with games in Spanish to add to gb64 that I think are not, thanks