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In the Readme you mentioned that you rip the games yourself - what hardware do you use for that?

I can also recommend the GBCart shield - https://www.tindie.com/products/insidegadgets/gameboy-cart-s.... I've got the newer reader listed on the site but haven't had a chance to test it yet.

If you need a hand dumping games, let me know.

It's mentioned in the build section in the Readme - the Joey Generation 3.