Well Ill definitely check on that thanks for the recomendationUnsure about GBA homebrew but if you don't mind spending the money I can vouch for this:
Had no issues with mine.
A better option is this thingWell Ill definitely check on that thanks for the recomendation
Interesting find - but it doesn't look complete. The receiver side doesn't do anything.Did someone say impossible? https://github.com/Lorenzooone/gba-dump-gb
Found this after a little search.