JY-017 is not mapper90,281?
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There's at least 3 different PCBs for JY-017. (JY-017 最少3多种PCB).
It is probably mapper 91 + some register to select outer bank (every single game from this cart uses 91)
game
1.mapper90 working
2.mapper90 working
3.mapper?? notworking
4.mapper90 working..
rip game .