NES 2.0 Mapper 517

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NES 2.0 Mapper 517 is used for 까치와 노래친구 (Kkachi-wa Nolae Chingu), a Korean Karaoke game. It uses banking similar to UNROM without bus conflicts, but has additional ADC hardware (different from NES 2.0 Mapper 515) for its custom microphone socket at $6000 and $6001.