struct NES_ExROM : Board {
  NES_ExROM(Markup::Node& document) : Board(document), mmc5(*this) {
    revision = Revision::ELROM;
  }

  auto main() -> void {
    mmc5.main();
  }

  auto readPRG(uint addr) -> uint8 {
    return mmc5.readPRG(addr);
  }

  auto writePRG(uint addr, uint8 data) -> void {
    mmc5.writePRG(addr, data);
  }

  auto readCHR(uint addr) -> uint8 {
    return mmc5.readCHR(addr);
  }

  auto writeCHR(uint addr, uint8 data) -> void {
    mmc5.writeCHR(addr, data);
  }

  auto scanline(uint y) -> void {
    mmc5.scanline(y);
  }

  auto power() -> void {
    mmc5.power();
  }

  auto reset() -> void {
    mmc5.reset();
  }

  auto serialize(serializer& s) -> void {
    Board::serialize(s);
    mmc5.serialize(s);
  }

  enum class Revision : uint {
    EKROM,
    ELROM,
    ETROM,
    EWROM,
  } revision;

  MMC5 mmc5;
};