185.cpp

PocketNester的c++源代码,很好的学习例子,仅供大家学习

#ifdef _NES_MAPPER_CPP_

/////////////////////////////////////////////////////////////////////
// Mapper 185
void NES_mapper185::Reset()
{
  // set CPU bank pointers
  set_CPU_banks(0,1,2,3);

  patch = 0;

  if(parent_NES->crc32() == 0xb36457c7) // Spy Vs Spy
  {
    patch = 1;
  }

  for(uint32 i = 0; i < 0x400; i++)
  {
    dummy_chr_rom[i] = 0xFF;
  }
}

void NES_mapper185::MemoryWrite(uint32 addr, uint8 data)
{
  if((!patch && (data & 0x03)) || (patch && data == 0x21))
  {
    set_PPU_banks(0,1,2,3,4,5,6,7);
  }
  else
  {
    parent_NES->ppu->PPU_VRAM_banks[0] = dummy_chr_rom;
    parent_NES->ppu->PPU_VRAM_banks[1] = dummy_chr_rom;
    parent_NES->ppu->PPU_VRAM_banks[2] = dummy_chr_rom;
    parent_NES->ppu->PPU_VRAM_banks[3] = dummy_chr_rom;
    parent_NES->ppu->PPU_VRAM_banks[4] = dummy_chr_rom;
    parent_NES->ppu->PPU_VRAM_banks[5] = dummy_chr_rom;
    parent_NES->ppu->PPU_VRAM_banks[6] = dummy_chr_rom;
    parent_NES->ppu->PPU_VRAM_banks[7] = dummy_chr_rom;
  }
}
/////////////////////////////////////////////////////////////////////

#endif