245.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 245
// coded by r1
void NES_mapper245::Reset()
{
  // set CPU bank pointers
  set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);

  regs[0] = 0;
}

void NES_mapper245::MemoryWrite(uint32 addr, uint8 data)
{
  switch(addr)
  {
    case 0x8000:
      {
        regs[0] = data;
      }
      break;

    case 0x8001:
      {
        switch(regs[0] & 7)
        {
          case 0:
          case 1:
          case 2:
          case 3:
          case 4:
          case 5:
            break;

          case 6:
            {
              set_CPU_bank4(data);
            }
            break;

          case 7:
            {
              set_CPU_bank5(data);
            }
            break;
        }
      }
      break;

    case 0xA000:
      {
      }
      break;

    case 0xA001:
      {
        // write 0x80 to enable save ram ?
      }
      break;

    case 0xE000:
      {
      }
      break;
  }
}
/////////////////////////////////////////////////////////////////////

#endif