008.cpp

来自「PocketNester的c++源代码,很好的学习例子,仅供大家学习」· C++ 代码 · 共 39 行

/////////////////////////////////////////////////////////////////////
// Mapper 8
void NES_mapper8::Reset()
{
  // set CPU bank pointers
  set_CPU_banks(0,1,2,3);

  // set PPU bank pointers
  set_PPU_banks(0,1,2,3,4,5,6,7);

  /*
  if(parent_NES->crc32() == 0xe30552db) // Paris-Dakar Rally Special
  {
    parent_NES->frame_irq_disenabled = 1;
  }
  */
}

void NES_mapper8::MemoryWrite(uint32 addr, uint8 data)
{
  uint8 prg_bank = (data & 0xF8) >> 3;
  uint8 chr_bank = data & 0x07;
  
  set_CPU_bank4(prg_bank*2+0);
  set_CPU_bank5(prg_bank*2+1);

  set_PPU_bank0(chr_bank*8+0);
  set_PPU_bank1(chr_bank*8+1);
  set_PPU_bank2(chr_bank*8+2);
  set_PPU_bank3(chr_bank*8+3);
  set_PPU_bank4(chr_bank*8+4);
  set_PPU_bank5(chr_bank*8+5);
  set_PPU_bank6(chr_bank*8+6);
  set_PPU_bank7(chr_bank*8+7);
}
/////////////////////////////////////////////////////////////////////