public NesSystem(IHostGraphics hostGraphics)
{
_clock = new Clock();
_cpuBus = new Bus();
// CPU
_cpu = new CPU(_cpuBus.MasterClient);
_clock.AddSink(_cpu);
// 片上 RAM
_cpuOnChipRAM = new OnChipRAM(OnChipRAMSize);
_clock.AddSink(_cpuOnChipRAM);
// APU
_apu = new APU();
// PPU
_ppuBus = new Bus();
_ppu = new PPU(_ppuBus, _cpu, hostGraphics);
_clock.Add3TimesSink(_ppu);
_nametableMirrorController = new NametableMirrorController();
// 板卡
Cartridge = new Cartridge(_nametableMirrorController);
SetupCPUMemoryMap();
SetupPPUMemoryMap();
}
private void SetupPPUMemoryMap()
{
_ppuBus.AddSlave(0x0000, Cartridge.ChrRom);
_ppuBus.AddSlave(0x2000, _nametableMirrorController);
_ppuBus.AddSlave(0x3000, _nametableMirrorController, memoryMapSize: 0xF00);
var paletteRAM = new OnChipRAM(0x20);
for (ushort i = 0x3F00; i < 0x3FFF; i += 0x20)
{
_ppuBus.AddSlave(i, paletteRAM);
}
}