440 lines
9.0 KiB
C#
440 lines
9.0 KiB
C#
using System;
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using BizHawk.Common.NumberExtensions;
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using BizHawk.Common.BufferExtensions;
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using BizHawk.Emulation.Common;
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using BizHawk.Emulation.Cores.Components.M6502;
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namespace BizHawk.Emulation.Cores.Atari.Atari2600
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{
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public partial class Atari2600
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{
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private readonly GameInfo _game;
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private TIA _tia;
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private M6532 _m6532;
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private DCFilter _dcfilter;
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private MapperBase _mapper;
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private byte[] _ram;
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private IController _controller;
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private int _frame;
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private int _lastAddress;
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private bool _leftDifficultySwitchPressed;
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private bool _rightDifficultySwitchPressed;
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private bool _leftDifficultySwitchHeld;
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private bool _rightDifficultySwitchHeld;
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internal MOS6502X Cpu { get; private set; }
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internal byte[] Ram => _ram;
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internal byte[] Rom { get; }
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internal int DistinctAccessCount { get; private set; }
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// keeps track of tia cycles, 3 cycles per CPU cycle
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private int cyc_counter;
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private static MapperBase SetMultiCartMapper(int romLength, int gameTotal)
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{
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switch (romLength / gameTotal)
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{
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case 1024 * 2: // 2K
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return new Multicart2K(gameTotal);
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default:
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case 1024 * 4: // 4K
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return new Multicart4K(gameTotal);
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case 1024 * 8: // 8K
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return new Multicart8K(gameTotal);
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}
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}
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internal byte BaseReadMemory(ushort addr)
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{
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addr = (ushort)(addr & 0x1FFF);
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if ((addr & 0x1080) == 0)
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{
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return _tia.ReadMemory(addr, false);
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}
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if ((addr & 0x1080) == 0x0080)
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{
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_tia.BusState = _m6532.ReadMemory(addr, false);
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return _m6532.ReadMemory(addr, false);
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}
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_tia.BusState = Rom[addr & 0x0FFF];
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return Rom[addr & 0x0FFF];
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}
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internal byte BasePeekMemory(ushort addr)
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{
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addr = (ushort)(addr & 0x1FFF);
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if ((addr & 0x1080) == 0)
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{
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return _tia.ReadMemory(addr, true);
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}
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if ((addr & 0x1080) == 0x0080)
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{
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return _m6532.ReadMemory(addr, true);
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}
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return Rom[addr & 0x0FFF];
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}
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internal void BaseWriteMemory(ushort addr, byte value)
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{
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_tia.BusState = value;
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if (addr != _lastAddress)
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{
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DistinctAccessCount++;
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_lastAddress = addr;
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}
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addr = (ushort)(addr & 0x1FFF);
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if ((addr & 0x1080) == 0)
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{
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_tia.WriteMemory(addr, value, false);
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}
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else if ((addr & 0x1080) == 0x0080)
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{
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_m6532.WriteMemory(addr, value);
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}
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else
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{
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Console.WriteLine("ROM write(?): " + addr.ToString("x"));
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}
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}
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internal void BasePokeMemory(ushort addr, byte value)
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{
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addr = (ushort)(addr & 0x1FFF);
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if ((addr & 0x1080) == 0)
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{
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_tia.WriteMemory(addr, value, true);
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}
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else if ((addr & 0x1080) == 0x0080)
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{
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_m6532.WriteMemory(addr, value);
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}
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else
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{
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Console.WriteLine("ROM write(?): " + addr.ToString("x"));
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}
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}
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private byte ReadMemory(ushort addr)
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{
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if (addr != _lastAddress)
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{
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DistinctAccessCount++;
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_lastAddress = addr;
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}
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_mapper.Bit13 = addr.Bit(13);
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var temp = _mapper.ReadMemory((ushort)(addr & 0x1FFF));
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_tia.BusState = temp;
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MemoryCallbacks.CallReads(addr, "System Bus");
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return temp;
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}
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private byte PeekMemory(ushort addr)
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{
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var temp = _mapper.PeekMemory((ushort)(addr & 0x1FFF));
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return temp;
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}
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private void WriteMemory(ushort addr, byte value)
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{
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if (addr != _lastAddress)
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{
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DistinctAccessCount++;
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_lastAddress = addr;
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}
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_mapper.WriteMemory((ushort)(addr & 0x1FFF), value);
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MemoryCallbacks.CallWrites(addr, "System Bus");
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}
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internal void PokeMemory(ushort addr, byte value)
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{
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_mapper.PokeMemory((ushort)(addr & 0x1FFF), value);
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}
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private void ExecFetch(ushort addr)
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{
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MemoryCallbacks.CallExecutes(addr, "System Bus");
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}
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private void RebootCore()
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{
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// Regenerate mapper here to make sure its state is entirely clean
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switch (_game.GetOptionsDict()["m"])
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{
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case "2IN1":
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_mapper = SetMultiCartMapper(Rom.Length, 2);
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break;
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case "4IN1":
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_mapper = SetMultiCartMapper(Rom.Length, 4);
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break;
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case "8IN1":
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_mapper = SetMultiCartMapper(Rom.Length, 8);
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break;
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case "16IN1":
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_mapper = SetMultiCartMapper(Rom.Length, 16);
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break;
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case "32IN1":
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_mapper = SetMultiCartMapper(Rom.Length, 32);
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break;
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case "AR":
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_mapper = new mAR(this); // This mapper has to set up configurations in the contructor.
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break;
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case "4K":
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_mapper = new m4K();
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break;
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case "2K":
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_mapper = new m2K();
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break;
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case "CM":
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_mapper = new mCM();
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break;
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case "CV":
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_mapper = new mCV();
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break;
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case "DPC":
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_mapper = new mDPC();
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break;
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case "DPC+":
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_mapper = new mDPCPlus();
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break;
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case "F8":
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_mapper = new mF8();
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break;
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case "F8SC":
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_mapper = new mF8SC();
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break;
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case "F6":
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_mapper = new mF6();
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break;
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case "F6SC":
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_mapper = new mF6SC();
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break;
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case "F4":
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_mapper = new mF4();
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break;
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case "F4SC":
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_mapper = new mF4SC();
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break;
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case "FE":
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_mapper = new mFE();
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break;
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case "E0":
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_mapper = new mE0();
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break;
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case "3F":
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_mapper = new m3F();
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break;
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case "FA":
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_mapper = new mFA();
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break;
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case "FA2":
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_mapper = new mFA2();
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break;
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case "E7":
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_mapper = new mE7();
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break;
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case "F0":
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_mapper = new mF0();
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break;
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case "UA":
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_mapper = new mUA();
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break;
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// Special Sega Mapper which has swapped banks
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case "F8_sega":
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_mapper = new mF8_sega();
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break;
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// Homebrew mappers
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case "3E":
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_mapper = new m3E();
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break;
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case "0840":
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_mapper = new m0840();
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break;
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case "MC":
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_mapper = new mMC();
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break;
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case "EF":
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_mapper = new mEF();
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break;
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case "EFSC":
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_mapper = new mEFSC();
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break;
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case "X07":
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_mapper = new mX07();
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break;
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case "4A50":
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_mapper = new m4A50();
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break;
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case "SB":
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_mapper = new mSB();
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break;
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default:
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throw new InvalidOperationException("mapper not supported: " + _game.GetOptionsDict()["m"]);
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}
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_mapper.Core = this;
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_lagcount = 0;
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Cpu = new MOS6502X
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{
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ReadMemory = ReadMemory,
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WriteMemory = WriteMemory,
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PeekMemory = PeekMemory,
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DummyReadMemory = ReadMemory,
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OnExecFetch = ExecFetch
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};
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if (_game["PAL"])
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{
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_pal = true;
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}
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else if (_game["NTSC"])
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{
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_pal = false;
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}
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else
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{
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_pal = DetectPal(_game, Rom);
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}
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// dcfilter coefficent is from real observed hardware behavior: a latched "1" will fully decay by ~170 or so tia sound cycles
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_tia = new TIA(this, _pal, Settings.SECAMColors);
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_dcfilter = new DCFilter(_tia, 256);
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_m6532 = new M6532(this);
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HardReset();
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// Show mapper class on romstatusdetails
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CoreComm.RomStatusDetails = $"{this._game.Name}\r\nSHA1:{Rom.HashSHA1()}\r\nMD5:{Rom.HashMD5()}\r\nMapper Impl \"{_mapper.GetType()}\"";
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}
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private bool _pal;
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private void HardReset()
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{
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_ram = new byte[128];
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_mapper.HardReset();
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Cpu = new MOS6502X
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{
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ReadMemory = ReadMemory,
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WriteMemory = WriteMemory,
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PeekMemory = PeekMemory,
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DummyReadMemory = ReadMemory,
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OnExecFetch = ExecFetch
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};
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_tia.Reset();
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_m6532 = new M6532(this);
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SetupMemoryDomains();
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cyc_counter = 0;
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}
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private void Cycle()
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{
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_tia.Execute();
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cyc_counter++;
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if (cyc_counter == 3)
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{
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_m6532.Timer.Tick();
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if (Tracer.Enabled)
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{
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Tracer.Put(Cpu.TraceState());
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}
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Cpu.ExecuteOne();
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_mapper.ClockCpu();
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cyc_counter = 0;
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}
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}
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internal byte ReadControls1(bool peek)
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{
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InputCallbacks.Call();
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byte value = _controllerDeck.ReadPort1(_controller);
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if (!peek)
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{
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_islag = false;
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}
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return value;
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}
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internal byte ReadControls2(bool peek)
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{
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InputCallbacks.Call();
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byte value = _controllerDeck.ReadPort2(_controller);
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if (!peek)
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{
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_islag = false;
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}
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return value;
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}
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internal int ReadPot1(int pot)
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{
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int value = _controllerDeck.ReadPot1(_controller, pot);
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return value;
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}
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internal int ReadPot2(int pot)
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{
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int value = _controllerDeck.ReadPot2(_controller, pot);
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return value;
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}
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internal byte ReadConsoleSwitches(bool peek)
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{
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byte value = 0xFF;
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bool select = _controller.IsPressed("Select");
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bool reset = _controller.IsPressed("Reset");
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if (reset) { value &= 0xFE; }
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if (select) { value &= 0xFD; }
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if (SyncSettings.BW) { value &= 0xF7; }
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if (_leftDifficultySwitchPressed)
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{
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value &= 0xBF;
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}
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if (_rightDifficultySwitchPressed)
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{
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value &= 0x7F;
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}
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if (!peek)
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{
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_islag = false;
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}
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return value;
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}
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}
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}
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