Commodore64: Removed a lot of unnecessary function chains and converted unsigned types to int.

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -99,7 +99,6 @@
     <Compile Include="Computers\Commodore64\Disk\VIC1541.cs" />
     <Compile Include="Computers\Commodore64\Disk\VIC1541.PLA.cs" />
     <Compile Include="Computers\Commodore64\Media\PRG.cs" />
-    <Compile Include="Computers\Commodore64\Memory.cs" />
     <Compile Include="Computers\Commodore64\Cartridge\Cart.cs" />
     <Compile Include="Computers\Commodore64\MOS\CartridgePort.cs" />
     <Compile Include="Computers\Commodore64\MOS\CassettePort.cs" />

BizHawk.Emulation/Computers/Commodore64/C64.Core.cs

@@ -106,7 +106,7 @@ namespace BizHawk.Emulation.Computers.Commodore64
 
 	static public class C64Util
 	{
-		static public string ToBinary(uint n, uint charsmin)
+		static public string ToBinary(int n, int charsmin)
 		{
 			string result = "";
 
@@ -121,13 +121,13 @@ namespace BizHawk.Emulation.Computers.Commodore64
 			return result;
 		}
 
-		static public string ToHex(uint n, uint charsmin)
+		static public string ToHex(int n, int charsmin)
 		{
 			string result = "";
 
 			while (n > 0 || charsmin > 0)
 			{
-				result = "0123456789ABCDEF".Substring((int)(n & 0xF), 1) + result;
+				result = "0123456789ABCDEF".Substring((n & 0xF), 1) + result;
 				n >>= 4;
 				if (charsmin > 0)
 					charsmin--;

BizHawk.Emulation/Computers/Commodore64/C64.Input.cs

@@ -61,9 +61,9 @@ namespace BizHawk.Emulation.Computers.Commodore64
 			byte joyA = 0xFF;
 			byte joyB = 0xFF;
 
-			for (uint i = 0; i < 8; i++)
+			for (int i = 0; i < 8; i++)
 			{
-				for (uint j = 0; j < 8; j++)
+				for (int j = 0; j < 8; j++)
 				{
 					if (keyboardPressed[i, j])
 					{
@@ -76,7 +76,7 @@ namespace BizHawk.Emulation.Computers.Commodore64
 				}
 			}
 
-			for (uint i = 0; i < 5; i++)
+			for (int i = 0; i < 5; i++)
 			{
 				if (joystickPressed[1, i])
 					joyA &= inputBitMask[i];
@@ -89,6 +89,9 @@ namespace BizHawk.Emulation.Computers.Commodore64
 
             cia0InputLatchA = resultA;
 			cia0InputLatchB = resultB;
+
+            // this joystick has special rules.
+            cia0.PortAMask = joyA;
 		}
 	}
 }

BizHawk.Emulation/Computers/Commodore64/C64.Motherboard.cs

@@ -2,6 +2,9 @@
 
 namespace BizHawk.Emulation.Computers.Commodore64
 {
+    /// <summary>
+    /// Contains the onboard chipset and glue.
+    /// </summary>
 	public partial class Motherboard
 	{
 		// chips
@@ -25,9 +28,11 @@ namespace BizHawk.Emulation.Computers.Commodore64
 		public UserPort userPort;
 
 		// state
-		public ushort address;
+		public int address;
 		public byte bus;
 		public bool inputRead;
+        public bool irq;
+        public bool nmi;
 
 		public Motherboard(Region initRegion)
 		{
@@ -92,25 +97,32 @@ namespace BizHawk.Emulation.Computers.Commodore64
 
 		public void Init()
 		{
-            cassPort.ReadDataOutput = CassPort_DeviceReadLevel;
+            cartPort.ReadIRQ = Glue_ReadIRQ;
-            cassPort.ReadMotor = CassPort_DeviceReadMotor;
+            cartPort.ReadNMI = cia1.ReadIRQBuffer;
 
-            cia0.ReadFlag = Cia0_ReadFlag;
+            cassPort.ReadDataOutput = CassPort_ReadDataOutput;
+            cassPort.ReadMotor = CassPort_ReadMotor;
+
+            cia0.ReadCNT = Cia0_ReadCnt;
+            cia0.ReadFlag = cassPort.ReadDataInputBuffer;
 			cia0.ReadPortA = Cia0_ReadPortA;
 			cia0.ReadPortB = Cia0_ReadPortB;
+            cia0.ReadSP = Cia0_ReadSP;
 
-            cia1.ReadFlag = Cia1_ReadFlag;
+            cia1.ReadCNT = Cia1_ReadCnt;
+            cia1.ReadFlag = userPort.ReadFlag2;
             cia1.ReadPortA = Cia1_ReadPortA;
-			cia1.ReadPortB = Cia1_ReadPortB;
+			cia1.ReadPortB = userPort.ReadData;
+            cia1.ReadSP = Cia1_ReadSP;
 
 			cpu.PeekMemory = pla.Peek;
 			cpu.PokeMemory = pla.Poke;
-            cpu.ReadAEC = vic.ReadAEC;
+            cpu.ReadAEC = vic.ReadAECBuffer;
-            cpu.ReadIRQ = Cpu_ReadIRQ;
+            cpu.ReadIRQ = Glue_ReadIRQ;
-			cpu.ReadNMI = cia1.ReadIRQ;
+            cpu.ReadNMI = cia1.ReadIRQBuffer;
             cpu.ReadPort = Cpu_ReadPort;
-			cpu.ReadRDY = vic.ReadBA;
+            cpu.ReadRDY = vic.ReadBABuffer;
-			cpu.ReadMemory = pla.Read;
+			cpu.ReadMemory = pla.Read; 
 			cpu.WriteMemory = pla.Write;
 
 			pla.PeekBasicRom = basicRom.Peek;
@@ -136,8 +148,8 @@ namespace BizHawk.Emulation.Computers.Commodore64
 			pla.PokeMemory = ram.Poke;
 			pla.PokeSid = sid.Poke;
 			pla.PokeVic = vic.Poke;
-            pla.ReadAEC = vic.ReadAEC;
+            pla.ReadAEC = vic.ReadAECBuffer;
-            pla.ReadBA = vic.ReadBA;
+            pla.ReadBA = vic.ReadBABuffer;
             pla.ReadBasicRom = Pla_ReadBasicRom;
             pla.ReadCartridgeHi = Pla_ReadCartridgeHi;
             pla.ReadCartridgeLo = Pla_ReadCartridgeLo;
@@ -167,21 +179,15 @@ namespace BizHawk.Emulation.Computers.Commodore64
             pla.WriteSid = Pla_WriteSid;
             pla.WriteVic = Pla_WriteVic;
 
-			// note: c64 serport lines are inverted
+            serPort.ReadAtnOut = SerPort_ReadAtnOut;
-            serPort.DeviceReadAtn = SerPort_DeviceReadAtn;
+            serPort.ReadClockOut = SerPort_ReadClockOut;
-            serPort.DeviceReadClock = SerPort_DeviceReadClock;
+            serPort.ReadDataOut = SerPort_ReadDataOut;
-            serPort.DeviceReadData = SerPort_DeviceReadData;
-            serPort.DeviceReadReset = SerPort_DeviceReadReset;
-            serPort.DeviceWriteAtn = SerPort_DeviceWriteAtn;
-            serPort.DeviceWriteClock = SerPort_DeviceWriteClock;
-            serPort.DeviceWriteData = SerPort_DeviceWriteData;
-            serPort.DeviceWriteSrq = SerPort_DeviceWriteSrq;
 
             sid.ReadPotX = Sid_ReadPotX;
             sid.ReadPotY = Sid_ReadPotY;
 
             vic.ReadMemory = Vic_ReadMemory;
-            vic.ReadColorRam = Vic_ReadColorRam;
+            vic.ReadColorRam = colorRam.Read;
 		}
 
 		public void SyncState(Serializer ser)

BizHawk.Emulation/Computers/Commodore64/C64.MotherboardInterface.cs

@@ -9,19 +9,21 @@ namespace BizHawk.Emulation.Computers.Commodore64
 {
     public partial class Motherboard
     {
-        bool CassPort_DeviceReadLevel()
+
+
+        bool CassPort_ReadDataOutput()
         {
             return (cpu.PortData & 0x08) != 0;
         }
 
-        bool CassPort_DeviceReadMotor()
+        bool CassPort_ReadMotor()
         {
             return (cpu.PortData & 0x20) != 0;
         }
 
-        bool Cia0_ReadFlag()
+        bool Cia0_ReadCnt()
         {
-            return cassPort.DataInput;
+            return (userPort.ReadCounter1Buffer() && cia0.ReadCNTBuffer());
         }
 
         byte Cia0_ReadPortA()
@@ -36,55 +38,60 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return cia0InputLatchB;
         }
 
-        bool Cia1_ReadFlag()
+        bool Cia0_ReadSP()
         {
-            return true;
+            return (userPort.ReadSerial1Buffer() && cia0.ReadSPBuffer());
+        }
+
+        bool Cia1_ReadCnt()
+        {
+            return (userPort.ReadCounter2Buffer() && cia1.ReadCNTBuffer());
         }
 
         byte Cia1_ReadPortA()
         {
             // the low bits are actually the VIC memory address.
-            return 0x3F;
+            byte result = 0xFF;
+            if (serPort.WriteDataIn())
+                result &= 0x7F;
+            if (serPort.WriteClockIn())
+                result &= 0xBF;
+            return result;
         }
 
-        byte Cia1_ReadPortB()
+        bool Cia1_ReadSP()
         {
-            return 0xFF;
+            return (userPort.ReadSerial2Buffer() && cia1.ReadSPBuffer());
-        }
-
-        bool Cpu_ReadCassetteButton()
-        {
-            return true;
-        }
-
-        bool Cpu_ReadIRQ()
-        {
-            return cia0.IRQ & vic.IRQ & cartPort.IRQ;
         }
 
         byte Cpu_ReadPort()
         {
             byte data = 0x1F;
-            if (!cassPort.Sense)
+            if (!cassPort.ReadSenseBuffer())
                 data &= 0xEF;
             return data;
         }
 
-        byte Pla_ReadBasicRom(ushort addr)
+        bool Glue_ReadIRQ()
+        {
+            return cia0.ReadIRQBuffer() & vic.ReadIRQBuffer() & cartPort.ReadIRQBuffer();
+        }
+
+        byte Pla_ReadBasicRom(int addr)
         {
             address = addr; 
             bus = basicRom.Read(addr); 
             return bus;
         }
 
-        byte Pla_ReadCartridgeHi(ushort addr)
+        byte Pla_ReadCartridgeHi(int addr)
         {
             address = addr;
             bus = cartPort.ReadHiRom(addr);
             return bus;
         }
 
-        byte Pla_ReadCartridgeLo(ushort addr)
+        byte Pla_ReadCartridgeLo(int addr)
         {
             address = addr; 
             bus = cartPort.ReadLoRom(addr); 
@@ -96,14 +103,14 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return (cpu.PortData & 0x04) != 0;
         }
 
-        byte Pla_ReadCharRom(ushort addr)
+        byte Pla_ReadCharRom(int addr)
         {
             address = addr; 
             bus = charRom.Read(addr); 
             return bus;
         }
 
-        byte Pla_ReadCia0(ushort addr)
+        byte Pla_ReadCia0(int addr)
         {
             address = addr;
             bus = cia0.Read(addr);
@@ -112,14 +119,14 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return bus;
         }
 
-        byte Pla_ReadCia1(ushort addr)
+        byte Pla_ReadCia1(int addr)
         {
             address = addr; 
             bus = cia1.Read(addr); 
             return bus;
         }
 
-        byte Pla_ReadColorRam(ushort addr)
+        byte Pla_ReadColorRam(int addr)
         {
             address = addr;
             bus &= 0xF0;
@@ -127,14 +134,14 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return bus;
         }
 
-        byte Pla_ReadExpansionHi(ushort addr)
+        byte Pla_ReadExpansionHi(int addr)
         {
             address = addr;
             bus = cartPort.ReadHiExp(addr);
             return bus;
         }
 
-        byte Pla_ReadExpansionLo(ushort addr)
+        byte Pla_ReadExpansionLo(int addr)
         {
             address = addr;
             bus = cartPort.ReadLoExp(addr);
@@ -146,7 +153,7 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return (cpu.PortData & 0x02) != 0;
         }
 
-        byte Pla_ReadKernalRom(ushort addr)
+        byte Pla_ReadKernalRom(int addr)
         {
             address = addr;
             bus = kernalRom.Read(addr);
@@ -158,139 +165,112 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return (cpu.PortData & 0x01) != 0;
         }
 
-        byte Pla_ReadMemory(ushort addr)
+        byte Pla_ReadMemory(int addr)
         {
             address = addr;
             bus = ram.Read(addr);
             return bus;
         }
 
-        byte Pla_ReadSid(ushort addr)
+        byte Pla_ReadSid(int addr)
         {
             address = addr;
             bus = sid.Read(addr);
             return bus;
         }
 
-        byte Pla_ReadVic(ushort addr)
+        byte Pla_ReadVic(int addr)
         {
             address = addr;
             bus = vic.Read(addr);
             return bus;
         }
 
-        void Pla_WriteCartridgeHi(ushort addr, byte val)
+        void Pla_WriteCartridgeHi(int addr, byte val)
         {
             address = addr;
             bus = val;
             cartPort.WriteHiRom(addr, val);
         }
 
-        void Pla_WriteCartridgeLo(ushort addr, byte val)
+        void Pla_WriteCartridgeLo(int addr, byte val)
         {
             address = addr;
             bus = val;
             cartPort.WriteLoRom(addr, val);
         }
 
-        void Pla_WriteCia0(ushort addr, byte val)
+        void Pla_WriteCia0(int addr, byte val)
         {
             address = addr;
             bus = val;
             cia0.Write(addr, val);
         }
 
-        void Pla_WriteCia1(ushort addr, byte val)
+        void Pla_WriteCia1(int addr, byte val)
         {
             address = addr;
             bus = val;
             cia1.Write(addr, val);
         }
 
-        void Pla_WriteColorRam(ushort addr, byte val)
+        void Pla_WriteColorRam(int addr, byte val)
         {
             address = addr;
             bus = val;
             colorRam.Write(addr, val);
         }
 
-        void Pla_WriteExpansionHi(ushort addr, byte val)
+        void Pla_WriteExpansionHi(int addr, byte val)
         {
             address = addr;
             bus = val;
             cartPort.WriteHiExp(addr, val);
         }
 
-        void Pla_WriteExpansionLo(ushort addr, byte val)
+        void Pla_WriteExpansionLo(int addr, byte val)
         {
             address = addr;
             bus = val;
             cartPort.WriteLoExp(addr, val);
         }
 
-        void Pla_WriteMemory(ushort addr, byte val)
+        void Pla_WriteMemory(int addr, byte val)
         {
             address = addr;
             bus = val;
             ram.Write(addr, val);
         }
 
-        void Pla_WriteSid(ushort addr, byte val)
+        void Pla_WriteSid(int addr, byte val)
         {
             address = addr;
             bus = val;
             sid.Write(addr, val);
         }
 
-        void Pla_WriteVic(ushort addr, byte val)
+        void Pla_WriteVic(int addr, byte val)
         {
             address = addr;
             bus = val;
             vic.Write(addr, val);
         }
 
-        bool SerPort_DeviceReadAtn()
+        bool SerPort_ReadAtnOut()
         {
             return (cia1.PortBData & 0x08) == 0;
         }
 
-        bool SerPort_DeviceReadClock()
+        bool SerPort_ReadClockOut()
         {
             return (cia1.PortAData & 0x10) == 0;
         }
 
-        bool SerPort_DeviceReadData()
+        bool SerPort_ReadDataOut()
         {
             return (cia1.PortAData & 0x20) == 0;
         }
 
-        bool SerPort_DeviceReadReset()
-        {
-            // this triggers hard reset on ext device when low
-            return true;
-        }
-
-        void SerPort_DeviceWriteAtn(bool val)
-        {
-            // currently not wired
-        }
-
-        void SerPort_DeviceWriteClock(bool val)
-        {
-            //cia1DataA = Port.ExternalWrite(cia1DataA, (byte)((cia1DataA & 0xBF) | (val ? 0x00 : 0x40)), cia1DirA);
-        }
-
-        void SerPort_DeviceWriteData(bool val)
-        {
-            //cia1DataA = Port.ExternalWrite(cia1DataA, (byte)((cia1DataA & 0x7F) | (val ? 0x00 : 0x80)), cia1DirA);
-        }
-
-        void SerPort_DeviceWriteSrq(bool val)
-        {
-            //cia0FlagSerial = val;
-            //cia0.FLAG = cia0FlagCassette & cia0FlagSerial;
-        }
-
         byte Sid_ReadPotX()
         {
             return 0;
@@ -301,7 +281,7 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return 0;
         }
 
-        byte Vic_ReadMemory(ushort addr)
+        byte Vic_ReadMemory(int addr)
         {
             switch (cia1.PortAData & 0x3)
             {
@@ -323,7 +303,7 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return bus;
         }
 
-        byte Vic_ReadColorRam(ushort addr)
+        byte Vic_ReadColorRam(int addr)
         {
             address = addr;
             bus &= 0xF0;

BizHawk.Emulation/Computers/Commodore64/C64.cs

@@ -146,12 +146,12 @@ namespace BizHawk.Emulation.Computers.Commodore64
 		{
 			// chips must be initialized before this code runs!
 			var domains = new List<MemoryDomain>(1);
-			domains.Add(new MemoryDomain("System Bus", 0x10000, Endian.Little, new Func<int, byte>(board.cpu.Peek), new Action<int, byte>(board.cpu.Poke)));
+			domains.Add(new MemoryDomain("System Bus", 0x10000, Endian.Little, board.cpu.Peek, board.cpu.Poke));
-			domains.Add(new MemoryDomain("RAM", 0x10000, Endian.Little, new Func<int, byte>(board.ram.Peek), new Action<int, byte>(board.ram.Poke)));
+			domains.Add(new MemoryDomain("RAM", 0x10000, Endian.Little, board.ram.Peek, board.ram.Poke));
-			domains.Add(new MemoryDomain("CIA0", 0x10, Endian.Little, new Func<int, byte>(board.cia0.Peek), new Action<int, byte>(board.cia0.Poke)));
+			domains.Add(new MemoryDomain("CIA0", 0x10, Endian.Little, board.cia0.Peek, board.cia0.Poke));
-			domains.Add(new MemoryDomain("CIA1", 0x10, Endian.Little, new Func<int, byte>(board.cia1.Peek), new Action<int, byte>(board.cia1.Poke)));
+			domains.Add(new MemoryDomain("CIA1", 0x10, Endian.Little, board.cia1.Peek, board.cia1.Poke));
-			domains.Add(new MemoryDomain("VIC", 0x40, Endian.Little, new Func<int, byte>(board.vic.Peek), new Action<int, byte>(board.vic.Poke)));
+			domains.Add(new MemoryDomain("VIC", 0x40, Endian.Little, board.vic.Peek, board.vic.Poke));
-			domains.Add(new MemoryDomain("SID", 0x20, Endian.Little, new Func<int, byte>(board.sid.Peek), new Action<int, byte>(board.sid.Poke)));
+			domains.Add(new MemoryDomain("SID", 0x20, Endian.Little, board.sid.Peek, board.sid.Poke));
 			//domains.Add(new MemoryDomain("1541 Bus", 0x10000, Endian.Little, new Func<int, byte>(disk.Peek), new Action<int, byte>(disk.Poke)));
 			//domains.Add(new MemoryDomain("1541 VIA0", 0x10, Endian.Little, new Func<int, byte>(disk.PeekVia0), new Action<int, byte>(disk.PokeVia0)));
 			//domains.Add(new MemoryDomain("1541 VIA1", 0x10, Endian.Little, new Func<int, byte>(disk.PeekVia1), new Action<int, byte>(disk.PokeVia1)));

BizHawk.Emulation/Computers/Commodore64/Cartridge/Cart.cs

@@ -18,14 +18,14 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 
 			if (new string(reader.ReadChars(16)) == "C64 CARTRIDGE   ")
 			{
-				List<uint> chipAddress = new List<uint>();
+				List<int> chipAddress = new List<int>();
-				List<uint> chipBank = new List<uint>();
+				List<int> chipBank = new List<int>();
 				List<byte[]> chipData = new List<byte[]>();
-				List<uint> chipType = new List<uint>();
+				List<int> chipType = new List<int>();
 
-				uint headerLength = ReadCRTInt(reader);
+				int headerLength = ReadCRTInt(reader);
-				uint version = ReadCRTShort(reader);
+				int version = ReadCRTShort(reader);
-				uint mapper = ReadCRTShort(reader);
+				int mapper = ReadCRTShort(reader);
 				bool exrom = (reader.ReadByte() != 0);
 				bool game = (reader.ReadByte() != 0);
 
@@ -38,7 +38,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 				// skip extra header bytes
 				if (headerLength > 0x40)
 				{
-					reader.ReadBytes((int)headerLength - 0x40);
+					reader.ReadBytes(headerLength - 0x40);
 				}
 
 				// read chips
@@ -46,15 +46,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 				{
 					if (new string(reader.ReadChars(4)) == "CHIP")
 					{
-						uint chipLength = ReadCRTInt(reader);
+						int chipLength = ReadCRTInt(reader);
 						chipType.Add(ReadCRTShort(reader));
 						chipBank.Add(ReadCRTShort(reader));
 						chipAddress.Add(ReadCRTShort(reader));
-						uint chipDataLength = ReadCRTShort(reader);
+						int chipDataLength = ReadCRTShort(reader);
-						chipData.Add(reader.ReadBytes((int)chipDataLength));
+						chipData.Add(reader.ReadBytes(chipDataLength));
 						chipLength -= (chipDataLength + 0x10);
 						if (chipLength > 0)
-							reader.ReadBytes((int)chipLength);
+							reader.ReadBytes(chipLength);
 					}
 				}
 
@@ -96,21 +96,21 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			return result;
 		}
 
-		static private uint ReadCRTShort(BinaryReader reader)
+		static private int ReadCRTShort(BinaryReader reader)
 		{
-			uint result;
+			int result;
-			result = (uint)reader.ReadByte() << 8;
+			result = (int)reader.ReadByte() << 8;
-			result |= (uint)reader.ReadByte();
+			result |= (int)reader.ReadByte();
 			return result;
 		}
 
-		static private uint ReadCRTInt(BinaryReader reader)
+		static private int ReadCRTInt(BinaryReader reader)
 		{
-			uint result;
+			int result;
-			result = (uint)reader.ReadByte() << 24;
+			result = (int)reader.ReadByte() << 24;
-			result |= (uint)reader.ReadByte() << 16;
+			result |= (int)reader.ReadByte() << 16;
-			result |= (uint)reader.ReadByte() << 8;
+			result |= (int)reader.ReadByte() << 8;
-			result |= (uint)reader.ReadByte();
+			result |= (int)reader.ReadByte();
 			return result;
 		}
 
@@ -206,22 +206,22 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 		{
 		}
 
-		public virtual byte Read8000(ushort addr)
+		public virtual byte Read8000(int addr)
 		{
 			return 0xFF;
 		}
 
-		public virtual byte ReadA000(ushort addr)
+		public virtual byte ReadA000(int addr)
 		{
 			return 0xFF;
 		}
 
-		public virtual byte ReadDE00(ushort addr)
+		public virtual byte ReadDE00(int addr)
 		{
 			return 0xFF;
 		}
 
-		public virtual byte ReadDF00(ushort addr)
+		public virtual byte ReadDF00(int addr)
 		{
 			return 0xFF;
 		}
@@ -252,19 +252,19 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			}
 		}
 
-		public virtual void Write8000(ushort addr, byte val)
+		public virtual void Write8000(int addr, byte val)
 		{
 		}
 
-		public virtual void WriteA000(ushort addr, byte val)
+		public virtual void WriteA000(int addr, byte val)
 		{
 		}
 
-		public virtual void WriteDE00(ushort addr, byte val)
+		public virtual void WriteDE00(int addr, byte val)
 		{
 		}
 
-		public virtual void WriteDF00(ushort addr, byte val)
+		public virtual void WriteDF00(int addr, byte val)
 		{
 		}
 	}

BizHawk.Emulation/Computers/Commodore64/Cartridge/Mapper0000.cs

@@ -6,14 +6,14 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 	public class Mapper0000 : Cart
 	{
 		private byte[] romA;
-		private uint romAMask;
+		private int romAMask;
 		private byte[] romB;
-		private uint romBMask;
+		private int romBMask;
 
 		// standard cartridge mapper (Commodore)
 		// note that this format also covers Ultimax carts
 
-		public Mapper0000(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData, bool game, bool exrom)
+		public Mapper0000(List<int> newAddresses, List<int> newBanks, List<byte[]> newData, bool game, bool exrom)
 		{
 			pinGame = game;
 			pinExRom = exrom;
@@ -83,12 +83,12 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			return romB[addr & romBMask];
 		}
 
-		public override byte Read8000(ushort addr)
+		public override byte Read8000(int addr)
 		{
 			return romA[addr & romAMask];
 		}
 
-		public override byte ReadA000(ushort addr)
+		public override byte ReadA000(int addr)
 		{
 			return romB[addr & romBMask];
 		}

BizHawk.Emulation/Computers/Commodore64/Cartridge/Mapper0005.cs

@@ -7,19 +7,19 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 	{
 		private byte[][] banksA = new byte[0][]; //8000
 		private byte[][] banksB = new byte[0][]; //A000
-		private uint bankMask;
+		private int bankMask;
-		private uint bankNumber;
+		private int bankNumber;
 		private byte[] currentBankA;
 		private byte[] currentBankB;
 		private byte[] dummyBank;
 
-		public Mapper0005(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData)
+		public Mapper0005(List<int> newAddresses, List<int> newBanks, List<byte[]> newData)
 		{
-			uint count = (uint)newAddresses.Count;
+			int count = newAddresses.Count;
 
 			// build dummy bank
 			dummyBank = new byte[0x2000];
-			for (uint i = 0; i < 0x2000; i++)
+			for (int i = 0; i < 0x2000; i++)
 				dummyBank[i] = 0xFF; // todo: determine if this is correct
 
 			if (count == 64) //512k
@@ -80,9 +80,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			}
 
 			// for safety, initialize all banks to dummy
-			for (uint i = 0; i < banksA.Length; i++)
+			for (int i = 0; i < banksA.Length; i++)
 				banksA[i] = dummyBank;
-			for (uint i = 0; i < banksB.Length; i++)
+			for (int i = 0; i < banksB.Length; i++)
 				banksB[i] = dummyBank;
 
 			// now load in the banks
@@ -101,7 +101,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			BankSet(0);
 		}
 
-		private void BankSet(uint index)
+		private void BankSet(int index)
 		{
 			bankNumber = index & bankMask;
 			if (!pinExRom)
@@ -131,17 +131,17 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 				BankSet(val);
 		}
 
-		public override byte Read8000(ushort addr)
+		public override byte Read8000(int addr)
 		{
 			return currentBankA[addr];
 		}
 
-		public override byte ReadA000(ushort addr)
+		public override byte ReadA000(int addr)
 		{
 			return currentBankB[addr];
 		}
 
-		public override void WriteDE00(ushort addr, byte val)
+		public override void WriteDE00(int addr, byte val)
 		{
 			if (addr == 0x00)
 				BankSet(val);

BizHawk.Emulation/Computers/Commodore64/Cartridge/Mapper000B.cs

@@ -14,11 +14,11 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 	{
 		private byte[] rom = new byte[0x4000];
 
-		public Mapper000B(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData)
+		public Mapper000B(List<int> newAddresses, List<int> newBanks, List<byte[]> newData)
 		{
 			validCartridge = false;
 
-			for (uint i = 0; i < 0x4000; i++)
+			for (int i = 0; i < 0x4000; i++)
 				rom[i] = 0xFF;
 
 			if (newAddresses[0] == 0x8000)
@@ -38,17 +38,17 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			return rom[addr | 0x2000];
 		}
 
-		public override byte Read8000(ushort addr)
+		public override byte Read8000(int addr)
 		{
 			return rom[addr];
 		}
 
-		public override byte ReadA000(ushort addr)
+		public override byte ReadA000(int addr)
 		{
 			return rom[addr | 0x2000];
 		}
 
-		public override byte ReadDF00(ushort addr)
+		public override byte ReadDF00(int addr)
 		{
 			pinGame = true;
 			return base.ReadDF00(addr);

BizHawk.Emulation/Computers/Commodore64/Cartridge/Mapper000F.cs

@@ -13,21 +13,21 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 	public class Mapper000F : Cart
 	{
 		private byte[][] banks = new byte[0][]; //8000
-		private uint bankMask;
+		private int bankMask;
-		private uint bankNumber;
+		private int bankNumber;
 		private byte[] currentBank;
 		private byte[] dummyBank;
 
-		public Mapper000F(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData)
+		public Mapper000F(List<int> newAddresses, List<int> newBanks, List<byte[]> newData)
 		{
-			uint count = (uint)newAddresses.Count;
+			int count = newAddresses.Count;
 
 			pinGame = true;
 			pinExRom = false;
 
 			// build dummy bank
 			dummyBank = new byte[0x2000];
-			for (uint i = 0; i < 0x2000; i++)
+			for (int i = 0; i < 0x2000; i++)
 				dummyBank[i] = 0xFF; // todo: determine if this is correct
 
 			if (count == 64) //512k
@@ -72,7 +72,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			}
 
 			// for safety, initialize all banks to dummy
-			for (uint i = 0; i < banks.Length; i++)
+			for (int i = 0; i < banks.Length; i++)
 				banks[i] = dummyBank;
 
 			// now load in the banks
@@ -87,7 +87,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			BankSet(0);
 		}
 
-		protected void BankSet(uint index)
+		protected void BankSet(int index)
 		{
 			bankNumber = index & bankMask;
 			UpdateState();
@@ -100,10 +100,10 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 
 		public override void PokeDE00(int addr, byte val)
 		{
-			BankSet((uint)addr);
+			BankSet(addr);
 		}
 
-		public override byte Read8000(ushort addr)
+		public override byte Read8000(int addr)
 		{
 			return currentBank[addr];
 		}
@@ -113,9 +113,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			currentBank = banks[bankNumber];
 		}
 
-		public override void WriteDE00(ushort addr, byte val)
+		public override void WriteDE00(int addr, byte val)
 		{
-			BankSet((uint)addr);
+			BankSet(addr);
 		}
 
 		public override void SyncState(Serializer ser)

BizHawk.Emulation/Computers/Commodore64/Cartridge/Mapper0011.cs

@@ -9,7 +9,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 
 	public class Mapper0011 : Mapper000F
 	{
-		public Mapper0011(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData)
+		public Mapper0011(List<int> newAddresses, List<int> newBanks, List<byte[]> newData)
 			: base(newAddresses, newBanks, newData)
 		{
 			// required to pass information to base class
@@ -20,13 +20,13 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			// do nothing
 		}
 
-		public override byte ReadDE00(ushort addr)
+		public override byte ReadDE00(int addr)
 		{
-			BankSet((uint)addr);
+			BankSet(addr);
 			return base.ReadDE00(addr);
 		}
 
-		public override void WriteDE00(ushort addr, byte val)
+		public override void WriteDE00(int addr, byte val)
 		{
 			// do nothing
 		}

BizHawk.Emulation/Computers/Commodore64/Cartridge/Mapper0012.cs

@@ -8,21 +8,21 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 		private byte[] bankMain;
 		private byte[][] bankHigh;
 		private byte[] bankHighSelected;
-		private uint bankIndex;
+		private int bankIndex;
 		private byte[] dummyBank;
 
 		// Zaxxon and Super Zaxxon cartridges
 		// - read to 8xxx selects bank 0 in A000-BFFF
 		// - read to 9xxx selects bank 1 in A000-BFFF
 
-		public Mapper0012(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData)
+		public Mapper0012(List<int> newAddresses, List<int> newBanks, List<byte[]> newData)
 		{
 			bankMain = new byte[0x2000];
 			bankHigh = new byte[2][];
 			dummyBank = new byte[0x2000];
 
 			// create dummy bank just in case
-			for (uint i = 0; i < 0x2000; i++)
+			for (int i = 0; i < 0x2000; i++)
 				dummyBank[i] = 0xFF;
 
 			bankHigh[0] = dummyBank;
@@ -56,14 +56,14 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			return bankHighSelected[addr];
 		}
 
-		public override byte Read8000(ushort addr)
+		public override byte Read8000(int addr)
 		{
-			bankIndex = (addr & (uint)0x1000) >> 12;
+			bankIndex = (addr & 0x1000) >> 12;
 			bankHighSelected = bankHigh[bankIndex];
 			return bankMain[addr];
 		}
 
-		public override byte ReadA000(ushort addr)
+		public override byte ReadA000(int addr)
 		{
 			return bankHighSelected[addr];
 		}

BizHawk.Emulation/Computers/Commodore64/Cartridge/Mapper0013.cs

@@ -14,15 +14,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 	public class Mapper0013 : Cart
 	{
 		private byte[][] banks = new byte[0][]; //8000
-		private uint bankMask;
+		private int bankMask;
-		private uint bankNumber;
+		private int bankNumber;
 		private byte[] currentBank;
 		private byte[] dummyBank;
 		private bool romEnable;
 
-		public Mapper0013(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData)
+		public Mapper0013(List<int> newAddresses, List<int> newBanks, List<byte[]> newData)
 		{
-			uint count = (uint)newAddresses.Count;
+			int count = newAddresses.Count;
 
 			pinGame = true;
 			pinExRom = false;
@@ -30,7 +30,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 
 			// build dummy bank
 			dummyBank = new byte[0x2000];
-			for (uint i = 0; i < 0x2000; i++)
+			for (int i = 0; i < 0x2000; i++)
 				dummyBank[i] = 0xFF; // todo: determine if this is correct
 
 			if (count == 16) //128k
@@ -55,7 +55,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			}
 
 			// for safety, initialize all banks to dummy
-			for (uint i = 0; i < banks.Length; i++)
+			for (int i = 0; i < banks.Length; i++)
 				banks[i] = dummyBank;
 
 			// now load in the banks
@@ -70,7 +70,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			BankSet(0);
 		}
 
-		private void BankSet(uint index)
+		private void BankSet(int index)
 		{
 			bankNumber = index & bankMask;
 			romEnable = ((index & 0x80) == 0);
@@ -88,7 +88,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 				BankSet(val);
 		}
 
-		public override byte Read8000(ushort addr)
+		public override byte Read8000(int addr)
 		{
 			return currentBank[addr];
 		}
@@ -108,7 +108,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			}
 		}
 
-		public override void WriteDE00(ushort addr, byte val)
+		public override void WriteDE00(int addr, byte val)
 		{
 			if (addr == 0x00)
 				BankSet(val);
@@ -121,7 +121,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			ser.Sync("bankNumber", ref bankNumber);
 			ser.Sync("romEnable", ref romEnable);
 			if (ser.IsReader)
-				BankSet(bankNumber | (uint)(romEnable ? 0x00 : 0x80));
+				BankSet(bankNumber | (romEnable ? 0x00 : 0x80));
 		}
 	}
 }

BizHawk.Emulation/Computers/Commodore64/Cartridge/Mapper0020.cs

@@ -21,20 +21,20 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 	{
 		private byte[][] banksA = new byte[64][]; //8000
 		private byte[][] banksB = new byte[64][]; //A000
-		private uint bankNumber;
+		private int bankNumber;
 		private bool boardLed;
 		private byte[] currentBankA;
 		private byte[] currentBankB;
 		private byte[] dummyBank;
 		private byte[] ram = new byte[256];
 
-		public Mapper0020(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData)
+		public Mapper0020(List<int> newAddresses, List<int> newBanks, List<byte[]> newData)
 		{
-			uint count = (uint)newAddresses.Count;
+			int count = newAddresses.Count;
 
 			// build dummy bank
 			dummyBank = new byte[0x2000];
-			for (uint i = 0; i < 0x2000; i++)
+			for (int i = 0; i < 0x2000; i++)
 				dummyBank[i] = 0xFF; // todo: determine if this is correct
 
 			// force ultimax mode (the cart SHOULD set this
@@ -43,9 +43,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			pinExRom = true;
 
 			// for safety, initialize all banks to dummy
-			for (uint i = 0; i < 64; i++)
+			for (int i = 0; i < 64; i++)
 				banksA[i] = dummyBank;
-			for (uint i = 0; i < 64; i++)
+			for (int i = 0; i < 64; i++)
 				banksB[i] = dummyBank;
 
 			// load in all banks
@@ -65,7 +65,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			BankSet(0);
 		}
 
-		private void BankSet(uint index)
+		private void BankSet(int index)
 		{
 			bankNumber = index & 0x3F;
 			UpdateState();
@@ -121,17 +121,17 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			ram[addr] = val;
 		}
 
-		public override byte Read8000(ushort addr)
+		public override byte Read8000(int addr)
 		{
 			return currentBankA[addr];
 		}
 
-		public override byte ReadA000(ushort addr)
+		public override byte ReadA000(int addr)
 		{
 			return currentBankB[addr];
 		}
 
-		public override byte ReadDF00(ushort addr)
+		public override byte ReadDF00(int addr)
 		{
 			return ram[addr];
 		}
@@ -150,7 +150,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 			currentBankB = banksB[bankNumber];
 		}
 
-		public override void WriteDE00(ushort addr, byte val)
+		public override void WriteDE00(int addr, byte val)
 		{
 			if (addr == 0x00)
 				BankSet(val);
@@ -158,7 +158,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridge
 				StateSet(val);
 		}
 
-		public override void WriteDF00(ushort addr, byte val)
+		public override void WriteDF00(int addr, byte val)
 		{
 			ram[addr] = val;
 		}

BizHawk.Emulation/Computers/Commodore64/MOS/CartridgePort.cs

@@ -1,9 +1,13 @@
-using BizHawk.Emulation.Computers.Commodore64.Cartridge;
+using System;
+using BizHawk.Emulation.Computers.Commodore64.Cartridge;
 
 namespace BizHawk.Emulation.Computers.Commodore64.MOS
 {
 	public class CartridgePort
 	{
+        public Func<bool> ReadIRQ;
+        public Func<bool> ReadNMI;
+
 		private Cart cart;
 		private bool connected;
 
@@ -27,15 +31,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
         public bool ReadExRom() { if (connected) { return cart.ExRom; } else { return true; } }
         public bool ReadGame() { if (connected) { return cart.Game; } else { return true; } }
-        public byte ReadHiExp(ushort addr) { if (connected) { return cart.ReadDF00((ushort)(addr & 0x00FF)); } else { return 0xFF; } }
+        public byte ReadHiExp(int addr) { if (connected) { return cart.ReadDF00((addr & 0x00FF)); } else { return 0xFF; } }
-		public byte ReadHiRom(ushort addr) { if (connected) { return cart.ReadA000((ushort)(addr & 0x1FFF)); } else { return 0xFF; } }
+		public byte ReadHiRom(int addr) { if (connected) { return cart.ReadA000((addr & 0x1FFF)); } else { return 0xFF; } }
-		public byte ReadLoExp(ushort addr) { if (connected) { return cart.ReadDE00((ushort)(addr & 0x00FF)); } else { return 0xFF; } }
+		public byte ReadLoExp(int addr) { if (connected) { return cart.ReadDE00((addr & 0x00FF)); } else { return 0xFF; } }
-		public byte ReadLoRom(ushort addr) { if (connected) { return cart.Read8000((ushort)(addr & 0x1FFF)); } else { return 0xFF; } }
+		public byte ReadLoRom(int addr) { if (connected) { return cart.Read8000((addr & 0x1FFF)); } else { return 0xFF; } }
 
-		public void WriteHiExp(ushort addr, byte val) { if (connected) { cart.WriteDF00((ushort)(addr & 0x00FF), val); } }
+		public void WriteHiExp(int addr, byte val) { if (connected) { cart.WriteDF00((addr & 0x00FF), val); } }
-		public void WriteHiRom(ushort addr, byte val) { if (connected) { cart.WriteA000((ushort)(addr & 0x1FFF), val); } }
+		public void WriteHiRom(int addr, byte val) { if (connected) { cart.WriteA000((addr & 0x1FFF), val); } }
-		public void WriteLoExp(ushort addr, byte val) { if (connected) { cart.WriteDE00((ushort)(addr & 0x00FF), val); } }
+		public void WriteLoExp(int addr, byte val) { if (connected) { cart.WriteDE00((addr & 0x00FF), val); } }
-		public void WriteLoRom(ushort addr, byte val) { if (connected) { cart.Write8000((ushort)(addr & 0x1FFF), val); } }
+		public void WriteLoRom(int addr, byte val) { if (connected) { cart.Write8000((addr & 0x1FFF), val); } }
 
 		// ------------------------------------------
 
@@ -56,14 +60,6 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			// note: this will not disconnect any attached media
 		}
 
-		public bool IRQ
-		{
-			get
-			{
-				return true; //todo: hook this up to cartridge
-			}
-		}
-
 		public bool IsConnected
 		{
 			get
@@ -72,15 +68,17 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			}
 		}
 
-		public bool NMI
+        public bool ReadIRQBuffer()
-		{
+        {
-			get
+            return true;
-			{
+        }
-				return true; //todo: hook this up to cartridge
-			}
-		}
 
-		public void SyncState(Serializer ser)
+        public bool ReadNMIBuffer()
+        {
+            return true;
+        }
+
+        public void SyncState(Serializer ser)
 		{
 			ser.Sync("connected", ref connected);
 			if (connected)

BizHawk.Emulation/Computers/Commodore64/MOS/CassettePort.cs

@@ -11,20 +11,14 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		{
 		}
 
-        public bool DataInput
+        public bool ReadDataInputBuffer()
         {
-            get
+            return true;
-            {
-                return true;
-            }
         }
 
-        public bool Sense
+        public bool ReadSenseBuffer()
         {
-            get
+            return true;
-            {
-                return true;
-            }
         }
 	}
 }

BizHawk.Emulation/Computers/Commodore64/MOS/Chip2114.cs

@@ -31,12 +31,12 @@
 			ram[addr & 0x3FF] = (byte)(val & 0xF);
 		}
 
-		public byte Read(ushort addr)
+		public byte Read(int addr)
 		{
 			return (byte)(ram[addr & 0x3FF]);
 		}
 
-		public byte Read(ushort addr, byte bus)
+		public byte Read(int addr, byte bus)
 		{
 			return (byte)(ram[addr & 0x3FF] | (bus & 0xF0));
 		}
@@ -47,7 +47,7 @@
 			ser.Sync("ram", ref buffer);
 		}
 
-		public void Write(ushort addr, byte val)
+		public void Write(int addr, byte val)
 		{
 			ram[addr & 0x3FF] = (byte)(val & 0xF);
 		}

BizHawk.Emulation/Computers/Commodore64/MOS/Chip23XX.cs

@@ -43,7 +43,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		public byte Peek(int addr)
 		{
-			return rom[addr & (int)addrMask];
+			return rom[addr & addrMask];
 		}
 
 		public void Poke(int addr, byte val)
@@ -51,7 +51,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			// do nothing (this is rom)
 		}
 
-		public byte Read(ushort addr)
+		public byte Read(int addr)
 		{
 			return rom[addr & addrMask];
 		}
@@ -62,7 +62,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			ser.Sync("rom", ref buffer);
 		}
 
-		public void Write(ushort addr, byte val)
+		public void Write(int addr, byte val)
 		{
 			// do nothing (this is rom)
 		}

BizHawk.Emulation/Computers/Commodore64/MOS/Chip4864.cs

@@ -30,15 +30,15 @@
 
 		public byte Peek(int addr)
 		{
-			return ram[addr & 0xFFFF];
+			return ram[addr];
 		}
 
 		public void Poke(int addr, byte val)
 		{
-			ram[addr & 0xFFFF] = val;
+			ram[addr] = val;
 		}
 
-		public byte Read(ushort addr)
+		public byte Read(int addr)
 		{
 			return ram[addr];
 		}
@@ -49,7 +49,7 @@
 			ser.Sync("ram", ref buffer);
 		}
 
-		public void Write(ushort addr, byte val)
+		public void Write(int addr, byte val)
 		{
 			ram[addr] = val;
 		}

BizHawk.Emulation/Computers/Commodore64/MOS/MOS6510.cs

@@ -28,9 +28,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		public Func<bool> ReadIRQ;
 		public Func<bool> ReadNMI;
 		public Func<bool> ReadRDY;
-		public Func<ushort, byte> ReadMemory;
+		public Func<int, byte> ReadMemory;
         public Func<byte> ReadPort;
-		public Action<ushort, byte> WriteMemory;
+		public Action<int, byte> WriteMemory;
 
 		// ------------------------------------
 
@@ -65,7 +65,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			cpu.FlagI = true;
 			cpu.BCD_Enabled = true;
             if (ReadMemory != null)
-			    cpu.PC = (ushort)(ReadMemory(0xFFFC) | (ReadMemory(0xFFFD) << 8));
+			    cpu.PC = (ushort)(ReadMemory(0x0FFFC) | (ReadMemory(0x0FFFD) << 8));
 
             // configure data port defaults
             port = new LatchedPort();
@@ -130,6 +130,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		public byte Peek(int addr)
 		{
+            addr &= 0xFFFF;
 			if (addr == 0x0000)
 				return port.Direction;
 			else if (addr == 0x0001)
@@ -140,7 +141,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		public void Poke(int addr, byte val)
 		{
-			if (addr == 0x0000)
+            addr &= 0xFFFF;
+            if (addr == 0x0000)
 				port.Direction = val;
 			else if (addr == 0x0001)
 				port.Latch = val;

BizHawk.Emulation/Computers/Commodore64/MOS/MOS6526.cs

@@ -45,6 +45,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
         public Func<bool> ReadCNT;
         public Func<bool> ReadFlag;
+        public Func<bool> ReadSP;
 
         // ------------------------------------
 
@@ -60,9 +61,11 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		private bool intSP;
 		private bool[] intTimer;
 		private bool pinCnt;
-		private bool pinPC;
+        private bool pinCntLast;
+        private bool pinPC;
+        private bool pinSP;
 		private byte sr;
-		private uint[] timerDelay;
+		private int[] timerDelay;
 		private InMode[] timerInMode;
 		private OutMode[] timerOutMode;
 		private bool[] timerPortEnable;
@@ -72,8 +75,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		private byte[] tod;
 		private byte[] todAlarm;
 		private bool todAlarmPM;
-		private uint todCounter;
+		private int todCounter;
-		private uint todCounterLatch;
+		private int todCounterLatch;
 		private bool todIn;
 		private bool todPM;
 
@@ -84,7 +87,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			chipRegion = region;
 			enableIntTimer = new bool[2];
 			intTimer = new bool[2];
-			timerDelay = new uint[2];
+			timerDelay = new int[2];
 			timerInMode = new InMode[2];
 			timerOutMode = new OutMode[2];
 			timerPortEnable = new bool[2];
@@ -106,8 +109,12 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		public void ExecutePhase2()
 		{
 			{
-				pinPC = true;
+                bool sumCnt = ReadCNT();
-				TODRun();
+                cntPos |= (!pinCntLast && sumCnt);
+                pinCntLast = sumCnt;
+
+                pinPC = true;
+                TODRun();
 
 				if (timerPulse[0])
 				{
@@ -217,12 +224,12 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		{
 			
 			{
-				uint lo;
+				int lo;
-				uint hi;
+				int hi;
-				uint result;
+				int result;
 
-				lo = (i & (uint)0x0F) + (j & (uint)0x0F);
+				lo = (i & 0x0F) + (j & 0x0F);
-				hi = (i & (uint)0x70) + (j & (uint)0x70);
+				hi = (i & 0x70) + (j & 0x70);
 				if (lo > 0x09)
 				{
 					hi += 0x10;
@@ -238,13 +245,13 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			}
 		}
 
-		private void TimerRun(uint index)
+		private void TimerRun(int index)
 		{
 			
 			{
 				if (timerOn[index])
 				{
-					uint t = timer[index];
+					int t = timer[index];
 					bool u = false;
 					
 					{
@@ -356,33 +363,22 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		// ------------------------------------
 
-		public bool CNT
-		{
-			get { return pinCnt; }
-			set { cntPos |= (!pinCnt && value); pinCnt = value; }
-		}
-
-		public bool PC
-		{
-			get { return pinPC; }
-		}
-
 		public byte Peek(int addr)
 		{
-			return ReadRegister((ushort)(addr & 0xF));
+			return ReadRegister((addr & 0xF));
 		}
 
 		public void Poke(int addr, byte val)
 		{
-			WriteRegister((ushort)(addr & 0xF), val);
+			WriteRegister((addr & 0xF), val);
 		}
 
-		public byte Read(ushort addr)
+		public byte Read(int addr)
 		{
 			return Read(addr, 0xFF);
 		}
 
-		public byte Read(ushort addr, byte mask)
+		public byte Read(int addr, byte mask)
 		{
 			addr &= 0xF;
 			byte val;
@@ -411,18 +407,28 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			return val;
 		}
 
-		private byte ReadRegister(ushort addr)
+        public bool ReadCNTBuffer()
+        {
+            return pinCnt;
+        }
+
+        public bool ReadPCBuffer()
+        {
+            return pinPC;
+        }
+
+		private byte ReadRegister(int addr)
 		{
 			byte val = 0x00; //unused pin value
-			uint timerVal;
+			int timerVal;
 
 			switch (addr)
 			{
 				case 0x0:
-					val = portA.ReadInput(ReadPortA());
+					val = (byte)(portA.ReadInput(ReadPortA()) & PortAMask);
 					break;
 				case 0x1:
-					val = portB.ReadInput(ReadPortB());
+					val = (byte)(portB.ReadInput(ReadPortB()) & PortBMask);
 					break;
 				case 0x2:
                     val = portA.Direction;
@@ -512,7 +518,12 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			return val;
 		}
 
-		private uint ReadTimerValue(uint index)
+        public bool ReadSPBuffer()
+        {
+            return pinSP;
+        }
+
+		private int ReadTimerValue(int index)
 		{
 			if (timerOn[index])
 			{
@@ -530,13 +541,13 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		public void SyncState(Serializer ser)
 		{
 			int chipRegionInt = (int)chipRegion;
-			int timerInModeInt0 = (int)timerInMode[0];
+            int timerInModeInt0 = (int)timerInMode[0];
-			int timerInModeInt1 = (int)timerInMode[1];
+            int timerInModeInt1 = (int)timerInMode[1];
-			int timerOutModeInt0 = (int)timerOutMode[0];
+            int timerOutModeInt0 = (int)timerOutMode[0];
-			int timerOutModeInt1 = (int)timerOutMode[1];
+            int timerOutModeInt1 = (int)timerOutMode[1];
-			int timerRunModeInt0 = (int)timerRunMode[0];
+            int timerRunModeInt0 = (int)timerRunMode[0];
-			int timerRunModeInt1 = (int)timerRunMode[1];
+            int timerRunModeInt1 = (int)timerRunMode[1];
-			int timerSPModeInt = (int)timerSPMode;
+            int timerSPModeInt = (int)timerSPMode;
 
 			SyncInternal(ser);
 			ser.Sync("alarmSelect", ref alarmSelect);
@@ -592,12 +603,12 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			timerSPMode = (SPMode)timerSPModeInt;
 		}
 
-		public void Write(ushort addr, byte val)
+		public void Write(int addr, byte val)
 		{
 			Write(addr, val, 0xFF);
 		}
 
-		public void Write(ushort addr, byte val, byte mask)
+		public void Write(int addr, byte val, byte mask)
 		{
 			addr &= 0xF;
 			val &= mask;
@@ -635,7 +646,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			}
 		}
 
-		public void WriteRegister(ushort addr, byte val)
+		public void WriteRegister(int addr, byte val)
 		{
 			bool intReg;
 
@@ -659,7 +670,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 					break;
 				case 0x5:
 					timerLatch[0] &= 0x00FF;
-					timerLatch[0] |= (uint)val << 8;
+					timerLatch[0] |= val << 8;
 					break;
 				case 0x6:
 					timerLatch[1] &= 0xFF00;
@@ -667,7 +678,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 					break;
 				case 0x7:
 					timerLatch[1] &= 0x00FF;
-					timerLatch[1] |= (uint)val << 8;
+					timerLatch[1] |= val << 8;
 					break;
 				case 0x8:
 					if (alarmSelect)

BizHawk.Emulation/Computers/Commodore64/MOS/MOSPLA.cs

@@ -34,34 +34,34 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		public Action<int, byte> PokeVic;
         public Func<bool> ReadAEC;
         public Func<bool> ReadBA;
-		public Func<ushort, byte> ReadBasicRom;
+		public Func<int, byte> ReadBasicRom;
-		public Func<ushort, byte> ReadCartridgeLo;
+		public Func<int, byte> ReadCartridgeLo;
-		public Func<ushort, byte> ReadCartridgeHi;
+		public Func<int, byte> ReadCartridgeHi;
 		public Func<bool> ReadCharen;
-		public Func<ushort, byte> ReadCharRom;
+		public Func<int, byte> ReadCharRom;
-		public Func<ushort, byte> ReadCia0;
+		public Func<int, byte> ReadCia0;
-		public Func<ushort, byte> ReadCia1;
+		public Func<int, byte> ReadCia1;
-		public Func<ushort, byte> ReadColorRam;
+		public Func<int, byte> ReadColorRam;
-		public Func<ushort, byte> ReadExpansionLo;
+		public Func<int, byte> ReadExpansionLo;
-		public Func<ushort, byte> ReadExpansionHi;
+		public Func<int, byte> ReadExpansionHi;
 		public Func<bool> ReadExRom;
 		public Func<bool> ReadGame;
 		public Func<bool> ReadHiRam;
-		public Func<ushort, byte> ReadKernalRom;
+		public Func<int, byte> ReadKernalRom;
 		public Func<bool> ReadLoRam;
-		public Func<ushort, byte> ReadMemory;
+		public Func<int, byte> ReadMemory;
-		public Func<ushort, byte> ReadSid;
+		public Func<int, byte> ReadSid;
-		public Func<ushort, byte> ReadVic;
+		public Func<int, byte> ReadVic;
-		public Action<ushort, byte> WriteCartridgeLo;
+		public Action<int, byte> WriteCartridgeLo;
-		public Action<ushort, byte> WriteCartridgeHi;
+		public Action<int, byte> WriteCartridgeHi;
-		public Action<ushort, byte> WriteCia0;
+		public Action<int, byte> WriteCia0;
-		public Action<ushort, byte> WriteCia1;
+		public Action<int, byte> WriteCia1;
-		public Action<ushort, byte> WriteColorRam;
+		public Action<int, byte> WriteColorRam;
-		public Action<ushort, byte> WriteExpansionLo;
+		public Action<int, byte> WriteExpansionLo;
-		public Action<ushort, byte> WriteExpansionHi;
+		public Action<int, byte> WriteExpansionHi;
-		public Action<ushort, byte> WriteMemory;
+		public Action<int, byte> WriteMemory;
-		public Action<ushort, byte> WriteSid;
+		public Action<int, byte> WriteSid;
-		public Action<ushort, byte> WriteVic;
+		public Action<int, byte> WriteVic;
 	
 		// ------------------------------------
 
@@ -127,16 +127,16 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
         bool aec;
         bool cas;
 
-		private PLABank Bank(ushort addr, bool read)
+		private PLABank Bank(int addr, bool read)
 		{
             loram = ReadLoRam();
             hiram = ReadHiRam();
             game = ReadGame();
 
-            a15 = (addr & 0x8000) != 0;
+            a15 = (addr & 0x08000) != 0;
-            a14 = (addr & 0x4000) != 0;
+            a14 = (addr & 0x04000) != 0;
-            a13 = (addr & 0x2000) != 0;
+            a13 = (addr & 0x02000) != 0;
-            a12 = (addr & 0x1000) != 0;
+            a12 = (addr & 0x01000) != 0;
             aec = !ReadAEC(); //active low
 
             p0 = loram && hiram && a15 && !a14 && a13 && !aec && read && game;
@@ -228,7 +228,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		public byte Peek(int addr)
 		{
-			switch (Bank((ushort)(addr & 0xFFFF), true))
+            addr &= 0x0FFFF;
+			switch (Bank(addr, true))
 			{
 				case PLABank.BasicROM:
 					return PeekBasicRom(addr);
@@ -250,8 +251,6 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 					return PeekExpansionHi(addr);
 				case PLABank.KernalROM:
 					return PeekKernalRom(addr);
-				case PLABank.None:
-					return 0xFF;
 				case PLABank.RAM:
 					return PeekMemory(addr);
 				case PLABank.Sid:
@@ -264,18 +263,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		public void Poke(int addr, byte val)
 		{
-			switch (Bank((ushort)(addr & 0xFFFF), false))
+            addr &= 0x0FFFF;
+			switch (Bank(addr, false))
 			{
-				case PLABank.BasicROM:
-					break;
 				case PLABank.CartridgeHi:
 					PokeCartridgeHi(addr, val);
 					break;
 				case PLABank.CartridgeLo:
 					PokeCartridgeLo(addr, val);
 					break;
-				case PLABank.CharROM:
-					break;
 				case PLABank.Cia0:
 					PokeCia0(addr, val);
 					break;
@@ -291,10 +287,6 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 				case PLABank.Expansion1:
 					PokeExpansionHi(addr, val);
 					break;
-				case PLABank.KernalROM:
-					break;
-				case PLABank.None:
-					break;
 				case PLABank.RAM:
 					PokeMemory(addr, val);
 					break;
@@ -307,8 +299,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			}
 		}
 
-		public byte Read(ushort addr)
+		public byte Read(int addr)
 		{
+            addr &= 0x0FFFF;
 			switch (Bank(addr, true))
 			{
 				case PLABank.BasicROM:
@@ -341,8 +334,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			return 0xFF;
 		}
 
-		public void Write(ushort addr, byte val)
+		public void Write(int addr, byte val)
 		{
+            addr &= 0x0FFFF;
 			switch (Bank(addr, false))
 			{
 				case PLABank.BasicROM:
@@ -355,8 +349,6 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 					WriteCartridgeLo(addr, val);
 			        WriteMemory(addr, val);
 					break;
-				case PLABank.CharROM:
-					break;
 				case PLABank.Cia0:
 					WriteCia0(addr, val);
 					break;
@@ -372,10 +364,6 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 				case PLABank.Expansion1:
 					WriteExpansionHi(addr, val);
                     return;
-				case PLABank.KernalROM:
-					break;
-				case PLABank.None:
-					break;
 				case PLABank.RAM:
 			        WriteMemory(addr, val);
 					break;

BizHawk.Emulation/Computers/Commodore64/MOS/Port.cs

@@ -36,4 +36,39 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
             return (byte)((Latch & Direction) | (Direction ^ 0xFF));
         }
     }
+
+    public class LatchedBooleanPort
+    {
+        public bool Direction;
+        public bool Latch;
+
+        public LatchedBooleanPort()
+        {
+            Direction = false;
+            Latch = false;
+        }
+
+        //  data    dir     bus     out
+        //  0       0       0       0
+        //  0       0       1       1
+
+        //  0       1       0       0
+        //  0       1       1       0
+
+        //  1       0       0       0
+        //  1       0       1       1
+
+        //  1       1       0       1
+        //  1       1       1       1
+
+        public bool ReadInput(bool bus)
+        {
+            return (Direction && Latch) || (!Direction && bus);
+        }
+
+        public bool ReadOutput()
+        {
+            return (Latch || !Direction);
+        }
+    }
 }

BizHawk.Emulation/Computers/Commodore64/MOS/SerialPort.cs

@@ -7,48 +7,26 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 	public class SerialPort
 	{
-		public Func<bool> DeviceReadAtn;
+        public Func<bool> ReadAtnOut;
-		public Func<bool> DeviceReadClock;
+        public Func<bool> ReadClockOut;
-		public Func<bool> DeviceReadData;
+        public Func<bool> ReadDataOut;
-		public Func<bool> DeviceReadReset;
-		public Action<bool> DeviceWriteAtn;
-		public Action<bool> DeviceWriteClock;
-		public Action<bool> DeviceWriteData;
-		public Action<bool> DeviceWriteSrq;
-
-		public Func<bool> SystemReadAtn;
-		public Func<bool> SystemReadClock;
-		public Func<bool> SystemReadData;
-		public Func<bool> SystemReadSrq;
-		public Action<bool> SystemWriteAtn;
-		public Action<bool> SystemWriteClock;
-		public Action<bool> SystemWriteData;
-		public Action<bool> SystemWriteReset;
-
-		// Connect() needs to set System functions above
 
 		public SerialPort()
 		{
-			DeviceReadAtn = (() => { return true; });
-			DeviceReadClock = (() => { return true; });
-			DeviceReadData = (() => { return true; });
-			DeviceReadReset = (() => { return true; });
-			DeviceWriteAtn = ((bool val) => { });
-			DeviceWriteClock = ((bool val) => { });
-			DeviceWriteData = ((bool val) => { });
-			DeviceWriteSrq = ((bool val) => { });
-			SystemReadAtn = (() => { return true; });
-			SystemReadClock = (() => { return true; });
-			SystemReadData = (() => { return true; });
-			SystemReadSrq = (() => { return true; });
-			SystemWriteAtn = ((bool val) => { });
-			SystemWriteClock = ((bool val) => { });
-			SystemWriteData = ((bool val) => { });
-			SystemWriteReset = ((bool val) => { });
 		}
 
 		public void HardReset()
 		{
 		}
+
+        public bool WriteClockIn()
+        {
+            return true;
+        }
+
+        public bool WriteDataIn()
+        {
+            return true;
+        }
 	}
 }

BizHawk.Emulation/Computers/Commodore64/MOS/Sid.cs

@@ -419,9 +419,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 					waveform = (value >> 4) & 0x0F;
 					wave = waveTable[waveform & 0x07];
 					ringMsbMask = ((~value >> 5) & (value >> 2) & 0x1) << 23;
-					noNoise = ((waveform & 0x8) != 0) ? (int)0x000 : (int)0xFFF;
+					noNoise = ((waveform & 0x8) != 0) ? 0x000 : 0xFFF;
 					noNoiseOrNoise = noNoise | noise;
-					noPulse = ((waveform & 0x4) != 0) ? (int)0x000 : (int)0xFFF;
+					noPulse = ((waveform & 0x4) != 0) ? 0x000 : 0xFFF;
 
 					if (!testPrev && test)
 					{
@@ -503,7 +503,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 						if (floatOutputTTL != 0 && --floatOutputTTL == 0)
 							output = 0x000;
 					}
-					pulse = ((accumulator >> 12) >= pulseWidth) ? (int)0xFFF : (int)0x000;
+					pulse = ((accumulator >> 12) >= pulseWidth) ? 0xFFF : 0x000;
 					return output;
 				}
 			}
@@ -759,15 +759,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		public byte Peek(int addr)
 		{
-			return ReadRegister((ushort)(addr & 0x1F));
+			return ReadRegister((addr & 0x1F));
 		}
 
 		public void Poke(int addr, byte val)
 		{
-			WriteRegister((ushort)(addr & 0x1F), val);
+			WriteRegister((addr & 0x1F), val);
 		}
 
-		public byte Read(ushort addr)
+		public byte Read(int addr)
 		{
 			addr &= 0x1F;
 			byte result = 0x00;
@@ -783,7 +783,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			return result;
 		}
 
-		private byte ReadRegister(ushort addr)
+		private byte ReadRegister(int addr)
 		{
 			byte result = 0x00;
 
@@ -892,7 +892,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			return result;
 		}
 
-		public void Write(ushort addr, byte val)
+		public void Write(int addr, byte val)
 		{
 			addr &= 0x1F;
 			switch (addr)
@@ -912,7 +912,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			}
 		}
 
-		private void WriteRegister(ushort addr, byte val)
+		private void WriteRegister(int addr, byte val)
 		{
 			switch (addr)
 			{

BizHawk.Emulation/Computers/Commodore64/MOS/Timer.cs

@@ -6,11 +6,14 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 	public abstract class Timer
 	{
+        public byte PortAMask = 0xFF;
+        public byte PortBMask = 0xFF;
+
 		protected bool pinIRQ;
         protected LatchedPort portA;
         protected LatchedPort portB;
-        protected uint[] timer;
+        protected int[] timer;
-		protected uint[] timerLatch;
+		protected int[] timerLatch;
 		protected bool[] timerOn;
 		protected bool[] underflow;
 
@@ -21,8 +24,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		{
             portA = new LatchedPort();
             portB = new LatchedPort();
-			timer = new uint[2];
+			timer = new int[2];
-			timerLatch = new uint[2];
+			timerLatch = new int[2];
 			timerOn = new bool[2];
 			underflow = new bool[2];
 		}
@@ -36,14 +39,6 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			pinIRQ = true;
 		}
 
-		public bool IRQ
-		{
-			get
-			{
-				return pinIRQ;
-			}
-		}
-
         public byte PortAData
         {
             get
@@ -60,7 +55,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
             }
         }
 
-        public bool ReadIRQ() { return pinIRQ; }
+        public bool ReadIRQBuffer() { return pinIRQ; }
 
 		protected void SyncInternal(Serializer ser)
 		{

BizHawk.Emulation/Computers/Commodore64/MOS/UserPort.cs

@@ -4,51 +4,14 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 {
 	public class UserPort
 	{
-		private Func<int, byte> peekMemory;
+        public Func<bool> ReadCounter1;
-		private Action<int, byte> pokeMemory;
+        public Func<bool> ReadCounter2;
-		private Func<ushort, byte> readMemory;
+        public Func<bool> ReadHandshake;
-		private Action<ushort, byte> writeMemory;
+        public Func<bool> ReadSerial1;
+        public Func<bool> ReadSerial2;
 
 		public UserPort()
 		{
-			// start up with no media connected
-			Disconnect();
-		}
-
-		public void Connect(Func<int, byte> funcPeek, Action<int, byte> actPoke, Func<ushort, byte> funcRead, Action<ushort, byte> actWrite)
-		{
-			peekMemory = funcPeek;
-			pokeMemory = actPoke;
-			readMemory = funcRead;
-			writeMemory = actWrite;
-		}
-
-		public void Disconnect()
-		{
-			peekMemory = DummyPeek;
-			pokeMemory = DummyPoke;
-			readMemory = DummyRead;
-			writeMemory = DummyWrite;
-		}
-
-		private byte DummyPeek(int addr)
-		{
-			return 0xFF;
-		}
-
-		private void DummyPoke(int addr, byte val)
-		{
-			// do nothing
-		}
-
-		private byte DummyRead(ushort addr)
-		{
-			return 0xFF;
-		}
-
-		private void DummyWrite(ushort addr, byte val)
-		{
-			// do nothing
 		}
 
 		public void HardReset()
@@ -56,24 +19,49 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			// note: this will not disconnect any attached media
 		}
 
-		public byte Peek(int addr)
+        public bool ReadAtn()
-		{
+        {
-			return peekMemory(addr);
+            return true;
-		}
+        }
 
-		public void Poke(int addr, byte val)
+        public bool ReadCounter1Buffer()
-		{
+        {
-			pokeMemory(addr, val);
+            return true;
-		}
+        }
 
-		public byte Read(ushort addr)
+        public bool ReadCounter2Buffer()
-		{
+        {
-			return readMemory(addr);
+            return true;
-		}
+        }
 
-		public void Write(ushort addr, byte val)
+        public byte ReadData()
-		{
+        {
-			writeMemory(addr, val);
+            return 0xFF;
-		}
+        }
-	}
+
+        public bool ReadFlag2()
+        {
+            return true;
+        }
+
+        public bool ReadPA2()
+        {
+            return true;
+        }
+
+        public bool ReadReset()
+        {
+            return true;
+        }
+
+        public bool ReadSerial1Buffer()
+        {
+            return true;
+        }
+
+        public bool ReadSerial2Buffer()
+        {
+            return true;
+        }
+    }
 }

BizHawk.Emulation/Computers/Commodore64/MOS/Vic.cs

@@ -105,7 +105,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		private int cycleIndex;
 		private int dataC;
 		private int dataG;
-		private int displayC;
+        private bool debugScreen;
+        private int displayC;
 		private bool displayEnable;
 		private int displayIndex;
 		private bool enableIntLightPen;
@@ -159,8 +160,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		// ------------------------------------
 
-		public Func<ushort, byte> ReadColorRam;
+		public Func<int, byte> ReadColorRam;
-		public Func<ushort, byte> ReadMemory;
+		public Func<int, byte> ReadMemory;
 	
 		// ------------------------------------
 
@@ -168,13 +169,23 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		{
 			
 			{
-				totalCycles = newCycles;
+                debugScreen = false;
+
+                totalCycles = newCycles;
 				totalLines = newLines;
 				pipeline = newPipeline;
 				cyclesPerSec = newCyclesPerSec;
 				pixelBufferDelay = 12;
 				pixelBackgroundBufferDelay = 4;
-				bufRect = new Rectangle(136 - 24, 51 - 24, 320 + 48, 200 + 48);
+
+                if (debugScreen)
+                {
+                    bufRect = new Rectangle(0, 0, totalCycles * 8, totalLines);
+                }
+                else
+                {
+                    bufRect = new Rectangle(136 - 24, 51 - 24, 320 + 48, 200 + 48);
+                }
 
 				buf = new int[bufRect.Width * bufRect.Height];
 				bufLength = buf.Length;
@@ -425,7 +436,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		{
 			
 			{
-				ushort addr = 0x3FFF;
+				int addr = 0x3FFF;
 				int cycleBAsprite0;
 				int cycleBAsprite1;
 				int cycleBAsprite2;
@@ -443,7 +454,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 					case 0x0100:
 						// fetch R
 						refreshCounter = (refreshCounter - 1) & 0xFF;
-						addr = (ushort)(0x3F00 | refreshCounter);
+						addr = (0x3F00 | refreshCounter);
 						ReadMemory(addr);
 						break;
 					case 0x0200:
@@ -452,7 +463,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 						{
 							if (badline)
 							{
-								addr = (ushort)((pointerVM << 10) | vc);
+								addr = ((pointerVM << 10) | vc);
 								dataC = ReadMemory(addr);
 								dataC |= ((int)ReadColorRam(addr) & 0xF) << 8;
 								bufferC[vmli] = dataC;
@@ -475,9 +486,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 						else
 						{
 							if (bitmapMode)
-								addr = (ushort)(rc | (vc << 3) | ((pointerCB & 0x4) << 11));
+								addr = (rc | (vc << 3) | ((pointerCB & 0x4) << 11));
 							else
-								addr = (ushort)(rc | ((dataC & 0xFF) << 3) | (pointerCB << 11));
+								addr = (rc | ((dataC & 0xFF) << 3) | (pointerCB << 11));
 						}
 						if (extraColorMode)
 							addr &= 0x39FF;
@@ -491,7 +502,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 						break;
 					case 0x0400:
 						// fetch I
-						addr = (extraColorMode ? (ushort)0x39FF : (ushort)0x3FFF);
+						addr = (extraColorMode ? 0x39FF : 0x3FFF);
 						dataG = ReadMemory(addr);
 						dataC = 0;
 						break;
@@ -504,7 +515,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 						{
 							case 0x00:
 								// fetch P
-								addr = (ushort)(0x3F8 | (pointerVM << 10) | cycleFetchSpriteIndex);
+								addr = (0x3F8 | (pointerVM << 10) | cycleFetchSpriteIndex);
 								sprites[cycleFetchSpriteIndex].pointer = ReadMemory(addr);
 								sprites[cycleFetchSpriteIndex].shiftEnable = false;
 								break;
@@ -515,7 +526,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 								if (sprites[cycleFetchSpriteIndex].dma)
 								{
 									Sprite spr = sprites[cycleFetchSpriteIndex];
-									addr = (ushort)(spr.mc | (spr.pointer << 6));
+									addr = (spr.mc | (spr.pointer << 6));
 									spr.sr <<= 8;
 									spr.sr |= ReadMemory(addr);
 									spr.mc++;
@@ -878,13 +889,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		// ------------------------------------
 
-		public bool AEC { get { return pinAEC; } }
+        public bool ReadAECBuffer() { return pinAEC; }
-		public bool BA { get { return pinBA; } }
+        public bool ReadBABuffer() { return pinBA; }
-		public bool IRQ { get { return pinIRQ; } }
+        public bool ReadIRQBuffer() { return pinIRQ; }
-
-        public bool ReadAEC() { return pinAEC; }
-        public bool ReadBA() { return pinBA; }
-        public bool ReadIRQ() { return pinIRQ; }
 
 		// ------------------------------------
 
@@ -892,7 +899,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		{
 			get
 			{
-				return (int)(totalCycles * totalLines);
+				return (totalCycles * totalLines);
 			}
 		}
 
@@ -908,15 +915,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 
 		public byte Peek(int addr)
 		{
-			return ReadRegister((ushort)(addr & 0x3F));
+			return ReadRegister((addr & 0x3F));
 		}
 
 		public void Poke(int addr, byte val)
 		{
-			WriteRegister((ushort)(addr & 0x3F), val);
+			WriteRegister((addr & 0x3F), val);
 		}
 
-		public byte Read(ushort addr)
+		public byte Read(int addr)
 		{
 			byte result;
 			addr &= 0x3F;
@@ -930,13 +937,13 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 					WriteRegister(addr, 0);
 					break;
 				default:
-					result = ReadRegister((ushort)(addr & 0x3F));
+					result = ReadRegister((addr & 0x3F));
 					break;
 			}
 			return result;
 		}
 
-		private byte ReadRegister(ushort addr)
+		private byte ReadRegister(int addr)
 		{
 			byte result = 0xFF; //unused bit value
 
@@ -1158,7 +1165,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			return result;
 		}
 
-		public void Write(ushort addr, byte val)
+		public void Write(int addr, byte val)
 		{
 			addr &= 0x3F;
 			switch (addr)
@@ -1207,7 +1214,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			}
 		}
 
-		private void WriteRegister(ushort addr, byte val)
+		private void WriteRegister(int addr, byte val)
 		{
 			switch (addr)
 			{

BizHawk.Emulation/Computers/Commodore64/Media/PRG.cs

@@ -6,11 +6,11 @@ namespace BizHawk.Emulation.Computers.Commodore64.Media
 	{
 		static public void Load(MOSPLA pla, byte[] prgFile)
 		{
-			uint length = (uint)prgFile.Length;
+			int length = prgFile.Length;
 			if (length > 2)
 			{
-				ushort addr = (ushort)(prgFile[0] | (prgFile[1] << 8));
+				int addr = (prgFile[0] | (prgFile[1] << 8));
-				uint offset = 2;
+				int offset = 2;
 				unchecked
 				{
 					while (offset < length)

BizHawk.Emulation/Computers/Commodore64/Memory.cs

@@ -1,6 +0,0 @@
-namespace BizHawk.Emulation.Computers.Commodore64
-{
-	class Memory
-	{
-	}
-}