diff --git a/BizHawk.Emulation/Computers/Commodore64/C64.Core.cs b/BizHawk.Emulation/Computers/Commodore64/C64.Core.cs
index c5ca386b37..f638daee42 100644
--- a/BizHawk.Emulation/Computers/Commodore64/C64.Core.cs
+++ b/BizHawk.Emulation/Computers/Commodore64/C64.Core.cs
@@ -96,15 +96,15 @@ namespace BizHawk.Emulation.Computers.Commodore64
 			chips.HardReset();
 		}
 
-		private byte Peek(int addr)
-		{
-			return chips.cpu.Peek(addr);
-		}
+		//private byte Peek(int addr)
+		//{
+		//    return chips.cpu.Peek(addr);
+		//}
 
-		private void Poke(int addr, byte val)
-		{
-			chips.cpu.Poke(addr, val);
-		}
+		//private void Poke(int addr, byte val)
+		//{
+		//    chips.cpu.Poke(addr, val);
+		//}
 
 		// ------------------------------------
 	}
diff --git a/BizHawk.Emulation/Computers/Commodore64/C64.cs b/BizHawk.Emulation/Computers/Commodore64/C64.cs
index 423e64ac9a..36ea23dd8a 100644
--- a/BizHawk.Emulation/Computers/Commodore64/C64.cs
+++ b/BizHawk.Emulation/Computers/Commodore64/C64.cs
@@ -17,12 +17,12 @@ namespace BizHawk.Emulation.Computers.Commodore64
 		{
 			inputFile = rom;
 			extension = romextension;
-			SetupMemoryDomains();
 			CoreOutputComm = new CoreOutputComm();
 			CoreInputComm = new CoreInputComm();
 			Init(Region.PAL);
 			cyclesPerFrame = (uint)chips.vic.CyclesPerFrame;
 			CoreOutputComm.UsesDriveLed = true;
+			SetupMemoryDomains();
 		}
 
 		// internal variables
@@ -117,8 +117,14 @@ namespace BizHawk.Emulation.Computers.Commodore64
 
 		private void SetupMemoryDomains()
 		{
+			// 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>(Peek), new Action<int, byte>(Poke)));
+			domains.Add(new MemoryDomain("System Bus", 0x10000, Endian.Little, new Func<int, byte>(chips.cpu.Peek), new Action<int, byte>(chips.cpu.Poke)));
+			domains.Add(new MemoryDomain("RAM", 0x10000, Endian.Little, new Func<int, byte>(chips.ram.Peek), new Action<int, byte>(chips.ram.Poke)));
+			domains.Add(new MemoryDomain("CIA0", 0x10, Endian.Little, new Func<int, byte>(chips.cia0.Peek), new Action<int, byte>(chips.cia0.Poke)));
+			domains.Add(new MemoryDomain("CIA1", 0x10, Endian.Little, new Func<int, byte>(chips.cia1.Peek), new Action<int, byte>(chips.cia1.Poke)));
+			domains.Add(new MemoryDomain("VIC", 0x40, Endian.Little, new Func<int, byte>(chips.vic.Peek), new Action<int, byte>(chips.vic.Poke)));
+			domains.Add(new MemoryDomain("SID", 0x20, Endian.Little, new Func<int, byte>(chips.sid.Peek), new Action<int, byte>(chips.sid.Poke)));
 			memoryDomains = domains.AsReadOnly();
 		}
 	}
diff --git a/BizHawk.Emulation/Computers/Commodore64/MOS/MOS6510.cs b/BizHawk.Emulation/Computers/Commodore64/MOS/MOS6510.cs
index 9d8aee1c80..edac0a3973 100644
--- a/BizHawk.Emulation/Computers/Commodore64/MOS/MOS6510.cs
+++ b/BizHawk.Emulation/Computers/Commodore64/MOS/MOS6510.cs
@@ -26,6 +26,11 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 		private bool pinNMI;
 		private bool pinRDY;
 		private byte portDir;
+		private bool unusedPin0;
+		private bool unusedPin1;
+		private uint unusedPinTTL0;
+		private uint unusedPinTTL1;
+		private uint unusedPinTTLCycles;
 
 		// ------------------------------------
 
@@ -42,6 +47,11 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 			// configure data port defaults
 			portDir = 0x2F;
 			SetPortData(0x37);
+
+			// todo: verify this value (I only know that unconnected bits fade after a number of cycles)
+			unusedPinTTLCycles = 40;
+			unusedPinTTL0 = 0;
+			unusedPinTTL1 = 0;
 		}
 
 		public void HardReset()
@@ -71,6 +81,17 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 				cpu.IRQ = !pinIRQ;
 				cpu.ExecuteOne();
 			}
+
+			// process unused pin TTL
+			if (unusedPinTTL0 == 0)
+				unusedPin0 = false;
+			else
+				unusedPinTTL0--;
+
+			if (unusedPinTTL1 == 0)
+				unusedPin1 = false;
+			else
+				unusedPinTTL1--;
 		}
 
 		private void UpdatePins()
@@ -102,8 +123,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 				portDir = val;
 			else if (addr == 0x0001)
 				SetPortData(val);
-			else
-				chips.pla.Poke(addr, val);
+			chips.pla.Poke(addr, val);
 		}
 
 		public byte Read(ushort addr)
@@ -126,8 +146,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 				PortDirection = val;
 			else if (addr == 0x0001)
 				PortData = val;
-			else
-				chips.pla.Write(addr, val);
+			chips.pla.Write(addr, val);
 		}
 
 		// ------------------------------------
@@ -164,7 +183,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 				result |= pinCassetteOutput ? (byte)0x08 : (byte)0x00;
 				result |= pinCassetteButton ? (byte)0x10 : (byte)0x00;
 				result |= pinCassetteMotor ? (byte)0x20 : (byte)0x00;
-
+				result |= unusedPin0 ? (byte)0x40 : (byte)0x00;
+				result |= unusedPin1 ? (byte)0x80 : (byte)0x00;
 				return result;
 			}
 			set
@@ -195,6 +215,11 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
 				chips.pla.HiRam = pinHiram;
 				chips.pla.Charen = pinCharen;
 			}
+
+			unusedPin0 = ((val & 0x40) != 0);
+			unusedPin1 = ((val & 0x80) != 0);
+			unusedPinTTL0 = unusedPinTTLCycles;
+			unusedPinTTL1 = unusedPinTTLCycles;
 		}
 
 		// ------------------------------------