diff --git a/BizHawk.Emulation.Cores/CPUs/MC6809/Indexed_Modes.cs b/BizHawk.Emulation.Cores/CPUs/MC6809/Indexed_Modes.cs
index 0021e13260..1477134f3f 100644
--- a/BizHawk.Emulation.Cores/CPUs/MC6809/Indexed_Modes.cs
+++ b/BizHawk.Emulation.Cores/CPUs/MC6809/Indexed_Modes.cs
@@ -125,7 +125,6 @@ namespace BizHawk.Emulation.Common.Components.MC6809
 							WR_HI_INC, IDX_EA, ADDR,
 							WR_DEC_LO, IDX_EA, B);
 
-			Console.WriteLine("here");
 			IRQS = 3;
 		}
 
diff --git a/BizHawk.Emulation.Cores/CPUs/MC6809/MC6809.cs b/BizHawk.Emulation.Cores/CPUs/MC6809/MC6809.cs
index 2686587b09..feb963cf83 100644
--- a/BizHawk.Emulation.Cores/CPUs/MC6809/MC6809.cs
+++ b/BizHawk.Emulation.Cores/CPUs/MC6809/MC6809.cs
@@ -37,7 +37,7 @@ namespace BizHawk.Emulation.Common.Components.MC6809
 		public const ushort CWAI = 26;
 		public const ushort SYNC = 27;
 		public const ushort INT_GET = 28;
-		public const ushort HALT_CHK = 29; // when in halt mode, actually check I Flag here
+		public const ushort HALT_CHK = 29;
 		public const ushort RD_INC = 30;
 		public const ushort SET_ADDR = 31;
 		public const ushort NEG = 32;
@@ -148,7 +148,7 @@ namespace BizHawk.Emulation.Common.Components.MC6809
 		// Execute instructions
 		public void ExecuteOne()
 		{
-			Console.Write(opcode_see + " ");
+			//Console.Write(opcode_see + " ");
 			switch (cur_instr[instr_pntr++])
 			{
 				case IDLE:
diff --git a/BizHawk.Emulation.Cores/Consoles/GCE/Vectrex/HW_Registers.cs b/BizHawk.Emulation.Cores/Consoles/GCE/Vectrex/HW_Registers.cs
index ebada2c06f..7c911c601c 100644
--- a/BizHawk.Emulation.Cores/Consoles/GCE/Vectrex/HW_Registers.cs
+++ b/BizHawk.Emulation.Cores/Consoles/GCE/Vectrex/HW_Registers.cs
@@ -5,15 +5,61 @@ using BizHawk.Common;
 
 namespace BizHawk.Emulation.Cores.Consoles.Vectrex
 {
+	// MOS6522 Interface
+	
+	/* Port B writes to both the PSG and the DAC simultaneously
+	 * The trick here is that bits 3 and 4 both zero represent PSG disabled
+	 * So it's easy to not interfere with the PSG
+	 * However, the DAC will always receive some input, controlled by the multiplexer and selector bits  
+	 * BIOS functions keep everything in order
+	 */
 	public partial class VectrexHawk
 	{
+		public byte dir_dac, dir_ctrl;
+
+		public byte portB_ret, portA_ret;
+
 		public byte Read_Registers(int addr)
 		{
 			byte ret = 0;
 
 			switch (addr)
 			{
-				default:
+				case 0x0:
+					ret = portB_ret;
+					break;
+				case 0x1:
+					ret = portA_ret;
+					break;
+				case 0x2:
+					ret = dir_ctrl;
+					break;
+				case 0x3:
+					ret = dir_dac;
+					break;
+				case 0x4:
+					break;
+				case 0x5:
+					break;
+				case 0x6:
+					break;
+				case 0x7:
+					break;
+				case 0x8:
+					break;
+				case 0x9:
+					break;
+				case 0xA:
+					break;
+				case 0xB:
+					break;
+				case 0xC:
+					break;
+				case 0xD:
+					break;
+				case 0xE:
+					break;
+				case 0xF:
 					break;
 			}
 			return ret;
@@ -21,9 +67,45 @@ namespace BizHawk.Emulation.Cores.Consoles.Vectrex
 
 		public void Write_Registers(int addr, byte value)
 		{
+			byte wrt_val = 0;
+
 			switch (addr)
 			{
-				default:
+				case 0x0:
+					wrt_val = (byte)(value & dir_ctrl);
+					break;
+				case 0x1:
+					wrt_val = (byte)(value & dir_dac);
+					break;
+				case 0x2:
+					dir_ctrl = value;
+					break;
+				case 0x3:
+					dir_dac = value;
+					break;
+				case 0x4:
+					break;
+				case 0x5:
+					break;
+				case 0x6:
+					break;
+				case 0x7:
+					break;
+				case 0x8:
+					break;
+				case 0x9:
+					break;
+				case 0xA:
+					break;
+				case 0xB:
+					break;
+				case 0xC:
+					break;
+				case 0xD:
+					break;
+				case 0xE:
+					break;
+				case 0xF:
 					break;
 			}
 		}
diff --git a/BizHawk.Emulation.Cores/Consoles/GCE/Vectrex/MemoryMap.cs b/BizHawk.Emulation.Cores/Consoles/GCE/Vectrex/MemoryMap.cs
index 176bc1beaa..eddf0b6f67 100644
--- a/BizHawk.Emulation.Cores/Consoles/GCE/Vectrex/MemoryMap.cs
+++ b/BizHawk.Emulation.Cores/Consoles/GCE/Vectrex/MemoryMap.cs
@@ -33,7 +33,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Vectrex
 			}
 			else if (addr < 0xD800)
 			{
-				return 0xFF;
+				return Read_Registers(addr & 0xF);
 			}
 			else if (addr < 0xE000)
 			{
@@ -67,7 +67,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Vectrex
 			}
 			else if (addr < 0xD800)
 			{
-
+				Write_Registers(addr & 0xF, value);
 			}
 			else if (addr < 0xE000)
 			{
@@ -99,7 +99,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Vectrex
 			}
 			else if (addr < 0xD800)
 			{
-				return 0xFF;
+				return Read_Registers(addr & 0xF);
 			}
 			else if (addr < 0xE000)
 			{