diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/TENGEN-800032.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/TENGEN-800032.cs
index fc0bc7c16e..100d75070c 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/TENGEN-800032.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/TENGEN-800032.cs
@@ -25,6 +25,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 		bool irq_pending, irq_enable;
 		bool irq_mode;
 		bool irq_reload_pending;
+		int separator_counter;
 
 
 		public override void Dispose()
@@ -51,6 +52,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 			ser.Sync("irq_enable", ref irq_enable);
 			ser.Sync("irq_mode", ref irq_mode);
 			ser.Sync("irq_reload_pending", ref irq_reload_pending);
+			ser.Sync("separator_counter", ref separator_counter);
 
 			if (ser.IsReader)
 				Sync();
@@ -63,7 +65,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 				case "MAPPER064":
 					break;
 				case "TENGEN-800032":
-					AssertPrg(64,128); AssertChr(64,128); AssertVram(0); AssertWram(00);
+					AssertPrg(64, 128); AssertChr(64, 128); AssertVram(0); AssertWram(00);
 					break;
 				default:
 					return false;
@@ -170,7 +172,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 
 				case 0x4001:
 					irq_mode = value.Bit(0);
-					if(irq_mode) irq_countdown = 12;
+					if (irq_mode) irq_countdown = 12;
 					irq_reload_pending = true;
 					break;
 
@@ -241,27 +243,34 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 
 		public override void ClockPPU()
 		{
+			if (separator_counter > 0)
+				separator_counter--;
+
 			if (irq_countdown > 0)
 			{
-			    irq_countdown--;
-			    if (irq_countdown == 0)
-			    {
-			        ClockIRQ();
-					if (irq_mode)
-						irq_countdown = 12;
-			    }
+				irq_countdown--;
+				if (irq_countdown == 0)
+				{
+					ClockIRQ();
+				}
 			}
 		}
 
-
 		public override void AddressPPU(int addr)
 		{
 			int a12 = (addr >> 12) & 1;
 			bool rising_edge = (a12 == 1 && a12_old == 0);
 			if (rising_edge)
 			{
-				//this number is totally guessed to make klax work
-				irq_countdown = 25;
+				if (separator_counter > 0)
+				{
+					separator_counter = 15;
+				}
+				else
+				{
+					separator_counter = 15;
+					irq_countdown = 11;
+				}
 			}
 
 			a12_old = a12;
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
index 96fe6dff0b..b62dea5a98 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
@@ -39,7 +39,6 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 					return 0xFF;
 
 				nes.board.AddressPPU(addr);
-				
 				return nes.board.ReadPPU(addr);
 			}
 
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.regs.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.regs.cs
index ea9f7ff32e..996be7b887 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.regs.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.regs.cs
@@ -436,16 +436,13 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 					ppur.install_latches();
 					//nes.LogLine("addr wrote vt = {0}, ht = {1}", ppur._vt, ppur._ht);
 
-					//zero 03-mar-2012 - this broke chu chu rocket.
-					//its actually a terrible idea, so dont put it back.
-					//the address isnt observed by the board till it gets clocked by a read or write.
-					//nes.board.AddressPPU(ppur.get_2007access());
+					//normally the address isnt observed by the board till it gets clocked by a read or write.
+					//but maybe thats just because a ppu read/write shoves it on the address bus
+					//apparently this shoves it on the address bus, too, or else blargg's mmc3 tests dont pass
+					nes.board.AddressPPU(ppur.get_2007access());
 				}
 
 				vtoggle ^= true;
-
-				int addr = ppur.get_2007access() & 0x3FFF;
-				nes.board.AddressPPU(addr);
 			}
 			byte read_2006() { return PPUGenLatch; }
 
@@ -477,8 +474,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 
 				ppur.increment2007(ppur.status.rendering && reg_2001.PPUON, reg_2000.vram_incr32 != 0);
 
-				addr = ppur.get_2007access() & 0x3FFF;
-				nes.board.AddressPPU(addr);
+				//see comments in $2006
+				nes.board.AddressPPU(ppur.get_2007access()); 
 			}
 			byte read_2007()
 			{
@@ -499,8 +496,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 
 				ppur.increment2007(ppur.status.rendering && reg_2001.PPUON, reg_2000.vram_incr32 != 0);
 
-				addr = ppur.get_2007access() & 0x3FFF;
-				nes.board.AddressPPU(addr);
+				//see comments in $2006
+				nes.board.AddressPPU(ppur.get_2007access()); 
 				
 				return ret;
 			}
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.run.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.run.cs
index 1dc84848ae..ece69f57f6 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.run.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.run.cs
@@ -413,6 +413,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 
 							//garbage nametable fetches + scroll resets
 							int garbage_todo = 2;
+							ppubus_read(ppur.get_ntread(),true);
 							if (reg_2001.PPUON)
 							{
 								if (sl == 0 && ppur.status.cycle == 304)
@@ -433,6 +434,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 							}
 							if (realSprite) runppu(garbage_todo);
 
+							ppubus_read(ppur.get_atread(), true); //at or nt?
 							if (realSprite) runppu(kFetchTime);
 
 							//TODO - fake sprites should not come through ppubus_read but rather peek it