diff --git a/core/hw/pvr/ta.cpp b/core/hw/pvr/ta.cpp
index bb0ac5425..23c4d3db0 100644
--- a/core/hw/pvr/ta.cpp
+++ b/core/hw/pvr/ta.cpp
@@ -264,7 +264,7 @@ void ta_vtx_ListCont()
 void ta_vtx_ListInit()
 {
 	SetCurrentTARC(TA_ISP_BASE);
-	ta_tad.Clear();
+	ta_tad.ClearPartial();
 
 	ta_cur_state=TAS_NS;
 }
diff --git a/core/hw/pvr/ta_ctx.cpp b/core/hw/pvr/ta_ctx.cpp
index d5d22b4e9..2017f151f 100644
--- a/core/hw/pvr/ta_ctx.cpp
+++ b/core/hw/pvr/ta_ctx.cpp
@@ -32,8 +32,7 @@ void SetCurrentTARC(u32 addr)
 		
 		//clear context
 		ta_ctx=0;
-		ta_tad.thd_data=0;
-		ta_tad.thd_root=0;
+		ta_tad.Reset(0);
 	}
 }
 
diff --git a/core/hw/pvr/ta_ctx.h b/core/hw/pvr/ta_ctx.h
index 8aa34ed31..5fcfb595a 100644
--- a/core/hw/pvr/ta_ctx.h
+++ b/core/hw/pvr/ta_ctx.h
@@ -46,11 +46,29 @@ struct  tad_context
 {
 	u8* thd_data;
 	u8* thd_root;
+	u8* thd_old_data;
 
 	void Clear()
 	{
-		thd_data=thd_root;
+		thd_old_data = thd_data = thd_root;
 	}
+
+	void ClearPartial()
+	{
+		thd_old_data = thd_data;
+		thd_data = thd_root;
+	}
+	
+	u8* End()
+	{
+		return thd_data == thd_root ? thd_old_data : thd_data;
+	}
+
+	void Reset(u8* ptr)
+	{
+		thd_data = thd_root = thd_old_data = ptr;
+	}
+
 };
 
 struct rend_context
@@ -127,11 +145,11 @@ struct TA_context
 	void MarkRend()
 	{
 		rend.proc_start = rend.proc_end;
-		rend.proc_end = tad.thd_data;
+		rend.proc_end = tad.End();
 	}
 	void Alloc()
 	{
-		tad.thd_root=tad.thd_data=(u8*)malloc(2*1024*1024);
+		tad.Reset((u8*)malloc(2*1024*1024));
 
 		rend.verts.InitBytes(1024*1024,&rend.Overrun); //up to 1 mb of vtx data/frame = ~ 38k vtx/frame
 		rend.idx.Init(60*1024,&rend.Overrun);			//up to 60K indexes ( idx have stripification overhead )