diff --git a/src/rdp.cpp b/src/rdp.cpp
index 15b397f..d6701fb 100644
--- a/src/rdp.cpp
+++ b/src/rdp.cpp
@@ -744,6 +744,11 @@ static void rdp_set_color_image(uint32_t w1, uint32_t w2)
 	rdpFbSize		= (w1 >> 19) & 0x3;
 	rdpFbWidth	= (w1 & 0x3ff) + 1;
 	rdpFbAddress	= w2 & 0x0ffffff;
+
+	int start = rdpFbAddress >> 2;
+	for (int i = 0; i < 4; ++i) {
+		rdram[start++] = fingerprint[i];
+	}
 }
 
 /*****************************************************************************/
diff --git a/src/rgl.cpp b/src/rgl.cpp
index 552dc94..077157b 100644
--- a/src/rgl.cpp
+++ b/src/rgl.cpp
@@ -1159,19 +1159,33 @@ void rglClearChunks()
 
 void rglUpdate()
 {
-  int i;
-  
-  if (old_vi_origin == vi_origin) {
-    //printf("same\n");
-    return;
-  }
-  old_vi_origin = vi_origin;
+	int i;
 
-  DUMP("updating vi_origin %x vi_hstart %d vi_vstart %d\n",
-         vi_origin, *gfx.VI_H_START_REG, *gfx.VI_V_START_REG);
+	if (old_vi_origin == vi_origin) {
+		//printf("same\n");
+		return;
+	}
+	old_vi_origin = vi_origin;
+
+	DUMP("updating vi_origin %x vi_hstart %d vi_vstart %d\n",
+		vi_origin, *gfx.VI_H_START_REG, *gfx.VI_V_START_REG);
+
+	glPolygonMode(GL_FRONT_AND_BACK, wireframe ? GL_LINE : GL_FILL);
+
+	for (i = nbRBuffers - 1; i >= 0; i--) {
+		int start = rBuffers[i].addressStart >> 2;
+		for (int j = 0; j < 4; ++j) {
+			if (rdram[start++] != fingerprint[j]) {
+				rBuffers[i].flags |= RGL_RB_RAMMOD;
+				break;
+			}
+			else
+			{
+				rBuffers[i].flags &= ~RGL_RB_RAMMOD;
+			}
+		}
+	}
 
-  glPolygonMode(GL_FRONT_AND_BACK, wireframe? GL_LINE : GL_FILL);
-  
   if (no_dlists)
 	  rglDisplayCFB();
   else {
diff --git a/src/rgl.h b/src/rgl.h
index dd19ba5..3b8a227 100644
--- a/src/rgl.h
+++ b/src/rgl.h
@@ -59,6 +59,8 @@ extern PFNGLMULTITEXCOORD2FPROC xglMultiTexCoord2f;
 
 //#define RGL_USE_GLUT
 
+const int fingerprint[4] = { 2, 6, 4, 3 };
+
 struct rglSettings_t {
   int hiresFb;
   int resX, resY;
diff --git a/src/rgl_tiles.cpp b/src/rgl_tiles.cpp
index ee09ec4..e0cc93a 100644
--- a/src/rgl_tiles.cpp
+++ b/src/rgl_tiles.cpp
@@ -208,6 +208,7 @@ void rglTile(rdpTile_t & tile, rglTile_t & rtile, int recth)
       //while (0) {
       CIRCLEQ_FOREACH(rglRenderBuffer_t, buffer, &rBufferHead, link) {
         //if (buffer->flags & RGL_RB_DEPTH) continue;
+		  if (buffer->flags & RGL_RB_RAMMOD) continue;
         if (buffer->area.xh != 8192)
           buffer->addressStop = buffer->addressStart + buffer->line * ((buffer->area.yl >>2)+1);