diff --git a/Makefile b/Makefile
index 4eda78b..7ef0a7e 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,7 @@ IMAGES = common \
 		gpu/texture-overflow \
 		gpu/mask-bit \
 		gpu/gp0-e1 \
+		gpu/vram-to-vram-overlap \
 		gte-fuzz \
 		spu/test \
 		spu/stereo \
diff --git a/README.md b/README.md
index dd7c9dc..014ac8d 100644
--- a/README.md
+++ b/README.md
@@ -4,22 +4,23 @@ Collection of PlayStation 1 tests for emulator development and hardware verifica
 
 ## Tests
 
-Name                 | Description
----------------------|------------
-gpu/bandwidth        | Measure GPU/VRAM bandwidth
-gpu/benchmark        | Simple GPU test to benchmark rasteriser
-gpu/quad             | Semi-transparent polygon commands - for testing fill rules and transparency handling
-gpu/transparency     | Draws rectangles with 4 semi-transparent blending modes
-gpu/triangle         | Draws Gouroud shaded equilateral triangle 
-gpu/lines            | Draws lines using different modes - for verifying Bresenham implementation, color blending, polyline handling
-gpu/rectangles       | Draws all combinations of Rectangle commands
-gpu/texture-overflow | Draws textured rectangle with UV overflowing VRAM width
-gpu/mask-bit         | Check Mask bit behavior during VRAM copy operations
-gpu/gp0-e1           | Check if GP0_E1, GPUSTAT and polygon render uses the same register internally
-gte-fuzz             | Executes GTE opcodes with random parameters, can be used to verify against real console
-spu/test             | Check SPU behavior (data is lost randomly on 32bit access, ok on 16bit)
-spu/stereo           | Play samples on first two voices 
-timers               | Run Timer0,1,2 using various clock sources and sync modes and time them using busy loops and vblank interrupt
+Name                     | Description
+-------------------------|------------
+gpu/bandwidth            | Measure GPU/VRAM bandwidth
+gpu/benchmark            | Simple GPU test to benchmark rasteriser
+gpu/quad                 | Semi-transparent polygon commands - for testing fill rules and transparency handling
+gpu/transparency         | Draws rectangles with 4 semi-transparent blending modes
+gpu/triangle             | Draws Gouroud shaded equilateral triangle 
+gpu/lines                | Draws lines using different modes - for verifying Bresenham implementation, color blending, polyline handling
+gpu/rectangles           | Draws all combinations of Rectangle commands
+gpu/texture-overflow     | Draws textured rectangle with UV overflowing VRAM width
+gpu/mask-bit             | Check Mask bit behavior during VRAM copy operations
+gpu/gp0-e1               | Check if GP0_E1, GPUSTAT and polygon render uses the same register internally
+gpu/vram-to-vram-overlap | Test GP0(80) VRAM-VRAM copy behaviour in overlapping rects
+gte-fuzz                 | Executes GTE opcodes with random parameters, can be used to verify against real console
+spu/test                 | Check SPU behavior (data is lost randomly on 32bit access, ok on 16bit)
+spu/stereo               | Play samples on first two voices 
+timers                   | Run Timer0,1,2 using various clock sources and sync modes and time them using busy loops and vblank interrupt
 
 Note: Make sure your PS-EXE loaded does set default value for Stack Pointer - these .exes has SP set to 0.
 
@@ -39,6 +40,7 @@ diffvram             | Diff two images and write diff png if image contents aren
 <img src="gpu/transparency/vram.png" height="256">
 <img src="gpu/rectangles/vram.png" height="256">
 <img src="gpu/texture-overflow/vram.png" height="256">
+<img src="gpu/vram-to-vram-overlap/vram.png" height="256">
 
 ## Build
 
diff --git a/common/gpu.c b/common/gpu.c
index 91b3abc..ad8deb5 100644
--- a/common/gpu.c
+++ b/common/gpu.c
@@ -6,7 +6,7 @@ DRAWENV draw;
 
 void setResolution(int w, int h) {
     SetDefDispEnv(&disp, 0, 0, w, h);
-    SetDefDrawEnv(&draw, 0, 0, w, h);
+    SetDefDrawEnv(&draw, 0, 0, 1024, 512);
 
     PutDispEnv(&disp);
     PutDrawEnv(&draw);
@@ -106,3 +106,19 @@ uint32_t vramGet(int x, int y) {
 
     return readGPU();
 }
+
+void vramToVramCopy(int srcX, int srcY, int dstX, int dstY, int w, int h) 
+{
+    VRAM2VRAM buf = {0};
+    setcode(&buf, 0x80); // VRAM -> VRAM
+    setlen(&buf, 4);
+    
+    buf.x0 = srcX;
+    buf.y0 = srcY;
+    buf.x1 = dstX;
+    buf.y1 = dstY;
+    buf.w = w;
+    buf.h = h;
+
+    DrawPrim(&buf);
+}
diff --git a/common/gpu.h b/common/gpu.h
index 69675b8..7867909 100644
--- a/common/gpu.h
+++ b/common/gpu.h
@@ -36,6 +36,7 @@ void writeGP1(uint8_t cmd, uint32_t data);
 uint32_t readGPU();
 void vramPut(int x, int y, uint16_t pixel);
 uint32_t vramGet(int x, int y);
+void vramToVramCopy(int srcX, int srcY, int dstX, int dstY, int w, int h);
 
 #ifdef __cplusplus
 }
diff --git a/gpu/vram-to-vram-overlap/Makefile b/gpu/vram-to-vram-overlap/Makefile
new file mode 100644
index 0000000..54e6e19
--- /dev/null
+++ b/gpu/vram-to-vram-overlap/Makefile
@@ -0,0 +1,3 @@
+include ../../common-test.mk
+
+TARGET = vram-to-vram-overlap.elf
\ No newline at end of file
diff --git a/gpu/vram-to-vram-overlap/font.c b/gpu/vram-to-vram-overlap/font.c
new file mode 100644
index 0000000..abf50c0
--- /dev/null
+++ b/gpu/vram-to-vram-overlap/font.c
@@ -0,0 +1,67 @@
+#include <common.h>
+#include <psxetc.h>
+#include <string.h>
+
+const int fontPosX = 960;
+const int fontPosY = 0;
+
+int fontCharX = 0;
+int fontCharY = 0;
+
+// TODO: refactor font handling to use SDK functions
+void FntInit() {
+    FntLoad(fontPosX, fontPosY);
+}
+
+void FntPos(int x, int y) {
+	fontCharX = x;
+	fontCharY = y;
+}
+
+void FntChar(char c) {
+	if (c == '\n') {
+		fontCharX = 0;
+		fontCharY += 8;
+		return;
+	}
+	if (c >= ' ') {
+		DR_TPAGE e;
+		unsigned short texpage = getTPage(/* bits */ 0, /* semi transparency */ 0, fontPosX, fontPosY);
+		setDrawTPage(&e, /* Drawing to display area */ 1, /* dithering */ 1, texpage);
+		DrawPrim(&e);
+
+		if (c >= 96) {
+			 c &= ~(1<<5); // To lower
+		}
+		char pos = c - 33;
+		int u = pos%16;
+		int v = pos/16;
+
+		SPRT_8 t;
+		setSprt8(&t);
+		setXY0(&t, fontCharX, fontCharY);
+		setUV0(&t, u*8, v*8);
+		setClut(&t, fontPosX, 32);
+		setRGB0(&t, 255, 255, 255);
+		
+		DrawPrim(&t);
+	}
+
+	fontCharX += 8;
+	if (fontCharX > 1024) {
+		fontCharX = 0;
+		fontCharY += 8;
+	}
+}
+
+void FntPrintf(const char* format, ...) {
+	char buffer[256];
+	va_list args;
+	va_start(args, format);
+	vsprintf(buffer, format, args);
+
+	int len = strlen(buffer);
+	for (int i = 0; i<len; i++) FntChar(buffer[i]);
+
+	va_end(args);
+}
diff --git a/gpu/vram-to-vram-overlap/font.h b/gpu/vram-to-vram-overlap/font.h
new file mode 100644
index 0000000..f9110b7
--- /dev/null
+++ b/gpu/vram-to-vram-overlap/font.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void FntInit();
+void FntPos(int x, int y);
+void FntChar(char c);
+void FntPrintf(const char* format, ...);
+
+#ifdef __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/gpu/vram-to-vram-overlap/main.cpp b/gpu/vram-to-vram-overlap/main.cpp
new file mode 100644
index 0000000..f50d523
--- /dev/null
+++ b/gpu/vram-to-vram-overlap/main.cpp
@@ -0,0 +1,137 @@
+#include <common.h>
+#include "font.h"
+
+// 24 bit to 15 bit value
+constexpr uint16_t rgb(uint8_t r, uint8_t g, uint8_t b) {
+    uint16_t c = 0;
+    c |= ((r >> 3) & 0x1f);
+    c |= ((g >> 3) & 0x1f) << 5;
+    c |= ((b >> 3) & 0x1f) << 10;
+    return c;
+}
+
+constexpr uint16_t randomColor(int c) {
+    rgb(64+(c*432)%192, 64+(c*127)%192, 64+(c*941)%192);
+}
+
+// Write sizexsize rect to vram
+void writeRect(int dstX, int dstY, int size) {
+    for (int y = 0; y<size; y++) {
+        for (int x = 0; x<size; x++) {
+            vramPut(dstX + x, dstY + y, randomColor(y * 32 + x));
+        }   
+    }
+}
+
+void line(int sx, int sy, int ex, int ey) {
+    LINE_F2 l;
+    setLineF2(&l);
+    setRGB0(&l, 255, 255, 255);
+
+    l.x0 = sx;
+    l.y0 = sy;
+    l.x1 = ex;
+    l.y1 = ey;
+
+    DrawPrim(&l);
+}
+
+constexpr int SIZES = 6 + 3;
+constexpr int sizes[SIZES] = {
+    2, 8, 15, 16, 31, 32, 
+    32, // x + 1
+    32, // y + 1
+    32, // x + 1, y + 1
+};
+
+const int COLS = 10;
+const int CELL_SIZE = 48;
+const int MARGIN = 4;
+
+void drawDebugInfo() {
+    // Draw grid, vertical lines
+    for (int size = 0; size < SIZES + 1; size++) {
+        line(
+            0, size * CELL_SIZE, 
+            CELL_SIZE * COLS, size * CELL_SIZE
+        );
+    }
+    // Horizontal
+    for (int i = 0; i<COLS + 1; i++) {
+        line(
+            i * CELL_SIZE, 0, 
+            i * CELL_SIZE, SIZES * CELL_SIZE
+        );
+    }
+
+    // Labels
+    for (int testCase = 0; testCase < SIZES; testCase++) {
+        for (int i = 0; i<COLS; i++) {
+            if (i == 0) {
+                FntPos(i * CELL_SIZE + 4, testCase * CELL_SIZE + 12);
+                FntPrintf("BLOCK\n\n  %2d\n ", sizes[testCase]);
+                if (testCase == 6) FntPrintf("x+1");
+                if (testCase == 7) FntPrintf("y+1");
+                if (testCase == 8) FntPrintf("xy+1");
+            } else {
+                int x = (i-1)%3 - 1;
+                int y = (i-1)/3 - 1;
+                FntPos(i * CELL_SIZE + 4, (testCase + 1) * CELL_SIZE - 10);
+                FntPrintf("%2d:%d", x, y);
+            }
+        }
+    }
+}
+
+#define DRAW_DEBUG
+
+int main() {
+    initVideo(320, 240);
+    printf("\ngpu/vram-to-vram-overlap\n");
+
+    setMaskBitSetting(false, false);
+    clearScreen();
+
+#ifdef DRAW_DEBUG
+    FntInit();
+    drawDebugInfo();
+#endif
+        
+    // Draw test data
+    for (int testCase = 0; testCase < SIZES; testCase++) {
+        for (int i = 1; i<COLS; i++) {
+            writeRect(i * CELL_SIZE + MARGIN, testCase * CELL_SIZE + MARGIN, sizes[testCase]);
+            writeGP0(1, 0);
+        }
+    }
+        
+    // Run test itself - copy data in different configurations
+    for (int testCase = 0; testCase < SIZES; testCase++) {
+        int size = sizes[testCase];
+        int xOffset = 0;
+        int yOffset = 0;
+
+        if (testCase == 6) {xOffset += 1;}
+        if (testCase == 7) {yOffset += 1;}
+        if (testCase == 8) {xOffset += 1; yOffset += 1;}
+
+        int i = 1;
+        for (int y = -1; y <= 1; y++) {
+            for (int x = -1; x <= 1; x++) {
+                int srcX = xOffset + i        * CELL_SIZE + MARGIN;
+                int srcY = yOffset + testCase * CELL_SIZE + MARGIN;
+                int dstX = xOffset + i        * CELL_SIZE + MARGIN + x;
+                int dstY = yOffset + testCase * CELL_SIZE + MARGIN + y;
+                
+                vramToVramCopy(srcX, srcY, dstX, dstY, size, size);
+                writeGP0(1, 0);
+                i++;
+            }   
+        }
+    }
+    
+    for (;;) {
+        VSync(0);
+    }
+    return 0;
+}
diff --git a/gpu/vram-to-vram-overlap/vram.png b/gpu/vram-to-vram-overlap/vram.png
new file mode 100644
index 0000000..cff8e77
Binary files /dev/null and b/gpu/vram-to-vram-overlap/vram.png differ