diff --git a/sources/PPU/Background.cpp b/sources/PPU/Background.cpp
index 333b84d..dc50328 100644
--- a/sources/PPU/Background.cpp
+++ b/sources/PPU/Background.cpp
@@ -62,12 +62,12 @@ namespace ComSquare::PPU
 				color = getRealColor(palette[reference]);
 				if (tileData.tilePriority == this->priority)
 					this->buffer[pos.x][pos.y] = color;
+				if (index == 7 || this->_bpp == 8) {
+					index = 0;
+					graphicAddress += 2;
+				}
 				index++;
 				pos.x++;
-				if (index == (8 / this->_bpp) - 1) {
-					index = 0;
-					graphicAddress++;
-				}
 			}
 			index = 0;
 			pos.x -= this->_characterSize.x;
@@ -83,25 +83,33 @@ namespace ComSquare::PPU
 		for (int i = 0; i < 0xF; i++) {
 			palette[i] = this->_cgram->read_internal(addr);
 			palette[i] += this->_cgram->read_internal(addr + 1) << 8U;
+			addr += 2;
 		}
 		return palette;
 	}
 
 	uint8_t Background::getTilePixelReference(uint16_t addr, int nb)
 	{
-		uint8_t reference = this->_vram->read_internal(addr);
+		uint8_t highByte = this->_vram->read_internal(addr % VRAMSIZE);
+		uint8_t lowByte = this->_vram->read_internal((addr + 1) % VRAMSIZE);
+		uint8_t secondHightByte;
+		uint8_t secondLowByte;
+		uint8_t result = 0;
+		// C000
 
 		switch (this->_bpp) {
 		case 8:
-			return reference;
+			return highByte;
 		case 4:
-			return (reference & (0xFU << ((1 - nb) * 4U))) >> (1 - nb) * 4U;
+			secondHightByte =  this->_vram->read_internal((addr + 32) % VRAMSIZE);
+			secondLowByte = this->_vram->read_internal((addr + 33) %VRAMSIZE);
+			result = (((secondLowByte & (1U << (7U - nb))) + ((secondHightByte & (1U << (7U - nb))) << 1U)) << 2U) >> (7U - nb - 2);
 		case 2:
-			return (reference & (0x3U << ((3 - nb) * 2U))) >> (3 - nb) * 2U;
+			result += ((lowByte & (1U << (7U - nb))) + ((highByte & (1U << (7U - nb))) << 1U)) >> (7U - nb - 1);
 		default:
 			break;
 		}
-		return 0;
+		return result;
 	}
 
 	void Background::drawBasicTileMap(uint16_t baseAddress, Vector2<int> offset)
@@ -113,8 +121,8 @@ namespace ComSquare::PPU
 		while (vramAddress < 0x800 + baseAddress) {
 			tileMapValue = this->_vram->read_internal(vramAddress);
 			tileMapValue += this->_vram->read_internal(vramAddress + 1) << 8U;
-			vramAddress += 2;
 			drawBgTile(tileMapValue, {(pos.x * this->_characterSize.x) + offset.x, (pos.y * this->_characterSize.y) + offset.y});
+			vramAddress += 2;
 			if (pos.x % 31 == 0 && pos.x) {
 				pos.y++;
 				pos.x = 0;
@@ -124,5 +132,10 @@ namespace ComSquare::PPU
 		}
 	}
 
+	void Background::setTileMapStartAddress(uint16_t address)
+	{
+		this->_TileMapStartAddress = address;
+	}
+
 
 }
\ No newline at end of file
diff --git a/sources/PPU/Background.hpp b/sources/PPU/Background.hpp
index 897230f..719770f 100644
--- a/sources/PPU/Background.hpp
+++ b/sources/PPU/Background.hpp
@@ -46,6 +46,8 @@ namespace ComSquare::PPU
 		Background(ComSquare::PPU::PPU &_ppu, int backGroundNumber, bool hasPriority);
 		//! @brief Render a background on the screen
 		void renderBackground(void);
+		//! @brief Set the tilemap start address
+		void setTileMapStartAddress(uint16_t address);
 	};
 }
 
diff --git a/sources/PPU/PPU.cpp b/sources/PPU/PPU.cpp
index fa371ea..0c094cd 100644
--- a/sources/PPU/PPU.cpp
+++ b/sources/PPU/PPU.cpp
@@ -15,9 +15,9 @@
 namespace ComSquare::PPU
 {
 	PPU::PPU(Renderer::IRenderer &renderer):
-		vram(new Ram::Ram(65536, ComSquare::VRam, "VRAM")),
-		oamram(new Ram::Ram(544, ComSquare::OAMRam, "OAMRAM")),
-		cgram(new Ram::Ram(512, ComSquare::CGRam, "CGRAM")),
+		vram(new Ram::Ram(VRAMSIZE, ComSquare::VRam, "VRAM")),
+		oamram(new Ram::Ram(OAMRAMSIZE, ComSquare::OAMRam, "OAMRAM")),
+		cgram(new Ram::Ram(CGRAMSIZE, ComSquare::CGRam, "CGRAM")),
 		_renderer(renderer),
 		_backgrounds{
 			Background(*this, 1, false),
@@ -31,13 +31,105 @@ namespace ComSquare::PPU
 		}
 	{
 		this->_registers._isLowByte = true;
-		for (int i = 0; i < 512; i++) {
+		/*for (int i = 0; i < 512; i++) {
 			this->cgram->write_internal(i, random() % 255);
+		}*/
+
+		//colors for the cgram
+		this->cgram->write_internal(2, 0xE0);
+		this->cgram->write_internal(3, 0x7F);
+		this->cgram->write_internal(4, 0x1F);
+		this->cgram->write_internal(6, 0xFF);
+		this->cgram->write_internal(7, 0x03);
+		this->cgram->write_internal(66, 0xE0);
+		this->cgram->write_internal(67, 0x7F);
+
+		//tiles
+		int vram_test[] = {
+			00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,
+0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,
+00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff,
+00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff,
+03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0xff,0xff,0xff,0xff,
+0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xff,0xff,0xff,0xff,
+00,0xc0,0x00,0xe0,0x00,0x70,0x00,0x38,0x00,0x1c,0x00,0x0e,0x00,0x07,0x00,0x03,
+00,0x03,0x00,0x07,0x00,0x0e,0x00,0x1c,0x00,0x38,0x00,0x70,0x00,0xe0,0x00,0xc0,
+00,0x07,0x00,0x0f,0x00,0x18,0x00,0x30,0x00,0x60,0x00,0xc0,0x00,0xc0,0x00,0xc0,
+00,0xe0,0x00,0xf0,0x00,0x18,0x00,0x0c,0x00,0x06,0x00,0x03,0x00,0x03,0x00,0x03,
+0xfc,0x00,0xf8,0x00,0xf0,0x00,0xe0,0x00,0xc0,0x00,0x80,0x00,0x00,0x00,0x00,0x00,
+0x3f,0x00,0x1f,0x00,0x0f,0x00,0x07,0x00,0x03,0x00,0x01,0x00,0x00,0x00,0x00,0x00,
+00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,
+0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,
+0xff,0xff,0xff,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+0xff,0xff,0xff,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+0xff,0xff,0xff,0xff,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,
+0xff,0xff,0xff,0xff,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,
+00,0x03,0x00,0x07,0x00,0x0e,0x00,0x1c,0x00,0x38,0x00,0x70,0x00,0xe0,0x00,0xc0,
+00,0xc0,0x00,0xe0,0x00,0x70,0x00,0x38,0x00,0x1c,0x00,0x0e,0x00,0x07,0x00,0x03,
+00,0xc0,0x00,0xc0,0x00,0xc0,0x00,0x60,0x00,0x30,0x00,0x18,0x00,0x0f,0x00,0x07,
+00,0x03,0x00,0x03,0x00,0x03,0x00,0x06,0x00,0x0c,0x00,0x18,0x00,0xf0,0x00,0xe0,
+00,0x00,0x00,0x00,0x80,0x00,0xc0,0x00,0xe0,0x00,0xf0,0x00,0xf8,0x00,0xfc,0x00,
+00,0x00,0x00,0x00,0x01,0x00,0x03,0x00,0x07,0x00,0x0f,00,0x1f,00,0x3f,00, -1
+		};
+		for (int i = 0; vram_test[i] != -1; i++) {
+			this->vram->write_internal(i, vram_test[i]);
 		}
+	int vram_test_2[] = {8, 00, 02, 00, 0x0A, 00, 02, 00, 0x0A, 00, 00, 00, 00, 00, 00, -1};
+		for (int i = 0; vram_test[i] != -1; i++) {
+			this->vram->write_internal(i + 0x8000, vram_test_2[i]);
+		}
+		for (int i = 0; vram_test[i] != -1; i++) {
+			this->vram->write_internal(i, vram_test[i]);
+		}
+		int vram_test_3[] = {8, 00, 02, 00, 0x0A, 00, 02, 00, 0x0A, 00, 00, 00, 00, 00, 00, -1};
+		for (int i = 0; vram_test[i] != -1; i++) {
+			this->vram->write_internal(i + 0x8080, vram_test_3[i]);
+		}
+		for (int i = 0; vram_test[i] != -1; i++) {
+			this->vram->write_internal(i, vram_test[i]);
+		}
+		int vram_test_4[] = {8, 00, 02, 00, 0x0A, 00, 02, 00, 0x0A, 00, 00, 00, 00, 00, 00, -1};
+		for (int i = 0; vram_test[i] != -1; i++) {
+			this->vram->write_internal(i + 0x8100, vram_test_4[i]);
+		}
+		this->vram->write_internal(0x8040, 04);
+		this->vram->write_internal(0x8042, 06);
+		this->vram->write_internal(0x8044, 04);
+		this->vram->write_internal(0x8046, 06);
+		this->vram->write_internal(0x8048, 04);
+
+		this->vram->write_internal(0x80C0, 04);
+		this->vram->write_internal(0x80C2, 06);
+		this->vram->write_internal(0x80C4, 04);
+		this->vram->write_internal(0x80C6, 06);
+		this->vram->write_internal(0x80C8, 04);
+
+		//registers
+
+		this->_registers._bgmode.bgMode = 0;
+		this->_registers._bgmode.characterSizeBg1 = true;
+		this->_registers._bgmode.characterSizeBg2 = true;
+
+		this->_registers._bgsc[0].tilemapAddress = 0x4000U >> 10U;
+		this->_registers._bgsc[1].tilemapAddress = 0x6000U >> 10U;
+		this->_backgrounds[0].setTileMapStartAddress(this->getTileMapStartAddress(1));
+		this->_backgrounds[1].setTileMapStartAddress(this->getTileMapStartAddress(1));
+		this->_backgrounds[2].setTileMapStartAddress(this->getTileMapStartAddress(2));
+		this->_backgrounds[3].setTileMapStartAddress(this->getTileMapStartAddress(2));
+
+		this->_registers._t[0].enableWindowDisplayBg1 = true;
+		this->_registers._t[0].enableWindowDisplayBg2 = true;
 	}
 
 	uint8_t PPU::read(uint24_t addr)
 	{
+		return 0;
 		switch (addr) {
 		case ppuRegisters::mpyl:
 			return  this->_registers._mpy.mpyl;
@@ -66,6 +158,7 @@ namespace ComSquare::PPU
 
 	void PPU::write(uint24_t addr, uint8_t data)
 	{
+		return;
 		switch (addr) {
 		case ppuRegisters::inidisp:
 			this->_registers._inidisp.raw = data;
@@ -469,7 +562,7 @@ namespace ComSquare::PPU
 
 	uint16_t PPU::getTileMapStartAddress(int bgNumber)
 	{
-		return this->_registers._bgsc[bgNumber - 1].tilemapAddress << 1U;
+		return this->_registers._bgsc[bgNumber - 1].tilemapAddress << 11U;
 	}
 
 	uint16_t PPU::getTileSetAddress(int bgNumber)
@@ -498,9 +591,9 @@ namespace ComSquare::PPU
 
 		colorPalette = this->cgram->read_internal(0);
 		colorPalette += this->cgram->read_internal(1) << 8U;
-		for (unsigned long i = 0; i < this->_mainScreen.size(); i++)
-			for (unsigned long j = 0; j < this->_mainScreen[i].size(); j++)
-				this->_mainScreen[i][j] = getRealColor(colorPalette);
+		for (unsigned long i = 0; i < this->_subScreen.size(); i++)
+			for (unsigned long j = 0; j < this->_subScreen[i].size(); j++)
+				this->_subScreen[i][j] = getRealColor(colorPalette);
 		// the buffer is overwrite if necessary by a new bg so the background priority is from back to front
 		// the starting palette index isn't implemented
 		switch (this->_registers._bgmode.bgMode) {
@@ -603,8 +696,8 @@ namespace ComSquare::PPU
 		int i = bg.bgNumber + bg.priority;
 
 		if (this->_registers._t[0].raw & (1U << (bg.bgNumber - 1U)))
-			this->add_buffer(this->_mainScreen, this->_backgrounds[i].buffer);
+			this->add_buffer(this->_mainScreen, bg.buffer);
 		if (this->_registers._t[1].raw & (1U << (bg.bgNumber - 1U)))
-			this->add_buffer(this->_subScreen, this->_backgrounds[i].buffer);
+			this->add_buffer(this->_subScreen, bg.buffer);
 	}
 }
\ No newline at end of file
diff --git a/sources/PPU/PPU.hpp b/sources/PPU/PPU.hpp
index d2c1401..31454fa 100644
--- a/sources/PPU/PPU.hpp
+++ b/sources/PPU/PPU.hpp
@@ -18,6 +18,10 @@
 //#define max4BitTiles		2048
 //#define max8BitTiles		1024
 
+#define VRAMSIZE 65536
+#define CGRAMSIZE 512
+#define OAMRAMSIZE 544
+
 namespace ComSquare::PPU
 {
 	class Background;
diff --git a/sources/PPU/PPUUtils.hpp b/sources/PPU/PPUUtils.hpp
index 11f963e..16d90e3 100644
--- a/sources/PPU/PPUUtils.hpp
+++ b/sources/PPU/PPUUtils.hpp
@@ -21,4 +21,4 @@ namespace ComSquare::PPU
 		uint16_t raw;
 	};
 }
-#endif //COMSQUARE_PPU_UTILS_HPP
+#endif //COMSQUARE_PPU_UTILS_HPP
\ No newline at end of file