diff --git a/sources/PPU/Background.cpp b/sources/PPU/Background.cpp
index 52658c0..fb985f2 100644
--- a/sources/PPU/Background.cpp
+++ b/sources/PPU/Background.cpp
@@ -100,7 +100,7 @@ namespace ComSquare::PPU
 			column -= TILE_PIXEL_WIDTH;
 		}
 		// might not work with 8 bpp must check
-		tileAddress += this->_bpp * row;
+		tileAddress += this->_bpp * row / 2;
 
 		return this->getPixelReferenceFromTileRow(tileAddress, column);
 	}
@@ -111,8 +111,9 @@ namespace ComSquare::PPU
 		uint8_t lowByte = this->_vram->read_internal((tileAddress + 1) % VRAMSIZE);
 		uint8_t secondHighByte;
 		uint8_t secondLowByte;
-		uint8_t result = 0;
+		uint16_t result = 0;
 		uint8_t shift = (TILE_PIXEL_WIDTH - 1U - pixelIndex);
+		uint16_t tmp;
 
 		switch (this->_bpp) {
 		case 8:
@@ -120,9 +121,11 @@ namespace ComSquare::PPU
 		case 4:
 			secondHighByte =  this->_vram->read_internal((tileAddress + 16) % VRAMSIZE);
 			secondLowByte = this->_vram->read_internal((tileAddress + 17) % VRAMSIZE);
-			result = ((secondHighByte & (1U << shift)) | ((secondLowByte & (1U << shift)) << 1U)) >> (shift - 2U);
+			result = ((secondHighByte & (1U << shift)) | ((secondLowByte & (1U << shift)) << 1U));
+			result = (shift - 2 >= 0) ? result >> (shift - 2) : result << ((shift - 2) * -1);
 		case 2:
-			result += ((highByte & (1U << shift)) | ((lowByte & (1U << shift)) << 1U)) >> shift;
+			tmp = ((highByte & (1U << shift)) | ((lowByte & (1U << shift)) << 1U));
+			result += (shift >= 0) ? tmp >> shift : tmp << shift;
 		default:
 			break;
 		}
diff --git a/sources/PPU/PPU.cpp b/sources/PPU/PPU.cpp
index e84c468..388e622 100644
--- a/sources/PPU/PPU.cpp
+++ b/sources/PPU/PPU.cpp
@@ -644,9 +644,6 @@ namespace ComSquare::PPU
 				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
-		this->addToMainSubScreen(this->_backgrounds[bgName::bg1NoPriority]);
-		this->addToMainSubScreen(this->_backgrounds[bgName::bg1Priority]);
-		return;
 		switch (this->_registers._bgmode.bgMode) {
 		case 0:
 			this->addToMainSubScreen(this->_backgrounds[bgName::bg4NoPriority]);