diff --git a/gui/CMakeLists.txt b/gui/CMakeLists.txt
index b81bf5f..4b1be7a 100644
--- a/gui/CMakeLists.txt
+++ b/gui/CMakeLists.txt
@@ -1,5 +1,5 @@
-set(HEADERS canvas.h gui.h window.h main_window.h char_map.h pattern_display.h pattern_window.h nametable_window.h)
-set(SOURCE canvas.c gui.c window.c main_window.c char_map.c pattern_display.c pattern_window.c nametable_window.c)
+set(HEADERS canvas.h gui.h window.h main_window.h char_map.h pattern_display.h pattern_window.h nametable_window.h dbg_pattern_table.h)
+set(SOURCE canvas.c gui.c window.c main_window.c char_map.c pattern_display.c pattern_window.c nametable_window.c dbg_pattern_table.c)
 
 add_library(nes_gui ${SOURCE} ${HEADERS})
 
diff --git a/gui/dbg_pattern_table.c b/gui/dbg_pattern_table.c
new file mode 100644
index 0000000..217a83a
--- /dev/null
+++ b/gui/dbg_pattern_table.c
@@ -0,0 +1,96 @@
+//
+// Created by william on 7/12/24.
+//
+
+#include <assert.h>
+#include <stdbool.h>
+#include "dbg_pattern_table.h"
+#include "../include/ppu.h"
+#include "../include/system.h"
+
+DebugPatternTable pattern_table;
+
+void dbg_pattern_table_build_bank(DebugPattern *bank, byte *pattern_memory) {
+    for (int tile_index = 0; tile_index < PATTERN_TABLE_SIZE; tile_index++) {
+        DebugPattern *pattern = &bank[tile_index];
+
+        address tile_addr = tile_index * PATTERN_BYTES;
+        memcpy(pattern->data_low, &pattern_memory[tile_addr], PATTERN_SIZE);
+        memcpy(pattern->data_high, &pattern_memory[tile_addr + PATTERN_SIZE], PATTERN_SIZE);
+    }
+}
+
+void dbg_pattern_table_init() {
+    byte *pattern_memory = system_get_mapper()->ppu_read(0);
+
+    dbg_pattern_table_build_bank(pattern_table.bank_0, pattern_memory);
+    dbg_pattern_table_build_bank(pattern_table.bank_1, &pattern_memory[PATTERN_BANK_SIZE]);
+}
+
+DebugPattern dbg_pattern_get(int x, int y, int bank) {
+    address pattern_addr = x + y * PATTERN_TABLE_WIDTH;
+
+    switch (bank) {
+        case PATTERN_BANK_0:
+            return pattern_table.bank_0[pattern_addr];
+        case PATTERN_BANK_1:
+            return pattern_table.bank_1[pattern_addr];
+        default:
+            assert(false);
+    }
+}
+
+void dbg_pattern_draw_borders(pixel *buffer, int buffer_width) {
+    for (int by = 0; by < PATTERN_DRAW_SIZE; by++) {
+        address pixel_addr = (by * buffer_width) + PATTERN_DRAW_SIZE - 1;
+        buffer[pixel_addr] = PATTERN_BORDER_COLOR;
+    }
+
+    for (int bx = 0; bx < PATTERN_DRAW_SIZE; bx++) {
+        address pixel_addr = ((PATTERN_DRAW_SIZE - 1) * buffer_width) + bx;
+        buffer[pixel_addr] = PATTERN_BORDER_COLOR;
+    }
+}
+
+void dbg_pattern_draw(int x, int y, int bank, pixel *buffer, int buffer_width) {
+    DebugPattern pattern = dbg_pattern_get(x, y, bank);
+    for (int fine_y = 0; fine_y < PATTERN_SIZE; fine_y++) {
+        byte data_high = pattern.data_high[fine_y];
+        byte data_low = pattern.data_low[fine_y];
+
+        for (int fine_x = 0; fine_x < PATTERN_SIZE; fine_x++) {
+            byte bitmask = 1 << (PATTERN_SIZE - fine_x - 1);
+            byte bit_high = data_high & bitmask;
+            byte bit_low = data_low & bitmask;
+
+            address pixel_addr = fine_x + fine_y * buffer_width;
+            pixel *pixel = &buffer[pixel_addr];
+
+            // TODO: Use palette colors
+            if (bit_high && bit_low) {
+                *pixel = 0xffffffff;
+            } else if (bit_low) {
+                *pixel = 0xffff0000;
+            } else if (bit_high) {
+                *pixel = 0xff00ffff;
+            } else {
+                *pixel = 0xff000000;
+            }
+        }
+    }
+
+    dbg_pattern_draw_borders(buffer, buffer_width);
+}
+
+void dbg_pattern_draw_bank(int bank, pixel *buffer) {
+    int buffer_width = PATTERN_TABLE_WIDTH * PATTERN_DRAW_SIZE;
+
+    for (int x = 0; x < PATTERN_TABLE_WIDTH; x++) {
+        for (int y = 0; y < PATTERN_TABLE_WIDTH; y++) {
+            address row_addr = (y * PATTERN_DRAW_SIZE) * buffer_width;
+            address tile_addr = row_addr + (x * PATTERN_DRAW_SIZE);
+
+            dbg_pattern_draw(x, y, bank, &buffer[tile_addr], buffer_width);
+        }
+    }
+}
\ No newline at end of file
diff --git a/gui/dbg_pattern_table.h b/gui/dbg_pattern_table.h
new file mode 100644
index 0000000..cfe60d2
--- /dev/null
+++ b/gui/dbg_pattern_table.h
@@ -0,0 +1,43 @@
+//
+// Created by william on 7/12/24.
+//
+
+#ifndef NES_EMULATOR_DBG_PATTERN_TABLE_H
+#define NES_EMULATOR_DBG_PATTERN_TABLE_H
+
+#include <string.h>
+#include "../include/types.h"
+
+#define PATTERN_BANK_SIZE 0x1000
+#define PATTERN_TABLE_WIDTH 0x10
+#define PATTERN_TABLE_SIZE (PATTERN_TABLE_WIDTH * PATTERN_TABLE_WIDTH)
+#define PATTERN_SIZE 8
+#define PATTERN_BYTES (PATTERN_SIZE * 2)
+#define PATTERN_BORDER_WIDTH 1
+#define PATTERN_BORDER_COLOR 0xff2223b2
+#define PATTERN_DRAW_SIZE (PATTERN_SIZE + PATTERN_BORDER_WIDTH)
+
+#define PATTERN_BANK_0 0
+#define PATTERN_BANK_1 1
+
+typedef unsigned int pixel;
+
+typedef struct dbg_pattern {
+    byte data_low[PATTERN_SIZE];
+    byte data_high[PATTERN_SIZE];
+} DebugPattern;
+
+typedef struct dbg_pattern_table {
+    DebugPattern bank_0[PATTERN_TABLE_SIZE];
+    DebugPattern bank_1[PATTERN_TABLE_SIZE];
+} DebugPatternTable;
+
+void dbg_pattern_table_init();
+
+DebugPattern dbg_pattern_get(int x, int y, int bank);
+
+void dbg_pattern_draw(int x, int y, int bank, pixel *buffer, int buffer_width);
+
+void dbg_pattern_draw_bank(int bank, pixel *buffer);
+
+#endif //NES_EMULATOR_DBG_PATTERN_TABLE_H
diff --git a/gui/gui.c b/gui/gui.c
index daba98b..d3936e1 100644
--- a/gui/gui.c
+++ b/gui/gui.c
@@ -9,6 +9,7 @@
 #include "pattern_window.h"
 #include "../include/system.h"
 #include "nametable_window.h"
+#include "dbg_pattern_table.h"
 
 typedef struct nes_gui {
     NesMainWindow main_window;
@@ -21,6 +22,7 @@ typedef struct nes_gui {
     bool debug_enabled;
     Uint32 last_frame_tick;
     Uint32 frame_delay;
+    unsigned long tick;
 } NesGui;
 NesGui gui;
 
@@ -32,16 +34,14 @@ bool gui_init() {
         return false;
     }
 
-    gui.debug_enabled = false;
+    gui.debug_enabled = true;
+    gui.tick = 0;
 
     main_window_init(&gui.main_window, gui.font);
 
     if (gui.debug_enabled) {
-        byte *pattern_memory = system_get_mapper()->ppu_read(0);
-        pattern_window_init(&gui.pattern_window, pattern_memory);
-
-        PPUMemory *ppu_memory = &ppu_get_state()->memory;
-        nametable_window_init(&gui.nametable_window, ppu_memory->nametable_0, ppu_memory->nametable_1);
+        pattern_window_init(&gui.pattern_window);
+//        nametable_window_init(&gui.nametable_window);
     }
 
     return true;
@@ -52,7 +52,7 @@ void gui_uninit() {
 
     if (gui.debug_enabled) {
         pattern_window_uninit(&gui.pattern_window);
-        nametable_window_uninit(&gui.nametable_window);
+//        nametable_window_uninit(&gui.nametable_window);
     }
 
     TTF_CloseFont(gui.font);
@@ -60,8 +60,9 @@ void gui_uninit() {
 
 void gui_post_sysinit() {
     if (gui.debug_enabled) {
+        dbg_pattern_table_init();
+
         pattern_window_build_table(&gui.pattern_window);
-        nametable_window_update(&gui.nametable_window);
     }
 }
 
@@ -82,8 +83,15 @@ void gui_render() {
 
     if (gui.debug_enabled) {
         pattern_window_render(&gui.pattern_window);
-        nametable_window_render(&gui.nametable_window);
+
+//        if (gui.tick % 60 == 0) {
+//            PPUMemory *ppu_memory = &ppu_get_state()->memory;
+//            nametable_window_update(&gui.nametable_window, ppu_memory->nametable_0, ppu_memory->nametable_1);
+//        }
+//        nametable_window_render(&gui.nametable_window);
     }
+
+    gui.tick++;
 }
 
 void gui_present() {
@@ -91,7 +99,7 @@ void gui_present() {
 
     if (gui.debug_enabled) {
         pattern_window_present(&gui.pattern_window);
-        nametable_window_present(&gui.nametable_window);
+//        nametable_window_present(&gui.nametable_window);
     }
 }
 
diff --git a/gui/nametable_window.c b/gui/nametable_window.c
index 1453c1d..906f473 100644
--- a/gui/nametable_window.c
+++ b/gui/nametable_window.c
@@ -7,14 +7,11 @@
 
 #define NAMETABLE_BANK_SIZE 0x0400
 
-void nametable_window_init(NesNametableWindow *window, byte *nametable_0, byte *nametable_1) {
+void nametable_window_init(NesNametableWindow *window) {
     int win_size = pattern_display_get_size(NW_ROW_TILE_COUNT);
     window->sdl_context = window_init("Nametable", win_size, win_size, NW_SCALE);
 
-    window->nametable_0 = nametable_0;
-    window->nametable_1 = nametable_1;
-
-    pattern_display_init(&window->pattern_display, window->sdl_context.renderer, NW_ROW_TILE_COUNT, NW_ROW_TILE_COUNT,
+    pattern_display_init(&window->pattern_display, window->sdl_context.renderer, NW_ROW_TILE_COUNT, NW_ROW_TILE_COUNT - 2,
                          PATTERN_DISPLAY_DYNAMIC);
 }
 
@@ -27,7 +24,7 @@ static byte *nametable_window_read_byte(address addr, void *data) {
     assert(addr < NAMETABLE_BANK_SIZE * 4);
     assert(data != NULL);
 
-    NesNametableWindow *window = (NesNametableWindow *) data;
+    byte **nametables = (byte **) data;
 
     int bank = addr / NAMETABLE_BANK_SIZE;
     int bank_addr = addr % NAMETABLE_BANK_SIZE;
@@ -35,14 +32,18 @@ static byte *nametable_window_read_byte(address addr, void *data) {
     switch (bank) {
         case 0:
         case 1:
-            return &window->nametable_0[bank_addr];
+            return &nametables[0][bank_addr];
         default:
-            return &window->nametable_1[bank_addr];
+            return &nametables[1][bank_addr];
     }
 }
 
-void nametable_window_update(NesNametableWindow *window) {
-    pattern_display_build(&window->pattern_display, &nametable_window_read_byte, window);
+void nametable_window_update(NesNametableWindow *window, byte *nametable_0, byte *nametable_1) {
+    byte **nametables[2];
+    nametables[0] = &nametable_0;
+    nametables[1] = &nametable_1;
+
+    pattern_display_build(&window->pattern_display, &nametable_window_read_byte, nametables);
 }
 
 void nametable_window_render(NesNametableWindow *window) {
diff --git a/gui/nametable_window.h b/gui/nametable_window.h
index edb8fa5..1383046 100644
--- a/gui/nametable_window.h
+++ b/gui/nametable_window.h
@@ -15,15 +15,12 @@
 typedef struct nes_nametable_window {
     NesSdlContext sdl_context;
     PatternDisplay pattern_display;
-
-    byte *nametable_0;
-    byte *nametable_1;
 } NesNametableWindow;
 
-void nametable_window_init(NesNametableWindow *window, byte* nametable_0, byte* nametable_1);
+void nametable_window_init(NesNametableWindow *window);
 void nametable_window_uninit(NesNametableWindow *window);
 
-void nametable_window_update(NesNametableWindow *window);
+void nametable_window_update(NesNametableWindow *window, byte* nametable_0, byte* nametable_1);
 
 void nametable_window_render(NesNametableWindow *window);
 void nametable_window_present(NesNametableWindow *window);
diff --git a/gui/pattern_window.c b/gui/pattern_window.c
index ebd6b3f..bd47da1 100644
--- a/gui/pattern_window.c
+++ b/gui/pattern_window.c
@@ -2,41 +2,43 @@
 // Created by william on 6/14/24.
 //
 
-#include <assert.h>
 #include "pattern_window.h"
+#include "dbg_pattern_table.h"
 
 #define PW_SCALE 2
+#define PW_WIDTH (PW_ROW_TILE_COUNT * PATTERN_DRAW_SIZE)
+#define PW_HEIGHT (PW_WIDTH * 2)
+#define PW_BUFFER_SIZE (PW_WIDTH * PW_HEIGHT)
 
-void pattern_window_init(NesPatternWindow *window, byte *pattern_memory) {
+void pattern_window_init(NesPatternWindow *window) {
     int win_width = pattern_display_get_size(PW_ROW_TILE_COUNT);
     window->sdl_context = window_init("Pattern Table", win_width, win_width * 2, PW_SCALE);
-    window->pattern_memory = pattern_memory;
 
-    pattern_display_init(&window->pattern_display, window->sdl_context.renderer, PW_ROW_TILE_COUNT,
-                         PW_ROW_TILE_COUNT * 2, PATTERN_DISPLAY_STATIC);
+    window->texture = SDL_CreateTexture(window->sdl_context.renderer, SDL_PIXELFORMAT_ARGB8888,
+                                        SDL_TEXTUREACCESS_STATIC, PW_WIDTH, PW_HEIGHT);
+
+//    pattern_display_init(&window->pattern_display, window->sdl_context.renderer, PW_ROW_TILE_COUNT,
+//                         PW_ROW_TILE_COUNT * 2, PATTERN_DISPLAY_STATIC);
 }
 
 void pattern_window_uninit(NesPatternWindow *window) {
-    pattern_display_uninit(&window->pattern_display);
+    SDL_DestroyTexture(window->texture);
+//    pattern_display_uninit(&window->pattern_display);
     window_uninit(window->sdl_context);
 }
 
-static byte *pattern_window_read_byte(address addr, void *data) {
-    assert(data != NULL);
-    assert(addr < 0x2000);
-
-    NesPatternWindow *window = (NesPatternWindow *) data;
-
-    return &window->pattern_memory[addr];
-}
-
 void pattern_window_build_table(NesPatternWindow *window) {
-    pattern_display_build(&window->pattern_display, &pattern_window_read_byte, window);
+    pixel buffer[PW_BUFFER_SIZE] = {0};
+    dbg_pattern_draw_bank(PATTERN_BANK_0, buffer);
+    dbg_pattern_draw_bank(PATTERN_BANK_1, &buffer[PW_WIDTH * (PW_HEIGHT / 2)]);
+
+    SDL_UpdateTexture(window->texture, NULL, buffer, PW_WIDTH * sizeof(pixel));
 }
 
 void pattern_window_render(NesPatternWindow *window) {
     SDL_RenderClear(window->sdl_context.renderer);
-    pattern_display_render(&window->pattern_display, window->sdl_context.renderer);
+    SDL_RenderCopy(window->sdl_context.renderer, window->texture, NULL, NULL);
+//    pattern_display_render(&window->pattern_display, window->sdl_context.renderer);
 }
 
 void pattern_window_present(NesPatternWindow *window) {
diff --git a/gui/pattern_window.h b/gui/pattern_window.h
index 9d004ca..c78386f 100644
--- a/gui/pattern_window.h
+++ b/gui/pattern_window.h
@@ -14,10 +14,10 @@
 typedef struct nes_pattern_window {
     NesSdlContext sdl_context;
     PatternDisplay pattern_display;
-    byte* pattern_memory;
+    SDL_Texture *texture;
 } NesPatternWindow;
 
-void pattern_window_init(NesPatternWindow *window, byte *pattern_memory);
+void pattern_window_init(NesPatternWindow *window);
 void pattern_window_uninit(NesPatternWindow *window);
 
 void pattern_window_build_table(NesPatternWindow *window);
diff --git a/include/ppu.h b/include/ppu.h
index 3592ebf..eba088f 100644
--- a/include/ppu.h
+++ b/include/ppu.h
@@ -52,14 +52,14 @@
 
 #define PPU_MASK_NONE 0xff
 
-#define PATTERN_TABLE_SIZE 0x1000
-#define NAMETABLE_SIZE 0x0400
-#define PALETTE_TABLE_SIZE 0x0020
+#define PATTERN_TABLE_BYTES_SIZE 0x1000
+#define NAMETABLE_BYTES_SIZE 0x0400
+#define PALETTE_TABLE_BYTES_SIZE 0x0020
 
 typedef struct ppu_memory {
-    byte nametable_0[NAMETABLE_SIZE];
-    byte nametable_1[NAMETABLE_SIZE];
-    byte palette[PALETTE_TABLE_SIZE];
+    byte nametable_0[NAMETABLE_BYTES_SIZE];
+    byte nametable_1[NAMETABLE_BYTES_SIZE];
+    byte palette[PALETTE_TABLE_BYTES_SIZE];
 } PPUMemory;
 
 typedef struct ppu_tile_fetch {
diff --git a/ppu/ppu.c b/ppu/ppu.c
index 66fd4ec..cd2b6e3 100644
--- a/ppu/ppu.c
+++ b/ppu/ppu.c
@@ -252,7 +252,7 @@ void ppu_cycle() {
         ppu_post_render(ppu_state.cycle, ppu_state.scanline);
     } else if (ppu_state.scanline == PPU_PRE_RENDER_LINE) {
         ppu_pre_render(ppu_state.cycle);
-        ppu_visible_frame(ppu_state.cycle);
+//        ppu_visible_frame(ppu_state.cycle);
         ppu_state.ppu_address = ppu_state.temp_ppu_addr;
     }
 
@@ -315,7 +315,7 @@ void ppu_write(address addr, byte data) {
         relative_addr = addr - 0x2c00;
         ppu_state.memory.nametable_1[relative_addr] = data;
     } else if (addr >= 0x3f00) {
-        relative_addr = (addr - 0x3f00) % PALETTE_TABLE_SIZE;
+        relative_addr = (addr - 0x3f00) % PALETTE_TABLE_BYTES_SIZE;
         ppu_state.memory.palette[relative_addr] = data;
     }
 }
@@ -356,7 +356,7 @@ byte ppu_read(address addr) {
         relative_addr = addr - 0x2c00;
         return ppu_state.memory.nametable_1[relative_addr];
     } else if (addr >= 0x3f00) {
-        relative_addr = (addr - 0x3f00) % PALETTE_TABLE_SIZE;
+        relative_addr = (addr - 0x3f00) % PALETTE_TABLE_BYTES_SIZE;
         return ppu_state.memory.palette[relative_addr];
     }