diff --git a/font.png b/font.png
new file mode 100644
index 0000000..fa3849a
Binary files /dev/null and b/font.png differ
diff --git a/source/main.cpp b/source/main.cpp
index c30276c..56379ec 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -17,6 +17,7 @@ int main(int argc, char *argv[]) {
     m6502dis::symbols::load();
     atari2600::init();
     atari2600::pause();
+    m6502debugger::init();
     m6502debugger::show();
 
     int wait = 16;
diff --git a/source/ui.cpp b/source/ui.cpp
index 4e3abae..e4a56f7 100644
--- a/source/ui.cpp
+++ b/source/ui.cpp
@@ -33,7 +33,7 @@ namespace ui
 
     SDL_Texture * createtexture(SDL_Renderer *renderer)
     {
-        SDL_Surface *bmp_surface = SDL_LoadBMP("font.bmp");
+        SDL_Surface *bmp_surface = SDL_LoadPNG("font.png");
         SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, bmp_surface);
         SDL_DestroySurface(bmp_surface);
         SDL_SetTextureScaleMode(texture, SDL_SCALEMODE_NEAREST);
diff --git a/source/ui/context.cpp b/source/ui/context.cpp
new file mode 100644
index 0000000..9a3346b
--- /dev/null
+++ b/source/ui/context.cpp
@@ -0,0 +1,126 @@
+#include "context.h"
+
+#define CHR_W 6
+#define CHR_H 13
+
+namespace ui
+{
+    Context::Context(SDL_Window *window)
+    {
+        this->win = window;
+        this->ren = SDL_CreateRenderer(this->win, NULL);
+        this->fontTex = LoadTexture("font.png");
+
+        this->offsetX = this->offsetY = 0;
+    }
+
+    Context::~Context()
+    {
+        SDL_DestroyRenderer(this->ren);
+        SDL_DestroyTexture(this->fontTex);
+    }
+
+    SDL_Texture *Context::CreateTexture(int width, int height)
+    {
+        SDL_Texture *texture = SDL_CreateTexture(this->ren, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, width, height);
+        SDL_SetTextureScaleMode(texture, SDL_SCALEMODE_NEAREST);
+        SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
+        return texture;
+    }
+
+    SDL_Texture *Context::LoadTexture(const char* filename)
+    {
+        SDL_Surface *bmp_surface = SDL_LoadPNG(filename);
+        SDL_Texture *texture = SDL_CreateTextureFromSurface(this->ren, bmp_surface);
+        SDL_DestroySurface(bmp_surface);
+        SDL_SetTextureScaleMode(texture, SDL_SCALEMODE_NEAREST);
+        SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
+        return texture;
+    }
+
+    void Context::SetOffset(int x, int y)
+    {
+        this->offsetX = x;
+        this->offsetY = y;
+    }
+
+    void Context::IncOffset(int x, int y)
+    {
+        this->offsetX += x;
+        this->offsetY += y;
+    }
+
+    int Context::GetOffsetX()
+    {
+        return this->offsetX;
+    }
+
+    int Context::GetOffsetY()
+    {
+        return this->offsetY;
+    }
+
+    void Context::PushOffset()
+    {
+        this->offsetStack.push({this->offsetX, this->offsetY});
+    }
+
+    void Context::PopOffset()
+    {
+        this->offsetX = this->offsetStack.top().first;
+        this->offsetY = this->offsetStack.top().second;
+        this->offsetStack.pop();
+    }
+
+    void Context::ClearOffsetStack()
+    {
+        this->offsetStack = std::stack<std::pair<int, int>>();
+    }
+
+    bool Context::IsMouseInside(int x, int y, int w, int h)
+    {
+        float tmpf_x, tmpf_y;
+        SDL_GetMouseState(&tmpf_x, &tmpf_y);
+
+        const int tmp_x = int(tmpf_x) + this->offsetX;
+        const int tmp_y = int(tmpf_y) + this->offsetY;
+
+        return ( (tmp_x >= x) && (tmp_x < x+w) && (tmp_y >= y) && (tmp_y < y+h) );
+    }
+
+    void Context::DrawRect(int x, int y, int w, int h, uint32_t color)
+    {
+        SDL_FRect rect {float(this->offsetX+x), float(this->offsetY+y), float(w), float(h)};
+        SDL_SetRenderDrawColor(this->ren, (color>>16)&0xff, (color>>8)&0xff, color&0xff, (color>>24)&0xff);
+        SDL_RenderRect(this->ren, &rect);
+    }
+
+    void Context::FillRect(int x, int y, int w, int h, uint32_t color)
+    {
+        SDL_FRect rect {float(this->offsetX+x), float(this->offsetY+y), float(w), float(h)};
+        SDL_SetRenderDrawColor(this->ren, (color>>16)&0xff, (color>>8)&0xff, color&0xff, (color>>24)&0xff);
+        SDL_RenderFillRect(this->ren, &rect);
+    }
+
+    void Context::DrawLine(int x1, int y1, int x2, int y2, uint32_t color)
+    {
+        SDL_SetRenderDrawColor(this->ren, (color>>16)&0xff, (color>>8)&0xff, color&0xff, (color>>24)&0xff);
+        SDL_RenderLine(this->ren, float(this->offsetX+x1), float(this->offsetY+y1), float(this->offsetX+x2), float(this->offsetY+y2));
+    }
+
+    void Context::DrawChar(int x, int y, char chr, uint32_t color=0xffffffff)
+    {
+        if (color != 255) SDL_SetRenderDrawColor(this->ren, (color>>16)&0xff, (color>>8)&0xff, color&0xff, (color>>24)&0xff);
+        if (chr==32) return;
+        if (chr<32 || chr>127) chr = '.';
+        SDL_FRect src {float((chr-32)&0xf)*CHR_W, float((chr-32)>>4)*CHR_H, float(CHR_W), float(CHR_H)};
+        SDL_FRect dst {float(this->offsetX+x), float(this->offsetY+y), float(CHR_W), float(CHR_H)};
+        SDL_RenderTexture(ren, this->fontTex, &src, &dst);
+    }
+
+    void Context::DrawText(int x, int y, const char *text, uint32_t color)
+    {
+        SDL_SetTextureColorMod(this->fontTex, (color>>16)&0xff, (color>>8)&0xff, color&0xff);
+        for (int i=0; i<(int)strlen(text);++i) if (text[i]!=32) DrawChar(x+i*CHR_W, y, text[i]);
+    }
+}
\ No newline at end of file
diff --git a/source/ui/context.h b/source/ui/context.h
new file mode 100644
index 0000000..af29ff1
--- /dev/null
+++ b/source/ui/context.h
@@ -0,0 +1,39 @@
+#pragma once
+#include <SDL3/SDL.h>
+#include <stack>
+
+namespace ui
+{
+    class Context {
+        public:
+            Context(SDL_Window *window);
+            ~Context();
+
+            SDL_Texture * CreateTexture(int width, int height);
+            SDL_Texture * LoadTexture(const char* filename);
+
+            void SetOffset(int x, int y);
+            void IncOffset(int x, int y);
+            int GetOffsetX();
+            int GetOffsetY();
+            void PushOffset();
+            void PopOffset();
+            void ClearOffsetStack();
+
+            bool IsMouseInside(int x, int y, int w, int h);
+
+            void DrawRect(int x, int y, int w, int h, uint32_t color);
+            void FillRect(int x, int y, int w, int h, uint32_t color);
+            void DrawLine(int x1, int y1, int x2, int y2, uint32_t color);
+            void DrawChar(int x, int y, char chr, uint32_t color=0xffffffff);
+            void DrawText(int x, int y, const char *text, uint32_t color);
+
+        protected:
+            SDL_Window *win;
+            SDL_Renderer *ren;
+            SDL_Texture *fontTex;
+
+            int offsetX, offsetY;
+            std::stack<std::pair<int, int>> offsetStack;
+    };
+}
diff --git a/source/ui/window.cpp b/source/ui/window.cpp
new file mode 100644
index 0000000..f0d7c1e
--- /dev/null
+++ b/source/ui/window.cpp
@@ -0,0 +1,50 @@
+#include "window.h"
+
+namespace ui
+{
+    Window::Window(const char *title, int width, int height)
+    {
+        this->win = SDL_CreateWindow(title, width, height, 0);
+        this->context = new Context(this->win);
+
+        windows.push_back({SDL_GetWindowID(this->win), this});
+
+        float x, y;
+        SDL_GetMouseState(&x, &y);
+        input.mouse.x = int(x);
+        input.mouse.y = int(y);
+    }
+
+    Window::~Window()
+    {
+        for (size_t i=0; i<windows.size(); ++i) { if (windows[i].second==this) std::swap(windows[i], windows.back()); windows.pop_back(); break; }
+
+        delete this->context;
+        SDL_DestroyWindow(this->win);
+    }
+    
+    bool Window::HandleEvents(SDL_Event *e)
+    {
+        switch (e->type) {
+            case SDL_EVENT_MOUSE_MOTION:
+                input.mouse.x = e->motion.x;
+                input.mouse.y = e->motion.y;
+            
+            // ...
+            
+            default: break;
+        }
+    }
+
+
+    /* MÈTODES ESTATICS */
+    /* ================ */
+
+    std::vector<std::pair<uint32_t, Window*>> Window::windows;
+
+    void Window::DistributeEvent(SDL_Event *e)
+    {
+        uint32_t id = SDL_GetWindowID(SDL_GetWindowFromEvent(e));
+        for (auto window : Window::windows) if (window.first == id) window.second->HandleEvents(e);
+    }
+}
\ No newline at end of file
diff --git a/source/ui/window.h b/source/ui/window.h
new file mode 100644
index 0000000..bc8c876
--- /dev/null
+++ b/source/ui/window.h
@@ -0,0 +1,38 @@
+#pragma once
+#include "context.h"
+#include <vector>
+
+namespace ui
+{
+    enum MouseButton { mbLeft = 0, mbMiddle = 1, mbRight = 2 };
+    enum MouseButtonState { mbsReleased, mbsDown, mbsPressed, mbsUp };
+    struct Input {
+        struct {
+            int x, y;
+            MouseButtonState buttons[3] = {mbsReleased, mbsReleased, mbsReleased};
+        } mouse;
+        struct {
+            uint8_t keyDown = 0;
+            uint8_t keyUp = 0;
+            const bool *keys;
+        } keyboard;
+    };
+
+    class Window {
+        public:
+
+            Window(const char *title, int width, int height);
+            ~Window();
+
+            bool HandleEvents(SDL_Event *e);
+
+            static void DistributeEvent(SDL_Event *e);
+
+        protected:
+            SDL_Window *win;
+            Context *context;
+            Input input;
+
+            static std::vector<std::pair<uint32_t, Window*>> windows;
+    };
+}
\ No newline at end of file