diff --git a/include/chip8.h b/include/chip8.h
index 4d7a3fa..a652459 100644
--- a/include/chip8.h
+++ b/include/chip8.h
@@ -2,22 +2,26 @@
 #define CHIP8_CHIP8_H
 
 #include <string>
+#include <stack>
+#include "display.h"
 
 class InstructionHandler;
-class Display;
 
 class Chip8 {
 private:
     unsigned char memory[0xFFF] = {};
     unsigned char v[0x10] = {};
+    std::stack<unsigned short> stack{};
     unsigned short pc;
-    Display* display;
+    Display display;
     InstructionHandler* instructionHandler;
 public:
     Chip8();
     ~Chip8();
-    void loadRom(const std::string& file);
-    [[nodiscard]] Display* getDisplay() const;
+    void loadRom(const std::string&);
+    [[nodiscard]] Display getDisplay() const;
     void emulateCycle();
+    [[nodiscard]] unsigned short popFromStack();
+    void setProgramCounter(unsigned short);
 };
 #endif //CHIP8_CHIP8_H
diff --git a/include/display.h b/include/display.h
index 50213d2..6d58105 100644
--- a/include/display.h
+++ b/include/display.h
@@ -5,14 +5,13 @@
 #define STATE_OFF 0
 
 #include <SDL2/SDL.h>
-#include "chip8.h"
 
 class Display {
 private:
     bool flagRedraw = false;
     bool display[64 * 32] = {};
 public:
-    void draw(SDL_Renderer*, const Chip8&);
+    void draw(SDL_Renderer*);
     [[nodiscard]] bool needsRedraw() const;
     void clear();
 };
diff --git a/include/instruction_handler.h b/include/instruction_handler.h
index 3956f8a..2f36423 100644
--- a/include/instruction_handler.h
+++ b/include/instruction_handler.h
@@ -7,11 +7,11 @@
 
 class InstructionHandler {
 private:
-    typedef void (*Handler)(const Chip8&, Instruction);
+    typedef void (*Handler)(Chip8&, Instruction);
     std::map<unsigned short, Handler> handlers = {};
-    static void handle0000(const Chip8&, Instruction);
+    static void handle0000(Chip8&, Instruction);
 public:
     InstructionHandler();
-    void handleInstruction(unsigned short, const Chip8&, Instruction);
+    void handleInstruction(unsigned short, Chip8&, Instruction);
 };
 #endif //CHIP8_INSTRUCTION_HANDLER_H
diff --git a/src/chip8.cpp b/src/chip8.cpp
index 7b3123d..96fc306 100644
--- a/src/chip8.cpp
+++ b/src/chip8.cpp
@@ -4,14 +4,12 @@
 #include "../include/chip8.h"
 #include "../include/instruction.h"
 #include "../include/instruction_handler.h"
-#include "../include/display.h"
 
 Chip8::Chip8() : instructionHandler(), display() {
     this->pc = 0x200;
 }
 
 Chip8::~Chip8() {
-    delete display;
     delete instructionHandler;
 }
 
@@ -26,11 +24,22 @@ void Chip8::loadRom(const std::string& file) {
     fclose(game);
 }
 
-Display* Chip8::getDisplay() const {
+Display Chip8::getDisplay() const {
     return this->display;
 }
 
 void Chip8::emulateCycle() {
     unsigned short opcode = (this->memory[this->pc] << 8 | this->memory[this->pc + 1]);
+    this->pc += 2;
     this->instructionHandler->handleInstruction(opcode & 0xF000, *this, Instruction(opcode));
 }
+
+unsigned short Chip8::popFromStack() {
+    unsigned short value = this->stack.top();
+    this->stack.pop();
+    return value;
+}
+
+void Chip8::setProgramCounter(unsigned short value) {
+    this->pc = value;
+}
diff --git a/src/display.cpp b/src/display.cpp
index e44da3f..376d3bd 100644
--- a/src/display.cpp
+++ b/src/display.cpp
@@ -1,6 +1,6 @@
 #include "../include/display.h"
 
-void Display::draw(SDL_Renderer * renderer, const Chip8& chip8) {
+void Display::draw(SDL_Renderer * renderer) {
     SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
     SDL_RenderClear(renderer);
     SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
diff --git a/src/instruction_handler.cpp b/src/instruction_handler.cpp
index 2cf21f0..235b00b 100644
--- a/src/instruction_handler.cpp
+++ b/src/instruction_handler.cpp
@@ -6,7 +6,7 @@ InstructionHandler::InstructionHandler() {
     this->handlers[0x0000] = handle0000;
 }
 
-void InstructionHandler::handleInstruction(unsigned short instructionNumber, const Chip8& chip8, Instruction instruction) {
+void InstructionHandler::handleInstruction(unsigned short instructionNumber, Chip8& chip8, Instruction instruction) {
     if (!this->handlers.contains(instructionNumber)) {
         Logger::error("Unregistered instruction", instructionNumber);
         return;
@@ -15,13 +15,13 @@ void InstructionHandler::handleInstruction(unsigned short instructionNumber, con
     this->handlers[instructionNumber](chip8, instruction);
 }
 
-void InstructionHandler::handle0000(const Chip8& chip8, Instruction instruction) {
+void InstructionHandler::handle0000(Chip8& chip8, Instruction instruction) {
     switch (instruction.kk()) {
         case 0x00E0:
-            chip8.getDisplay()->clear();
+            chip8.getDisplay().clear();
             break;
         case 0x00EE:
-
+            chip8.setProgramCounter(chip8.popFromStack());
             break;
     }
 }