diff --git a/atari2600.cpp b/atari2600.cpp
index 22010c6..567a0e4 100644
--- a/atari2600.cpp
+++ b/atari2600.cpp
@@ -44,7 +44,11 @@ namespace atari2600
 //        } else {
             bool instruction_done = false;
             while (!instruction_done) {
-                instruction_done = m6502::tick();
+                if (!tia::is_rdy_low()) {
+                    instruction_done = m6502::tick();
+                } else {
+                    instruction_done = true;
+                }
                 tia::tick();
                 tia::tick();
                 tia::tick();
diff --git a/tia.cpp b/tia.cpp
index 01fdcb1..23d82b7 100644
--- a/tia.cpp
+++ b/tia.cpp
@@ -2,6 +2,24 @@
 
 namespace tia
 {
+    uint8_t collisions[8] { 0, 0, 0, 0, 0, 0, 0, 0 };
+
+    float paddle_pos[4] { 0.5f, 0.5f, 0.5f, 0.5f };
+    uint32_t paddle_charge_cycles[4] { 0, 0, 0, 0 };
+
+    bool joy0_button_pressed = false;
+    bool joy1_button_pressed = false;
+
+    uint32_t current_frame_cycles = 0;
+
+    bool vsync_set = false;
+    bool vblank_set = false;
+    bool vblank_latch = false;
+    bool vblank_dump = false;
+
+    uint16_t color_clock = 0;
+    bool rdy_low = false;
+
     void reset()
     {
 
@@ -9,14 +27,41 @@ namespace tia
 
     void tick()
     {
+        if (!vblank_dump) current_frame_cycles++;
+        color_clock = (color_clock + 1) % 228;
 
+        if (color_clock == 0) rdy_low = false;
+
+        // [TODO] Pintar pixels
+    }
+
+
+    uint8_t get_paddle_state(int index)
+    {
+        if (vblank_dump) return 0x00;
+        return (current_frame_cycles >= paddle_charge_cycles[index]) ? 0x80 : 0x00;
     }
 
     uint8_t read(uint16_t address)
     {
-        address &= 0x0f;
+        switch (address & 0x0f) {
+            case 0x00: return collisions[0];
+            case 0x01: return collisions[2];
+            case 0x02: return collisions[3];
+            case 0x03: return collisions[4];
+            case 0x04: return collisions[5];
+            case 0x05: return collisions[6];
+            case 0x06: return collisions[7];
+            case 0x07: return collisions[8];
 
-        // [TODO] Procesar segons l'adreça resultant
+            case 0x08: return get_paddle_state(0);
+            case 0x09: return get_paddle_state(1);
+            case 0x0A: return get_paddle_state(2);
+            case 0x0B: return get_paddle_state(3);
+
+            case 0x0C: return joy0_button_pressed ? 0x00 : 0x80;
+            case 0x0D: return joy1_button_pressed ? 0x00 : 0x80;
+        }
     }
 
     void write(uint16_t address, uint8_t value)
@@ -25,6 +70,34 @@ namespace tia
         if (address >= 0x2d) address -= 0x20;
 
         // [TODO] Procesar segons l'adreça resultant
+        switch (address) {
+            case 0x00:  // VSYNC
+                vsync_set = value & 0x20;
+                break;
+
+            case 0x01:  // VBLANK
+                bool prev_dump = vblank_dump;
+                vblank_set = value & 0x20;
+                vblank_latch = value & 0x40;
+                vblank_dump = value & 0x80;
+                if (prev_dump && !vblank_dump) {
+                    current_frame_cycles = 0;
+                    for (int i = 0; i < 4; ++i) paddle_charge_cycles[i] = static_cast<uint32_t>(paddle_pos[i] * 2400.0f);
+                }
+                break;
+            
+            case 0x02: // WSYNC
+                rdy_low = true;
+                break;
+
+            case 0x03: // RSYNC
+                color_clock = 0;
+                break;
+        }
     }
 
+    bool is_rdy_low()
+    {
+        return rdy_low;
+    }
 }
diff --git a/tia.h b/tia.h
index 0c4605e..464ac49 100644
--- a/tia.h
+++ b/tia.h
@@ -7,4 +7,6 @@ namespace tia
     void tick();
     uint8_t read(uint16_t address);
     void write(uint16_t address, uint8_t value);
+
+    bool is_rdy_low();
 }