diff --git a/128k.rom b/128k.rom
new file mode 100644
index 0000000..1ddee8c
Binary files /dev/null and b/128k.rom differ
diff --git a/main.cpp b/main.cpp
index 236d50f..b897ea4 100644
--- a/main.cpp
+++ b/main.cpp
@@ -84,7 +84,7 @@ int main(int argc, char *argv[])
 
     SDL_Init(SDL_INIT_EVERYTHING);
     z80debug::init();
-    zxscreen::init(0x4000, 0x5800);
+    zxscreen::init(SCREEN_MODE_48K);
 
     ui::menu::init();
     ui::menu::setexitcallback(actions::exitMenu);
diff --git a/z80mem.h b/z80mem.h
index b1a50c6..b41a19e 100644
--- a/z80mem.h
+++ b/z80mem.h
@@ -34,6 +34,8 @@ class z80mem
         virtual void loadState(FILE* f) = 0;
 
         virtual uint32_t getSize() = 0;
+
+        virtual uint8_t *rawPtr(uint32_t address) = 0;
     
     protected:
 
diff --git a/zx_48mem.cpp b/zx_48mem.cpp
index 24afe3d..fa1e612 100644
--- a/zx_48mem.cpp
+++ b/zx_48mem.cpp
@@ -59,3 +59,7 @@ uint32_t zx_48mem::getSize()
     return 65536;
 }
 
+uint8_t *zx_48mem::rawPtr(uint32_t address)
+{
+    return &memory[address];
+}
\ No newline at end of file
diff --git a/zx_48mem.h b/zx_48mem.h
index b1fa26f..5309b20 100644
--- a/zx_48mem.h
+++ b/zx_48mem.h
@@ -20,7 +20,9 @@ class zx_48mem : public z80mem
         void loadState(FILE* f);
 
         uint32_t getSize();
-    
+
+        uint8_t *rawPtr(uint32_t address);
+
     protected:
 
         uint8_t memory[65536];
diff --git a/zx_screen.cpp b/zx_screen.cpp
index ba96ca9..1d8ec28 100644
--- a/zx_screen.cpp
+++ b/zx_screen.cpp
@@ -19,6 +19,12 @@ namespace zxscreen
     SDL_Texture *tex = nullptr;
     SDL_Texture *uitex = nullptr;
 
+    int mode = SCREEN_MODE_48K;
+    
+    uint32_t t_states_total = 69888;
+    uint32_t t_states_per_scanline = 224;
+    uint32_t vsync_lines = 16;
+
     uint8_t zoom = 1;
     bool fullscreen = false;
     bool full_refresh = true;
@@ -36,8 +42,8 @@ namespace zxscreen
     uint16_t pixel_base_addr = 0x4000;
     uint16_t color_base_addr = 0x5800;
 
-    uint16_t pixel_addr[69888];
-    uint16_t color_addr[69888];
+    uint16_t *pixel_addr = nullptr; //[69888];
+    uint16_t *color_addr = nullptr; //[69888];
     uint8_t zx_pixels[352*296];
     uint8_t *ptr_pixel = zx_pixels;
 
@@ -48,16 +54,21 @@ namespace zxscreen
     {
         uint32_t count = 0;
 
+        if (pixel_addr) free(pixel_addr);
+        if (color_addr) free(color_addr);
+        pixel_addr = (uint16_t*)malloc(t_states_total*sizeof(uint16_t));
+        color_addr = (uint16_t*)malloc(t_states_total*sizeof(uint16_t));
+
         uint16_t *ptr_pixel = pixel_addr;
         uint16_t *ptr_color = color_addr;
 
         // vsync
-        for (int i=0; i<224*16;++i) { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_SYNC; }
+        for (int i=0; i<t_states_per_scanline*vsync_lines;++i) { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_SYNC; } // En el 128K 16 passa a ser 15 i 224 passa a ser 228
 
         // Upper border
         for (int i=0; i<48;++i) {
             // hsync
-            for (int j=0;j<48;++j)  { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_SYNC; }
+            for (int j=0;j<t_states_per_scanline-176;++j)  { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_SYNC; } // En el 128K 48 passsa a ser 52
             //border
             for (int j=0;j<176;++j) { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_BORDER; count+=2; }
         }
@@ -66,7 +77,7 @@ namespace zxscreen
         for (uint8_t y=0; y<192; ++y)
         {
             // hsync
-            for (int j=0;j<48;++j) { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_SYNC; }
+            for (int j=0;j<t_states_per_scanline-176;++j) { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_SYNC; } // En el 128K 48 passsa a ser 52
 
             // Left border
             for (int j=0;j<24;++j) { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_BORDER; count+=2; }
@@ -91,7 +102,7 @@ namespace zxscreen
         // Lower border
         for (int i=0; i<56;++i) {
             // hsync
-            for (int j=0;j<48;++j)  { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_SYNC; }
+            for (int j=0;j<t_states_per_scanline-176;++j)  { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_SYNC; } // En el 128K 48 passsa a ser 52
             //border
             for (int j=0;j<176;++j) { *(ptr_pixel++) = 0; *(ptr_color++) = SCREEN_BORDER; count+=2; }
         }
@@ -178,15 +189,27 @@ namespace zxscreen
         focus();
     }
 
-    void setBaseAddresses(const uint16_t pixeladdr, const uint16_t coloraddr)
+    void setBaseAddresses(const uint32_t pixeladdr, const uint32_t coloraddr)
     {
         pixel_base_addr = pixeladdr;
         color_base_addr = coloraddr;
     }
 
-    void init(const uint16_t pixeladdr, const uint16_t coloraddr)
+    void init(int mode)
     {
-        setBaseAddresses(pixeladdr, coloraddr);
+        zxscreen::mode = mode;
+        if (mode==SCREEN_MODE_48K) {
+            setBaseAddresses(0x4000, 0x5800);
+            t_states_total = 69888;
+            t_states_per_scanline = 224;
+            vsync_lines = 16;
+        } else if (mode==SCREEN_MODE_128K) {
+            setBaseAddresses(0x14000, 0x15800);
+            t_states_total = 70908;
+            t_states_per_scanline = 228;
+            vsync_lines = 15;
+        }
+
         create_tables();
         reinit();
     }
@@ -202,7 +225,8 @@ namespace zxscreen
 
     void refresh(const uint32_t dt, const bool full)
     {
-        //const uint8_t* memory = z80mem::getRawPointer(0x4000);
+        const uint8_t* pixel_mem = z80mem::get()->rawPtr(pixel_base_addr);
+        const uint8_t* color_mem = z80mem::get()->rawPtr(color_base_addr);
         const uint8_t border_color = zx_ula::get_border_color();
 
         for (int i=0;i<dt;++i)
@@ -213,13 +237,13 @@ namespace zxscreen
                     *(ptr_pixel++) = border_color;
                     *(ptr_pixel++) = border_color;
                 } else {
-                    uint8_t color = z80mem::get()->readMem(color_base_addr + color_addr[t_screen]);
+                    uint8_t color = *(color_mem + color_addr[t_screen]); // z80mem::get()->readMem(color_base_addr + color_addr[t_screen]);
                     uint8_t c1 = color&0x7, c2 = (color>>3)&0x7;
                     if ((color&0x80) && flash) { c1=c2; c2=color&0x7; }
                     if ((color&0x40)) { c1 |= 0x8; c2 |= 0x8; }
                     uint16_t address = /*(0x4000) |*/ (pixel_addr[t_screen]&0x1FFF);
                     uint8_t mask = 1 << (pixel_addr[t_screen]>>13);
-                    uint8_t block = z80mem::get()->readMem(pixel_base_addr + address);
+                    uint8_t block = *(pixel_mem + address); // z80mem::get()->readMem(pixel_base_addr + address);
                     *(ptr_pixel++)=(block&mask) ? c1 : c2;
                     mask>>=1;
                     *(ptr_pixel++)=(block&mask) ? c1 : c2;
diff --git a/zx_screen.h b/zx_screen.h
index 6b4790e..57e6f4a 100644
--- a/zx_screen.h
+++ b/zx_screen.h
@@ -1,10 +1,13 @@
 #pragma once
 #include <SDL2/SDL.h>
 
+#define SCREEN_MODE_48K    0
+#define SCREEN_MODE_128K   1
+
 namespace zxscreen
 {
-    void init(const uint16_t pixeladdr, const uint16_t coloraddr);
-    void setBaseAddresses(const uint16_t pixeladdr, const uint16_t coloraddr);
+    void init(int mode);
+    void setBaseAddresses(const uint32_t pixeladdr, const uint32_t coloraddr);
     void reinit();
     void focus();
     void refresh(const uint32_t dt, const bool full=false);
diff --git a/zx_ula.cpp b/zx_ula.cpp
index 6b98bec..b41c3cd 100644
--- a/zx_ula.cpp
+++ b/zx_ula.cpp
@@ -1,5 +1,5 @@
 #include "zx_ula.h"
-#include <z80.h>
+#include "z80.h"
 #include <SDL2/SDL.h>
 
 #define AUDIO_BUFFER_SIZE 2048