diff --git a/file.cpp b/file.cpp
new file mode 100644
index 0000000..4fbbdc7
--- /dev/null
+++ b/file.cpp
@@ -0,0 +1,275 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdint.h>
+#include "file.h"
+#include <sys/stat.h>
+#include <unistd.h>
+#include <iostream>
+#include <fstream>
+#include <filesystem>
+#include <string>
+#include <vector>
+
+#ifndef _WIN32
+#include <pwd.h>
+#endif
+
+#define DEFAULT_FILENAME    "data.jf2"
+#define DEFAULT_FOLDER      "data/"
+#define CONFIG_FILENAME      "config.txt"
+
+namespace file
+{
+	struct file_t
+	{
+		std::string     path;
+		uint32_t    	size;
+		uint32_t    	offset;
+	};
+
+	std::vector<file_t> toc;
+
+	/* El std::map me fa coses rares, vaig a usar un good old std::vector amb una estructura key,value propia i au, que sempre funciona */
+	struct keyvalue_t {
+		std::string key, value;
+	};
+
+	char *resource_filename = NULL;
+	char *resource_folder = NULL;
+	int file_source = SOURCE_FILE;
+	char scratch[255];
+	static std::string config_folder;
+	std::vector<keyvalue_t> config;
+
+	void setResourceFilename(const char *str) {
+		if (resource_filename != NULL) free(resource_filename);
+		resource_filename = (char*)malloc(strlen(str)+1);
+		strcpy(resource_filename, str);
+	}
+
+	void setResourceFolder(const char *str) {
+		if (resource_folder != NULL) free(resource_folder);
+		resource_folder = (char*)malloc(strlen(str)+1);
+		strcpy(resource_folder, str);
+	}
+
+	void setSource(const int src) {
+		file_source = src%2; // mod 2 so it always is a valid value, 0 (file) or 1 (folder)
+		if (src==SOURCE_FOLDER && resource_folder==NULL) setResourceFolder(DEFAULT_FOLDER);
+	}
+
+	bool getDictionary() {
+		if (resource_filename == NULL) setResourceFilename(DEFAULT_FILENAME);
+
+		std::ifstream fi (resource_filename, std::ios::binary);
+		if (!fi.is_open()) return false;
+		char header[4];
+		fi.read(header, 4);
+		uint32_t num_files, toc_offset;
+		fi.read((char*)&num_files, 4);
+		fi.read((char*)&toc_offset, 4);
+		fi.seekg(toc_offset);
+
+		for (uint i=0; i<num_files; ++i) 
+		{
+			uint32_t file_offset, file_size;
+			fi.read( (char*)&file_offset, 4 );
+			fi.read( (char*)&file_size, 4 );
+			uint8_t path_size;
+			fi.read( (char*)&path_size, 1 );
+			char file_name[path_size+1];
+			fi.read( file_name, path_size );
+			file_name[path_size] = 0;
+			std::string filename = file_name;
+			toc.push_back({filename, file_size, file_offset});
+		}
+		fi.close();
+		return true;
+	}
+
+	char *getFilenameWithFolder(const char* filename) {
+		strcpy(scratch, resource_folder);
+		strcat(scratch, filename);
+		return scratch;
+	}
+
+	FILE *getFilePointer(const char *resourcename, int& filesize, const bool binary) {
+
+		if (file_source==SOURCE_FILE and toc.size()==0) {
+			if (not getDictionary()) setSource(SOURCE_FOLDER);
+		}
+
+		FILE *f;
+
+		if (file_source==SOURCE_FILE) {
+			bool found = false;
+			uint32_t count = 0;
+			while( !found && count < toc.size() ) {
+				found = ( std::string(resourcename) == toc[count].path );
+				if( !found ) count++;
+			}
+
+			if( !found ) {
+				perror("El recurs no s'ha trobat en l'arxiu de recursos");
+				exit(1);
+			}
+
+			filesize = toc[count].size;
+
+			f = fopen(resource_filename, binary?"rb":"r");
+			if (not f) {
+				perror("No s'ha pogut obrir l'arxiu de recursos");
+				exit(1);
+			}
+			fseek(f, toc[count].offset, SEEK_SET);
+		} else {
+			f = fopen(getFilenameWithFolder(resourcename), binary?"rb":"r");
+			fseek(f, 0, SEEK_END);
+			filesize = ftell(f);
+			fseek(f, 0, SEEK_SET);
+		}
+		return f;
+	}
+
+	char *getFileBuffer(const char *resourcename, int& filesize, const bool zero_terminate) {
+		FILE *f = getFilePointer(resourcename, filesize, true);
+		char* buffer = (char*)malloc(zero_terminate?filesize+1:filesize);
+		fread(buffer, filesize, 1, f);
+		if (zero_terminate) buffer[filesize]=0;
+		fclose(f);
+		return buffer;
+	}
+
+	// Crea la carpeta del sistema donde guardar datos
+	void setConfigFolder(const char *foldername)
+	{
+	#ifdef _WIN32
+		config_folder = std::string(getenv("APPDATA")) + "/" + foldername;
+	#elif __APPLE__
+		struct passwd *pw = getpwuid(getuid());
+		const char *homedir = pw->pw_dir;
+		config_folder = std::string(homedir) + "/Library/Application Support/" + foldername;
+	#elif __linux__
+		struct passwd *pw = getpwuid(getuid());
+		const char *homedir = pw->pw_dir;
+		config_folder = std::string(homedir) + "/." + foldername;
+	#endif
+
+		struct stat st = {0};
+		if (stat(config_folder.c_str(), &st) == -1)
+		{
+	#ifdef _WIN32
+			int ret = mkdir(config_folder.c_str());
+	#else
+			int ret = mkdir(config_folder.c_str(), S_IRWXU);
+	#endif
+
+			if (ret == -1)
+			{
+				printf("ERROR CREATING CONFIG FOLDER.");
+				exit(EXIT_FAILURE);
+			}
+		}
+	}
+
+	const char *getConfigFolder() {
+		std::string folder = config_folder + "/";
+		return folder.c_str();
+	}
+
+	void loadConfigValues() {
+		config.clear();
+		std::string config_file = config_folder + "/config.txt";
+		FILE *f = fopen(config_file.c_str(), "r");
+		if (!f) return;
+
+		char line[1024];
+		while (fgets(line, sizeof(line), f)) {
+			char *value = strchr(line, '=');
+			if (value) {
+				*value='\0'; value++;
+				value[strlen(value)-1] = '\0';
+				config.push_back({line, value});
+			}
+		}
+		fclose(f);
+	}
+
+	void saveConfigValues() {
+		std::string config_file = config_folder + "/config.txt";
+		FILE *f = fopen(config_file.c_str(), "w");
+		if (f) {
+			for (auto pair : config) {
+				fprintf(f, "%s=%s\n", pair.key.c_str(), pair.value.c_str());
+			}
+			fclose(f);
+		}
+	}
+
+	const char* getConfigValueString(const char *key) {
+		if (config.empty()) loadConfigValues();
+		for (auto pair : config) {
+			if (pair.key == std::string(key)) {
+				strcpy(scratch, pair.value.c_str());
+				return scratch;
+			}
+		}
+		return NULL;
+	}
+
+    const int getConfigValueInteger(const char *key, const int default_value)
+	{
+		const char* value = getConfigValueString(key);
+		if (!value) return default_value;
+		return atoi(value);
+	}
+
+    const float getConfigValueFloat(const char *key, const float default_value)
+	{
+		const char* value = getConfigValueString(key);
+		if (!value) return default_value;
+		return atof(value);
+	}
+
+    const bool getConfigValueBool(const char *key, const bool default_value)
+	{
+		const char* value = getConfigValueString(key);
+		if (!value) return default_value;
+		return strcmp(value, "true")==0?true:false;
+	}
+
+	void setConfigValueString(const char* key, const char* value) {
+		if (config.empty()) loadConfigValues();
+		for (auto &pair : config) {
+			if (pair.key == std::string(key)) {
+				pair.value = value;
+				saveConfigValues();
+				return;
+			}
+		}
+		config.push_back({key, value});
+		saveConfigValues();
+		return;
+	}
+
+	void setConfigValueInteger(const char* key, const int value)
+	{
+		char tmp[256];
+		sprintf(tmp, "%i", value);
+		setConfigValueString(key, tmp);
+	}
+
+    void setConfigValueFloat(const char* key, const float value)
+	{
+		char tmp[256];
+		sprintf(tmp, "%.2f", value);
+		setConfigValueString(key, tmp);
+	}
+
+    void setConfigValueBool(const char* key, const bool value)
+	{
+		setConfigValueString(key, value?"true":"false");
+	}
+
+}
diff --git a/file.h b/file.h
new file mode 100644
index 0000000..863254a
--- /dev/null
+++ b/file.h
@@ -0,0 +1,27 @@
+#pragma once
+#include <stdio.h>
+
+#define SOURCE_FILE         0
+#define SOURCE_FOLDER       1
+
+namespace file
+{
+    void setConfigFolder(const char *foldername);
+    const char *getConfigFolder();
+
+    void setResourceFilename(const char *str);
+    void setResourceFolder(const char *str);
+    void setSource(const int src);
+
+    FILE *getFilePointer(const char *resourcename, int& filesize, const bool binary=false);
+    char *getFileBuffer(const char *resourcename, int& filesize, const bool zero_terminate=false);
+
+    const char* getConfigValueString(const char *key);
+    const int getConfigValueInteger(const char *key, const int default_value=0);
+    const float getConfigValueFloat(const char *key, const float default_value=0.0f);
+    const bool getConfigValueBool(const char *key, const bool default_value=false);
+    void setConfigValueString(const char* key, const char* value);
+    void setConfigValueInteger(const char* key, const int value);
+    void setConfigValueFloat(const char* key, const float value);
+    void setConfigValueBool(const char* key, const bool value);
+}
diff --git a/main.cpp b/main.cpp
index 0ba403d..304aaed 100644
--- a/main.cpp
+++ b/main.cpp
@@ -21,6 +21,7 @@
 //#include "zx_128pageviewer.h"
 #include "ay-3-8912.h"
 #include "ay_viewer.h"
+#include "file.h"
 
 //uint8_t memory[65536];
 uint32_t time = 0;
@@ -84,6 +85,8 @@ int main(int argc, char *argv[])
     const uint32_t clock = 3546900;
     const uint32_t update_freq = clock / 10;
 
+    file::setConfigFolder("z80");
+
     //new zx_48mem();
     //new zx_128mem();
     mem::init(ZX_128K);
diff --git a/z80debug.cpp b/z80debug.cpp
index 4b0b419..cafacd8 100644
--- a/z80debug.cpp
+++ b/z80debug.cpp
@@ -11,6 +11,7 @@
 #include "ui_window.h"
 #include "zx_screen.h"
 #include "ay-3-8912.h"
+#include "file.h"
 
 #define RESIZING_NONE       0
 #define RESIZING_MEMORY     1
@@ -28,7 +29,7 @@ namespace z80debug
     int mem_h = 8;
     int con_h = 6;
     int sym_h = 14;
-
+    int zoom = 1;
     int resizing_type = RESIZING_MEMORY;
     bool resizing = false;
 
@@ -94,6 +95,15 @@ namespace z80debug
         return temp;
     }
 
+    void saveWindowConfiguration()
+    {
+        file::setConfigValueInteger("debug_zoom", zoom);
+        int x, y;
+        SDL_GetWindowPosition(win, &x, &y);
+        file::setConfigValueInteger("debug_x", x);
+        file::setConfigValueInteger("debug_y", y);
+    }
+
     bool eventHandler(SDL_Event *e)
     {
         if (e->type == SDL_MOUSEMOTION) {
@@ -104,7 +114,7 @@ namespace z80debug
                 if ((e->window.event==SDL_WINDOWEVENT_SHOWN) || (e->window.event==SDL_WINDOWEVENT_EXPOSED)) {
                     int w; int h;
                     SDL_GetWindowSize(win, &w, &h);
-                    w/=2; h/=2;
+                    w/=zoom; h/=zoom;
                     midx = (w/CHR_W) - 25;
                     win_h = (h/CHR_H);
                     mem_y = win_h - mem_h - con_h;
@@ -115,6 +125,8 @@ namespace z80debug
                 } else if (e->window.event == SDL_WINDOWEVENT_CLOSE) {
                     hide();
                     zxscreen::focus();
+                } else if (e->window.event == SDL_WINDOWEVENT_FOCUS_LOST) {
+                    saveWindowConfiguration();
                 }
             }
             if (e->type == SDL_MOUSEWHEEL) {
@@ -144,9 +156,15 @@ namespace z80debug
                     z80debug::refresh();
                     z80analyze::refresh();
                 } else if (e->key.keysym.scancode==SDL_SCANCODE_F2) {
-                    z80debug::history::goback();
-                    z80debug::refresh();
-                    z80analyze::refresh();
+                    if (e->key.keysym.mod & KMOD_CTRL) {
+                        zoom = zoom==1?2:1;
+                        hide();
+                        show();
+                    } else {
+                        z80debug::history::goback();
+                        z80debug::refresh();
+                        z80analyze::refresh();
+                    }
                 } else if (e->key.keysym.scancode==SDL_SCANCODE_F3) {
                     z80debug::history::goforward();
                     z80debug::refresh();
@@ -333,7 +351,10 @@ namespace z80debug
     void show()
     {
         if (!win) {
-            win = SDL_CreateWindow("Z80 Debugger", 10, 50, 98*CHR_W*2, 44*CHR_H*2, SDL_WINDOW_SHOWN);
+            zoom = file::getConfigValueInteger("debug_zoom", 1);
+            const int x = file::getConfigValueInteger("debug_x", SDL_WINDOWPOS_UNDEFINED);
+            const int y = file::getConfigValueInteger("debug_y", SDL_WINDOWPOS_UNDEFINED);
+            win = SDL_CreateWindow("Z80 Debugger", x, y, 98*CHR_W*zoom, 44*CHR_H*zoom, SDL_WINDOW_SHOWN);
             ren = SDL_CreateRenderer(win, -1, 0);
             SDL_RenderSetLogicalSize(ren, 98*CHR_W, 44*CHR_H);
             ui::window::registerWindow(SDL_GetWindowID(win), eventHandler);
@@ -353,6 +374,7 @@ namespace z80debug
 
     void hide()
     {
+        saveWindowConfiguration();
         ui::window::unregisterWindow(SDL_GetWindowID(win));
         if (tex) SDL_DestroyTexture(tex);
         if (ren) SDL_DestroyRenderer(ren);
diff --git a/zx_screen.cpp b/zx_screen.cpp
index 7f23c8d..b436408 100644
--- a/zx_screen.cpp
+++ b/zx_screen.cpp
@@ -7,6 +7,7 @@
 #include "ui_window.h"
 #include "z80debug.h"
 #include "ui.h"
+#include "file.h"
 //#include "zx_128mem.h"
 
 namespace zxscreen
@@ -51,6 +52,15 @@ namespace zxscreen
     #define SCREEN_SYNC     0xFFFF
     #define SCREEN_BORDER   0xFFFE
 
+    void saveWindowConfiguration()
+    {
+        file::setConfigValueInteger("screen_zoom", zoom);
+        int x, y;
+        SDL_GetWindowPosition(win, &x, &y);
+        file::setConfigValueInteger("screen_x", x);
+        file::setConfigValueInteger("screen_y", y);
+    }
+
     void create_tables()
     {
         uint32_t count = 0;
@@ -119,7 +129,10 @@ namespace zxscreen
             //sprintf(tmp, " %ix%i", x, y);
             //setTitle(tmp);
             if (e->window.event==SDL_WINDOWEVENT_CLOSE) {
+                saveWindowConfiguration();
                 return false;
+            } else if (e->window.event==SDL_WINDOWEVENT_FOCUS_LOST || e->window.event==SDL_WINDOWEVENT_MOVED) {
+                saveWindowConfiguration();
             } else if ((e->window.event==SDL_WINDOWEVENT_SHOWN) || (e->window.event==SDL_WINDOWEVENT_EXPOSED)) {
                 redraw();
             }
@@ -160,6 +173,7 @@ namespace zxscreen
 
     void reinit()
     {
+        saveWindowConfiguration();
         if (win) ui::window::unregisterWindow(SDL_GetWindowID(win));
 
         if (tex) SDL_DestroyTexture(tex);
@@ -167,8 +181,12 @@ namespace zxscreen
         if (ren) SDL_DestroyRenderer(ren);
         if (win) SDL_DestroyWindow(win);
 
+        zoom = file::getConfigValueInteger("screen_zoom", 1);
+        const int x = file::getConfigValueInteger("screen_x", SDL_WINDOWPOS_UNDEFINED);
+        const int y = file::getConfigValueInteger("screen_y", SDL_WINDOWPOS_UNDEFINED);
+
         const int z = fullscreen ? 1 : zoom;
-        win = SDL_CreateWindow("ZX Spectrum Screen", 1216, 565, 352*z, 296*z, fullscreen?SDL_WINDOW_FULLSCREEN_DESKTOP:SDL_WINDOW_ALLOW_HIGHDPI);
+        win = SDL_CreateWindow("ZX Spectrum Screen", x, y, 352*z, 296*z, fullscreen?SDL_WINDOW_FULLSCREEN_DESKTOP:SDL_WINDOW_ALLOW_HIGHDPI);
         ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
         tex = SDL_CreateTexture(ren, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 352, 296);
         uitex = ui::createtexture(ren);