diff --git a/src/computer.c b/src/computer.c
index 032ceba..f6d20ef 100644
--- a/src/computer.c
+++ b/src/computer.c
@@ -1275,7 +1275,7 @@ void Z80free_Out (register word Port, register byte Value) {
 	
 	register word maskport;
 	
-	if (((Port&0x0001)==0)||((Port>=0x4000)&&(Port<0x8000))) {
+	if (((Port&0x0001)==0)||((Port>=0x4000)&&(Port<0x8000))||Port == 0xBF3B||Port == 0xFF3B) {
 		do_contention();
 	}
 
@@ -1348,7 +1348,7 @@ byte Z80free_In (register word Port) {
 	static unsigned int temporal_io;
 	byte pines;
 
-	if (((Port&0x0001)==0)||((Port>=0x4000)&&(Port<0x8000))) {
+	if (((Port&0x0001)==0)||((Port>=0x4000)&&(Port<0x8000))||Port == 0xFF3B) {
 		do_contention();
 	}
 
diff --git a/src/gui_sdl.c b/src/gui_sdl.c
index 87c52ee..0cf6c11 100644
--- a/src/gui_sdl.c
+++ b/src/gui_sdl.c
@@ -79,7 +79,7 @@ static const char *emulation_messages[] = {
 		/*04*/		"Tap fast speed",
 		/*05*/		"^|on|off",
 		/*06*/		"Turbo mode",
-		/*07*/		"^|on|off",
+		/*07*/		"^|off|speed|ultraspeed",
 		/*08*/		"Double scan",
 		/*09*/		"^|on|off",
 		/*10*/		"TV mode",
@@ -374,7 +374,7 @@ static void emulation_settings(void)
 	submenus[0] = get_machine_model();
 	submenus[1] = ordenador.volume/2;
 	submenus[2] = !ordenador.tape_fast_load;
-	submenus[3] = !ordenador.turbo;
+	submenus[3] = ordenador.turbo;
 	submenus[4] = !ordenador.dblscan;
 	submenus[5] = ordenador.bw;
 	submenus[6] = !ordenador.ay_emul;
@@ -392,16 +392,26 @@ static void emulation_settings(void)
 	
 	ordenador.volume = submenus[1]*2; //I should use set_volume() ?
 	ordenador.tape_fast_load = !submenus[2];
-	ordenador.turbo = !submenus[3];
+	ordenador.turbo = submenus[3];
 	
-	if(ordenador.turbo){
-				ordenador.tst_sample=12000000/ordenador.freq; //5,0 MHz max emulation speed for wii at full frames
-				jump_frames=3;
-			} else {
-				ordenador.tst_sample=3500000/ordenador.freq;
-				jump_frames=0;
-				curr_frames=0;
-			}
+	curr_frames=0;
+	switch(ordenador.turbo)
+	{
+	case 0: //off
+		ordenador.tst_sample=3500000/ordenador.freq;
+		jump_frames=0;
+		break;	
+	case 1:	//speed	
+		ordenador.tst_sample=12000000/ordenador.freq; //5,0 MHz max emulation speed for wii at full frames
+		jump_frames=3;
+		break;
+	case 2:	//very speed
+		ordenador.tst_sample=20000000/ordenador.freq;
+		jump_frames=24;
+		break;
+	default:
+		break;	
+	}
 	
 	ordenador.dblscan = !submenus[4];
 	ordenador.bw = submenus[5]; 
diff --git a/src/menus.c b/src/menus.c
index b5545db..5adcf6d 100644
--- a/src/menus.c
+++ b/src/menus.c
@@ -282,15 +282,15 @@ void settings_menu() {
 			computer_set_palete();
 		break;
 		case SDLK_t:
+			curr_frames=0;
 			if(ordenador.turbo){
 				ordenador.tst_sample=3500000/ordenador.freq;
 				ordenador.turbo = 0;
 				jump_frames=0;
-				curr_frames=0;
 			} else {
 				ordenador.tst_sample=12000000/ordenador.freq; //5,0 MHz max emulation speed for wii at full frames
 				ordenador.turbo = 1;
-				jump_frames=3;
+				jump_frames=3;	
 			}
 		break;	
 		}