diff --git a/firmware/applications/exe.c b/firmware/applications/exe.c
new file mode 100644
index 0000000..c5fbc47
--- /dev/null
+++ b/firmware/applications/exe.c
@@ -0,0 +1,162 @@
+#include <sysinit.h>
+
+#include "basic/basic.h"
+
+#include "lcd/lcd.h"
+#include "lcd/allfonts.h"
+
+#include "usb/usbmsc.h"
+
+#include "filesystem/ff.h"
+
+/**************************************************************************/
+
+void put_rc_y (FRESULT rc, int y) {
+	const TCHAR *p =
+		_T("OK\0DISK_ERR\0INT_ERR\0NOT_READY\0NO_FILE\0NO_PATH\0INVALID_NAME\0")
+		_T("DENIED\0EXIST\0INVALID_OBJECT\0WRITE_PROTECTED\0INVALID_DRIVE\0")
+		_T("NOT_ENABLED\0NO_FILE_SYSTEM\0MKFS_ABORTED\0TIMEOUT\0LOCKED\0")
+		_T("NOT_ENOUGH_CORE\0TOO_MANY_OPEN_FILES\0");
+	FRESULT i;
+
+	for (i = 0; i != rc && *p; i++) {
+		while(*p++) ;
+	}
+    DoString(0,y,p);
+}
+
+void put_rc (FRESULT rc){
+    put_rc_y(rc,0);
+};
+
+
+extern void * sram_top;
+void execute_file (const char * fname){
+    FRESULT res;
+    FIL file;
+    UINT readbytes;
+    void (*dst)(void);
+
+    dst=(void (*)(void)) (sram_top);
+
+    res=f_open(&file, fname, FA_OPEN_EXISTING|FA_READ);
+    put_rc(res);
+    if(res){
+        return;
+    };
+
+    res = f_read(&file, (char *)dst, RAMCODE, &readbytes);
+    put_rc_y(res,8);
+    if(res){
+        return;
+    };
+
+    int dx;
+    dx=DoString(0,16,"read: ");
+    DoInt(dx,16,readbytes);
+    lcdDisplay(0);
+
+    dst=(void (*)(void)) ((uint32_t)(dst) | 1); // Enable Thumb mode!
+    dst();
+
+    getInput();
+};
+
+/**************************************************************************/
+
+void execute_menu(void){
+//    int dx=0;
+    int dy=0;
+
+    DoString(0,dy,"Enter RAM!");dy+=8;
+    lcdDisplay(0);
+    while(getInput()!=BTN_NONE);
+
+    FATFS FatFs;          /* File system object for logical drive */
+    put_rc(f_mount(0, &FatFs));
+
+    execute_file("0:test.c0d");
+    lcdDisplay(0);
+    while(!getInput());
+};
+
+void msc_menu(void){
+    DoString(0,8,"MSC Enabled.");
+    lcdDisplay(0);
+    usbMSCInit();
+    getInputWait();
+    DoString(0,16,"MSC Disabled.");
+    usbMSCOff();
+};
+
+void gotoISP(void) {
+    DoString(0,0,"Enter ISP!");
+    lcdDisplay(0);
+    ISPandReset(5);
+}
+
+void lcd_mirror(void) {
+    lcdToggleFlag(LCD_MIRRORX);
+};
+
+void adc_check(void) {
+    int dx=0;
+    int dy=8;
+    // Print Voltage
+    dx=DoString(0,dy,"Voltage:");
+    while ((getInputRaw())==BTN_NONE){
+        DoInt(dx,dy,GetVoltage());
+        lcdDisplay(0);
+    };
+    dy+=8;
+    dx=DoString(0,dy,"Done.");
+};
+
+/**************************************************************************/
+
+const struct MENU_DEF menu_ISP =    {"Invoke ISP",  &gotoISP};
+const struct MENU_DEF menu_mirror = {"Mirror",   &lcd_mirror};
+const struct MENU_DEF menu_volt =   {"Akku",   &adc_check};
+const struct MENU_DEF menu_nop =    {"---",   NULL};
+const struct MENU_DEF menu_msc =   {"MSC",   &msc_menu};
+const struct MENU_DEF menu_exe =   {"Exec",   &execute_menu};
+
+static menuentry menu[] = {
+    &menu_msc,
+    &menu_exe,
+    &menu_nop,
+    &menu_mirror,
+    &menu_volt,
+    &menu_ISP,
+    NULL,
+};
+
+static const struct MENU mainmenu = {"Mainmenu", menu};
+
+void main_exe(void) {
+
+    lcdSetPixel(0,0,0);
+
+    backlightInit();
+    font=&Font_7x8;
+
+    while (1) {
+        lcdFill(0); // clear display buffer
+        lcdDisplay(0);
+        handleMenu(&mainmenu);
+        gotoISP();
+    }
+};
+
+void tick_exe(void){
+    static int foo=0;
+    static int toggle=0;
+	if(foo++>50){
+        toggle=1-toggle;
+		foo=0;
+        gpioSetValue (RB_LED0, toggle); 
+	};
+    return;
+};
+
+