diff --git a/src/simpgmspace.cpp b/src/simpgmspace.cpp
index f4c2f1800..9f63f9d97 100644
--- a/src/simpgmspace.cpp
+++ b/src/simpgmspace.cpp
@@ -28,7 +28,7 @@
 #include "menus.h"
 
 volatile uint8_t pinb=0, pinc=0xff, pind, pine=0xff, ping=0xff, pinh=0xff, pinj=0xff, pinl=0;
-uint8_t portb, portc, dummyport;
+uint8_t portb, portc, porth=0, dummyport;
 uint16_t dummyport16;
 const char *eepromFile;
 
@@ -93,26 +93,39 @@ void *eeprom_write_function(void *)
 }
 
 uint8_t main_thread_running = 0;
+char * main_thread_error = NULL;
 void *main_thread(void *)
 {
-  g_menuStack[0] = menuMainView;
-  g_menuStack[1] = menuProcModelSelect;
+#ifdef SIMU_EXCEPTIONS
+  signal(SIGFPE, sig);
+  signal(SIGSEGV, sig);
 
-  eeReadAll(); //load general setup and selected model
+  try {
+#endif
+    g_menuStack[0] = menuMainView;
+    g_menuStack[1] = menuProcModelSelect;
 
-  if (main_thread_running == 1) {
-    doSplash();
-    checkLowEEPROM();
-    checkTHR();
-    checkSwitches();
-    checkAlarm();
+    eeReadAll(); //load general setup and selected model
+
+    if (main_thread_running == 1) {
+      doSplash();
+      checkLowEEPROM();
+      checkTHR();
+      checkSwitches();
+      checkAlarm();
+    }
+
+    while (main_thread_running) {
+      perMain();
+      usleep(1000);
+    }
+    return NULL;
+#ifdef SIMU_EXCEPTIONS
   }
-
-  while (main_thread_running) {
-    perMain();
-    usleep(1000);
+  catch (...) {
+    main_thread_running = 0;
   }
-  return NULL;
+#endif
 }
 
 pthread_t main_thread_pid;
diff --git a/src/simpgmspace.h b/src/simpgmspace.h
index 3207ed9f4..dafd0478f 100644
--- a/src/simpgmspace.h
+++ b/src/simpgmspace.h
@@ -22,7 +22,40 @@
 #ifndef simpgmspace_h
 #define simpgmspace_h
 
+#ifdef SIMU_EXCEPTIONS
+extern char * main_thread_error;
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#ifdef WIN32
+#define write_backtrace(output)
+#else
+#include <execinfo.h>
+inline void write_backtrace(char *output)
+{
+
+  void *buf[16];
+  char **s;
+  int n = backtrace(buf,16);
+  s = backtrace_symbols(buf, n);
+  if (s) {
+    for(int i=0; i<n; i++)
+      sprintf(output+strlen(output), "%02i: %s\n",i,s[i]);
+  }
+}
+#endif
+void sig(int sgn)
+{
+  main_thread_error = (char *)malloc(2048);
+  sprintf(main_thread_error,"Signal %d caught\n", sgn);
+  write_backtrace(main_thread_error);
+  throw std::exception();
+}
+#define assert(x) do { if (!(x)) { main_thread_error = (char *)malloc(2048); sprintf(main_thread_error, "Assert failed, %s:%d: %s\n", __FILE__, __LINE__, #x); write_backtrace(main_thread_error); throw std::exception(); } } while(0)
+#else
 #include <assert.h>
+#endif
+
 #include <inttypes.h>
 #include <stdio.h>
 #include <pthread.h>
@@ -64,7 +97,7 @@ extern sem_t eeprom_write_sem;
 #define PORTE dummyport
 #define PORTF dummyport
 #define PORTG dummyport
-#define PORTH dummyport
+#define PORTH porth
 #define DDRA  dummyport
 #define DDRB  dummyport
 #define DDRC  dummyport
@@ -131,7 +164,7 @@ extern sem_t eeprom_write_sem;
 #define INP_P_KEY_DWN   0
 
 extern volatile unsigned char pinb,pinc,pind,pine,ping,pinh,pinj,pinl;
-extern uint8_t portb, portc, dummyport;
+extern uint8_t portb, portc, porth, dummyport;
 extern uint16_t dummyport16;
 extern uint8_t main_thread_running;