diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index 13f6a6fc1..c789dfbe9 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -246,7 +246,10 @@ void generalDefault()
   memclear(&g_eeGeneral, sizeof(g_eeGeneral));
   g_eeGeneral.version  = EEPROM_VER;
   g_eeGeneral.variant = EEPROM_VARIANT;
+
+#if !defined(PCBHORUS)
   g_eeGeneral.contrast = 25;
+#endif
 
 #if defined(PCBFLAMENCO)
   g_eeGeneral.vBatWarn = 33;
@@ -1055,7 +1058,7 @@ void doSplash()
 
 #if defined(PCBSTD)
     lcdSetContrast();
-#elif !defined(PCBTARANIS)
+#elif !defined(PCBHORUS) && !defined(PCBTARANIS)
     tmr10ms_t curTime = get_tmr10ms() + 10;
     uint8_t contrast = 10;
     lcdSetRefVolt(contrast);
@@ -1105,7 +1108,7 @@ void doSplash()
       }
 #endif
 
-#if !defined(PCBTARANIS) && !defined(PCBSTD)
+#if !defined(PCBHORUS) && !defined(PCBTARANIS) && !defined(PCBSTD)
       if (curTime < get_tmr10ms()) {
         curTime += 10;
         if (contrast < g_eeGeneral.contrast) {
@@ -1975,6 +1978,11 @@ uint8_t calcStickScroll( uint8_t index )
 
 void opentxStart()
 {
+#if defined(SIMU)
+  if (main_thread_running == 2)
+    return;
+#endif
+
   doSplash();
 
 #if defined(DEBUG_TRACE_BUFFER)
@@ -2673,7 +2681,7 @@ int main()
   MCUCSR = 0;
 #endif
 #if defined(PCBTARANIS)
-  g_eeGeneral.contrast=30;
+  g_eeGeneral.contrast = 30;
 #endif
   wdt_disable();
 
diff --git a/radio/src/targets/simu/simpgmspace.cpp b/radio/src/targets/simu/simpgmspace.cpp
index 7d0a29217..9dbbbfc64 100644
--- a/radio/src/targets/simu/simpgmspace.cpp
+++ b/radio/src/targets/simu/simpgmspace.cpp
@@ -79,11 +79,6 @@ Adc Adc0;
   uint8_t * eeprom_buffer_data;
   volatile int32_t eeprom_buffer_size;
   bool eeprom_read_operation;
-  #define EESIZE_SIMU (128*4096) // TODO why here?
-#endif
-
-#if !defined(EESIZE_SIMU)
-  #define EESIZE_SIMU EESIZE
 #endif
 
 #if defined(SDCARD) && !defined(SKIP_FATFS_DECLARATION)
@@ -336,7 +331,10 @@ void *eeprom_write_function(void *)
 
 void StartSimu(bool tests)
 {
-  main_thread_running = (tests ? 1 : 2);
+  s_current_protocol[0] = 255;
+  menuLevel = 0;
+
+  main_thread_running = (tests ? 1 : 2); // TODO rename to simu_run_mode with #define
 
 #if defined(SDCARD)
   if (strlen(simuSdDirectory) == 0) {
@@ -385,7 +383,11 @@ void StartSimu(bool tests)
 void StopSimu()
 {
   main_thread_running = 0;
-#if !defined(CPUARM)
+
+#if defined(CPUARM)
+  pthread_join(mixerTaskId, NULL);
+  pthread_join(menusTaskId, NULL);
+#else
   pthread_join(main_thread_pid, NULL);
 #endif
 }
diff --git a/radio/src/targets/simu/simpgmspace.h b/radio/src/targets/simu/simpgmspace.h
index 75b04dca7..c1e6c17bd 100644
--- a/radio/src/targets/simu/simpgmspace.h
+++ b/radio/src/targets/simu/simpgmspace.h
@@ -336,6 +336,7 @@ extern volatile unsigned char pina, pinb, pinc, pind, pine, pinf, ping, pinh, pi
 extern uint8_t portb, portc, porth, dummyport;
 extern uint16_t dummyport16;
 extern uint8_t main_thread_running;
+extern char * main_thread_error;
 
 #define getADC()
 #define getADC_bandgap()
@@ -362,6 +363,13 @@ void StopEepromThread();
   #define StopAudioThread()
 #endif
 
+#if !defined(EEPROM_RLC)
+  #define EESIZE_SIMU (128*4096)
+#else
+  #define EESIZE_SIMU EESIZE
+#endif
+
+extern uint8_t eeprom[EESIZE_SIMU];
 extern const char * eepromFile;
 void eepromReadBlock (uint8_t * pointer_ram, uint32_t address, uint32_t size);
 
diff --git a/radio/src/tasks_arm.cpp b/radio/src/tasks_arm.cpp
index a1603af99..99236dace 100644
--- a/radio/src/tasks_arm.cpp
+++ b/radio/src/tasks_arm.cpp
@@ -97,6 +97,11 @@ void mixerTask(void * pdata)
 
   while(1) {
 
+#if defined(SIMU)
+    if (main_thread_running == 0)
+      return;
+#endif
+
     if (!s_pulses_paused) {
       uint16_t t0 = getTmr2MHz();
 
@@ -149,6 +154,11 @@ void menusTask(void * pdata)
     if (runtime < MENU_TASK_PERIOD_TICKS) {
       CoTickDelay(MENU_TASK_PERIOD_TICKS - runtime);
     }
+
+#if defined(SIMU)
+    if (main_thread_running == 0)
+      return;
+#endif
   }
 
 #if defined(PCBTARANIS) && defined(REV9E)