diff --git a/radio/src/Makefile b/radio/src/Makefile
index 5d36bb5c7..da7ae5b4d 100644
--- a/radio/src/Makefile
+++ b/radio/src/Makefile
@@ -150,7 +150,7 @@ PWM_BACKLIGHT = NO
 
 # SPLASH on START
 # Values = YES, NO, FIXED
-SPLASH = YES
+SPLASH = $(GUI)
 
 # GRAPHICS (sliders / checkboxes / bold / batt graph)
 GRAPHICS = YES
@@ -389,7 +389,10 @@ ifeq ($(PCB), $(filter $(PCB), STD 9X 9XR))
   INCDIRS += targets/stock
   CPPDEFS = -DF_CPU=$(F_CPU)UL -DPCBSTD -DCPUM64 -DEEPROM_VARIANT=$(shell echo ${EEPROM_VARIANT} | bc)
   BOARDSRC = main_avr.cpp targets/stock/board_stock.cpp
-  EXTRABOARDSRC = targets/stock/lcd_driver.cpp targets/common_avr/telemetry_driver.cpp
+  EXTRABOARDSRC = targets/common_avr/telemetry_driver.cpp
+  ifeq ($(GUI), YES)
+    EXTRABOARDSRC += targets/stock/lcd_driver.cpp
+  endif
   EEPROMSRC = eeprom_common.cpp eeprom_rlc.cpp
   PULSESSRC = pulses/pulses_avr.cpp
   CPPSRC += debug.cpp
@@ -950,7 +953,13 @@ ifeq ($(GUI), YES)
   GUISRC = gui/$(GUIDIRECTORY)/helpers.cpp gui/$(GUIDIRECTORY)/navigation.cpp gui/$(GUIDIRECTORY)/popups.cpp gui/$(GUIDIRECTORY)/widgets.cpp gui/$(GUIDIRECTORY)/menus.cpp $(GUIMODELSRC) $(GUIGENERALSRC) gui/$(GUIDIRECTORY)/view_main.cpp gui/$(GUIDIRECTORY)/view_statistics.cpp
 endif
 
-CPPSRC += opentx.cpp functions.cpp strhelpers.cpp $(PULSESSRC) switches.cpp curves.cpp mixer.cpp stamp.cpp $(GUISRC) $(EEPROMSRC) gui/$(GUIDIRECTORY)/lcd.cpp gui/$(GUIDIRECTORY)/splash.cpp keys.cpp maths.cpp translations.cpp gui/$(GUIDIRECTORY)/fonts.cpp $(TTS_SRC)
+CPPSRC += opentx.cpp functions.cpp strhelpers.cpp $(PULSESSRC) switches.cpp curves.cpp mixer.cpp stamp.cpp $(GUISRC) $(EEPROMSRC) 
+
+ifeq ($(GUI), YES)
+  GUISRC += gui/$(GUIDIRECTORY)/lcd.cpp gui/$(GUIDIRECTORY)/splash.cpp gui/$(GUIDIRECTORY)/fonts.cpp 
+endif
+
+GUISRC += keys.cpp maths.cpp translations.cpp $(TTS_SRC)
 
 # Debugging format.
 #     Native formats for AVR-GCC's -g are dwarf-2 [default] or stabs.
diff --git a/radio/src/eeprom_rlc.cpp b/radio/src/eeprom_rlc.cpp
index eb9203fb5..9b21094bc 100644
--- a/radio/src/eeprom_rlc.cpp
+++ b/radio/src/eeprom_rlc.cpp
@@ -975,9 +975,11 @@ void eeLoadModel(uint8_t id)
     logicalSwitchesReset();
 
     if (pulsesStarted()) {
+#if defined(GUI)
       if (!newModel) {
         checkAll();
       }
+#endif
       resumePulses();
     }
 
diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index 95a4b91a8..079dc9c77 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -1011,6 +1011,7 @@ void doSplash()
 #define doSplash()
 #endif
 
+#if defined(GUI)
 void checkAll()
 {
 #if !defined(PCBSKY9X)
@@ -1049,6 +1050,7 @@ void checkAll()
 
   START_SILENCE_PERIOD();
 }
+#endif // GUI
 
 #if defined(MODULE_ALWAYS_SEND_PULSES)
 void checkStartupWarnings()
@@ -1154,6 +1156,7 @@ void alert(const pm_char * t, const pm_char *s MESSAGE_SOUND_ARG)
   }
 }
 
+#if defined(GUI)
 void message(const pm_char *title, const pm_char *t, const char *last MESSAGE_SOUND_ARG)
 {
   lcd_clear();
@@ -1206,6 +1209,7 @@ void message(const pm_char *title, const pm_char *t, const char *last MESSAGE_SO
   lcdSetContrast();
   clearKeyEvents();
 }
+#endif
 
 #if defined(GVARS)
 int8_t trimGvar[NUM_STICKS] = { -1, -1, -1, -1 };
@@ -1971,8 +1975,10 @@ void opentxStart()
   eeLoadModel(g_eeGeneral.currModel);
 #endif
 
+#if defined(GUI)
   checkAlarm();
   checkAll();
+#endif
 
 #if defined(GUI)
   if (g_eeGeneral.chkSum != evalChkSum()) {
@@ -2628,8 +2634,10 @@ void opentxInit(OPENTX_INIT_ARGS)
     eeDirty(EE_GENERAL);
   }
 #endif
-  
+
+#if defined(GUI)
   lcdSetContrast();
+#endif
   backlightOn();
 
 #if defined(PCBTARANIS)
@@ -2670,7 +2678,7 @@ int main(void)
 
   boardInit();
   
-#if !defined(PCBTARANIS)
+#if defined(GUI) && !defined(PCBTARANIS)
   lcdInit();
 #endif
 
@@ -2683,7 +2691,7 @@ int main(void)
   #endif
 #endif
 
-#if !defined(PCBTARANIS)
+#if defined(GUI) && !defined(PCBTARANIS)
   lcdSetRefVolt(25);
 #endif
 
diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index 868fc29b3..201d638ad 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -649,7 +649,11 @@ void readKeysAndTrims();
 
 uint16_t evalChkSum();
 
-#if defined(VOICE)
+#if !defined(GUI)
+  #define MESSAGE_SOUND_ARG
+  #define MESSAGE(...)
+  #define ALERT(...)
+#elif defined(VOICE)
   #define MESSAGE_SOUND_ARG , uint8_t sound
   #define MESSAGE(title, msg, info, sound) message(title, msg, info, sound)
   #define ALERT(title, msg, sound) alert(title, msg, sound)
diff --git a/radio/src/switches.cpp b/radio/src/switches.cpp
index 339467e20..7981f7f7c 100644
--- a/radio/src/switches.cpp
+++ b/radio/src/switches.cpp
@@ -636,6 +636,7 @@ int8_t getMovedSwitch()
   return result;
 }
 
+#if defined(GUI)
 void checkSwitches()
 {
 #if defined(MODULE_ALWAYS_SEND_PULSES)
@@ -798,6 +799,7 @@ void checkSwitches()
   }
 #endif    
 }
+#endif // GUI
 
 void logicalSwitchesTimerTick()
 {