diff --git a/avr/devices/all/hw_tn841.asm b/avr/devices/all/hw_tn841.asm
index 8ca90c3..1804319 100644
--- a/avr/devices/all/hw_tn841.asm
+++ b/avr/devices/all/hw_tn841.asm
@@ -110,11 +110,7 @@ systemSetupTimer0:                            ; setup timer for IRQ every 100ms
   ldi r16, 78-1
   out OCR0A, r16
 
-#ifdef BASETIMER_T841_FAST
-  ldi r16, 1
-#else
   ldi r16, 10
-#endif
   sts baseTimerModuleReloadValue, r16
   sts baseTimerModuleTickCounter, r16
 .endif
diff --git a/avr/devices/t03/main/main.asm b/avr/devices/t03/main/main.asm
index 8947efb..a37e92f 100644
--- a/avr/devices/t03/main/main.asm
+++ b/avr/devices/t03/main/main.asm
@@ -53,8 +53,6 @@
 
 
 #define MAIN_WITHOUT_MSG_HANDLING ; we do message handling ourselfes
-#define BASETIMER_PRIVATE_TICK_FN ; we use our own system tick function
-#define BASETIMER_T841_FAST       ; call our tick every 10ms
 
 #define MODULES_CLOCK
 ;#define MODULES_COM
@@ -92,17 +90,6 @@
 .equ VALUE_ID_LEDSIMPLE_TIMING = 0x88
 
 
-
-; ***************************************************************************
-; data segment
-
-.dseg
-
-t03TickCounter: .byte 1
-
-
-
-
 ; ***************************************************************************
 ; code segment
 
@@ -161,9 +148,6 @@ firmwareVersion:     .db FIRMWARE_VARIANT_TEMP_WINDOW, FIRMWARE_VERSION_MAJOR
 ; @routine firmwareStart @global
 
 firmwareStart:
-  cli
-  clr r16
-  sts t03TickCounter, r16
   rjmp main
 ; @end
 
@@ -179,22 +163,6 @@ onSystemStart:
 
 
 
-privateTimerTick:
-  lds r16, t03TickCounter
-  inc r16
-  cpi r16, 10
-  brcs privateTimerTick_store
-  clr r16
-privateTimerTick_store:
-  sts t03TickCounter, r16
-  cpi r16, 0
-  breq privateTimerTick_runSystemTick
-  ; TODO
-  ret
-privateTimerTick_runSystemTick:
-  rjmp onSystemTimerTick
-
-
 
 
 
diff --git a/avr/modules/basetimer/main.asm b/avr/modules/basetimer/main.asm
index 55e46db..077defc 100644
--- a/avr/modules/basetimer/main.asm
+++ b/avr/modules/basetimer/main.asm
@@ -92,11 +92,7 @@ BaseTimer_Run:
 BaseTimer_Run_loop:                       ; for every timer tick
     push r24
       push r25
-.ifdef BASETIMER_PRIVATE_TICK_FN
-        rcall privateTimerTick
-.else
         rcall onSystemTimerTick
-.endif
       pop r25
     pop r24
     sbiw r25:r24, 1