diff --git a/HISTORY.md b/HISTORY.md
index 4660c41..2ea9980 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -13,4 +13,5 @@
 - 2019-12-22 v1.2.4 libinfo can be excluded to save memory, optional use of flash for character definition (newCHR), delay function outsourced (delay.S)
 - 2019-12-26 v1.2.5 parameter area revised
 - 2020-01-14 v1.2.6 delay routines as include, more precise timing
+- 2020-01-18 v1.2.7 minor source code adjustments / LibreOffice Calc-Sheet to calculate the correction factor
 </pre>
diff --git a/include/DelayCalc.ods b/include/DelayCalc.ods
new file mode 100644
index 0000000..3e9d821
Binary files /dev/null and b/include/DelayCalc.ods differ
diff --git a/include/delay.S b/include/delay.asm
similarity index 92%
rename from include/delay.S
rename to include/delay.asm
index 7286160..52731e4 100644
--- a/include/delay.S
+++ b/include/delay.asm
@@ -20,15 +20,13 @@
 .print "v0.1.0 2019-12-21"
 
 ; AVR register
-;.include "/Users/roland/Projects/inc/m8def.inc"
-;.include "/Users/roland/Projects/inc/m328def.inc"
-.include "/Users/roland/Projects/inc/tn13def.inc"
-
-
+;.include "../inc/m8def.inc"
+;.include "../inc/m328def.inc"
+.include "../inc/tn13def.inc"
 
 ;calculate counter for delay loop
 .ifndef __F_CPU                            ; if not set
-    .equ __F_CPU, 6000000                  ; set to 6MHz systemclock
+    .equ __F_CPU, 12000000                  ; set to 12MHz systemclock
 .endif
 
 .equ Cfactor, 2                             ; correction factor
diff --git a/hd44780.h b/include/hd44780.h
similarity index 96%
rename from hd44780.h
rename to include/hd44780.h
index 35d4040..61e491c 100644
--- a/hd44780.h
+++ b/include/hd44780.h
@@ -53,8 +53,6 @@ extern "C" {
     extern void printLCD(const char *text);
     extern char readLCD(char rs);
     extern void newCHR(char addr, const char *character);
-//    extern void mswait(int ms);
-//    extern void uswait(int us);
 
 #ifdef __cplusplus
 }
diff --git a/library.json b/library.json
index ca03451..4a8ed9c 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "LCD-LED-library",
-  "version": "1.2.6",
+  "version": "1.2.7",
   "keywords": "hd44780, ks0066, (max7221), lcd, (led), display",
   "description": "Display library for HD44780 kompatible displays, supports 4/8 bit and 3 wire serial interface",
   "platforms": "atmelavr, atmelmegaavr",
diff --git a/hd44780.S b/src/hd44780.S
similarity index 99%
rename from hd44780.S
rename to src/hd44780.S
index cc89b16..e236ce5 100644
--- a/hd44780.S
+++ b/src/hd44780.S
@@ -23,8 +23,8 @@
 ; you can convert the files from https://github.com/DarkSector/AVR/tree/master/asm/include using atmel2gnu.py
 
 .include "../inc/tn13def.inc"
-.set __F_CPU, 12000000
-.include "/Users/roland/Projects/lib/disp-lib/include/delay.S"
+;.set __F_CPU, 12000000
+#include "delay.asm"
 
 ;.include "/Users/roland/Projects/inc/m8def.inc"
 ;.include "/Users/roland/Projects/inc/m328def.inc"