Thanks for this monumental effort ! I ran the "blink" program and another a string functions testing program and they ran perfectly . I attached a few 'small devices" as well like LEDs and a terminal , was impressed with its functioning. The compiler within it is very friendly and its messages are detailed to solve any coding mistake easily, even compared to the Arduino IDE C compiler. My congratulations. Is there a way to run a HEX file directly in case i don't have C source program ? its needed in some situations where i compile on a different compiler and want to test the hex file on your simulator or someone gives me a hex file to use.