Hi, I finally found & forked a good BASIC implementation for Arduino, adapted it for the Teensy's series & followed my quest of an own built computer.... How does it looks like now Remember... I started from here .... (http://xtase.over-blog.com/2017/02/xts-ubasic-starting-mother-board/debuts-de-la-carte-mere.html) Xts-uBasic...