I`ve got about two years of programming skills but I am still not an expert. One trick is if press "Shift" "On" and "Seven" together and the other one is the Matrix hack you can watch some vids if you just type calculator hack Matrix. I am not so sure about the programming language and the IO ports on the calculator. Just have a look at the calculator under http://fivestarelectronics.com.pk/wp-content/uploads/calculator_fx_85es.jpg.
