I have both a HP-50g and a TI-89T so let's not get into the debate of which is better... I am basically trying to find the most efficient way to enter a bunch of formulas that I use over and over into either calculator. I would prefer some type of app where I can enter the formulas on a computer very quickly and then transfer them into the calculator. Possibly even some type of way where I can enter a few parameters in one place then use any formula to solve for unknowns. While I have both calc's and can do basic functions on both, I am pretty green at doing more advanced things such as programming, etc. so please try and keep any recommendations to those where there isn't a huge learning curve and I can be entering formulas within a few minutes.... Thanks!