not to be mean or anything but the 73 looks kinda like the 8088 of calculators...looks even worse then the ti80/81s. i mean...3rd party support for calcs? isnt that a little too much? why didnt ti just put all the stuff into the calc that the lowerend of math needed and take out the keys and loops (not good for much by how it sounds on the page) and load it with programs for shipping instead of having to buy it