<p>I happen to have two. One is a Ti-83 Plus Silver Edition, which I’ve had for about four or five years now. It is still in pretty good shape, and I finally found the connectivity cables I lost a few years ago. Only a couple of programs on it, one to identify, and one to factor, both of which I wrong. Beyond that, the only programs ever there were temporary ones used to store annoying AP Stats equations to serve as quick reference when doing homework. I want to start putting it to better use.</p>
<p>The second calculator I have is one I just bought. It is a Ti-89 Titanium Edition, which was purchased in the last week. The price was nice, at $117 plus tax, as I got a $33 in-store credit for returning a Ti-BA II Plus I got as a gift. [I would’ve liked to keep it as well, since it would be useful for economics or financial analytics classes, but I can always snag one later in the year, perhaps from the school bookstore, using the money on my account. With any luck, I can get the Ti-BA II Professional Edition instead, which adds functions like: Net Future Value, Modified Internal Rate of Return, Modified Duration, Payback, and Discount Payback. Amazon has a pretty good price on it too.] The 89 is much more advanced, and should do nicely for the Calc and Calc-based Stats classes I need for my major, but foolishly opted not to take in high school. I’ve read up on it a bit, and the calculator has alot of potential. I want to better learn the programing language it reads, so as to get maximum functionality out of it. And I definitely plan to start putting some programs on both this and the 83.</p>
<p>Those are the only two calculators I have. But, I will be running a few very high-end math programs on my computer this fall, including Mathematica, MathType, Matlab, and MINITAB. I’ll be especially interested to push their limits, and see how I can try and get them to play with other programs like Snap Survey and Stella.</p>
<p>you should have waited and bought the new TI N-spire calculator. Its pretty much the same price as the TI-89 you paid for and maybe even cheaper if purchased through the right online retailer.</p>
<p>Are you allowed to use the Ti-89 in your calc class?
The college I will be attending does not even allow graphing calculators… in any math or math-related class!</p>
<p>I use Mathematica and my TI-89T extensively although that’s slowly going to change during college where they are both prohibited for use on class assignments, tests, exams, and the like.</p>
<p>TI-89, regular edition. I got it in spring of 7th grade; I’m now entering junior year of college and somehow it’s still just about top-of-the-line. With the math classes I’m in now, though, I never use it.</p>
<p>the ti black colored one I hate it. They are so hard to use and the games always disappear. During the last months of school I used a cheap Safeway generic. they always got stolen, i only brought it to school for tests and finals. they can hold notes :)</p>
<p>Friends’ sister’s old 83+ with the middle row of pixels missing. Used to have my own 83+ and 89, but I think I lost one, and one got stolen. I used to only know how to program in TI-Basic, so I’d write math programs for the 89, and then use the OS update from TI’s website as a ROM image for a TI-89 emulator, and let it run at full speed on my desktop =].</p>
<p>Some of the stuff I made on my emulated 89 back in the day (<a href=“http://www11.■■■■■■■■■.com/dilksy/calc.jpg)%5B/url%5D”>http://www11.■■■■■■■■■.com/dilksy/calc.jpg)</a>. I used to generate the sierpinski triangle on my 83, and then I’d re-generate it for ten frames slowly changing the window so it focused on the upper triangle. Then I had a program display them in a loop so it looked like you were zooming in forever. Great way to pass time in class.</p>
<p>I own a TI89, and previously was a TI83 user. The TI89 is a far superior calculator, it saved me more than once with math.</p>
<p>There was one calc lecturer at my college that allowed the use of graphing calculators on the exams (I had him for 2 of my 6 math courses). His logic was that it only told the answer, it didn’t explain how to get to the answer… and so he made you show ALL the steps & name the rules you were using (like the power rule for derivatives). So, with the 89 I was able to double check my final answers & find out where I screwed up. But if I didn’t know what I was doing, the calculator couldn’t save me.</p>
<p>All my physics & chem classes allowed calculators for exams, no restrictions.</p>
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