|  | Brand: Texas Instruments
Department: Office Equipment & Equipment Supplies
List Price: $199.99
Buy Used: $102.99
as of 9/9/2010 02:05 CDT details
You Save: $97.00 (49%)
New (56) Used (44) Refurbished (4) from $102.99
Seller: lobsterind
Rating:  234 reviews
Format: CD
Platforms: Mac, Linux, Mac OS X, Mac OS 9 and below, Windows
Color: BLACK
Media: Electronics
Autographed: No
Memorabilia: No
Number Of Items: 1
Operating System: N/A
Shipping Weight (lbs): 3.5
Dimensions (in): 2.8 x 3.9 x 0.7
MPN: TI-89
Model: TI-89
UPC: 490800100329
EAN: 0033317192038
ASIN: B0001EMLZ2
Publication Date: 1998
Availability: Usually ships in 1-2 business days
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| Customer Reviews:
Showing reviews 26-30 of 234
 Love it, Love it January 30, 2010
Omar A (San Bruno, CA)
1 out of 1 found this review helpful
I started out with a ti-83 in highschool and then moved on to a ti-84. And now finally an 89. I wish I had this in my two previous calculus classes. It's hard to find calculations that this thing can't do. Does Integrals and derivatives with ease. I have been using this for the past 3 weeks now and have not had it freeze up on me once(that happened frequently with the 83 and 84).
Not sure if I like the way all the buttons are placed but yet again I am used to the other models, and the features of this far out way the others.
I think it will take a good couple months to be able to learn half of the things this calculator does. Overall amazing product, I would highly recommend.
 How the mighty have fallen January 14, 2010
Darkhydrastar (Canada)
1 out of 14 found this review helpful
Like many of my pears I was very excited after my purchase of the TI-89 titanium. But as I began to use it I got frustrated because my school clears calculators before every test so I lost all the interesting apps. The most frustrating thing is that one of those apps is the statistics program, which is fundamental to my course. I have had to have many fruitless arguements with administration because this calculator is listed as approved for tests, I checked before I bought it. Now it is a very expensive paperweight. I am left to wonder if the earlier versions (ie: TI-83; TI-84) have a STAT program built in why take it out? Statistics is an important unit in mathematics and I can't use my calculator for it. There does not seem to be a way to save any of the downloadable apps onto the permanant memory and we should have that option!
FYI Texas instruments Time to make a calculator that's worth $200. Have at least 3 colors for graphing, put in a bigger screen or atleast conserve the screen space instead of having tabs in the way and simplify the trig and stat again... I am so dissapointed.
 They never last.... January 12, 2010
D. Rush (Austin, TX)
2 out of 2 found this review helpful
I've gone out, and bought, this calculator three different times. Each time, I've been rewarded with a calculator that does everything I need it too - namely, it has a decent enough computer algebra system (CAS) with some ability to perform more limited calculus operations, can store notes (which can be typed on a computer), and is very easy to use. I'm an electrical engineering student - so it's basically been a lifeline to doing things that are extremely time-consuming by hand: basic calculus, linear algebra/matrix operations, polar/phasor notation, etc.
Where this calculator falls apart (no pun intended), is reliability:
TI-89 #1 - works well. In full disclosure, I bought this one used. Makes the SAT math section easier, by far. Apparently I gave it an evil look or something though, as the LCD cracks while I'm using it. and I pretty much use a calculator the same as anybody - I sit it on a desk, and I just press buttons with a light level of pressure. The calculator was always stored in its case, which in turn I stored in my backpack. The backpack was never thrown around, just used normally. Apparently, any LCD problem is automatically the customer's fault according to TI. There really great response to this problem was to offer me a discount in their online store - where the calculator still was more expensive then say...Amazon. As I said it was used when I got it, but the person I bought it from had only had it a few months.
TI-89 #2 - works great, like the first. I had no issue buying it, as in mind there was some possibility that my friend had misused it before I came to own it (even though it functioned for almost year after I bought it). TI had done some upgrade since the first, and I now had the icon interface. This calculator just started randomly freezing every 1-2 minutes. When it would freeze, nothing worked. You couldn't even turn it off. You would have to cycle the batteries. Eventually it just stopped working all together. It was outside of TI's warranty period, which you'll note is only 1 year.
TI-89 Titanium - I was a little annoyed with TI at this point, but I had just entered engineering school and I pretty much HAD to have a decent calculator. I bought it for $140 at the time. It seemed to be really nice - it felt more solid then the TI-89, had enough memory to actually be useful without archiving everything, and it was notably faster. It actually lasted a little while too. I bought the extended warranty to add two additional years to the original warranty. Guess what happens in year 4 though? Like the second one, it just stops working except that it didn't do the freezing thing like the 2nd one did. At this point, since I'm an electrical engineer, I take it apart to investigate. Unfortunately, the LCD seems fine and there isn't really anything I can do. My first inclination was to buy a 4th used one that had a damaged LCD, but I decided to just sell the damaged calculator for a fraction of what I paid.
As I said, these are really great calculators functionally, but TI seems to crank them out with crappy parts that seem prone to fail over time. Their support, will absolutely always argue that LCD failure is the customer's fault and will refuse to do anything. Unfortunately, this calculator really only has one competitor. If you're in grade school, you're probably forced to use TI products. If not, the HPs are still too complicated for most people to want to learn and use. My suggestion, since you're probably going to be forced to buy this, is A) get the extended warranty. Amazon offers the SquareTrade one, and they are really decent to work with. If you buy it in store, you can still usually get the SquareTrade one, and I recommend that. B) be extremely careful. That LCD will break with little provocation. C) take up some religion and do whatever you have to do in said religion to ask the guy in charge to spare your calculator. Also about the extended warranty thing - most Amex cards, along with a few MC, Visa, and Discover credit cards (usually not debit) will double the original warranty to two years for free - so call your credit card company.
TI-89 January 8, 2010
CivilEng (Texas)
0 out of 3 found this review helpful
Great mailing arrived in a matter of days-fast mailing. Works great so far and was brand new as described.
La mejor TI January 7, 2010
Eric Padilla (cps19573)
0 out of 2 found this review helpful
Es una de las mejores TI, tenia una HP antes de esta y se me cayo, desde ese dia dejo de funcionar, la TI ya se me ha caido par de veces y funciona de lo mejor, el unico problema que le encuentro con respecto a la HP es la memoria, ya que cuando se llena la TI se friza, mientras que la HP tiene una memoria SD y no se friza.
Showing reviews 26-30 of 234
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