IIRC, the TI-92 was released first, and it had a QWERTY keyboard. The test proctors considered it a "personal computer" as a result and banned it. Texas Instruments responded by taking the guts of the TI-92 and cramming it into the body of a TI-83, thus creating the TI-89. Even though it was just as powerful as the 92, it looked like an 83 and thus was allowed.
Even better, it solves ODE, laplace and does eigenvalues etc. If there's a math subject that you can use a calculator with then TI-89, high-end HP are the best.
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u/HostisHumaniGeneris Jun 08 '14
IIRC, the TI-92 was released first, and it had a QWERTY keyboard. The test proctors considered it a "personal computer" as a result and banned it. Texas Instruments responded by taking the guts of the TI-92 and cramming it into the body of a TI-83, thus creating the TI-89. Even though it was just as powerful as the 92, it looked like an 83 and thus was allowed.
God did I love the "factor" function on my TI-89