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I don't think TI is still selling the 83; they've moved on to promoting the supposedly new and improved N-Spire.

The 83 is still listed on their product website -

http://education.ti.com/educationportal/sites/US/productCate...

http://education.ti.com/educationportal/sites/US/productDeta...

Notice on the page it also says - "Count on TI calculators at exam time. You can use this TI graphing calculator on the PSAT, SAT, and ACT college entrance exams, IB, and AP tests."

The TI-83/84 is still used in a lot of textbooks, and teachers are loathe (sometimes) to learn something new. It's entrenched.

2008-09 list of approved calculators:

http://www.collegeboard.com/student/testing/ap/calculus_ab/c...

It's one of the most common calculators in high schools still

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