[fophillips]

Never been allowed to use a TI for exams in the UK. I've only ever been allowed to use a Casio.

[cmelbye]

It's incredibly common for TI calculators to be allowed on exams in the United States. Several standardized tests specifically allow only TI calculators, along with a few others. I think GP's comment makes a lot of sense. Most students just aren't going to put the effort into learning how to use another graphing calculator program if they can't even use it in class.

[asselinpaul]

I am currently in Year 13 in London. You are definitely allowed TI in the mathematics exams (A-Levels). TI-89 is one of the only that is banned because of its CAS.

Friends in the French system are allowed the TI 89 though.

[x0054]

Just an hint, you can swap the guts of a TI-89 into the body of a TI-83. Don't ask me how I know :)

[burriko]

Yep, I did Maths A-level in the UK back in the 90s, and a TI graphing calculator was basically a requirement for the exams.

[fophillips]

Interesting, I wasn't allowed to use one in A-Levels or university exams.

[glomph]

I think it depends on the modules/exam boards.

[neil_s]

Yeah, I used a Casio (non-programmable, but does integrations) for my (British) IGCSEs, a TI for the (International/Swiss) IB, and am back to using 'university approved' Casios at Cambridge.

[mbq]

Casio also has some powerful calculators, including my beloved Algebra fx2+ and the ClassPad line which slowly converges to a kind of specialised tablet.