Hey guys, new here. I've got a question for you guys. So I bought a TI Nspire CX CAS calc back in high school and wasn't allowed to use it cause it was illegal (Which I wish I fought against, but I didn't really care at the time). Anyways, my parents spent the money wanting me to use this throughout university, and I agreed for obvious reasons; it's an awesome little machine! Now this is my problem. I'm not allowed to use any CAS calculators in my exams, quizzes, tests, etc. So I was wondering if you guys could help me find a way to wither disable all CAS functions, or to installed the non-CAS calc's (CX) OS onto mine so that I can use this one without having to go and shell out the extra monies to buy a TI-84. I don't want to spend the time and money to sell mine, and buy a different calc unless this is an extremely daunting task (which I would find hard to believe since you can install the CAS OS on a CX calc no problem (link to that article).

If you guys could help me out, that would be incredibly appreciated!


Thanks,
Jacques

I don't see how this would resolve the issue, since teachers wouldn't know if you had a way to revert it to the old mode. (Which, by the way, you easily could, using the standard OS-changing method)

Short answer: there's no way to do it permanently, or in any way that enforces the inability to do non-CAS functions given a few minutes.

You mentioned the ability to install a CAS OS on the non-CAS nspire. That method also works just fine in reverse. However, it runs from the calculator's RAM rather than truly installing itself. A simple reboot would get you back into the CAS OS, taking around 15 seconds.

If your primary motive is to save money, you could consider buying a used calculator. You can find used ti-83+ calcs on amazon for around $35.