Wow, they used to be allowed back when I was in high school. It came in super clutch for SAT but much more importantly AP. Our school mandated the original CS CAS and drilled us on how to use it effectively and I got good mileage out of it through high school testing and college.

I lost it at some point and got the version 2 and I would occasionally use it for work. I wish it had USB-C because who has a mini-B cable for charging these days

As someone who also menu-3-1'd their way through the SAT, I'm surprised it was ever allowed. Super useful outside of school but knowing that a good portion of my classmates using Ti-84s were doing the same problems on paper felt rather unfair.

CollegeBoard only seemed to realize recently, the ban on CAS calculators on the SAT, PSAT, and AP exams came last September if I remember correctly, maybe August or October

I vaguely remember they were banned by a proxy that stopped working after the Ti-89 came out: no QWERTY keyboards

Originally that blocked the Ti-92, but then the Ti-89 and Nspire line had numeric keypads + CAS