However, the HP Prime isn’t just your 1980s vintage calculator. It also has an amazing number of applications including a complete symbolic math system based on xCAS/Giac. It is also ...

or MATH 2000 (brief calculus). The TI-83 (not Plus), TI-86, TI-92 and the TI-92 Plus are no longer manufactured. Certainly these older calculators may still be used in courses allowing any calculator.

He also described a binary calculator using marbles. From De progressione Dyadica: This [binary] calculus could be implemented by a machine (without wheels)… provided with holes in such a way ...