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 ...

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.

The watches' calculator function can add, subtract, multiply, and divide up to eight digits. As for watch functions, you get ...