Calculators you regret buying?

[Maximilian Hohmann]

Hello!

(12-12-2023 02:15 PM)Eddie W. Shore Wrote:  ... TI-57 LCD, and TI-54, as they all have horrible keyboards.

Oh yes, now that you remind me... For professional reasons my main collecting interest are navigation calculators, even more than calculators from HP, because they never made dedicated navigation models. Two very common models in the 1980ies were the Jeppesen AvStar and ProStar, both manufactured by Ti. The Avstar was based on the Ti-30LCD and the ProStar on the Ti-57LCD. I have several in my collection, but all of them are totally unuseable because of their bouncy keyboards. It is merely impossible to even add two three-digit numbers. Using them on board an aeroplane, where the result might really matter, would actually be foolish. Luckily I never bought one back in their day (german aviation authorities did not approve electronic calculators and made us use circular slide rules instead) because that would have resulted in instant regret! Similarly unuseable is the car computer from Ti, the "LogPit".

Regards
Max