A harking for the past?

Yes, I routinely use my nixie-based Compucorp Scientist 122E desktop. It is keypress programmable similar to the early HP and TI calculators: I also use several calculators because of their unique display or shape. The Castell Novo-Biplex monster, considered the ultimate in linear rules, is hand-powered, unlike the Casio CM-100 solar computer math calc which has been my companion mostly for hex…