Most common calculators in the forum?

[hth]

(12-13-2017 09:33 PM)Massimo Gnerucci Wrote:  Then there's the 71B (Basic) and 75D (?)

B - probably Basic (the language).

D was just the letter after C, which is how HP often numbered variant/updated products (but that rule was not applied to calculators).

Håkan