What's an HP28F


I've seen a description of an HP28C and HP28S, but someone has advertised something as an HP28F -- Is there such a beast, or does this person have finger trouble?


Might be typographical error, but EDUCALC made custom HP-28's by adding extra memory (either 4K or 32K) to the standard HP-28C. This was, of course, before the introduction of the 28S. EDUCALC called these the Turbo-28 4K and Turbo-28 32K.

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