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I forgot to mention that both of the HP41Cs that I looked at have the tall keys found on early models. Still the two calculators look differently.
-- Arne
Posts: 4,027
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Hi Chan Tran, Arne, guys;
I bought my HP41C in 1981 in Brazil, and it already had the final production keys. Anyway, I saw an earlier HP41C with the taller keys (the only one I saw so far) and the keys looked a lot like the ones in the Spices (HP3x series) and were a little bit harder to press. I remember that I entered an HP program of maintenance for calculators, and the mainboard of the original 1981 HP41C was replaced for a newer one, an HP41CV without the RAM IC's, meaning it has the space for the additional RAM while the earlier unit used five RAM IC's to build the whole 64 registers (448 bytes). The orignal case (keyboard included), however, was kept.
Only to add a few info.
Luiz (Brazil)