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What was the reason that pi was a primary key on the HP-35 and shifted on all other handheld HP calculators?
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Joined: Aug 2013
As far as I see on the pictures of the 37 & 38 models in the main exhibit hall the Rv function was also shifted there, so it was just the 31, 32 & 33 models where Rv was attainable without prefix...
I guess that the huge amount of functions on the 34C (which also brought the necessity of a third prefix key) was the main reason for putting the Rv & R^ function on "prefixed". It's just an assumption...
However, sometimes the need for pressing the g key for access of the Rv function annoys me, too, as it's an important function. On the 15C it was also possible to have Rv as primary function, even though this calculator offered an extended range of functions compared to the 34C with just two prefix keys...
Actually the same situation for the Sigma+ function on the 34C...