Re: Layout of arithmetic keys on early calculators Message #5 Posted by Didier Lachieze on 19 Nov 2013, 6:15 p.m., in response to message #1 by Walter B
That's an interesting question, I don't know why on the hp-35 and the following hp calculators the order of the arithmetic operators from bottom to top was /,*,+,- while on the previous and first HP calculator, the hp 9100, it was the same as on the SR-50: +, -, *, / (but on the left side).
It seems there was a decision to have a different order between the desktops and the handheld calculators, but I can't imagine any reason behind it. It may also be that both types of calculators were designed by two different groups within hp who didn't care about consistency at that level of detail.
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