Top three calculators ?

[Raymond Del Tondo]

(05-05-2024 11:27 PM)case2001 Wrote:  I am surprised no one ever mentions the Hp28 series. I enjoy the separate keyboard. There is a nice iOS app rpn28x Calc.

Back then when they were new, I had both, first the 28C, which was a nice technology study due to its limited user RAM of ~1.6K .
Then the 28S, which was way more advanced and *useful* than the 28C.
Actually a graphical demo I made on the 28S, and which I showed to Wilfried Koetz of W&W on the CeBIT fair in 1989,
helped preparing the road as a developer of commercial applications for W&W on the HP 48 for me:-)

On an ergonomic view: If you flip the case halves of a 28C/S, you have two relatively sharply shaped edges in your hand.
Nice idea, but next to the worst ergonomic designs ever made by HP.

The Pioneer Series and so-called stretched Pioneers (aka HP 48)
were much better from an ergonomic point of view.
Except for the awful polarizers of the HP 48S series, of course;-)