Help in choosing a new calculator

[Marco Polo]

(10-12-2016 11:20 AM)bhennink Wrote:  I never realized that my old HP27S was such a great device

May I suggest you to try the old stile (like the 48sx) menu solver?
No frills, not attractive but fast and reliable.
If the memory helps me, you can reach it keeping pressed by right shift + 7 and then ROOT
Type your eq and store in EQ var. (Left shift +EQ)
Then SOLVR.
Input known varables by typing and pressing the relevant menu label.
Solve for unknown by pressing left shift + relevant label.

If anything goes wrong, the manual helps :-)