why are TI graphing calculators still so expensive

[Zaphod]

(04-11-2018 10:18 AM)Manolo Sobrino Wrote:  Actually there is such a system. It's called RPN Interface, by Lars Frederiksen. IIRC it works up to HW2, and you have to apply a patch to HW3 that maybe works in HW4 as well. It's brilliant, IMO its UI is superior to anything else (including HP) for algebraic expressions with RPN.

Interesting , goes off looking for it .....thanks