Stack Overflow Sensing (or: make your own Red Dot!)

[PANAMATIK]

(04-16-2015 11:08 PM)hansklav Wrote:  Inspired by the proposal of John A. Ball in his book ‘Algorithms for RPN Calculators’, as a proof of concept I implemented a stack overflow sensing (SOS) scheme using Neil Fraser's JavaScript HP-35 simulator.

In the process I made my own ‘Red Dot’ HP-35 calculator ;-)

Have a look here and see for yourself if HP missed a chance to build SOS into its very first pocket calculator (and, incidentally, into all its subsequent classical RPN models).

Hans

P.S.: I discovered a small inaccuracy in the functioning of the π-key of the original HP-35 simulator and corrected it in the HP-35 SOS.

This is interesting. As I understood you made patches of the original HP-35 firmware. Do you think it could be possible to make further changes like adding new functions, making the HP-35 a programmable calculator, or write a compiler for ACT firmware?

Bernhard