RPN scientific calculator firmware for $13 calculator kit

[revwillie]

I bought two of these kits last year and assembled one so far. The fact that the button labels are just paper is a plus. You can break the two-piece buttons apart and relabel at will. The display is impressive in its brightness but I'm pretty sure I've seen the same display in many point of sale terminals.

I'd absolutely be interested in testing an RPN firmware if there is a clear way to reprogram it.