The HP10bII+ Financial calculator POGO connection

I have downloaded the HP10bII+ firmware using the same cable and the SAM-BA 2.18 software. Yes, it has a POGO connection in the battery bay, also The Calculator Store's cable compatible! It is good that it works perfectly the same way as the HP15c CE, and not like the previous models like the HP20/30b or the HP15c LE.

It would be good to develop a RPN version of this firmware, but this is way beyond my capabilities as programmer.

This calculator has a fantastic function set for a financial calculator, including financial, statistical and scientific functions. It has trigonometrics, hyperbolic and inverse functions. It only lacks LOG and 10^x. Even n! works for non-integer values, giving the same result as the HP15c CE (Γ-Function!). It would be great to develop a RPN version - that would be a competitive new calc!