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RPN is an EXCELLENT form of working for computers (and calculators too…) that helps you a huge maintaining control of results in the development of your calculations!.
Unfortunately, at the moment, I couldn’t say PHYSIC calculators with the RPN mode, outside the HP brand!.
I ask. Why can’t implement this in Casio (for example), or the, hear present, TI BA II Plus?.
HP 12C is a G R E A T calculator, used by bankmans and informatics (like me…) over decades!!.