http://sn.1w6.org/file/mk-20140208T194714-cpx47jq.html
@mcnalu hmm, I wondered about that link,too. I see no mention of RPN! I'm so happy with RealCalc which does RPN (and even, in that mode, vaguely looks like the HP magnetic strip RPN calculators that I did some of my early programming on), that I neever even look any more for a different calculator app.