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It has an interface that users of the HP calculator line will be completely at home with, including these features:
Basic (large key) mode
Key click (haptic feedback)
Front four stack elements displayed
Memories are not sacrificed to make room for program steps
RpnCalc has a sixteen-level stack to hold more data. The front four elements on the stack are visible at all times, making it much easier to keep track of where you are in your calculations.
See http://www.efalk.org/RpnCalc/ for manual
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Version 2.19 Fixed bug when user enters too many digits
Version 2.21 changes the way the app remembers keyboard layout. There should be no visible change, but it will prevent bugs in the future when layouts change.
Version 2.20 died with a "class not found" error. Probably a compilation problem. Users who installed 2.20 should immediately install 2.21