I understand the RPN mode is implemented like early HP calculators with x y z t registers. It would be great to match later HP48 series behaviour when the 'infinite stack size' option is set. That is  [enter]  [enter] [+] leaves the stack with 5 and not 6 2 as in current version. Also <- key should delete and drop the stack one level. Example of an HP48 can be found at : http://x48.berlios.de/
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