If you need a reverse Polish notation calculator, you can use xcalc command with -rpn option. And don't forget to set PATH to include /usr/openwin/bin.
OS/2 also has a RPN calculator called RPCALC. You can download it from Hobbes web server under the directory /pub/os2/apps/calc. You will need EMX to run it. You'd better install EMX using WarpIN installer. Or even better, NH48S, a very functional alfa of a Reverse Polish Notation calculator for OS/2. It is very similar to the HP48 made by Hewlett Packard.
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