I have been an enthusiastic user of RPN calculators since high school, when Gerry Ford was president. Of course I refer to those made by Hewlett-Packard. My first was the HP-25C. The beauty of the RPN system with its 4 register stack was that it could do fairly elaborate chain calculations without the need for parentheses or an equal key. It is quite intuitive to many of us and was a pleasure to use.

But, alas! The HP RPN calculator has largely gone out of fashion it seems. Only a few models remain on the market and several are financial calculators. The HP-12C financial calculator is a wholly inadequate substitute for a scientific calculator. My 12C now sits in the desk drawer with unused pens and paper clips. All seems lost for the RPN tribe.

Or so I thought. It turns out that there is a manufacturer of Hewlett-Packard RPN clones called SwissMicros. These folks have taken the RPN baton and are running with it. Hero’s, I call them. They knew a good product when they saw it and have saved the day by manufacturing a clone that seems nearly indistinguishable from the corresponding HP unit.

I recently purchased the HP-15C clone called the DM15L. It has the look and heft of the 15C. My use thus far has been cursory, but I look forward to exploring the features. So, here is a shout out to SwissMicros!