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There are a number of Windows-based calculator emulators out there which try to look and behave like various HP models. For the last few years I have used Excalibur for Windows. It doesn't try to look like anything else, which for me is fine, and it does everything I ask of an RPN calculator. It is an amazing piece of freeware and the developer is definitely one of the good guys.

Recommended.

I have the hp 41 issued by Warren Furlow which I got off the museum web site and it is really nice

The Windows RPN calculator I've used for years is
called xcalc and is available here: http://www.tordivel.no/xcalc/

It has a very useful miniature mode that uses very
little screen space.

Paul Guertin