This is an HP-41CV simulator for MAC OS X. It is based on the source code written by Greg Ewing. The ultimate goal is to make this calculator available as an iPhone/touch application. Now available in the SVN version an alpha version of HP-41CX
Many thanks to the person who wrote this application! I have used a physical HP 41 calculator for many years, and I still have one which is working. Compared to all the calculators available for different operating systems, this one is simply the best! It works just like my physical HP 41, and on the screen it looks exactly as my physical HP 41. The person Greg Ewing who wrote this application has done a great job!