Good replication

This is a nice app. I went to Ohio State U in the 80s when we had one engineering class where the teacher pretty much guaranteed an A if you bought an HP41 series calc. Many subsequent teachers in the eng college supported the use of RPN as well. I purchased the CX rather than the more popular CV model and it is amazing how used to the calculator I got even though I have had several other HP RPN calcs since. When I found this app it was like riding a bike. Even though there is no tactile feedback from the ipad ( one of the things i liked best about the HP) the sound feedback in the app does a good job of emulating it....its hard to describe. The app creator needs to do a better job of describing the selling point of the add-on packages.....which may make me purchase.

80s OSU Guy about i41CX, v4.9.6