At about the same time, I had been looking for an application to use as a springboard for diving into learning about Mac OS X application programming. It seems that an RPN calculator is a good application for learning an object-oriented application framework, (a lot of the calculators I downloaded were starter applications) so, a couple of years, and lots of reading and debugging later, LXVII is ready for beta test.
lxviifile type, and are correctly read back in. (Thanks to Richard Hartman for finding it.)
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