RPN scientific calculator firmware for $13 calculator kit

[jklsadf]

Stack lift has been one of the hardest things to get right. I've basically just had to study/copy appendix B of the hp15c user manual, but even that manual is complete for how RCL/lastX should be handled...it's not something that you think about much until you have to implement it. I have had bugs in the past, and would not be surprised if there were stack-lift bugs still.

In some ways, having a two line display can be a mixed blessing seeing more of the stack. It seems to make more sense intuitively when you can only see one line, at least for me. I initially tried your example and also thought it was a bug until I sat down and went through the logic to try to find the bug.

I've just uploaded a new binary of v1.06 with STO/RCL/LASTx.

Thanks for putting together the template, I do like the blue shift color. Meant to print a color copy at work today, but then forgot that my job blocks Dropbox access.