AriCalculator is a home made pocket calculator.

[Alejandro Paz(Germany)]

Regarding programming everything in assembly... I used to do that (I started to think about building my own calculator at the end of the 90s), I started with the 68HC11 (a subset of what you have), H8/300H (I had math routines, GUI and plots working), SH-1, AVR. I stopped there and went to C. I can test on the PC and have HAL code for the different microcontrollers I use nowadays: Cortex-M3, M4 and PIC32 (MIPS), and x86. Even a PIC32 at 16 MHz has enough speed that assembly is not required.

I think that MPLABX lets you simulate (for the PIC32), many people does not like it, I used to use netbeans so it is a familiar environment for me.