Breadboard RPN calculator

[grbrum]

I wonder if anyone has ever tried to build a breadboard RPN calculator. https://youtu.be/dkWq9me-BgA

[EugeneNine]

When I was still in school I designed on paper a 4 bit CPU. Since most CPU's work by putting numbers in two registers and then executing a instruction to do something with them and they have a stack its pretty much like RPN. In college I started building it all in LogigWorks but never finished as my Amiga 500 started getting pretty slow as I kept adding more and more logic gates,
I should build it someday.

[Steve Simpkin]

One of the assignments I had in a college course was to write a 6502 assembly language program to create a simple integer calculator using a KIM 1 6502 computer trainer. It only had to add and subtract but I still found it a challenging task at the time. A year or so later, I ended up making a 6502-based talking alarm clock for my senior project.

https://en.m.wikipedia.org/wiki/KIM-1