RPN calculator on breadboard and logic gates

[teenix]

Excellent choice, strap in for an interesting ride :-)

Check out Rob Weinsteins amazing work with the HP-35.

https://hackaday.com/2022/04/07/remotico...patent-up/
https://www.youtube.com/watch?v=IZKi4_BScqc

Here is another build at home serial 8-bit computer using TTL logic gates. It was designed around 1975. The zip file download includes the original article explaining how it works.

http://teenix.org/educ8.html

cheers

Tony