This talk covers some of the design decisions that lead to the design of the uxn stack machine.

https://vimeo.com/771406693#t=85m30s

C source code of the VM, 100 lines.

https://git.sr.ht/~rabbits/uxn/tree/main/item/src/uxn.c

An example assembly file for that stack machine

https://git.sr.ht/~rabbits/uxn/tree/main/item/projects/examp...

Another stack machine designed to target FPGA with an elegant design, mentioned in the talk above.

https://excamera.com/sphinx/article-j1a-swapforth.html

This might have what you need… https://wiki.xxiivv.com/site/uxn.html interesting design and fun little project.

What about the JVM? :D

https://docs.oracle.com/javase/specs/jvms/se7/html/index.htm...

The virtual machine in nand2tetris (book is *The Elements of Computing Systems) is stack-based.

https://www.nand2tetris.org/

https://mitpress.mit.edu/9780262539807/the-elements-of-compu...

https://www.coursera.org/learn/build-a-computer

Chapter 3 of this book is pretty useful for that, as each of the instructions have pseudo code descriptions. Worth noting they only pop once for the ADD instruction, not twice!

Look at the Green Arrays F18, the "conclusion" that Forth reached:

https://www.greenarraychips.com/home/documents/greg/PB003-11...

Here's a clear description of what each instruction does:

https://colorforth.github.io/forth.html

Hilariously, the system has no logical OR, only AND and XOR and NOT, because "Inclusive-or is rarely needed."

This system was designed by Chuck Moore, father of Forth. Here is an entertaining video of him explaining the F18A stack machine and programming system:

https://youtu.be/0PclgBd6_Zs

This is such a simple machine. I am planning to make a tiny emulator for my site. One could probably write an emulator in 80 lines of Go (one goroutine for each of the 144 cores).