I always think of this HN post every few years, as an aside, someone really needs to archive that page it links to because I wont be surprised when that site shuts down or deletes old content:

https://news.ycombinator.com/item?id=9699065

https://speakerdeck.com/nineties/creating-a-language-using-o...

This is super cool!

I could imagine writing a very basic forth or lisp compiler in assembler, but even that would be quite the project.