If you know C, retroforth's nga vm is ~300 lines and quite simple. I found it to be enlightening. https://git.sr.ht/~crc_/retroforth/tree/master/item/doc/Nga.m

If you know C, retroforth's nga vm is ~300 lines and quite simple. I found it to be enlightening. https://git.sr.ht/~crc_/retroforth/tree/master/item/doc/Nga.md https://git.sr.ht/~crc_/retroforth/tree/master/item/doc/Nga.... - this is the "literate" version, there are a few variants of the source in the tree if you look.