Something that I just learned about as a result of this story: According to this...

Something that I just learned about as a result of this story: According to this blog post[0], Brian Moriarty himself shared the source for the TRS-80 CoCo version of the official interpreter[1], so that's out there too.

[0]https://retrotinker.blogspot.com/2018/02/z-intepreter-source...

[1]http://www.colorcomputerarchive.com/coco/Programming/Source/...