The original compiler never surfaced but the bytecode language was reverse-engineered back in the late 80s-early 90s (which gave us Inform). The original ZIL language was a mystery until documentation surfaced in the form of an original Infocom manual.
I'm using ZILF (https://bitbucket.org/jmcgrew/zilf) to compile my own ZIL code into version 3 Z-code story files which run in Frotz (and presumably original Infocom interpreters but I don't have any downloaded).
@luigithirty Oh this is cool. And the language example in your screenshot looks actually pretty simple. That could be a fun project with the kid! 😀
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