I did a little hunting myself for it, but it is made difficult by the
name being a common one and the source server being an obscure one.
That said: you can find the project pages (but not the source) on the
Wayback Machine:
https://web.archive.org/web/19990221204637/http://spock.ece.drexel.edu/marx/
Then searching the author's name plus Drexel you can find a linkedin
profile for Xiaoxun Zhu:
https://www.linkedin.com/in/xiaoxunzhu
You might be able to get a copy asking him. (Or maybe not, he might be
too busy to dig it up.) But people who have worked a long time on
something for fun are prone to appreciating someone else taking an
interest, so I'd say you have a chance.
Elijah
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was hoping name+university would lead to a github account