Normally I would suggest the Internet Archive:
https://web.archive.org/web/20160608.../scenarist.htm
However, there seems to be some JavaScript in the archived Doom9.org code that immediately triggers a redirect (to some non-existing URL) when the site is loaded from Archive.org mirror.
Probably some kind of "anti-iframe" technique that now backfires
[EDIT] I was able to block this via
NoScript extension, but we have to use a deep-link to "scenarist.htm", as the Doom9.org index page appears broken with JavaScript blocked
[/EDIT]