If you want to check out a live instance of the script, here's one that 
seems pretty abandoned (so feel free to test it out I guess!):
http://cgi.members.interq.or.jp/kansai/se884kyt/cc/akarimix/remix/bbs.cgi

The main instance is of course the actual Remix board - still going 
since May 1999! I've never been able to access it because they block 
many IP ranges, but maybe one of you guys will have better luck:
http://www.strangeworld.ne.jp/cgi-bin/remix/bbs.cgi

However, using Google's cache feature you can catch a glimpse of it:
https://webcache.googleusercontent.com/search?q=cache:xFs128H5engJ:www.strangeworld.ne.jp/cgi-bin/remix/bbs.cgi
https://webcache.googleusercontent.com/search?q=cache:AL59ONkzTEMJ:www.strangeworld.ne.jp/cgi-bin/remix/bbs.cgi%3Farea%3Dread