It’s up. But sporadically.
As in the first time I right clicked on your link and opened in a new tab I went right to the page (as you can see in the screen shot of my google browser). When I closed and re-opened I got a 500 internal server error. Repeated openings sometimes got the 500 internal server error and sometimes got the page. Not sure why (something interfering with the redirect).
This is the link I cut and pasted from your original link:
quics.qnx.com/cgi-bin/dir_find.c … /qnx4/gnu/
There definitely are 2 machines there. Pinging quics.qnx.com gives 188.8.131.52 while qnx.com is at 184.108.40.206
I’d try repeatedly (maybe even rebooting to clear some caches) to get there. Once you do, I’d make sure I grabbed everything I could.
P.S. at the bottom of the page it says copyright 1999 and to mail firstname.lastname@example.org if you have any problems. Seems this is awfully old but you might try that email and see if anyone responds.