The BeSpecific CDs are old, the first has software for DR8 and a few for DR7, and the last disc (Volume 6) for BeOS R4.
Volume 5 is for x86 only.
Try the software on Volume 6, but if you're really curious about earlier stuff, you could install DR8 on your 8500, ah no, the CD on archive.org has been dumped incorrectly.
I can dump mine next week if you're interested.
There's a correct R4.5 though in the archive.