HP 9000 System needs CPU and OS

jmpvm wanted some help with this problem: "I recently recieved an HP 9000 D2x00 series system minus CPU/Memory board or a disk. I want to get my introduction to the non-intel world with this machine, but I need to build this thing and get an OS on it. I am in the process of trying to get the CPU/RAM board, (If anyone knows a cheap source for used/refurb CPU/RAM boards let me know) but then I need an OS. There is an ongoing NetBSD port, but it is barely in the booting stages, and the Linux port site is down so I can't get any info there. Does anyone have any experience on this platform? What OSs other than HP-UX can I run?"