I recently acquired an RDI precisionbook and would know if anyone has ever installed NeXTstep or Openstep on one.
It appears to have a standard PA-Risc processor and an HP graphics card built it.
The OS on it (HP-UX 10.2) is hosed, so I thought it would be interesting to try.
Replying to my own post.......
The boot loader will start, but hangs immediately saying system is not supported.
Oh well.