It is probably better documented than the SPARC.
The guys at Utah University had a complete port of Mach 3.0 to the
HP-PA done at least three years ago. Their Flux OS most likely still
runs on those machines.
Miguel.
-- miguel@roxanne.nuclecu.unam.mx The GNU Midnight Commander: http://mc.blackdown.org/mc Linux/SPARC project: http://www.geog.ubc.ca/sparclinux.html