You might also look at Aries PA-RISC emulator (on ia64):
http://www.princeton.edu/~rblee/ELE572Papers/PARISCtoIA64.htm
Thanks for the reference. There is also a HPPA version of QEMU. Unlike
them we emulate the whole system hardware. At this moment it is an
rp24xx system including the ASTRO/ELROY stuff and the NCR SCSI
controller. We will also add a DE500 ethernet. This means that you can
install Linux from an ISO image in the emulator like you normally
install your system from a CD. The goal is to run MPE eventually. Our
emulator runs on PC x64 in Windows (shame on me).
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