If you look on some of the *BSD pages NetBSD and FreeBSD you'll see that at least one of them (NetBSD) is being actively ported to PA-RISC.
HP300 was relatively easy, as it used a more "open" CPU, the Motorola 680x0 series. (The "old" processors in the HP800 series is the Moto also.) The new HP700 series (and HP800 that have been upgraded) use PA-RISC, which HP developed in-house, and therefore, keeps wraps on the specs.
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If you look on some of the *BSD pages NetBSD and FreeBSD you'll see that at least one of them (NetBSD) is being actively ported to PA-RISC.
HP300 was relatively easy, as it used a more "open" CPU, the Motorola 680x0 series. (The "old" processors in the HP800 series is the Moto also.) The new HP700 series (and HP800 that have been upgraded) use PA-RISC, which HP developed in-house, and therefore, keeps wraps on the specs.
Cheers,
Ken Crandall