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Overview

3.1 Overview

A broad range of operating systems is available for PA-RISC workstations and, to a lesser extent,

servers. They are either Unix or Unix-like, with different designs having both been ported to and

developed speciﬁcally for PA-RISC, including open source, research and commercial products. Most

of the earlier efforts were distributed only to a small, academic circle and not available to the general

public. The current open-source projects are available freely together with sources to the general public.

3.1.1 Commercial products

Few commercial operating systems support PA-RISC computers, with the most prominent Unix systems

being HP-UX and NeXTSTEP. (HP also sells a real-time system for the HP 9000, HP-RT, not discussed

here.)

HP-UX is HP’s own Unix version for PA-RISC computers. All PA-RISC computers from HP are sup-

ported by different versions of HP-UX.

NeXTSTEP is an operating system based on a Mach microkernel with an Unix userland and a slick GUI,

released for PA-RISC in 1994. Support for some 32-bit PA-RISC machines was available in Version 3.3,

with limited hardware support.

3.1.2 Open Source projects

Several open source operating systems support the PA-RISC architecture, including Linux, OpenBSD

and NetBSD. They are all Unix-like.

PA-RISC Linux supports different machines from the newer 32 and 64-bit series though proper support

is still missing for a lot of systems. Linux does not perform equally well as original HP-UX on PA-RISC

systems and hardware support is limited.

OpenBSD/hppa supports most 32-bit systems, and some 64-bit systems in 32-bit mode. Newer ma-

chines running in full 64-bit mode are not supported and later will supposedly be by OpenBSD/hppa64.

NetBSD supports several 32-bit machines, with support for newer machines ported over from OpenBSD.

NetBSD/hp700 is not a major NetBSD effort; it supports some systems and most of the hardware

OpenBSD/hppa supports.

3.1.3 Research projects

Various research operating systems were ported to PA-RISC at different places over the time. All of

these systems were BSD/Unix operating systems based mostly on the Mach microkernel. The ports

were mostly development or research projects, and not operating systems releases in the formal sense.

Many were developed at the University of Utah and later formed the starting point for PA-RISC ports

of other operating systems (OpenBSD, Linux).

These ports include HPBSD, Mach-based Unix/BSD systems, Chorus, OSF/1 ports and MkLinux.

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HP B160L Manual do Utilizador Página 95