Several research and development operating systems have been ported to PA-RISC between the late 1980s and late 1990s, many of them Mach microkernel-based.| www.openpa.net
OpenBSD is an Unix-like open source operating system for PA-RISC and supports 32-bit HP 9000 workstations and some 64-bit computers.| www.openpa.net
HP-RT was a real-time operating system for HP PA-RISC VME boards.| www.openpa.net
Computerworld 1993-12-13: Volume 27, Issue 50.Digitized from IA1519207-02.Previous issue: sim_computerworld_1993-12-06_27_49.Next issue:...| Internet Archive
Juicy Itanium trial document firehose opened| www.theregister.com
HP-UX is HP’s commercial Unix operating system for PA-RISC computers, version 11i from the 2000s runs on most PA-RISC and Itanium computers from HP.| www.openpa.net
Many Unix and similar operating systems were available for PA-RISC from the 1980s on, first HP-UX, followed by many Mach and BSD research projects.| www.openpa.net
Most PA-RISC operating systems were commercial Unix, Unix-like derivates or open source projects, with different designs ported and developed for PA-RISC.| www.openpa.net