run NeXTSTEP. Berkeley Software Distribution (BSD) Unix was ported to the HP 9000 as HPBSD; the resulting support code was later added to 4.4BSD. Its modern variants NetBSD and OpenBSD also support various HP 9000 models, both Motorola 68k and PA-RISC based. In the early 1990s, several Unix R&D systems were ported to the PA-RISC platform, including several attempts of OSF/1, various Mach ports and systems that combined parts of Mach with other systems (MkLinux, Mach 4/Lites). The origin of these ports were mostly either internal HP Labs projects or HP products, or academic research, mostly at the University of Utah. One project conducted at HP Laboratories involved replacing core HP-UX functionality, specifically the virtual memory and process management subsystems, with Mach functionality from Mach 2.0 and 2.5. This effectively provided a vehicle to port Mach to the PA-RISC architecture, as opposed to starting with the Berkeley Software Distribution configured to use the Mach kernel infrastructure and porting this to PA-RISC, and thereby delivered a version of HP-UX 2.0 based on Mach, albeit with certain features missing from both Mach and HP-UX. The motivation for the project was to investigate performance issues with Mach related to the cache architecture of PA-RISC along with potential remedies for these issues. See also HP 3000 HPE Integrity Servers HP Superdome HP 9800 series, prior series of scientific computer workstations HP 7935 disc drive Notes External links HP 9000 evolution, HP 9000 evolution to HP Integrity Official HP Mission-Critical Musings Blog HP 9836 at old-computers.com HP Computer Museum hp-series300.net Information resource on HP 9000 Series 300 computers OpenPA.net Information resource on HP PA-RISC-based computers, including HP 9000/700, 800 and later systems Site communautaire sur les stations de travail et serveurs hp9000, regroupant des informations, part number ainsi que de la documentation au format PDF. 9000 9000 Computer workstations Computer-related introductions in 1984 32-bit computers 64-bit computers