
Research PA-RISC Operating Systems HP Tut
Release Notes for MkLinux on HP PA-RISC
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(FTP) Descriptions on MkLinux and extensive
installation instructions. The Open Group (1997 [Central Iowa (Model) Railroad mirror 1999].
Accessed 5 October 2005)
3.7.5 HP Tut
Architecture: HP Mach 2/HP-UX
Released: 1988/89 (development)
Tut was the name of project at HP Labs done at 1988-89 to get HP-UX running on a Mach microkernel.
The project possibly never suceeded very far and switched to merging parts of Mach 2.0 (VM and
tasks/threads?) into/under HP-UX 2.0 to get something close to resembling Mach on PA-RISC (1.0). It
was the basis for various other porting efforts.
3.7.6 HP OSF/1
Architecture: HP Mach 2/OSF/1
Released: 1990 (development), 1991-1992 (product?)
Around 1990 an internal HP project started a port of an early version of the OSF/1 (OSF/1 1.0) operat-
ing system to PA-RISC. OSF/1 was the proposed Unix operating system by an alliance of DEC (Digital),
IBM, HP and others to compete with AT&T’s and Sun’s System V Unix. The HP project was apparently
independent of OSF’s own later effort to port OSF/1 to PA-RISC (MK-PA, which started several years
later).
HP OSF/1 was developed by ex-Apollo staff, after Apollo was bought by HP (at the times there were
also rumours of OSF/1 for 68k-based HP/Apollo systems). They ported the Mach 2.0 ( “macrokernel” )
to the early HP 9000/700 workstations (PA-RISC 1.1 based), resulting in a fairly complete operating
system, with proper hardware support and a usable desktop environment (Motif and other OSF/1 appli-
cations). The port was however never widely distributed and only sold for a short time as a commercial
product, which was withdrawn quickly (probably due to not complete/competitive hardware and soft-
ware support when compared to internal and external competitors). It was however used widely at the
University of Utah.
3.7.7 MK-PA (OSF/1)
Architecture: Mach 3/OSF/1
Released: 1994, 1995, 1996
The OSF RI (Open Group Research Institute) did a port of their OSF/1 Unix to PA-RISC — they ported
OSF/1 1.3 onto Mach 3, with OSF/1 running as a server on top of the Mach microkernel. The results
of the porting efforts were OSF MK6.0-PA (1994), MK6.3-PA (July 1995), MK7-PA (Jan 1996) and
MK7.x-PA (March 1996).
Hardware support focused on the newer PA-RISC 1.1 700s workstations, support for the 800s PA-
RISC 1.0 servers was dropped (from the original Mach 3/UX code base). MK-PA had as its main objec-
tives: “establish the PA-RISC as an OSF RI reference platform, performance parity between HP-UX and
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ftp://ftp.cirr.com/pub/hppa/mklinux/mkpa-rel.html
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