OpenBSD/pmax used to run on a large set of the Digital MIPS-based DECstation and
DECserver family. These machines were the counterpart of the VAX-based VAXstations,
until the Alpha line was ready.
The OpenBSD/pmax port was discontinued after the 2.7 release.
The pmax port of OpenBSD was started by Thomas Graichen shortly before the
OpenBSD 2.0 release, based on the NetBSD/pmax sources. It was then slowly
brought in shape, becoming self-hosted, and moving to ECOFF, then ELF
A few releases later, Thomas Graichen stopped working on this port, and
nobody stepped in. The port was slowly left in oblivion, with no new code and
hardly any bugfixes, although releases were still being made.
A timid effort was made after the 2.7 release to revive the port, but
MIPS-specific toolchain problems prevented the system from building itself for a
long time, and development went on hiatus again. When the problem was finally
fixed, it was decided however to stop supporting it and remove the code from the
- DECstation 2100 (PMIN) and 3100 (PMAX)
- DECstation 5000/120, 5000/125 and 5000/133 (3MIN)
- DECstation 5000/200 (3MAX)
- DECstation 5000/240 (3MAXPLUS)
- Personal DECstation 5000/20, 5000/25, 5000/33 and 5000/50
- Frame buffers
XFree86 works on all supported frame buffers.
- On-board PM monochrome (1024x864x1) or 8-bit color (1024x864x8) on PMIN
- On-board PMAG-DV (1024x864x8) on Personal DECstation
- TURBOchannel PMAG-AA (mfb) (1280x1024x1)
- TURBOchannel PMAG-BA (cfb) (1024x864x8)
- TURBOchannel PMAGB-BA (sfb) (1280x1024x8)
- On-board Lance ethernet
- TURBOchannel PMAD-AA or PMAD-AB Lance ethernet
- SCSI Controllers
- On-board SCSI Controller (sii) on PMIN and PMAX
- On-board SCSI Controller (asc) on other models
- TURBOchannel PMAZ-AB SCSI Controller (asc)
- Miscellaneous devices
- DEC LK-201 or compatible keyboard
- DEC VSXXX or compatible mouse
- On-board serial ports on most models
Getting and installing OpenBSD/pmax:
The last supported OpenBSD/pmax release was
It is not available on ftp sites anymore, but releases up to 2.3 were
available on CD.