OpenBSD/mac68k runs on many of the Motorola 680x0-based Apple Macintosh
It requires a Motorola 68020, 68030, or a 68040 processor. If you have a
68020, it will also need a Motorola 68851 PMMU (note that this is
different from the 68881, which is an FPU).
A mailing list dedicated to the OpenBSD/mac68k port is available at
To join the OpenBSD/mac68k mailing list, send a message body of "subscribe
mac68k" to email@example.com.
Please be sure to check our mailing list policy before
There is currently no maintainer for the mac68k port, although
others are definitely welcome to contribute!
Table of contents
The mac68k port of OpenBSD was derived from NetBSD/mac68k, and it
used to support most of the same hardware as NetBSD.
Active building and testing of OpenBSD/mac68k was discontinued after
OpenBSD 4.6 due to lack of interest with developers and builder.
All hardware listed in the
supported hardware section below should boot
multi-user, and support enough of the on-board devices to be generally
Projects (in no particular order):
- Support more devices.
- Repair X support
OpenBSD/mac68k runs on a large part of the 680x0-based Macintosh
The kernel itself has support for the following processor combinations:
- 68020 with 68851 PMMU and 68881 FPU
- 68030 with 68882 FPU
- 68040 (not including the 68LC040)
The following Macintosh models are supported and tested.
This means that at least the SCSI controller, serial console and on-board
ethernet will function on these models.
On some of these machines, a full 68040 CPU is required to replace the
default 68LC040 CPU.
- Classic family: SE30
- LC family: LC, LC II, LC III, LC III+, LC475, Performa 400-430, Performa 450, Performa 460, Performa 475, Performa 476
- Centris family: 610, 650
- Quadra family: 605, 610, 630, 650, 660AV, 700, 800, 840AV, 900, 950
- Internal SCSI controllers and peripherals:
- Quadra/Centris series' onboard NCR 53c96 SCSI controller
- Macintosh II-series', Performa, and LC-series' onboard NCR 5380 SCSI controller
- SCSI disk drives
- SCSI cdrom drives
- Tape drives
- Internal sound
- NuBus internal expansion bus
- Internal video and most NuBus video cards
- Both internal serial ports
- ADB keyboards and mice
(adb) (except on the IIfx, Quadra 900 and 950).
- Ethernet cards based on the Natl. Semiconductor 8390 (Asante, Apple, and a few others)
- Quadra/Centris AV series' onboard MACE ethernet
- Some ethernet cards based on the SONIC chip including internal Ethernet on many of Apple's non-AV Quadras/Centrises
The following Macintosh models are untested and/or lack support for major
subsystems. It is very likely that many of these system don't work at all.
- Classic family: Color Classic, Classic II
- Macintosh II family: Mac II, IIx, IIcx, IIci, IIsi, IIfx, IIvi, IIvx, Performa 600
- 500 family: 520, 550, 575, 580, Mac TV
- PowerPC-based Macs. Some of these are supported in the
- Powerbook family. Hardware capabilities limit the usability of these
- Machines based on the 68LC040 processor.
Unfortunately, the chip itself contains a major bug for which there is
no software workaround available in OpenBSD.
- Apple Communication Slot (CS) ethernet cards.
- Any other NuBus card not listed above.
- Floppy drive.
- IOP ADB subsystem on the IIfx, Quadra 900 and 950.
- IDE drives.
Getting and installing OpenBSD/mac68k:
The latest supported OpenBSD/mac68k release is
Here are the
OpenBSD/mac68k 4.6 installation instructions
$OpenBSD: mac68k.html,v 1.86 2010/02/01 13:34:36 nick Exp $