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From Coherent…

Amix was not the first time Commodore attempted to build a Unix machine. Between 1983 and 1985, Commodore prototyped a Z8000-based machine called the Commodore 900 running Mark Williams' SVR4 UNIX clone 'Coherent' (v0.7.3). It was housed a case very much ressembling the Amiga 2000's. The machine was produced in small numbers as prototypes and developer machines relased in Europe only. Approximately 500 units were produced, with very few remaining working today. The 900 was canceled amid the purchase of Amiga during 1985.

See also: The Forgotten Commodore 900, we look at a rare prototype | Tech Nibbles | RMC - The Cave (YouTube)
And: Commodore 900: The Unix-like workstation/server that was eclipsed by Amiga (

… to Amix

One of the first public demonstrations of Amiga Unix was at the 1988 Uniforum Conference in Dallas, TX. The prototype machine, Amiga 3500, housed in a Commodore PC60-III tower case was demonstrated at the Business Computing Show in 1991 and finally launched as the slightly re-configured Amiga 3000T in october 1991.

Commodore Amiga 3000UX - Born To Run Unix SVR4
WANTED: a higher quality scan of this - please contact us if you can provide one!

The A3000UX was also sold for universities and students. The machines were generally well-received and liked by students and staff. In some universities students were required to buy required hardware and after the end of support for Amix, later on after the demise of Commodore, universities were in serious trouble finding spares to support students who had bought Amigas. In some cases universities were forced to buy machines back from their graduated students! (Thanks to Pentad on forums for this info).

Amix was sold only for a couple of years and it's support was dropped already before Commodore's bankruptcy in 1994. Rumour has it that the last (and at the time only!) Amix support engineer was fired in 1993.

Like several other UNIX packages of the early 1990's, Amix never managed to grab wide user base and partly due to the limited hardware support. Unlike Apple's A/UX, Amix didn't have any compatiblity layer to allow running AmigaOS applications. It also didn't make use of the Amiga's graphic and sound capabilities, the parts of the hardware that made Amiga itself special at the time. Also Amix's only supported CPUs (68020/68030) were underpowered and not competetively priced compared to the competing Unix workstations. Around the same time, there was also Atari System V, which also was an SVR4 port to the Atari TT 030 Workstation. Much like Amix, it had a “brief spark of life around 1991-92 and died shortly after”.

There were talks of Sun Microsystems selling Amiga Unix machines (the prototype Amiga 3500) as a low-end Unix workstations under their brand, making Commodore their OEM manufacturer. This deal was let down by Commodore's Mehdi Ali, not once but twice and finally Sun gave up their interest.


Lead developer of Amix (/Unix SVR4 port and distribution for Amiga computers) was Michael Ditto, having the title of Unix Systems Software Architect at Commodore in 1988-1991.

Unix Technical Support Specialist at CATS was David Miller (mentioned in the Amiga Developer docs).


A Unix Graphics Workstation for the Rest of the World (Ben Smith, Byte Magazine December 1990)

“The Amiga 3000UX greatly outperforms the equivalent NeXT and Mac with A/UX. In raw Unix performance, it is roughly equivalent to a 20MHz 386 system, but it is much more suited to handling the graphics requirements of a graphical user interface like Open Look. At roughly $4000, it is an obvious choice as a low-end workstation.”

More than a Toy but No Bargain (Mike Burgard, UNIX World December 1991)

“Commodore hasn't given us a convincing reason as to why it put UNIX on the Amiga”

Special features of Amiga UNIX

(Excerpt from the “Using Amiga UNIX” manual)

Your Amiga UNIX System is a complete version of AT&T's UNIX System V Release 4.0 (Release 4) and provides all the features of that operating system. However, Amiga UNIX is more than just Release 4; it combines elements from several sources:

  • Amiga high resolution graphics
  • Amiga enhancements, including virtual screens, device drivers, and system-specific hardware functions
  • AT&T UNIX, which includes Berkeley and Xenix commands
  • public domain utilities

What features are unique to Amiga UNIX?

Amiga UNIX enhancements cover four distinct areas:

  • screen management
  • online guided interface to user and administrator tasks
  • public domain utility programs
  • miscellaneous utilities and system calls unique to the Amiga port of the UNIX operating system

Screen management programs define and create virtual screens, allow access to the Amiga console and custom RAM, and control various display elements of Amiga screens, including color, font type, and character size.

We added several public domain programs, and even documented them as primary options, because they are well known and, in some cases, more useful than the comparable Release 4 programs. The Release 4 programs still exist, work properly, and are located in the right place; we have simply added altematives, as shown in the following table.

Table 1: Unix standard → Amiga UNIX alternative
mail elm
more less
finger Finger
vi emacs
cc gcc

Other public domain programs provide functions not included in standard UNIX Release 4. These programs are in the directory /usr/public/bin.

Unique Amiga UNIX functions

Some Amiga UNIX features are unique only because of the Amiga hardware. Functions such as formatting floppy disks and hard disk partitions, connecting a paraller printer, and setting a keyboard translation map exist in some form on many system; the specific variants for Amiga UNIX are documented in this chapter. Again, any unique features are in addition to UNIX Release 4, no AT&T, Berkeley, or XENIX functions have been removed or replaced.

Where are the Amiga UNIX programs?

Amiga programs and utilities that are not available on any other system are in the following directories:

  • /usr/amiga/bin
  • /usr/amiga/etc
  • /usr/amiga/lib/kmap
  • /usr/amiga/lib/font
  • /usr/public/bin
Table 2: Some of the special Amiga UNIX commands
A2024linked to true or flase to allow or disable high resolution
amixadm Amiga Unix System Administration tool
amixpkg system packages installer
color set or show screen color
fdfmt format a floppy disk
getscr define and create a virtual screen
passwdall set/erase all system account passwords
rdb set/show hard disk partitions
sioc set/display keymap, font and screen size

history.txt · Last modified: 2023/09/30 15:28 by wiki_admin