Amiga UNIX
Amiga Unix installation disks and tape
DeveloperCommodore-Amiga, Inc.
OS familyUnix (SVR4)
Working stateHistoric
Source modelprimarily closed source
Initial release1990; 34 years ago (1990)[1]
Latest release2.1[2] / 1992
PlatformsMotorola 68030
Kernel typeMonolithic

Amiga Unix (informally known as Amix) is a discontinued full port of AT&T Unix System V Release 4 operating system developed by Commodore-Amiga, Inc. in 1990 for the Amiga computer family as an alternative to AmigaOS, which shipped by default.


Bundled with the Amiga 2500UX and Amiga 3000UX, Commodore's Unix was one of the first ports of SVR4 to the 68k architecture, and this level of compliance was emphasised in marketing materials such as the company's "Born To Run UNIX SVR4" brochure.[3] The Amiga 3000UX provided the OPEN LOOK graphical environment,[1] with the machine reportedly featuring on the Sun Microsystems and Unix International stands at the 1991 Uniforum show, ostensibly as a consequence of Commodore's adoption of these exhibitors' technologies.[4] An earlier Amiga-based graphical Unix system had reportedly featured on the AT&T booth at the Uniforum Fall '89 show.[5]

The Amiga 2500UX had originally been described from COMDEX Fall 1988 show coverage as a 14.3 MHz Motorola 68020-based system with 80 MB hard drive and 150 MB tape system, fitted with 5 MB of RAM and featuring the Motorola 68851 memory management unit and Motorola 68881 floating-point unit (FPU). The "full implementation" of Unix System V was to be offered with the machine.[6] A premature report had emerged of a version of Unix running on the Amiga 2000 at a separate October 1988 event,[7] due to an X Window System implementation for AmigaDOS having been mistaken for a graphical Unix system.[8] As of early 1989, Amiga Unix or AMIX was a System V Release 3.1 implementation on the Amiga 2500UX, reported as featuring a "proprietary windowing system" that was "specifically designed for speed and convenience". Developers had already reportedly received beta versions of the AMIX system, and system pricing was estimated at around $5,000.[9]

Commodore also announced the Amiga 2500UX with the same 68020-based specifications at the CeBIT show in early 1989.[10] As the release of the Amiga 3000UX approached, the hardware requirements for Amiga 2000 systems running Unix were refined further, demanding an accelerator card providing a 68030 CPU and 68882 FPU, such as the A2630, more than 100 MB of hard drive storage, and a tape drive for installing the operating system. Thus, the Amiga 2500UX itself was based on the A2500/30 variant of the Amiga 2500.[11]


Although the Amiga 3000UX could deliver a "responsive" experience, performance in the graphical environment was nevertheless described as being "on par with a slow 386 machine running SCO Open Desktop".[12] Another evaluation of version 1.1 of the operating system described the X Window System performance as being "monochrome and slow as molasses", with an improved version 2.0 of the system to be made available, providing colour support in conjunction with the A2410 graphics board.[13] This board was launched later in 1991, offering a 1024 x 1024 resolution with 8-bit colour depth,[14] having been first announced in late 1988 as a collaboration with the University of Lowell.[6] The card, based on the TMS34010, had previously been demonstrated at the Uniforum Fall '89 show.[5]

The Amiga 3000UX's base price of US$4,998 (approximately US$11,200 today),[15] rising to a reported $7,713 with graphics board (priced separately at around $1,000[16]) and colour monitor,[12] was not especially attractive compared to other Unix workstations at the time. By the end of 1989, around a year before availability of the Amiga 3000UX, vendors such as Hewlett-Packard and Sun had already launched 68030-based models aimed at the low-end of the market. HP had started 1989 by launching its low-cost HP 9000 Model 340 workstation range with prices starting from $5,495.[17] Later in the year, the Apollo DN2500, positioned as an entry-level workstation with monochrome display by HP's Apollo division, cost only $3,990 for a diskless model or $5,490 with hard disk, eliminating the distinction between workstations and personal computers in pricing terms.[18] The Sun 3/80 cost $5,990 for a comparable entry-level product.[19]

RISC-based competitors offering superior performance were also already available at similar price levels as competition increased, such as the DECstation 2100 (reduced to $5,950), and numerous SPARC workstations were anticipated at this $5,000 price point during 1990.[20] Sun's SPARCstation 1, introduced alongside the 3/80,[21] had cost $8,995 for the diskless version in 1989.[19] By the end of 1991, models such as the Sun SPARCstation IPC would cost $6,695 for a model similarly specified to the A3000UX in terms of memory, disk capacity and display, yet offer considerably better performance.[12]

Commodore's product marketing manager indicated that the machine was intended to compete with machines from NeXT and Apple's A/UX, conceding, "We really don't see ourselves as being competitive with Sun."[22] Advertising for the system focused on Apple and NeXT as competitors, emphasising its adoption of System V, OPEN LOOK and X Window System technologies.[23] However, within a year of its launch, the Amiga 3000UX's 68030 was already considered "one whole generation behind" the 68040-based NeXTstation,[12] priced from $4,995 with greyscale display, $7,995 with colour display.[24] Later entry-level workstations from established vendors upheld their aggressive pricing while increasing the performance gap. For example, the Personal DECstation 5000 Model 20 provided a newer CPU and was priced from only $3,995 for a diskless configuration, with the faster Model 25 being available in a colour display configuration with hard disk for $8,495.[25]

Differences in the nature of Commodore's channels between the US and European markets also prevented Commodore from exploiting opportunities to sell Amiga Unix systems. Attempts had been made to target "untapped professional markets" and position the Amiga as a more serious multimedia-capable machine, also satisfying the "corporate checklist" by offering Unix and networking capabilities.[26] In the US market, specialist dealers played an important role in the sales effort and were considered more able to support sophisticated products based on Unix. However, European sales of the Amiga range were largely driven by high street retailers targeting a computer gaming demographic, and a shift in emphasis requiring the introduction of a capable sales and support infrastructure was perceived as being more costly than the potential earnings generated through Unix product sales. Moreover, an increasingly competitive European Unix market led to doubts that such sales would materialise, putting the European availability of Amiga Unix into question.[27]

In an attempt to respond to the competitive situation, Commodore released version 2.1 of Amiga Unix in early 1992, reducing the price of an Amiga 3000UX system bundle featuring 9 MB of RAM, 200 MB hard drive, A2410 high-resolution graphics card, Ethernet card, and colour monitor (or SCSI tape drive) for a limited period to $4,998, compared to a combined retail price of $8,495.[2] By this time, HP had already introduced 68040-based workstations at the low end of the market, such as the HP Apollo 9000 Model 425e, available from $5,490 for an 8 MB, diskless model with 19-inch greyscale monitor.[28] In early 1992, it was reported that Commodore had appointed solution provider Applied Systems Group as the sole UK reseller of Amiga Unix. Commodore maintained claims of the platform outperforming "traditional vendors in its price bracket", also claiming to have converted numerous existing users of "Sun 4, 486 and 68000-based workstations" to the platform.[29]

Unlike Apple's A/UX compatibility layer for System 7 applications, Amiga Unix contains no compatibility layer for AmigaOS applications. Prior to the system's release, Commodore had merely indicated that the company had been "discussing" such application support.[5] Commodore's UK marketing manager stated that user interface guidelines would be introduced to ensure consistency between traditional Amiga and Amiga Unix applications, with Amiga Unix offering a "friendly Mac-like environment".[30] With few native applications available to take advantage of the Amiga's significant multimedia capabilities, it failed to find a niche in the competitive Unix workstation market of the early 1990s beyond certain targeted deployments. For instance, computer science students at Virginia Tech were obliged to purchase the Amiga 3000UX to pursue their studies,[31] with students offered a base model providing 4 MB of RAM, a 100 MB hard disk, and colour monitor for around $4,000.[32]

Unlike typical commercial Unix distributions of the time, Amiga Unix included the source code to the vendor-specific enhancements and platform-dependent device drivers (essentially any part that wasn't owned by AT&T), allowing interested users to study or enhance those parts of the system. However this source code was subject to the same license terms as the binary part of the system – it was not free software. Amiga Unix also incorporated and depended upon many open source components, such as the GNU C Compiler and X Window System, and included their source code.

Like many other proprietary Unix variants with small market shares, Amiga Unix vanished into the mists of computer history when its vendor, Commodore, went out of business. Today, Unix-like operating systems such as Minix,[33] NetBSD,[34] and Linux are available for the Amiga platform.


Unsubstantiated rumours of the adoption of the Amiga 3000UX as a product by Sun Microsystems have been presented in various online venues,[35] despite Sun already fielding a comprehensive workstation range and pursuing a technological direction that was leading the company away from Motorola's 68000 family and towards Sun's favoured SPARC architecture, describing demand for 68000 family systems as "very, very low".[36] One instance of coverage of such rumours that appeared in contemporary print media characterised such rumours as "an amusing tidbit" with the author presciently regarding the rumoured development as unlikely.[37]: 60

Other rumours supposedly persisted towards the beginning of 1990 that Hewlett-Packard had been "negotiating to buy Commodore", only to pull out, eliciting later claims of HP workstations with "suspiciously Amiga-like specifications".[38] Such commentary was evidently oblivious to HP's existing extensive workstation ranges, including Motorola-based systems, and its 1989 acquisition of Apollo Computer in pursuit of workstation market share and application support. Indeed, this acquisition led to a degree of duplication in HP's Motorola-based product ranges in need of careful resolution, but brought with it numerous Apollo developers and customers. Such considerations and benefits would have been largely absent in any hypothetical Commodore acquisition.[39]

See also


  1. ^ a b Smith, Ben (December 1990). "Short Takes: A Unix graphics workstation for the rest of the world". Byte. Vol. 15, no. 13. pp. 134, 136. Retrieved 25 February 2024.
  2. ^ a b "Commodore (R) Puts Power of UNIX Within More Amiga Users' Reach" (Press release). Commodore Business Machines, Inc. 12 February 1992. Retrieved 18 April 2024.
  3. ^ Commodore Amiga 3000UX Born To Run UNIX SVR4 (PDF). Commodore Business Machines, Inc.
  4. ^ "Unix: The Latest Frontier". Amiga World. April 1991. p. 10. Retrieved 7 March 2024.
  5. ^ a b c Catchings, Bill; Van Name, Mark L. (April 1990). "Computer du Jour: Amiga Unix". Amiga World. p. 40. Retrieved 5 April 2024.
  6. ^ a b Dunnington, Benn (January–February 1989). "COMDEX". Info. p. 38. Retrieved 4 April 2024.
  7. ^ Brown, Mark R. (January–February 1989). "LA AMIEXPO". Info. p. 36. Retrieved 4 April 2024.
  8. ^ "Big Booboo". Info. March–April 1989. p. 68. Retrieved 4 April 2024.
  9. ^ Jacobson-Gonzalez, Max (January 1989). "The Amiga Goes Unix". Amiga User International. pp. 30–32. Retrieved 30 April 2024.
  10. ^ Langa, Fred (May 1989). "A Lot of Company". Byte. p. 6. Retrieved 18 April 2024.
  11. ^ Martin, David W. (December 1990). "UNIX On The AMIGA". Info. pp. 68–69. Retrieved 4 April 2024.
  12. ^ a b c d Burgard, Mike (December 1991). "More than a Toy but No Bargain" (PDF). UnixWorld. Archived from the original (PDF) on 18 December 2007. Retrieved 25 February 2024.
  13. ^ "Amiga Unix: A Hands-On Look". .info. June 1991. p. 44. Retrieved 7 March 2024.
  14. ^ "A2410 Hi-Res Graphics Card". Amazing Computing. September 1991. p. 17. Retrieved 7 March 2024.
  15. ^ "Commodore Amiga 3000UX bundle". Archived from the original on 25 July 2020. Retrieved 25 February 2024.
  16. ^ "A2410 High Resolution Color Graphics Card". AC's Guide. Winter 1993. p. 14. Retrieved 7 March 2024.
  17. ^ "HP Announces 9000 Model 340". HP Professional. Vol. 3, no. 1. January 1989. p. 23. Retrieved 17 April 2024.
  18. ^ Alexander, Michael (25 September 1989). "PC, workstation firms prepare for price war". Computerworld. p. 4. Retrieved 5 March 2024.
  19. ^ a b Sharp, Bill (10 October 1989). "Low-End Workstation Market". HP Professional. pp. 42–44, 46. Retrieved 5 March 2024.
  20. ^ Daly, James (7 May 1990). "Sun to lower stakes with Sparc entry". Computerworld. pp. 1, 8. Retrieved 14 November 2023.
  21. ^ Baran, Nick (May 1989). "Two Powerful Systems from Sun". Byte. pp. 108–112. Retrieved 10 March 2024.
  22. ^ "Commodore Launches Unix Machine". The Computer Paper. Vol. 4, no. 4. April 1991. pp. 19, 21. Retrieved 7 March 2024.
  23. ^ Born to Run UNIX SVR4. Commodore Business Machines, Inc.
  24. ^ Baran, Nick; Linderholm, Owen (November 1990). "Fast New Systems from NeXT". Byte. pp. 165–168. Retrieved 25 February 2024.
  25. ^ Wilson, David (October 1992). "Tested Mettle". Unix Review. pp. 49–50, 52, 54, 57–58. Retrieved 24 April 2022.
  26. ^ Barney, Douglas (30 July 1990). "Amiga: It's not just for games anymore". Computerworld. p. 19. Retrieved 3 June 2024.
  27. ^ "No Unix for Europe". Amiga Computing. April 1990. p. 15. Retrieved 3 June 2024.
  28. ^ Yager, Tom (October 1991). "Hewlett-Packard's 425e Shows Off the Power of the 68040". Byte. pp. 239–240, 242. Retrieved 29 April 2024.
  29. ^ "Unix reseller appointed". Amiga Computing. February 1992. p. 10. Retrieved 30 April 2024.
  30. ^ "Jeff Earl: Commodore's man in the hot seat". Amiga Computing. November 1989. p. 23. Retrieved 30 April 2024. These guidelines will encompass Amiga Unix, so that the high flying executive can switch between an Amiga under AmigaDos. Amiga running Unix or the company mainframe running Unix, without having to be aware of which machine or operating system is doing the work.
  31. ^ "Unix Super Beta Site". Amazing Computing. October 1990. p. 4. Retrieved 7 March 2024.
  32. ^ "Amiga Unix Ticking at Tech". Amiga World. April 1991. p. 11. Retrieved 7 March 2024.
  33. ^ Marshall, Angus (January 1993). "You Little Minix!". Amiga Shopper. pp. 86–87. Retrieved 30 April 2024.
  34. ^ Goodwin, Simon N. (September 1996). "Unix for Free". Amiga Format. pp. 28–30. Retrieved 2 May 2024.
  35. ^ "A3000UX - Commodore". Big Book of Amiga Hardware. Retrieved 19 April 2024. Shortly after release, Sun Microsystems, a major UNIX vendor was interested in rebadging the A3000UX for supplying as an entry level UNIX workstation. Unfortunately in true Commodore style, the deal fell through.
  36. ^ Daly, James; Pastore, Richard (2 April 1990). "Motorola '030 sales in jeopardy". Computerworld. pp. 1, 118. Retrieved 2 May 2024.
  37. ^ Bandito, The (November 1990). "Roomers". Amazing Computing. pp. 59–62. Retrieved 30 April 2024.
  38. ^ "The Rumor Mill". Info. March 1991. p. 18. Retrieved 19 April 2024.
  39. ^ King, Peggy (June 1989). "Now That HP And Apollo Are No. 1..." HP Professional. pp. 10, 12, 80–82, 84. Retrieved 19 April 2024.