# Apollo Computer

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American computer manufacturer (1980–1989)

This article is about the computer manufacturer. For the Apollo spacecraft computer, see [Apollo Guidance Computer](/source/Apollo_Guidance_Computer).

Apollo Computer Inc. Industry Apollo/Domain workstations Founded 1980; 46 years ago (1980) Founder William Poduska Fate Acquired by Hewlett-Packard in 1989 Headquarters Chelmsford, Massachusetts

**Apollo Computer Inc.** was an American technology corporation headquartered and founded in [Chelmsford, Massachusetts](/source/Chelmsford%2C_Massachusetts). It was founded in 1980 by [William Poduska](/source/William_Poduska) (a founder of [Prime Computer](/source/Prime_Computer)) and others. Apollo Computer developed and produced [Apollo/Domain](/source/Apollo%2FDomain) [workstations](/source/Workstation) in the 1980s. Along with [Symbolics](/source/Symbolics) and [Sun Microsystems](/source/Sun_Microsystems), Apollo was one of the first vendors of [graphical workstations](/source/Graphical_workstation). Like other computer companies at the time, Apollo produced much of its own hardware and software.

Apollo was acquired by [Hewlett-Packard](/source/Hewlett-Packard) in 1989 for US$476 million (equivalent to $1236 million in 2025), and gradually closed down over the period of 1990–1997. The brand (as "HP Apollo") was resurrected in 2014 as part of HP's [high-performance computing](/source/Supercomputer) portfolio.[1][2]

## History

Apollo dn330 at Chelmsford, MA, c. 1985

Apollo was started in 1980, two years before rival [Sun Microsystems](/source/Sun_Microsystems).[3] In addition to Poduska, the founders included Dave Nelson (engineering), Mike Greata (engineering), Charlie Spector (COO), Bob Antonuccio (manufacturing), Gerry Stanley (sales and marketing), and Dave Lubrano (finance).[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*] The founding engineering team included Mike Sporer, Bernie Stumpf, Russ Barbour, Paul Leach, and Andy Marcuvitz.[4]

Apollo was the first to release a standalone [workstation](/source/Workstation).[3][5] In 1981, the company unveiled the [DN100](/source/Apollo_DN100) workstation, which used the [Motorola 68000](/source/Motorola_68000) [microprocessor](/source/Microprocessor). Apollo workstations ran [Aegis](/source/Domain%2FOS#AEGIS) (later replaced by [Domain/OS](/source/Domain%2FOS)), a proprietary [operating system](/source/Operating_system) with a [Unix](/source/Unix) alternative [shell](/source/Shell_(computing)). Apollo's networking was particularly elegant, among the first to allow [demand paging](/source/Demand_paging) over the network, and allowing a degree of [network transparency](/source/Network_transparency) and low [sysadmin](/source/Sysadmin)-to-machine ratio.

From 1980 to 1987, Apollo was the largest manufacturer of network workstations.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*] Its quarterly sales exceeded $100 million for the first time in late 1986,[6] and by the end of that year, it had the largest worldwide share of the engineering workstations market, at twice the market share of the number two, [Sun Microsystems](/source/Sun_Microsystems).[7] At the end of 1987, it was third in market share after [Digital Equipment Corporation](/source/Digital_Equipment_Corporation) and Sun, but ahead of [Hewlett-Packard](/source/Hewlett-Packard) and [IBM](/source/IBM).[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*] Apollo's largest customers were [Mentor Graphics](/source/Mentor_Graphics) (electronic design), [General Motors](/source/General_Motors), [Ford](/source/Ford_Motor_Company), [Chrysler](/source/Chrysler), Chicago Research and Trading (Options and Futures) and [Boeing](/source/Boeing).[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

Apollo was acquired by [Hewlett-Packard](/source/Hewlett-Packard) in 1989 for US$476 million,[8] and gradually closed down over the period 1990-1997. But after acquiring Apollo Computer in 1989, HP integrated a lot of Apollo technology into their own [HP 9000](/source/HP_9000) series of workstations and servers. The Apollo engineering center took over PA-RISC workstation development and Apollo became an HP workstation brand name (*HP Apollo 9000*) for a while. Apollo also invented the [revision control](/source/Revision_control) system *DSEE* ([Domain](/source/Apollo_Domain) Software Engineering Environment)[9] which inspired IBM [IBM DevOps Code ClearCase](/source/IBM_DevOps_Code_ClearCase).[10] DSEE was pronounced "dizzy".

Aegis, like [Unix](/source/Unix), was based on concepts from the [Multics](/source/Multics) [time-sharing](/source/Time-sharing) operating system. It used the concepts of shell programming (à la [Stephen Bourne](/source/Stephen_Richard_Bourne)), [single-level store](/source/Single-level_store), and [object-oriented design](/source/Object-oriented_design). Aegis was written in a proprietary version of [Pascal](/source/Pascal_(programming_language)).

The dual 68000 processor configuration was designed to provide automatic [page fault](/source/Page_fault) switching, with the main processor executing the OS and program instructions, and the "fixer" processor satisfying the page faults. When a page fault was raised, the main CPU was halted in mid (memory) cycle while the fixer CPU would bring the page into memory and then allow the main CPU to continue, unaware of the page fault.[11] Later improvements in the [Motorola 68010](/source/Motorola_68010) processor obviated the need for the dual-processor design.

Certain efficiencies were gained by careful design; for example, the memory page size, [network packet](/source/Network_packet), and [disk sector](/source/Disk_sector) were all 1K byte in size. With this arrangement, a page fault could take place across the network as well as on the individual computer and Aegis [file system](/source/File_system) was a single system of [memory mapped files](/source/Memory_mapped_file) across the entire network. The namespace of the network was self discovering as new nodes (workstations) were added.

Domain/OS (Distributed On-line Multi-access Interactive Network/Operating System) was initially a layer over Aegis and was not built on a Unix [kernel](/source/Kernel_(operating_system)). Release 10 incorporated large parts of Unix but the burden of [backwards compatibility](/source/Backwards_compatibility) with previous releases led to a system that was larger and significantly slower than the previous ones. In the end, Hewlett Packard shut down the Domain/OS line. Release 10 came out as competitors were gaining ground in the area of graphics and windowing systems, particularly with the trend to [open systems](/source/Open_system_(computing)) and the [X Window System](/source/X_Window_System).

Another feature was its proprietary [token ring](/source/Token_passing) network, which was originally designed to support relatively small networks of, at most, dozens of computers in an office environment. It was a superb design, allowing [direct memory access](/source/Direct_memory_access) page faulting from any [hard drive](/source/Hard_drive) on the network, but it did not inter-operate with any other existing network hardware or software. The industry widely adopted [Ethernet](/source/Ethernet) and [TCP/IP](/source/TCP%2FIP), a more universal, albeit much slower network. Apollo later added support for these industry standards while continuing to support its own Domain networking using both [Ethernet](/source/Ethernet) and token ring. The Domain network routing was modeled after [Xerox Network Systems](/source/Xerox_Network_Systems).

The company moved from a proprietary [data bus](/source/Bus_(computing)) architecture in favor of IBM's [AT-bus](/source/Industry_Standard_Architecture), as used in the second generation of IBM PCs, and was simultaneously embracing [RISC](/source/RISC) technology moving towards high-end processors, eventually producing the [PRISM](/source/Apollo_PRISM) line.

The workstation industry in general experienced hard times in the second half of the 1980s, as [IBM Personal Computers](/source/IBM_Personal_Computer) and [IBM PC compatibles](/source/IBM_PC_compatible) began making inroads on their customer base.

Thomas Vanderslice was hired as President and CEO in 1984,[12] and founder William Poduska left the company in 1985 to found [Stellar](/source/Stardent_Inc.).[13]

The company incurred large losses in 1987 in currency speculation due to the trading activities of one individual,[14] and in 1988 from declining demand for its products.[15] In 1989, Apollo was acquired by Hewlett-Packard for US$476 million (equivalent to $1236 million in 2025).[16] HP support for Apollo products was fragmented for the first few years, but was reorganized in late 1992, at which point there were still some 100,000 users of Apollo products and the user group InterWorks had some 4,500 members.[17] Earlier that year, Sun had already offered discounts on its systems for customers trading in their Apollo machines;[18] HP responded the next winter with a trade-in program of its own, that also allowed trading in hardware from Sun and other vendors in return for a discount on HP workstations.[19]

Apollo was gradually closed down over the period of 1990–1997.

## Models

Apollo Computer models System Type Model CPU Speed (MHz) Display Release date Internal name SAU1 DN416 2× 68000 8 Portrait black & green SAU1 DN100 2× 68000 8 Portrait BW SAU1 DN400 2× 68000 8 Portrait BW SAU1 DN600 2× 68000 8 Color SAU1 DN420 2× 68000 8 Landscape BW SAU2 DN300 68010 8 Landscape BW Swallow SAU2 DN320 68010 8 Landscape BW Swallow SAU2 DN330 68020 12 Landscape BW Swallow SAU3 DSP80, DSP80A 68010 8 none Sparrow SAU3 DSP90 68020 12 none Sparrow SAU4 DN460 Custom 2900 bit slice ? BW Tern SAU4 DN660 Custom 2900 bit slice ? Color Tern SAU4 DSP160 Custom 2900 bit slice ? none Tern SAU5 DN550 68010 10 VME 600 Graphics Stingray SAU5 DN560 68020 12 VME 600 Graphics Stingray SAU5 DN570 68020 16 Ocelot Graphics Single Card 8 plane Banshee SAU5 DN580 68020 16 Aurora Graphics Banshee SAU5 DN590 68020 20 Aurora Graphics Banshee SAU6 DN560T 68020 12 Color Banshee SAU6 DN570T 68020 16 Color Banshee SAU6 DN580T 68020 16 Color Banshee SAU6 DN590T 68020 20 Color Banshee SAU7 DN3500 68030 25 BW / Color Cougar II SAU7 DN3550 68030 25 BW / Color SAU7 DN4000 68020 25 BW / Color Mink SAU7 DN4500 68030 33 BW / Color Roadrunner SAU8 DN3000 68020 12 BW / Color Otter SAU8 DN3010, DN3010A 68020 12 BW / Color SAU8 DN3040 68020 12 BW / Color SAU9 DN2500 68030 20 BW / Color Frodo SAU10 DN10000 PRISM 18 BW / Color AT SAU11 9000/425S 68040 25 Trailways SAU11 9000/425T 68040 25 HP DIOII Strider SAU11 9000/425E 68040 25 Woody SAU11 9000/433S 68040 33 Trailways SAU11 9000/433T 68040 33 SAU12 9000/400S 68030 50 Trailways SAU12 9000/400T 68030 50 Strider SAU12 9000/400DL 68030 50 SAU14 DN5500 68040 25 BW / Color Leopard

## See also

- [Apollo/Domain](/source/Apollo%2FDomain)

- [Apollo PRISM](/source/Apollo_PRISM)

- [Atria Software](/source/Atria_Software)

- [Domain/OS](/source/Domain%2FOS)

## References

1. **[^](#cite_ref-1)** ["HP Redefines HPC and Supercomputing Market with New Portfolio"](http://www.hp.com/hpinfo/newsroom/press_kits/2014/HPDiscover2014/HPApollo.pdf) (PDF). Hewlett-Packard Company. June 9, 2014.

1. **[^](#cite_ref-2)** ["Data sheet | HP Apollo 8000 System"](http://www.hp.com/hpinfo/newsroom/press_kits/2014/HPDiscover2014/Apollo8000datasheet.pdf) (PDF). Hewlett-Packard Company. June 2014.

1. ^ [***a***](#cite_ref-baran198902_3-0) [***b***](#cite_ref-baran198902_3-1) Baran, Nick (February 1989). ["Two Worlds Converge"](https://archive.org/details/eu_BYTE-1989-02_OCR/page/n284/mode/1up?view=theater). *BYTE*. pp. 229–233. Retrieved 2024-10-08.

1. **[^](#cite_ref-4)** McLellan, Vin. ["APOLLO IS LAUNCHED"](https://archive.org/details/bitsavers_datamation_42495517/page/n47/). *Datamation*. Vol. 26, no. 11. Retrieved 12 June 2025.

1. **[^](#cite_ref-nicholls198902_5-0)** Nicholls, Bill (February 1989). ["The Current Crop"](https://archive.org/details/eu_BYTE-1989-02_OCR/page/n290/mode/1up?view=theater). *BYTE*. pp. 235–244. Retrieved 2024-10-08.

1. **[^](#cite_ref-6)** Petrovsky, Mary (27 October 1986). ["3Com and Apollo sign pact for net link gear"](https://books.google.com/books?id=Ex4EAAAAMBAJ&pg=PA7). *Network World*. Vol. 3, no. 34. p. 7.

1. **[^](#cite_ref-7)** ["Market overview"](https://books.google.com/books?id=ejwEAAAAMBAJ&pg=PA29). *[InfoWorld](/source/InfoWorld)*. Vol. 8, no. 48. 1 December 1986. p. 29.

1. **[^](#cite_ref-8)** Lazzareschi, Carla (13 April 1989). ["Hewlett-Packard to Buy Struggling Apollo Computer"](https://www.latimes.com/archives/la-xpm-1989-04-13-fi-1841-story.html). *[Los Angeles Times](/source/Los_Angeles_Times)*.

1. **[^](#cite_ref-9)** McDermid, John A (1990). ["Integrated Project Support Environments"](https://books.google.com/books?id=sDczTOXm6aoC&pg=PA55). In [Barbara A. Kitchenham](/source/Barbara_Kitchenham) (ed.). *Software Engineering for Large Software Systems*. Elsevier Science Publishers. p. 55. [ISBN](/source/ISBN_(identifier)) [1-85166-504-8](https://en.wikipedia.org/wiki/Special:BookSources/1-85166-504-8).

1. **[^](#cite_ref-10)** Adams, Paul; Solomon, Marvin (18 October 1995). ["An overview of the CAPITL software development environment"](https://books.google.com/books?id=fZsN5X3HCIoC&pg=PA25). In Jacky Estublier (ed.). *Software configuration management: selected papers / ICSE SCM-4 and SCM-5 Workshops*. Springer-Verlag, Berlin, Heidelberg etc. p. 25. [ISBN](/source/ISBN_(identifier)) [3-540-60578-9](https://en.wikipedia.org/wiki/Special:BookSources/3-540-60578-9).

1. **[^](#cite_ref-11)** [*Virtual memory using the MC68000 and the MC68451 MMU*](http://marc.retronik.fr/motorola/68K/68000/DC001_Virtual_Memory_Using_The_MC68000_and_the_MC68451_MMU_%5bMotorola_1982_9p%5d.pdf) (PDF)

1. **[^](#cite_ref-12)** "Vanderslice Named President of Apollo". Boston Globe. August 3, 1984.

1. **[^](#cite_ref-13)** "Poduska Will Leave Apollo To Start Firm". Boston Globe. November 15, 1985.

1. **[^](#cite_ref-14)** "Apollo Says It Underestimated Loss From Unauthorized Deal". Boston Globe. October 8, 1987.

1. **[^](#cite_ref-million_15-0)** Markoff, John. (July 8, 1988). ["Apollo's Troubles Stun Wall St"](https://www.nytimes.com/1988/07/08/business/apollo-s-troubles-stun-wall-st.html). *New York Times*.

1. **[^](#cite_ref-16)** "HP Seeks To Reassure Apollo Workers". Boston Globe. May 23, 1989.

1. **[^](#cite_ref-17)** Johnson, Maryfran (14 September 1992). ["Domain users OK latest HP support plan"](https://books.google.com/books?id=Kd79q0UEQc8C&pg=PA62). *Computerworld*. Vol. XXVI, no. 37. p. 62.

1. **[^](#cite_ref-18)** Johnson, Maryfran (20 July 1992). ["Sun upgrade offer targets Apollo users"](https://books.google.com/books?id=wJswszKTwl4C&pg=PA8). *Computerworld*. Vol. XXVI, no. 29. p. 8.

1. **[^](#cite_ref-19)** Johnson, Maryfran (1 February 1993). ["HP trade-in push"](https://books.google.com/books?id=Q3uWYPSLDrcC&pg=PA41). *Computerworld*. Vol. 27, no. 5. p. 41.

This article was partly based on material from the *[Free On-line Dictionary of Computing](/source/Free_On-line_Dictionary_of_Computing)* and is used with permission under the [GFDL](/source/GFDL).

## External links

- [HP Domain Apollo Series](https://www.angelfire.com/ca2/tech68k/domain.html)

- [More on Sun vs. Apollo](https://web.archive.org/web/20060715082212/http://www.sims.berkeley.edu/~anno/papers/limits_autarky.html)

- [The Apollo Archive](http://jim.rees.org/apollo-archive/)

- [Apollo CPUs table](https://web.archive.org/web/19970330111439/http://www.zepa.net/cgi-bin/apollo-cpus.cgi)

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Adapted from the Wikipedia article [Apollo Computer](https://en.wikipedia.org/wiki/Apollo_Computer) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Apollo_Computer?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.