DECUS
| Company type | User group |
|---|---|
| Industry | Computer software and hardware |
| Founded | March 1961 |
| Founder | Edward Fredkin |
| Defunct | May 2008 |
| Fate | Merged into Connect User Group Community |
Area served | Worldwide |
Key people | Edward Fredkin (founder) |
| Products | Software library, user conferences, technical symposia |
The Digital Equipment Computer Users' Society (DECUS) functioned as an autonomous computer user group linked to Digital Equipment Corporation (DEC). In May 2008, the Connect User Group Community was created through the unification of DECUS, Encompass, HP-Interex, and ITUG. Today, Connect stands as the largest user community under Hewlett-Packard, representing a membership exceeding 50,000 individuals.
History
Founded in March 1961 by Edward Fredkin, DECUS served as a dedicated users' organization for DEC computer systems. Its membership base consisted of companies and institutions purchasing DEC hardware, alongside application and system programmers responsible for developing and maintaining DEC environments.
Although legally under the umbrella of Digital Equipment Corporation and financially supported by the company, DECUS was managed by volunteers who did not receive compensation. Employees of Digital were excluded from formal membership but were encouraged to participate in DECUS initiatives. The corporation viewed DECUS as an essential platform for direct communication with its client base.
DECUS Software Library
The society maintained a software repository that collected and redistributed programs contributed by members willing to share their work. These submissions were categorized according to processor type and operating system, accompanied by signed documentation granting redistribution rights. Annual catalogs listing available software were published; however, early editions before 1980 were less accessible in machine-readable formats due to outsourcing arrangements. Later catalogs were produced internally, allowing for greater flexibility in updates. The cost for copying materials was relatively steep, reflecting the manual duplication process performed on DECUS equipment.
Activities
DECUS organized two symposia each year in the United States, which featured technical presentations and an exhibition area highlighting new computing hardware and peripheral devices. Initially, attendees duplicated media using DEC machines onsite; this practice evolved into structured master distributions coordinated by RSX SIG volunteers starting in 1977. By 1979, duplication facilities located near symposium venues enhanced tape copying reliability, while release agreements permitted redistribution beyond event participants. Various Special Interest Groups (SIGs)—including VAX/VMS, RSTS, RT-11, Languages and Tools, and 10/20—regularly produced tape-based software distributions.
To broaden access beyond symposium attendees, a volunteer "tree" system was implemented enabling members to copy materials for others who provided blank media. Over time, distribution media shifted from tapes to 8mm Exabyte cartridges, then to CDs and DVDs as content volume increased. RSX SIG tape distributions continued until 1992; subsequently, some RSX content was incorporated into VMS SIG tapes. These distributions occurred biannually until 2005 and then annually until 2007, after which network-based delivery largely replaced physical media.
SIG tape collections contained comprehensive source code and executable files that served as valuable prior art in patent litigation, with full source disclosure ensuring compliance with publication requirements. DECUS media remained publicly available though accessibility varied.
The U.S. Chapter also hosted technical conferences and supported Local User Groups (LUGs) along with Special Interest Groups (SIGs), fostering open sharing of user-created software predominantly via magnetic storage media.
DECUS played a pivotal role in shaping North American computer gaming during the 1970s by distributing landmark titles such as Adventure (Will Crowther), Baseball, Dungeon, Star Trek (Don Daglow), and Hunt the Wumpus (Gregory Yob). It also helped popularize early multi-user games like MTrek alongside commercial successes including Zork and Empire.
During the 1990s, DECUS contributed to integrating scientific, technological, and business sectors from post-Soviet states into the international marketplace.
Following Digital's acquisition by Compaq in 1998, DECUS transitioned into a Compaq user group. The technical conference persisted with Compaq unveiling innovations such as the Galaxy Software Architecture for OpenVMS in 1998 along with new hardware and software products in 1999.
In 1999, Compaq proposed merging DECUS with its other user group, the International Tandem Users' Group. Confidential merger discussions leaked to members led to internal criticism. Subsequently, in 2000, the DECUS U.S. Chapter established itself as an independent entity named Encompass.
After Hewlett-Packard's acquisition of Compaq in 2002, DECUS evolved into an HP User Society. By 2008, HP user groups Encompass, ITUG, and HP Interex EMEA merged to form Connect Worldwide.
Local chapters
Membership was structured by country, with each local group functioning under the umbrella of the worldwide Association of Hewlett-Packard User Groups. DECUS counted around 7,500 members, mainly comprising specialists in systems, networking, applications, as well as IT leadership.
The HP User Society DECUS served as a platform for exchanging expertise among its members, manufacturers, and collaborators. It assisted members in advocating their interests with HP and affiliated partners, provided support for troubleshooting, and encouraged the development of opinions and advanced education through organized gatherings.
Well-known members
Prominent early participants in DECUS included the late Terry Shannon and John R. Wisniewski.