UNIVAC 494

UNIVAC
Company type	Division
Industry	Computer hardware
Predecessor	Eckert–Mauchly Computer Corporation
Founded	1946
Founder	J. Presper Eckert, John Mauchly
Defunct	1986
Fate	Merged into Sperry Computer Systems Division; later part of Unisys
Headquarters	Philadelphia, United States
Area served	Worldwide
Key people	William Norris (Vice-President & General Manager 1955–1957), Thornton C. Fry (VP & GM 1957–1959), Jay W. Schnackel (VP & GM 1959–1962), Dr. Louis T. Rader (President 1962–1964), J. Frank Forster (President 1964–1966), Robert E. McDonald (President 1966–1971), Gerald G. Probst (President 1971–1978), Richard L. Gehring (President 1978–1981), Joseph J. Kroger (President 1981–1985)
Products	Electronic digital stored-program computers, including UNIVAC I, BINAC, UNIVAC II, UNIVAC III, UNIVAC 418 series, UNIVAC 490 series, UNIVAC 1100/2200 series, Series 90, System 80 series
Parent	Remington Rand; later Sperry Rand and Sperry Corporation; eventually Unisys

UNIVAC (an acronym for Universal Automatic Computer) refers to a series of electronic digital stored-program computers that originated from the Eckert–Mauchly Computer Corporation. Subsequently, the name became associated with a division within Remington Rand and its successor companies.

The BINAC, developed by Eckert and Mauchly, holds the distinction of being the first commercially available general-purpose computer, although it achieved limited practical application. The production of UNIVAC computers concluded in 1986.

History and structure

Between 1943 and 1946, J. Presper Eckert and John Mauchly designed the ENIAC at the University of Pennsylvania. Following legal disputes over patents, they established the Electronic Control Company, which was later renamed Eckert–Mauchly Computer Corporation (EMCC) and headquartered in Philadelphia. EMCC created the BINAC for Northrop Aviation; however, it saw minimal utilization. In 1946, EMCC began work on developing UNIVAC, initially funded by the Bureau of the Census.

After EMCC's chairman Henry L. Straus passed away in 1949, Remington Rand acquired EMCC in 1950. Post-acquisition, Eckert and Mauchly reported to Leslie Groves, who had previously managed The Pentagon and the Manhattan Project.

The most prominent UNIVAC system was the UNIVAC I mainframe introduced in 1951. It gained widespread attention for correctly forecasting Eisenhower's decisive victory in the 1952 U.S. presidential election—a prediction that sharply contrasted with prevailing polls at the time. Despite initial doubts from CBS news executives, UNIVAC’s forecast was accurate within 3.5% of the popular vote margin and four Electoral College votes.

In the same year, the United States Army commissioned a UNIVAC computer to aid in intricate mobilization planning that involved coordination across multiple industries and government agencies.

Manufacturing of UNIVAC computers took place at Remington Rand’s Eckert-Mauchly Division facility in Philadelphia, supplemented by engineering centers located in Norwalk, Connecticut. After acquiring Engineering Research Associates (ERA) in St. Paul, Minnesota, Remington Rand consolidated its Norwalk tabulating operations, ERA’s scientific computing efforts, and UNIVAC’s business computing units under the unified UNIVAC brand during the mid-1950s.

The merger of Remington Rand with Sperry Corporation in 1955 resulted in Sperry Rand. General Douglas MacArthur was appointed chairman of the newly formed company’s board, while Harry Franklin Vickers remained president and CEO. Under Sperry Rand leadership, the UNIVAC division was renamed Remington Rand Univac, with William Norris serving as Vice-President and General Manager.

Between 1955 and the early 1960s, leadership within the UNIVAC Division experienced multiple transitions amid organizational challenges:

#	Name	Years	Title
1	William Norris	1955–1957	Vice-President & General Manager
2	Thornton C. Fry	1957–1959	Vice-President & General Manager
3	Jay W. Schnackel	1959–1962	Vice-President & General Manager
4	Dr. Louis T. Rader	1962–1964	President
5	J. Frank Forster	1964–1966	President
6	Robert E. McDonald	1966–1971	President
7	Gerald G. Probst	1971–1978	President
8	Richard L. Gehring	1978–1981	President
9	Joseph J. Kroger	1981–1985	President of UNIVAC / Sperry Computer Systems Division

During the 1960s, UNIVAC was counted among eight leading American computer manufacturers collectively known as "IBM and the seven dwarfs]", alongside Burroughs, NCR, Control Data Corporation (CDC), General Electric (GE), RCA, and Honeywell. By the late 1970s, this group had become better recognized as "BUNCH"—an acronym representing Burroughs, Univac, NCR, CDC, and Honeywell—following GE and RCA’s withdrawal or divestiture from computer manufacturing.

In 1977 Sperry Rand expanded into the minicomputer sector by acquiring Varian Data Machines, operating under Sperry UNIVAC Minicomputer Operation; however, it did not secure a significant market presence.

To streamline corporate branding efforts, Sperry Rand rebranded its divisions accordingly—including Sperry Univac—and in 1978 divested non-computing assets to concentrate exclusively on computing businesses. The company also dropped "Rand" from its name to become Sperry Corporation. By 1981 Sperry Univac had grown into Sperry’s largest division with revenues reaching $2.7 billion.

By the mid-1980s, the distinctive Sperry UNIVAC brand was discontinued as it merged into the Sperry Computer Systems Division.

In 1986 Sperry combined forces with Burroughs Corporation, creating Unisys. Following this merger, Unisys shifted focus away from manufacturing toward IT services and outsourcing sectors to compete with companies such as IBM, Electronic Data Systems (EDS), and Computer Sciences Corporation.

As of , Unisys continues to develop and produce enterprise-grade computer systems through its ClearPath server product line.

Models

UNIVAC developed a variety of model families throughout its history. Initial vacuum tube-based systems, which were rebranded versions of ERA 1101 computers, were designated as UNIVAC 110x; however, these were distinct from the later 1100/2200 product lines. Among these early models, the 1103A stood out as the first computer to implement interrupt processing.

The original UNIVAC I (Universal Automatic Computer I), recognized as the second commercially available computer in the United States, utilized mercury delay-line memory storing 1,000 words of 12 alphanumeric characters each. This system was delivered in March 1951.

Remington Rand introduced the 409 model as a plugboard-controlled punched card calculator, marketed under the names UNIVAC 60 (1952) and UNIVAC 120 (1953).

The UNIVAC File Computer, launched in 1956, featured up to ten sizable drums capable of storing 180,000 alphanumeric characters apiece. It found applications in airline reservation systems such as those for Eastern Air Lines and competed with IBM’s 650 and 305 RAMAC, with approximately 130 units produced.

The UNIVAC II, released in 1958, enhanced its predecessor by incorporating magnetic core memory ranging from 2,000 to 10,000 words and improved tape drives compatible with PET film tapes. This model also introduced partial transistor technology while retaining vacuum tubes and maintained full software compatibility with UNIVAC I along with additional instructions.

Aimed at business clients, the UNIVAC Solid State featured a decimal architecture and drum memory design utilizing magnetic logic gates instead of transistors to ensure greater reliability. It was available in two variants supporting different punched card formats.

In 1962, Sperry Rand delivered the binary-compatible UNIVAC III, which preserved backward compatibility with decimal and alphanumeric data formats; production was limited to only 96 units.

The UNIVAC 418 series, equipped with an 18-bit core memory architecture, began shipping in 1962. Over three models, more than 392 units were manufactured.

Designed for both military and commercial purposes, the UNIVAC 490 (including the military-specific UNIVAC 1232 variant) featured a 30-bit word length and core memory capacity up to 32K words; its successor, the UNIVAC 492, expanded this capacity to 64K words.

Following these models, the UNIVAC 494 offered faster central processing units, expanded core memory up to 262K words, multiple input/output channels, optional magnetic drum storage devices, and ran either the OMEGA operating system or customized systems like CONTORTS tailored for airline reservation applications.

Introduced in 1963, the UNIVAC 1050 was a one-address architecture machine supporting up to 32K six-bit character memory. It gained widespread use within the U.S. Air Force for inventory management systems.

The UNIVAC 1004 (1962) was a punched-card system programmed via plugboard, featuring less than one thousand characters of core memory and peripherals such as card readers/punches and tape drives. It functioned effectively as a remote card reader/printer and included an emulator board created by customers to execute card deck programs.

An evolution of the previous model, the UNIVAC 1005 (1966) incorporated additional peripherals including paper tape readers and stackers. Equipped with a two-stage assembler, it supported military battlefield operations as well as Autodin network nodes. Two variants existed: Federal Systems for military use and Commercial Systems; while hardware was shared between them, instruction sets differed.

The UNIVAC 1100/2200 series consisted of transistorized systems with a compatible architecture based on a 36-bit word length. The series began with the delayed Thin-Film Memory-equipped 1107 model. Its successful successor, the 1108, helped establish competitiveness against IBM’s System/360 line. Unisys continues to support this lineage through ClearPath Forward Dorado systems today.

Launched in the mid-1960s to rival IBM’s lower-end System/360 offerings, the UNIVAC 9000 series (models ranging from 9200 to 9700) implemented subsets of IBM’s architecture under patent settlement agreements. These computers utilized plated-wire memory and EBCDIC encoding and ranged from entry-level batch-processing systems to more capable configurations supporting disk storage and tape drives.

The UNIVAC Series 90 encompassed:

High-end configurations (90/60, 90/70, 90/80): advanced successors of high-end UNIVAC 9000 machines featuring virtual memory capabilities similar to IBM System/370 mainframes.
Low-end models (90/25, 90/30, 90/40): introduced around the mid-1970s as upgrades for existing customers and competitors to IBM System/3 systems. These ran OS/3 operating system supporting multitasking and programming languages such as COBOL-74 and RPG2. Hardware enhancements included increased clock speeds and expanded memory capacity up to one megabyte.

In the early 1980s, the Sperry UNIVAC System 80 series replaced the Series 90 lineup with models developed by Mitsubishi that resembled IBM/360 mainframes architecturally. The last model produced by Unisys in this series was the model 7E released in 1990.

Operating systems

The 1107 marked the introduction of the first 36-bit, word-oriented computer featuring an architecture closely resembling the subsequent "1100 Series." It operated on the EXEC I or EXEC II operating systems, which were batch-processing, second-generation OSs characteristic of the early to mid-1960s. The 1108 model supported either EXEC II or EXEC 8, the latter providing capabilities for concurrent real-time processing, time-sharing, and background batch jobs. The Transaction Interface Package (TIP) facilitated the development of transaction-processing software in COBOL, a notable advantage over competitors that required assembly language programming. EXEC 8 later developed into OS 1100 and OS 2200, with contemporary iterations preserving backward compatibility. Certain versions of the 1108 also ran RTOS, a streamlined operating system tailored for enhanced hardware efficiency.

The economical System 80 series of compact mainframes utilized OS/3, an operating system initially created for the Univac 90/30 and subsequently modified for use with the 90/25 and 90/40 models.

The UNIVAC Series 90 originally employed Univac’s OS/9 but eventually transitioned to RCA's Virtual Memory Operating System (VMOS). Initially designated as Time Sharing Operating System (TSOS) for RCA's Spectra 70 virtual memory machines, it was renamed VMOS before Sperry acquired RCA CSD. After adapting VMOS for the 90/60 model, Univac rebranded it as VS/9.

Trademark

UNIVAC has been a registered trademark under the ownership of:

External links

UNIVAC Conference Oral History, 17–18 May 1990 – Charles Babbage Institute, University of Minnesota. Transcript includes interviews with 25 engineers, programmers, and marketing staff involved with UNIVAC and clients such as General Electric and Arthur Andersen.
Oral History Interview with Isaac Levin Auerbach – Charles Babbage Institute, University of Minnesota, 1978. Auerbach discusses his contributions at Electronic Control Company (later Eckert–Mauchly Computer Company), the BINAC project for Northrop Aircraft, and UNIVAC development.
UNIVAC Memories
Unisys History Newsletter Archive
Universal Automatic Computer Model II
UNIVAC 1004 80/90 Card Processor
The Case 1107
EXEC II – Unisys History Newsletter
UNIVAC Timeline
Functional UNIVAC 9400 in German computer museum
UNIVAC Simulator 1.2 – Shareware simulator for UNIVAC I and II by Peter Zilahy Ingerman
UNIVAC I/II Console Photos and Marketing Documentation (Off The Broiler blog)
UNIVAC Television Advertisement Archive
Sperry Corporation, UNIVAC Division Photograph Collection – Hagley Museum and Library
Sperry Rand Corporation, Univac Division Records – Hagley Museum and Library
Sperry-UNIVAC Records – Hagley Museum and Library
Remington-Rand Presents the Univac Video