UNIVAC 492

UNIVAC
Company type	Division
Industry	Computer hardware
Predecessor	Eckert–Mauchly Computer Corporation
Founded	1946
Founder	J. Presper Eckert, John Mauchly
Fate	Acquired by Remington Rand in 1950; later became part of Sperry Rand and then Unisys
Headquarters	Philadelphia, Pennsylvania, United States
Area served	Worldwide
Key people	William Norris (Vice-President & General Manager 1955–1957), Thornton C. Fry (Vice-President & General Manager 1957–1959), Jay W. Schnackel (Vice-President & General Manager 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	UNIVAC I, BINAC, UNIVAC II, UNIVAC III, UNIVAC 418, UNIVAC 490/492/494, UNIVAC 1050, UNIVAC 1004/1005, UNIVAC 1100/2200 series, UNIVAC 9000 series, UNIVAC Series 90
Parent	Remington Rand; later Sperry Rand; now Unisys

UNIVAC (an acronym for Universal Automatic Computer) referred to a series of electronic digital stored-program computers initially developed by the Eckert–Mauchly Computer Corporation. The designation later identified a business unit within Remington Rand and its successor entities.

The BINAC, created by Eckert and Mauchly, holds the distinction of being the first commercially available general-purpose computer, although its deployment was quite limited. The final machine bearing the UNIVAC name was manufactured in 1986.

History and organization

Between 1943 and 1946, J. Presper Eckert and John Mauchly engineered the ENIAC at the University of Pennsylvania. After encountering patent conflicts, they established the Electronic Control Company, which was subsequently renamed Eckert–Mauchly Computer Corporation (EMCC) based in Philadelphia. EMCC produced the BINAC for Northrop Aviation and commenced work on the UNIVAC project in 1946, initially supported financially by the Bureau of the Census.

Following the death of EMCC chairman Henry L. Straus in 1949, Remington Rand acquired EMCC in 1950. Eckert and Mauchly then reported to Leslie Groves, who had previously overseen The Pentagon and the Manhattan Project.

The most renowned product under the UNIVAC label was the 1951 UNIVAC I mainframe, which gained fame for accurately forecasting Dwight D. Eisenhower’s decisive victory in the 1952 presidential election—a prediction that sharply contrasted with prevailing poll results at the time. Despite initial doubts from CBS executives, UNIVAC’s forecast proved to be impressively accurate.

In 1951, a request from the United States Army led to a UNIVAC system being utilized to handle intricate mobilization planning tasks that required computational power beyond manual methods or simpler electronic devices.

Production took place at Remington Rand’s Eckert-Mauchly Division facility located in Philadelphia, supplemented by engineering laboratories in Norwalk, Connecticut, and, following acquisition, at Engineering Research Associates (ERA) in St. Paul, Minnesota. During the early 1950s, Remington Rand merged its Norwalk tabulating machines, ERA scientific computing efforts, and UNIVAC business computer operations into a single division branded as UNIVAC.

In 1955, Remington Rand merged with Sperry Corporation, creating Sperry Rand. General Douglas MacArthur continued as chairman while Harry Franklin Vickers remained president and CEO. Within Sperry Rand, the UNIVAC division was renamed Remington Rand Univac with William Norris appointed as Vice-President and General Manager.

This era was characterized by managerial turnover, culminating in Norris’s departure in 1957 and ongoing restructuring through the early 1960s that eventually elevated UNIVAC to a full-fledged division within Sperry Rand.

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

During the 1960s, UNIVAC was one of eight leading U.S.-based computer companies collectively referred to as "IBM and the seven dwarfs," alongside Burroughs, NCR, CDC, GE, RCA, and Honeywell—with IBM dominating the sector. After General Electric withdrew from computing and RCA sold its operations to Univac during the 1970s, this group became known as "BUNCH" (Burroughs, Univac, NCR, CDC, Honeywell).

Sperry Rand expanded into minicomputers by acquiring Varian Data Machines in 1977; Varian was rebranded as Sperry UNIVAC Minicomputer Operation but struggled to gain significant market traction.

To streamline corporate identity, Sperry Rand aligned its divisions under unified branding such as Sperry Univac. By 1978 it divested non-computer businesses to concentrate on computing technology and eliminated "Rand" from its corporate name. By 1981 Sperry Univac had become Sperry’s largest operating division with revenues reaching $2.7 billion.

Eventually, Sperry Univac branding was phased out in favor of Sperry Computer Systems Division. In 1986 Sperry merged with Burroughs Corporation, forming Unisys. Following this merger, Unisys shifted its emphasis from hardware manufacturing toward IT services and outsourcing solutions—competing with firms like IBM, Electronic Data Systems (EDS), and Computer Sciences Corporation.

As of , Unisys continues developing and producing enterprise-grade computers through its ClearPath server product line.

Models

Throughout its history, UNIVAC developed a variety of model families. The early vacuum tube-based machines, originally ERA 1101 systems rebranded as UNIVAC 110x, were distinct from the later 1100/2200 series. Notably, the UNIVAC 1103A is recognized as the first computer to implement interrupts.

The initial lineup began with the UNIVAC I (Universal Automatic Computer I), delivered in 1951 as the second commercial computer in the United States. It utilized mercury delay-line memory, storing 1,000 words composed of 12 alphanumeric characters each.

The Remington Rand 409, a punched-card calculator programmed via plugboard and designed in 1949, was marketed as the UNIVAC 60 in 1952 and later as the UNIVAC 120 in 1953.

Introduced in 1956, the UNIVAC File Computer incorporated up to ten large drums, each capable of holding 180,000 alphanumeric characters. This model found application in airline reservation systems, including those operated by Eastern Air Lines, competing with IBM products such as the IBM 650 and IBM 305 RAMAC. Approximately 130 units were manufactured.

Delivered in 1958, the UNIVAC II enhanced its predecessor by integrating magnetic core memory ranging from 2,000 to 10,000 words, upgrading tape drives to support metal or PET film tapes, and partially replacing vacuum tubes with transistors while maintaining backward compatibility with UNIVAC I software.

The UNIVAC Solid State was a decimal two-address computer that used a rotating drum memory containing 5,000 signed 10-digit words. Designed for business users, it was available in Solid State 80 and Solid State 90 variants supporting different punched card formats. This machine employed magnetic logic gates controlled by a limited number of vacuum tubes, improving reliability over earlier vacuum tube models.

In 1962, Sperry Rand introduced the UNIVAC III, producing a total of 96 units. This binary system supported backward compatibility with previous decimal and alphanumeric formats and represented the final generation of the original UNIVAC machines.

Also debuting in 1962 was the UNIVAC 418 (also known as model 1219), an 18-bit core memory computer with over three variants produced totaling more than 392 units.

The UNIVAC 490 was a military-grade system featuring a 30-bit word core memory and a cycle time of 4.8 microseconds; its military counterpart was designated the UNIVAC 1232. The UNIVAC 492 expanded memory capacity to accommodate up to 64K words.

Succeeding the 490/492 line, the UNIVAC 494 offered enhanced CPU speeds and supported up to 262K words of core memory along with as many as 24 input/output channels. Typically paired with magnetic drum storage, it operated either on the OMEGA operating system or custom variants such as CONTORTS for airline reservation applications.

Released in 1963, the UNIVAC 1050 featured up to 32K six-bit character memory and utilized PAL assembly language for programming. It was extensively employed by the U.S. Air Force for inventory management systems.

The UNIVAC 1004, introduced in 1962, functioned as a plugboard-programmed punched-card data processing device with nearly one thousand characters of core memory. Its peripherals included card readers and punches as well as tape drives. Additionally, it supported remote card reader/printer operations and offered an optional emulator board allowing program execution directly from card decks.

An improved version, the UNIVAC 1005, shipped beginning February 1966 and saw significant use by the U.S. Army including battlefield deployments. It incorporated additional peripherals and supported assembly languages SAAL and SARGE. Two variants existed: a military Federal Systems version and a Commercial Systems version; while sharing hardware platforms, these versions differed in their instruction sets.

The transistorized UNIVAC 1100/2200 series, starting with the initially delayed Thin-Film Memory-based UNIVAC 1107 but gaining prominence with the successful UNIVAC 1108 model, established Sperry Rand as a contender against IBM's System/360 mainframes. This series remains active today under Unisys branding as ClearPath Forward Dorado systems.

Targeting lower-end IBM System/360 market segments during the mid-1960s, the UNIVAC 9000 series (models including the 9200,9300,9400,and9700) implemented subsets of IBM’s architecture through licensing agreements resulting from patent settlements. These models featured plated-wire memory technology and supported standard IBM peripherals including EBCDIC encoding and common card formats. Memory configurations started as low as eight kilobytes with optional disk subsystems available.

The UNIVAC Series 90 encompassed:

High-end models (90/60,90/70,90/80): These succeeded high-end UNIVAC9000 machines by introducing virtual memory capabilities comparable to those found on IBM System/370 mainframes.
Low-end models (90/25,90/30,90/40): Released around the mid-1970s to upgrade existing installations while competing against IBM System/3 systems. These ran OS/3 operating system supporting multitasking along with popular business languages such as COBOL-74 and RPG2. Hardware included removable disk packs holding approximately100MB each, tape drives, printers capable of up to2,000 lines per minute, and communication controllers that managed multiple terminals simultaneously. The instruction set was microcoded and loaded during system boot-up.

Following these lines, Sperry Univac introduced the System80 series starting in1981 with models4 and6; more powerful versions (8,10,and20) became available by1984. Developed by Mitsubishi for Sperry Rand, these IBM/360-compatible mainframes culminated in model7E released under Unisys branding in1990.

Operating systems

The 1107 marked the introduction of the first 36-bit, word-oriented computer featuring an architecture resembling that of the subsequent "1100 Series." It operated using the EXEC I and EXEC II operating systems, which were standard batch-processing platforms typical of the early to mid-1960s' second generation. The 1108 model was compatible with EXEC II as well as EXEC 8, an OS that facilitated concurrent real-time processing, time-sharing, and simultaneous background batch jobs. The Transaction Interface Package (TIP) enabled developers to write transaction-processing applications in COBOL, a notable advantage over competitors that mandated assembly language programming. EXEC 8 later developed into OS 1100 and OS 2200, with contemporary versions preserving backward compatibility. Additionally, certain 1108 units operated RTOS, a streamlined operating system engineered to maximize hardware efficiency.

The economical System 80 series of compact mainframes utilized OS/3, which was derived from the Univac 90/30 system.

The UNIVAC Series 90 initially employed Univac's OS/9 but subsequently transitioned to RCA's Virtual Memory Operating System (VMOS). VMOS originated as the Time Sharing Operating System (TSOS) for RCA's Spectra 70 virtual memory machines and was renamed prior to Sperry's acquisition of RCA CSD. After porting VMOS to the 90/60 model, Univac rebranded it as VS/9.

Trademark

The UNIVAC name has been officially registered as a trademark by:

External links

UNIVAC Conference Oral History, May 1990 – Transcript featuring insights from 25 engineers, programmers, and marketing experts involved with UNIVAC, including representatives from General Electric, Arthur Andersen, and the U.S. Census. Hosted by the Charles Babbage Institute, University of Minnesota.
Oral History Interview with Isaac Levin Auerbach – Covers topics such as Electronic Control Company (later Eckert–Mauchly Computer Company), BINAC project, UNIVAC development, and key industry organizations including National Bureau of Standards, Northrop Aircraft, Raytheon, Remington Rand, and IBM. Provided by the Charles Babbage Institute, University of Minnesota.
UNIVAC Memories
Unisys History Newsletter Archive
Universal Automatic Computer Model II
UNIVAC 1004 80/90 Card Processor
The Case 1107 Processor
EXEC II – Unisys History Newsletter
UNIVAC Timeline
Functional UNIVAC 9400 at German Computer Museum
UNIVAC Simulator 1.2 – Shareware emulating UNIVAC I and II developed by Peter Zilahy Ingerman
UNIVAC I/II Console Photos and Marketing Materials (Off The Broiler blog)
UNIVAC Television Advertisement Archive
Sperry Corporation, UNIVAC Division Photograph Collection at the Hagley Museum and Library
Sperry Rand Corporation, Univac Division Records held at the Hagley Museum and Library
Sperry-UNIVAC Records preserved at the Hagley Museum and Library
Remington-Rand Presents the Univac Video