UNIVAC 1100/2200 series

UNIVAC 1100/80
A Univac 1108 used to process the 1970 United States Census
UNIVAC 1100/80 Operations Room at University at Albany - SUNY, Albany, New York, 1981

Series of compatible 36-bit computer systems, beginning with the UNIVAC 1107 in 1962, initially made by Sperry Rand.

- UNIVAC 1100/2200 series

68 related topics



Line of electronic digital stored-program computers starting with the products of the Eckert–Mauchly Computer Corporation.

UNIVAC Sperry Rand label
Control panel for UNIVAC 1232
UNIVAC 1100/80
UNIVAC Console Printer

The 1107 was the first 36-bit, word-oriented machine with an architecture close to that which came to be known as that of the "1100 Series."


American multinational information technology services and consulting company headquartered in Blue Bell, Pennsylvania.

Important events in the company's history include the development of the 2200 series in 1986, including the UNISYS 2200/500 CMOS mainframe, and the Micro A in 1989, the first desktop mainframe, the UNISYS ES7000 servers in 2000, and the 3DVE Unisys blueprinting method of visualizing business rules and workflow in 2004.

Ones' complement

Value obtained by inverting all the bits in the binary representation of the number .

Arithmetic values thought to have been represented by parts of the Eye of Horus

Many early computers, including the UNIVAC 1101, CDC 160, CDC 6600, the LINC, the PDP-1, and the UNIVAC 1107, used ones' complement arithmetic.

Assembly language

Any low-level programming language with a very strong correspondence between the instructions in the language and the architecture's machine code instructions.

A meta-assembler is "a program that accepts the syntactic and semantic description of an assembly language, and generates an assembler for that language", or that accepts an assembler source file along with such a description and assembles the source file in accordance with that description. "Meta-Symbol" assemblers for the SDS 9 Series and SDS Sigma series of computers are meta-assemblers. Sperry Univac also provided a Meta-Assembler for the UNIVAC 1100/2200 series.

36-bit computing

36-bit computers were popular in the early mainframe computer era from the 1950s through the early 1970s.

Friden mechanical calculator. The electronic computer word length of 36-bits was chosen, in part, to match its precision.

Computers with 36-bit words included the MIT Lincoln Laboratory TX-2, the IBM 701/704/709/7090/7094, the UNIVAC 1103/1103A/1105 and 1100/2200 series, the General Electric GE-600/Honeywell 6000, the Digital Equipment Corporation PDP-6/PDP-10 (as used in the DECsystem-10/DECSYSTEM-20), and the Symbolics 3600 series.


Pioneering computer project run by the US Army Signal Corps in the late 1950s that intended to create a single standard (as defined in MIL-STD-188A/B/C ) for collecting and distributing battlefield information.

Military primary (1xxxxxx) code, a representative military supervisory (0xxxxxx) code, UNIVAC graphical code.

FIELDATA is the original character set used internally in UNIVAC computers of the 1100 series, each six-bit character contained in six sequential bits of the 36-bit word of that computer.


Computer system designed and built by Engineering Research Associates in the early 1950s and continued to be sold by the Remington Rand corporation after that company later purchased ERA.


A series of machines based on the same basic design followed, and were sold into the 1960s before being replaced by the similar-in-name-only UNIVAC 1100 family.

Thin-film memory

High-speed alternative to core memory developed by Sperry Rand in a government-funded research project.

A 32 x 32 core memory plane storing 1024 bits (or 128 bytes) of data. The small black rings at the intersections of the grid wires, organised in four squares, are the ferrite cores.

In 1962, the UNIVAC 1107, intended for the civilian marketplace, used thin-film memory only for its 128-word general register stack.

OS 2200

Operating system for the Unisys ClearPath Dorado family of mainframe systems.

Genealogy of software
Transaction processing diagram
Transaction scheduling diagram
Dispatching priorities diagram

There were earlier 1100 systems going back to the 1101 in 1951, but the 1108 was the first 1100 Series computer designed for efficient support of multiprogramming and multiprocessing.

Plated-wire memory

Variation of core memory developed by Bell Laboratories in 1957.

A 32 x 32 core memory plane storing 1024 bits (or 128 bytes) of data. The small black rings at the intersections of the grid wires, organised in four squares, are the ferrite cores.

It was used in the UNIVAC 1110 and UNIVAC 9000 series computers, the Viking program that sent landers to Mars, the Voyager space probes, a prototype guidance computer for the Minuteman-III, the Space Shuttle Main Engine controllers, the KH-9 Hexagon reconnaissance satellite, and in the Hubble Space Telescope.