Editing UNIVAC (section)

==Models==
{{main|List of UNIVAC products}}
[[File:Univac-I-Navy-Electronics-Supply-Office-BRL61-0992.jpg|thumb|right|250px|[[UNIVAC II]]]]
[[File:UNIVAC-1103-BRL61-0905.jpg|thumb|right|250px|[[UNIVAC 1103]]]]
[[File:UNIVAC-FILE-COMPUTER-BRL61-0944.jpg|thumb|right|250px|UNIVAC File Computer]]
[[File:Opdracht Univac, Bestanddeelnr 917-0538.jpg|thumb|right|250px|UNIVAC 1050]]
[[File:Univac 1232 - Udvar-Hazy Center - 1.JPG|thumb|right|250px|UNIVAC 1232]]
[[File:Control Panel for UNIVAC 1232 Computer.jpg|thumb|Control panel for UNIVAC 1232]]
[[File:255-GRC-1983-C-01769.jpg|thumb|right|250px|UNIVAC 1100/40]]
[[File:AlbanyStateUniversity ComputerOperationsRoom 1981 Univac1100-80 skaliert.jpg|thumb|right|250px|UNIVAC 1100/80]]
[[File:univacII.jpg|thumb|250px|right|[[UNIVAC 1108]]]]
[[File:UNIVAC Console Printer.jpg|thumb|UNIVAC Console Printer]]

In the course of its history, UNIVAC produced a number of separate model ranges. One early UNIVAC line of [[vacuum tube]] computers was based on the ERA&nbsp;1101 and those models built at ERA were rebadged as UNIVAC&nbsp;110x; despite the 1100 model numbers, they were not related to the latter 1100/2200 series. The 1103A is credited in the literature as the first computer to have interrupts.

The original model range was the [[UNIVAC I]] (UNIVersal Automatic Computer&nbsp;I), the second commercial computer made in the United States.{{efn|[[BINAC]], mentioned above, was the first.}} The main memory consisted of tanks of liquid mercury implementing [[delay-line memory]], arranged in 1,000&nbsp;words of 12 alphanumeric characters each. The first machine was delivered on 31 March 1951.

The [[Remington Rand 409]] was a [[plugboard|control panel]] programmed [[punched card]] calculator, designed in 1949, and sold in two models: the UNIVAC 60 (1952) and the UNIVAC 120 (1953).

The [[UNIVAC File Computer]] was first shipped in 1956. It was equipped with between one and ten large drums each holding 180,000 Alphanumeric characters.<ref>{{cite conference |last1=Daly |first1=R.P. |title=Integrated Data Processing with the Univac File Computer |book-title=Papers presented at the February 7–9, 1956, joint ACM-AIEE-IRE western computer conference |url=https://dl.acm.org/doi/pdf/10.1145/1455410.1455447 |date=February 7, 1956 |page=95 |doi=10.1145/1455410.1455447 |s2cid=17276776 |access-date=15 September 2023|url-access=subscription }}</ref>  One early application was for an [[airline reservations system]],<ref>{{cite conference |title=The Univac Air Lines Reservations System: A Special-Purpose Application of a General-Purpose Computer |book-title=Papers and discussions presented at the December 3–5, 1958, eastern joint computer conference: Modern computers: objectives, designs, applications |pages=152–156 |doi=10.1145/1458043.1458075 |date=December 3, 1958 |doi-access=free }}</ref> which was used by [[Eastern Air Lines]].<ref>{{cite conference |title=Reservations Communications Utilizing a General Purpose Digital Computer |doi=10.1145/1457720.1457753 |last1=McAvoy |first1=R. A. |book-title=Papers and discussions presented at the December 9–13, 1957, eastern joint computer conference: Computers with deadlines to meet |date=December 9, 1957 |pages=178–183 |doi-access=free }}</ref> It competed mainly against the [[IBM 650]] and the [[IBM 305 RAMAC]] and a total of 130 were manufactured.<ref name=Gandy>{{cite book |title= The Early Computer Industry: Limitations of Scale and Scope |first= A. |last= Gandy |url= https://books.google.com/books?id=viDGg4_NvPQC&pg=PA268 |page= 268 |isbn= 9780230389113 |date= September 15, 2023 |publisher= Springer }}</ref>

The [[UNIVAC II]] was an improvement to the [[UNIVAC&nbsp;I]] that UNIVAC first delivered in 1958. The improvements included magnetic (non-mercury) [[core memory]] of 2,000 to 10,000&nbsp;words, UNISERVO&nbsp;II tape drives, which could use either the old UNIVAC&nbsp;I metal tapes or the new [[PET film (biaxially oriented)|PET film]] tapes, and some circuits that were [[transistor]]ized (although it was still a [[vacuum-tube computer]]). It was fully compatible with existing UNIVAC&nbsp;I programs for both code and data. The UNIVAC&nbsp;II also added some instructions to the UNIVAC&nbsp;I's instruction set.

The [[UNIVAC Solid State]] was a 2-address, decimal computer, with memory on a rotating drum with 5,000 signed 10-digit words, aimed at the general-purpose business market. It came in two versions: the Solid State 80 (IBM-Hollerith 80-column cards) and the Solid State 90 (Remington-Rand 90-column cards). This computer used [[magnetic logic]], not transistors, because the transistors then available had highly variable characteristics and were not sufficiently reliable. Magnetic logic gates were based on magnetic cores with multiple wire windings; unlike vacuum tubes, they were solid-state devices and had a virtually infinite lifetime. The magnetic gates required drive pulses of current produced by a transmitter-type vacuum tube, of a type still used in amateur radio final amplifiers. Thus the Solid State depended, at the heart of its operations, on a vacuum tube, however, only a few tubes were required, instead of thousands, greatly increasing reliability.

Sperry Rand began shipment of [[UNIVAC III]] in 1962, and produced 96 UNIVAC&nbsp;III systems. Unlike the UNIVAC&nbsp;I and UNIVAC&nbsp;II, it was a binary machine as well as maintaining support for all UNIVAC&nbsp;I and UNIVAC&nbsp;II decimal and alphanumeric data formats for backward compatibility. This was the last of the original UNIVAC machines.

The [[UNIVAC 418]] (aka 1219), first shipped in 1962, was an [[18-bit]] word core memory machine. Over the three different models, more than 392 systems were manufactured.

The [[UNIVAC 490]] was a 30-bit word core memory machine with 16K or 32K words; 4.8&nbsp;microsecond cycle time. The UNIVAC 1232 was a military version of the 490.<ref>{{cite web|url=https://airandspace.si.edu/collection-objects/input-output-console-univac-1232/nasm_A19930083000|title=Input-Output Console, Univac 1232}}</ref>

The [[UNIVAC 492]] is similar to the [[UNIVAC 490]], but with [[extended memory]] to 64K 30-bit words.

The [[UNIVAC 494]] was a 30-bit [[Word (computer architecture)|word]] machine and successor to the UNIVAC 490/492 with faster [[Central processing unit|CPU]] and 131K (later 262K) core memory. Up to 24 I/O channels were available and the system was usually shipped with UNIVAC FH880 or UNIVAC FH432 or FH1782 magnetic drum storage. Basic operating system was OMEGA (successor to REX for the 490) although custom operating systems were also used (e.g. CONTORTS for airline reservations).

The [[UNIVAC 1050]] was an internally programmed computer with up to 32K of six-bit character memory, which was introduced in 1963. It was a one-address machine with 30-bit instructions, had a 4K operating system and was programmed in the PAL assembly language. The 1050 was used extensively by the U.S. Air Force supply system for inventory control (The Standard Base Level Supply System <ref>{{cite report |url=https://apps.dtic.mil/sti/pdfs/AD0673470.pdf |title=Implementation of the USAF Standard Base Supply System: A Quantitative Study |date=July 1968}}</ref><ref>{{cite report |url=https://apps.dtic.mil/sti/pdfs/ADA153710.pdf |title=Phase IV SBSS Data Element Architecture |date=February 1985}}</ref>).

{{anchor|U1004}}The '''UNIVAC 1004''' was a plug-board programmed punched-card data processing system, introduced in 1962 by UNIVAC. Total memory was 961 characters (6 bits per character) of [[magnetic-core memory|core memory]]. Peripherals were a card reader (400 cards/minute), a card punch (200 cards/minute) using proprietary 90-column, round-hole cards or IBM-compatible, 80-column cards, a drum printer (400 lines/minute) and a Uniservo tape drive.<ref>{{cite web |first=Ken |last=Shirriff |title=Reverse-engineering a mysterious Univac computer board |date=April 2022 |url=http://www.righto.com/2022/04/reverse-engineering-mysterious-univac.html |quote=... Robert Garner identified it as from the Univac 1004, ...}}</ref> The 1004 was also supported as a remote card reader & printer via synchronous communication services. A U.S. Navy (Weapons Station, Concord) 1004 was dedicated to printing from tape as a means of offloading the task from their Solid State 80 mainframe, which produced the tapes. A design for an "Emulator" board was available that would allow the plugboard 1004 to run programs read from card decks. The board was made by the customers, not by UNIVAC.<ref>{{cite web |url=https://collections.museumsvictoria.com.au/items/383697 |title=Item ST 43414 - Computer Plug-Board - Univac, Model 1004, circa1965 |website=Museums Victoria Collections |location=Australia |date=2014-06-27 |access-date=2023-07-02}}</ref> However, the Emulator made heavy use of the 1004's program-branching reed relays, called selectors, which caused increased failures, later solved by the use of electronic selectors in the follow-on 1005.

{{anchor|U1005}} The '''UNIVAC 1005''', an enhanced version of the UNIVAC 1004, was first shipped in February 1966.<ref>{{cite book
 |      series = Computer Characteristics Quarterly
 |       title = First and Second Quarters 1967
 |     section = Univac 1004 II, III and others
 |      volume = 7
 |       issue = 1–2
 |       pages = 62–63
 | section-url = http://ed-thelen.org/comp-hist/Adams-p062.gif
 |         url = http://ed-thelen.org/comp-hist/Adams-Assoc.html
 |   publisher = Adams Associates
 }}
</ref> The machine saw extensive use by the [[United States Army|US Army]], including the first use of an electronic computer on the battlefield. Additional peripherals were also available including a paper tape reader and a three pocket stacker selectable card read/punch. The machine had a two-stage assembler (SAAL – Single Address Assembly Language) which was its primary assembler; it also had a three-stage card based compiler for a programming language called SARGE. 1005s were used as some nodes on [[Automatic Digital Network|Autodin]]. There were actually two versions of the 1005. The Federal Systems (military) version described above and a Commercial Systems version for civilian use. While the two versions shared common memory and peripherals they had two completely different instruction sets.{{Citation needed|date=December 2023}}   The Commercial Systems version had a three pass assembler and a program generator.
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The [[UNIVAC 1100/2200 series]] is a series of compatible 36-bit [[transistor]]ized computer systems initially made by Sperry Rand. The first true member of the series was the 1107, also known as the Thin-Film Computer due to its use of [[Thin-film memory]] for its Control Memory store (128 registers). Delivery of the 1107 was late and this affected sales; the subsequent 1108 was considerably more successful, and helped to establish the series as viable competitors to the [[IBM System/360]]. The series continues to be supported today by [[Unisys|Unisys Corporation]] as the ClearPath Forward Dorado Series.<ref>{{cite web |url=http://www.unisys.com/offerings/high-end-servers/clearpath-forward-systems/clearpath-forward-dorado-systems |title=ClearPath Forward Dorado Systems |date=10 June 2021| publisher=[[Unisys]]}}</ref>

The '''[[UNIVAC 9000 series]]''' (9200, 9300, 9400, 9700) was introduced in the mid-1960s to compete with the low end of the IBM 360 series. The 9200 and 9300, which differed in CPU speed and maximum memory capacity (16K for the original 9200 vs 32K for the other variants) implemented the same 16-bit modified subset of the 360 architecture as the [[IBM System/360 Model 20|Model 20]], while the UNIVAC 9400 implemented a subset of the full 360 instruction set. This did not violate IBM patents or copyrights; Sperry gained the right to "clone" the 360 as settlement of a lawsuit concerning IBM's infringement of Remington Rand's core memory patents. The 9400 was roughly equivalent to the IBM 360/30. The 9000 series used [[plated-wire memory]], which functioned somewhat like [[magnetic-core memory|core memory]] but used a non-destructive read. Since the 9000 series was intended as direct competitors to IBM, they used 80-column cards and [[EBCDIC]] character encoding. Memory capacity started as low as 8K byte primary storage for a batch-configured system. Optionally a disk drive subsystem could be added, with 8414 5 MB disk drives as well as tape drives, using the Uniservo VI.

The '''[[UNIVAC Series 90]]''':

* High-end: (90/60, 90/70, 90/80): The high-end Series 90 machines were successors to the high-end UNIVAC 9000 machines, but added virtual memory and thus were similar, or equivalent, to later [[IBM System/370]] mainframes.
* Low-end: (90/30, 90/25, 90/40): Separately from the high-end series, Sperry Univac introduced the Univac 90/30 in about 1975 to provide an upgrade path for 9x00 users and to compete with IBM's [[IBM System/3|System 3]]. It used a disk operating system and had either a 300 or 600 lines per minute printer, a card reader, optionally a card punch, a console (Uniscope 100), attached disk drives that had removable disk packs, several 1,600 or 6,250 bpi tape drives, and an optional communications controller supporting up to 16 terminals (later 32) The standard disk drive was the 8416 which held a multi-layer platter removable disk pack that held approximately 29 million bytes. The 8418 drive was an enhanced version that supported both 29 MB and "double-density" 58 MB disk packs. These disk drives operated on the IDA (Integrated Disk Adapter). There was also an optional 8430 drive with a 100 MB capacity that operated on a separate high speed selector channel. Available tape drives were the Uniservo 10 (Mux Channel) and Uniservo 14 (Selector channel). The optional Selector Channel also enabled the use of other high speed devices such as the 1,200 lpm 0776 printer or the 2,000 lpm 0770 printer. The machine had either 4K or 16K memory chips, and typical machines had between 128 and 512 [[KiB]] memory. It ran an OS called OS/3, and could run up to 7 jobs at one time, not counting various OS extensions such as the print spooler and telecommunications access (ICAM). It was an upgrade path for users who had outgrown the IBM System/3. It ran Cobol-74, RPG2, Fortran, and Assembler. The instruction set of the 90/xx series was implemented in [[microcode]] and was loaded into [[control store|control storage]] as part of the boot up process, before loading the operating system.

:Shortly after the 90/30 was introduced, Sperry Univac introduced the 90/25 which was the same basic hardware, however had an option for a smaller 80 column card reader and was a bit slower. The machine executed 3 instructions and then a NOP (no op) to slow it down, as nearly every component was identical to the 90/30). Later a 90/40 model was added, with improved performance from a faster clock rate (cycle time of 500 ns vs 600 ns), [[Instruction prefetch|pre-fetching of the next instruction]], and greater maximum main memory capacity (1M vs 512K).
* The '''Sperry UNIVAC System 80 series''': The entire 90/xx series was eventually replaced in 1981 by the System 80, models 4 and 6. More powerful System 80's (models 8, 10 and 20) were introduced in 1984. These were Sperry-badged, IBM/360-like mainframes actually developed and engineered by Mitsubishi in Japan. The final System 80 was the model 7E, released in 1990 by Unisys.