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{{Short description|SecondMainframe generation (c. 1959) scientific mainframecomputer}}
{{for|the tape-based operating system|IBM 7090/94 IBSYS}}
{{Use American English|date=February 2023}}
[[File:IBM 7090 console.nasa.jpg|thumb|280px|IBM 7090 console]]▼
{{Use mdy dates|date=February 2023}}
▲[[File:IBM 7090 console.nasa.jpg|thumb|280px|IBM 70907151 consoleConsole Control Unit for 7090]]
The '''IBM 7090''' is a second-generation [[Transistor computer|transistorized]] version of the earlier [[IBM 709]] vacuum tube [[mainframe computer]] that was designed for "large-scale scientific and technological applications". The 7090 is the fourth member of the [[IBM 700/7000 series#Scientific Architecture|IBM 700/7000 series]] scientific computers. The first 7090 installation was in December 1959.<ref>IBM states "the first 7090 was installed in December, 1959" at [https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP7090.html 7090 Data Processing System]</ref> In 1960, a typical system sold for $2.9 million (equivalent to ${{Inflation|US-GDP|2.9|1960|r=0}}&nbsp;million in {{Inflation-year|US}}) or could be rented for $63,500 a month ({{Inflation|US-GDP|63500|1960|r=-3|fmt=eq}}).
 
The 7090 uses a [[36-bit]] [[word length]], with an address space of 32,768 words (15-bit addresses).<ref name="comp-arch-n-org">{{cite book |title=Computer Architecture and Organization |last1=Hayes |first1=John.P |isbn=0-07-027363-4 |date=1978 |page=33}}</ref> It operates with a basic memory cycle of 2.18 μs, using the [[IBM 7302]] Core Storage [[Magnetic-core memory|core memory]] technology from the [[IBM 7030]] (Stretch) project.
 
With a processing speed of around 100 [[FLOPS|Kflop/s]],<ref>[{{cite web |url=https://projectswww.csresearchgate.dal.canet/ddrivepublication/dhb-future.pdf267998694 |title=Performance of future high-end computers by|last=Bailey |first=David Bailey|author-link=David LawrenceH. BerkeleyBailey National(mathematician) Laboratory|page=4 report]{{Dead link|date=January 2020n.d. |botwebsite=InternetArchiveBot[[ResearchGate]] |fixaccess-attempteddate=yesApril 16, 2022}}</ref> the 7090 is six times faster than the 709, and could be rented for half the price.<ref>{{cite book |first1=Emerson W. |last1=Pugh |first2=Lyle R. |last2=Johnson |first3=John H. |last3=Palmer |title=IBM's 360 and early 370 systems |url=https://archive.org/details/ibms360early370s0000pugh |url-access=registration |publisher=MIT Press |year=1991 |isbn=0-262-16123-0 |page=[https://archive.org/details/ibms360early370s0000pugh/page/36 36] }}</ref> An upgraded version, the 7094, was up to twice as fast. ItBoth wasthe 7090 and the 7094 were withdrawn from sale on July 14, 1969, but systems remained in service for more than a decade after.<ref>[{{cite web |url=https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP7094mainframe_PP7090.html |title=7090 Data Processing System |author=<!--Not stated--> |date=n.d. |publisher=IBM |access-date=April 16, 2022}}</ref><ref>{{cite web |url=https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP7090.html |title=7094 Data Processing System], IBM|author=<!--Not factstated--> sheet 1962,|date=n.d. |publisher=IBM archives|access-date=April 16, 2022}}</ref>The 7094 most notably, unlike most people say the 704 did, sang "[[Daisy Bell]]".
 
==Development and naming==
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===IBM 7094===
[[File:IBM 7094 console2console3.agr.JPGjpg|thumb|IBM 70947151-2 operator'sConsole consoleControl Unit for 7094 showing additional index register displays in a distinctive extra box on top. Note "Multiple Tag Mode" light in the top center.]]
An upgraded version, the '''IBM 7094''', was first installed in September 1962. It has seven [[index register]]s, instead of three on the earlier machines. The 70947151-2 consoleConsole Control Unit for the 7094 has a distinctive box on top that displays lights for the four new index registers.<ref>{{Cite web|url=http://www.columbia.edu/acis/history/7094.html|title = The IBM 7094}}</ref> The 7094 introduced double-precision floating point and additional [[Instruction set architecture|instructions]], but is largely maintained [[backward compatibility|backward compatible]] with the 7090.
<!-- If there are incompatibilities, please cite sources. -->
Although the 7094 has 4four more index registers than the 709 and 7090, at power-on time it is in ''multiple tag mode'',<ref name=IBM7094>{{cite manual|url=http://bitsavers.org/pdf/ibm/7094/A22-6703-4_7094_PoO_Oct66.pdf|title=IBM 7094 Principles of Operation|id=A22-6703-4|date=October 21, 1966|publisher=IBM}}</ref>{{rp|8}} compatible with the 709 and 7090, and requires a '''Leave Multiple Tag Mode'''<ref name=IBM7094/>{{rp|56}} instruction in order to enter ''seven index register mode'' and use all 7seven index registers. In multiple tag mode, when more than one bit is set in the tag field, the contents of the two or three selected index registers are logically [[Bitwise operation#OR|ORed]], not [[Binary number#Addition|added]], together, before the decrement takes place. In seven index register mode, if the three-bit tag field is not zero, it selects just one of seven index registers, however, the program can return to multiple tag mode with the instruction '''Enter Multiple Tag Mode''',<ref name=IBM7094/>{{rp|55}} restoring 7090 compatibility.
 
In April 1964, the first '''7094 II''' was installed, which had almost twice as much general speed as the 7094 due to a faster [[Clock signal|clock cycle]], dual memory banks and improved overlap of instruction execution, an early instance of [[Instruction pipelining|pipelined]] design.<ref>{{cite manual|url=http://bitsavers.org/pdf/ibm/7094/A22-6760_7094model2.pdf|title=IBM 7094 Model II Data Processing System|id=A22-6760|publisher=IBM}}</ref>
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==Instruction and data formats==
The basic instruction formatformats were the same as the [[IBM 709]]:
 
*A three-bit opcode (''prefix''), 15-bit ''decrement'' (D), three-bit ''tag'' (T), and 15-bit ''address'' (Y)
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*Variations of the above with different allocation of bits 12-17 or different allocations of bits 18-35
 
The documentation of opcodes used signed octal. The flag field indicated whether to use indirect addressing or not. The decrement field often contained an immediate operand to modify the results of the operation, or was used to further define the instruction type. The tag field might describe an index register to be operated on, or be used as described below. The Y field might contain an address, an immediate operand or an opcode modifier. For instructions where the tag field indicated indexing, the operation was▼
The documentation of opcodes used signed octal
▲The flag field indicated whether to use indirect addressing or not. The decrement field often contained an immediate operand to modify the results of the operation, or was used to further define the instruction type. The tag field might describe an index register to be operated on, or be used as described below. The Y field might contain an address, an immediate operand or an opcode modifier. For instructions where the tag field indicated indexing, the operation was
 
;T=0
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Data formats are
*[[Fixed-point arithmetic|Fixed-point]] numbers were stored in binary [[Signed number representations#Signed magnitude representationSign–magnitude|sign/magnitude format]].
* [[Single-precision]] [[floating-point]] numbers had a magnitude sign, an eight-bit excess-128 exponent and a 27-bit magnitude (numbers were binary, rather than the hexadecimal format introduced later for [[System/360]])
*[[Double-precision]] floating-point numbers, introduced on the 7094, had a magnitude sign, an eight-bit excess-128 exponent, and a 54-bit magnitude. The double-precision number was stored in memory in an even-odd pair of consecutive words; the sign and exponent in the second word were ignored when the number was used as an operand.
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==Input/output==
[[Image:IBM 7090 computer.jpg|thumb|left|An IBM 7090 operator's console at the NASA [[Ames Research Center]] in 1961, with the director of Ames and several IBM employees. The IBM 7151 Console Control Unit is on the right with two banks of [[IBM 729]] magnetic tape drives in back. The [[IBM 711]] card reader is in front of the man and woman at right.]]
The 7090 series features a data channel architecture for input and output, a forerunner of modern [[direct memory access]] I/O. Up to eight data channels can be attached, with up to ten [[IBM 729]] tape drives attached to each channel. The data channels have their own very limited set of operations called commands. These are used with tape (and later, disk) storage as well as card units and printers, and offered high performance for the time. Printing and [[punched card]] I/O, however, employed the same modified [[unit record equipment]] introduced with the 704 and was slow. It became common to use a less expensive [[IBM 1401]] computer to read cards onto [[magnetic tape]] for transfer to the 7090/94. Output would be written onto tape and transferred to the 1401 for printing or card punching using its much faster peripherals, notably the [[IBM 1403]] line printer.
 
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[[Image:NASAComputerRoom7090.NARA.jpg|thumb|280px|Dual 7090s at NASA during [[Project Mercury]].]]
 
*The [[Compatible Time-Sharing System]] (CTSS), onethe offirst thegeneral firstpurpose [[time-sharing]] operating systemssystem,<ref>{{cite report |last1=Singh |first1=Jai P. |last2=Morgan |first2=Robert P. |date=October 1971 |title=Educational Computer Utilization and Computer Communications |url=https://files.eric.ed.gov/fulltext/ED057575.pdf |publisher=Washington University |location=St. Louis, MO |id=National Aeronautics and Space Administration Grant No. Y/NGL-26-008-054 |page=13 |access-date=March 8, 2022 |quote=Much of the early development in the time-sharing field took place on university campuses.<sup>8</sup> Notable examples are the CTSS (Compatible Time-Sharing System) at MIT, which was the first general purpose time-sharing system...}}</ref> developed at [[Massachusetts Institute of Technology|MIT]]'s Computation Center usingon athree 7090successive withcomputers, an extraIBM bank of memory709, hardware interrupts7090 and instructions7094 towith support[[Request usingprice them,quotation|RPQs]] amongfor otheradditional modifications;features. itIt eventually ran on two separate 7094s, one of them at [[MIT Computer Science and Artificial Intelligence Laboratory#Project MAC|Project MAC]].<ref>{{cite web |url=https://people.csail.mit.edu/saltzer/Multics/CTSS-Documents/RPQs/RPQs.html |title=IBM 7094 Hardware Modifications for CTSS (RPQs) |author=<!--Not stated--> |date=n.d. |publisher=[[Massachusetts Institute of Technology]] |access-date=March 29, 2022}}</ref><ref name=7094CTSS>[http://multicians.org/thvv/7094.html The IBM 7094 and CTSS] Also contains links to many original CTSS documents</ref><ref name="ctsspg69">{{cite web |url=http://www.bitsavers.org/pdf/mit/ctss/CTSS_ProgrammersGuide_Dec69.pdf |title=The Compatible Time-Sharing System, A Programmer's Guide |editor-last=Crisman |editor-first=P.A. |date=December 31, 1969 |publisher=The M.I.T Computation Center |access-date=March 10, 2022}}</ref>
*It was the first computer to sing, singing "[[Daisy Bell]]".
*[[NASA]] used 7090s, and, later, 7094s to control the [[Project Mercury|Mercury]] and [[Project Gemini|Gemini]] space flights. [[Goddard Space Flight Center]] operated three 7094s. During the early [[Project Apollo|Apollo Program]], a 7094 was kept operational to run flight planning software that had not yet been ported to mission control's newer [[System/360]] computers. {{Citation needed|date=June 2010}}
*Caltech/NASA [[Jet Propulsion Laboratory]] had three 7094s in the Space Flight Operations Facility (SFOF, building 230), fed via tape using several 1401s, and two 7094/7044 direct-coupled systems (in buildings 125 and 156). {{underdiscussion-inline|Re: Notable applications: JPL}}
*Erhard Glatzel used an IBM 7090 to assist in calculations for the design of the [[Carl Zeiss Planar 50mm f/0.7]] lens commissioned by NASA. This lens was also used by [[Stanley Kubrick]] to shoot candlelit scenes in [[Barry Lyndon]].<ref>{{cite web | url=http://www.marcocavina.com/omaggio_a_kubrick.htm | title=Omaggio All }}</ref>
*An IBM 7090 was installed at LASL, Los Alamos Scientific Laboratory (Now [[Los Alamos National Laboratory]]).
*In 1961, Alexander Hurwitz used a 7090 to discover two [[Mersenne prime]]s, with 1,281 and 1,332 digits—the [[largest known prime number]] at the time.
*In 1961, [[Michael Minovitch]] used [[University of California, Los Angeles|UCLA]]'s 7090 to tackle the [[three-body problem]]. His research was the scientific foundation of [[NASA]]'s [[Planetary Grand Tour]] project.<ref>{{cite news |url=https://www.bbc.co.uk/news/science-environment-20033940 |title=The maths that made Voyager possible |first1=Christopher |last1=Riley |first2=Dallas |last2=Campbell |work=[[BBC News]] |date=23 October 23, 2012 }}</ref>
*On February 13, 1961, an IBM 7090 was installed at the Woomera Long Range Weapons Establishment in Southern Australia.<ref>{{Cite book|title=Fire Across the Desert: Woomera and the Anglo-Australian Joint Project 1946-1980|last=Morton|first=Peter|publisher=Australian Government Publishing Service|year=1989|isbn=0644475005|location=Canberra}} </ref><ref>{{cite book |last1=Morton |first1=Peter |title=Fire across the Desert : Woomera and the Anglo-Australian Joint Project 1946-1980 |date=1989 |publisher=AGPS Press |location=Canberra |isbn=0-6481804-0-9 |url=https://www.dst.defence.gov.au/publication/fire-across-the-desert |format=PDF Digitised 2017}}</ref>
*In 1962, a pair of 7090s in [[Briarcliff Manor, New York]], were the basis for the original version of the [[Sabre (computer system)|SABRE]] airlines reservation system introduced by American Airlines.
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*In 1967, Roger N. Shepard adapted M.V. Mathews' algorithm using an IBM 7090 to synthesize [[Shepard tone]]s.<ref>{{cite journal | author=Roger N. Shepard | author-link=Roger N. Shepard | title=Circularity in Judgements of Relative Pitch | journal=Journal of the Acoustical Society of America | volume=36 | issue=12 |date=December 1964 | pages=2346–53 | doi=10.1121/1.1919362 | bibcode=1964ASAJ...36.2346S | url=http://scitation.aip.org/docserver/fulltext/asa/journal/jasa/36/12/1.1919362.pdf?expires=1395757814&id=id&accname=408113&checksum=959B1C96D5DC3407A04C0568AE8A418D }}</ref>
*The US Air Force retired its last 7090s in service from the [[Ballistic Missile Early Warning System]] ("BMEWS") in the 1980s after almost 30 years of use. 7090 serial number 1 and serial number 3 were installed at [[Thule Air Base]] in [[Greenland]] for this application.
*The US Navy continued to use a 7094 at [[Pacific Missile Test Center]], [[Point Mugu]], [[California]] through much of the 1980s, although a "retirement" ceremony was held in July 1982. Not all of the applications had been {{clarify span|text=ported|explain=Did they port or re-write?|date=April 2022}} to its {{clarify span|text=successor,|explain=Is the CDC Cyber 175 a successor or a replacement?|date=April 2022}} a dual-processor [[CDC Cyber]] 175.{{cite needed|date=April 2022}}
 
=== In the media ===
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* An IBM 7090 is featured in the 2016 American biographical film ''[[Hidden Figures]].''
* IBM 7094 specs are visible scrolling on a screen in the 1997 film ''[[Event Horizon (film)|Event Horizon]]''.
 
== Competitors ==
Despite its commercial success, the IBM 7090 faced competition in the market. Notable contemporary competitors included, in alphabetical order:
 
* [[Bull Gamma 60]]
 
* [[Burroughs Large Systems]]
* [[CDC 1604]]
* [[CDC 3600]]
* [[Atlas (computer)|Ferranti Atlas]]
* [[GE-600 series]]
* [[Honeywell 800]]
* [[Philco computers#S-2000|Philco TRANSAC S-2000]]
* RCA 601
* Sylvania 9300
 
* [[UNIVAC 1100/2200 series]]
* [[UNIVAC 1107]]
 
==See also==
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*[[SHARE Operating System|SHARE]] and [[IBSYS]] operating systems
*[[SQUOZE]]
*[[UNIVAC 1100/2200 series]], UNIVAC's 36-bit scientific computing family
*[[University of Michigan Executive System]]
*[[List of IBM products]]
 
==References==
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| publisher = IBM
}}
* {{cite book |title=Programming and Coding the IBM 709-7090-7094 Computers |author-first=Philip M. |author-last=Sherman |date=1963 |publisher=[[John Wiley & Sons, Inc.]] |location=[[Bell Telephone Laboratories]], Murray Hill, New Jersey, USA |edition=1 |publication-place=New York / London / Sydney |url=http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/7090/books/Sherman_Programming_and_Coding_the_IBM_709-7090-7094_Computers_1963.pdf |access-date=2020-06-June 18, 2020 |url-status=live |archive-url=https://web.archive.org/web/20200618125754/http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/7090/books/Sherman_Programming_and_Coding_the_IBM_709-7090-7094_Computers_1963.pdf |archive-date=2020-06-June 18, 2020}}
 
==External links==
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*[http://www.ed-thelen.org/comp-hist/BRL61-ibm7070.html#IBM-7090 IBM 7090 Data Processing System from BRL61 Report]
*[http://www.frobenius.com/7090.htm IBM 7090/94 Architecture page]
*[http://www.317x.com/albums/i/IBM/card2.html IBM 7090 Music From Mathematics] {{Webarchive|url=https://web.archive.org/web/20120205233843/http://www.317x.com/albums/i/IBM/card2.html |date=February 5, 2012 }} recorded in 1960 by Bell Labs, using the "Digital to Sound Transducer" to realize several traditional and original compositions; this album contains the original Daisy (Bicycle Built for Two).
*[http://audio.textfiles.com/sounds/daisy.mp3 IBM 7094 singing Daisy (mp3) ]
*[http://simh.trailing-edge.com Bob Supnik's SimH project] – Includes a simulator for the 7090/7094 in a user-modifiable package
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