Editing Michigan Terminal System (section)

==Hardware==
[[File:IBM360-67AtUmichWithMikeAlexander.jpg|thumb|right|Computing Center staff member Mike Alexander sitting at the console of the IBM System 360 Model 67 Duplex at the University of Michigan, 1969]]
[[File:Amdahl 470V-6 computer at U of M.jpg|thumb|right|Amdahl 470V/6 P2 at the University of Michigan, 1975]]

In theory MTS will run on the IBM S/360-67, any of the IBM S/370 series which include virtual memory, and their successors. MTS has been run
on the following computers in production, benchmarking, or trial configurations:<ref name=MTSVol1/>
*IBM: [[IBM System/360 Model 67|S/360-67]], [[IBM System/370#Series and models|S/370-148, S/370-168, 3033U, 4341, 4361, 4381, 3081D, 3081GX, 3083B, 3090–200, 3090–400, 3090–600, and ES/9000-720]]
*Amdahl: [[Amdahl Corporation|470V/6, 470V/7, 470V/8, 5860, 5870, 5990]]
*Hitachi: [[Hitachi|NAS 9060]]
*Various S/370 emulators

The University of Michigan installed and ran MTS on the first IBM S/360-67 outside of IBM (serial number 2) in 1967, the second Amdahl 470V/6 (serial number 2) in 1975,<ref>{{cite book|url=http://www.computerhistory.org/collections/accession/X436.84A|title=Amdahl 470/V6 mainframe computer - X436.84A - Computer History Museum|work=computerhistory.org|year=1975 }}</ref><ref>[https://docs.google.com/file/d/0B4t_NX-QeWDYaVpEZzNVTDRRdUdFaUJ5UjV5Q0xJQQ/edit "A performance Comparison of the Amdahl 470V/6 and the IBM 370/168"], Allan R. Emery and M. T. Alexander, a paper read at the meeting of the Computer Measurement Group, October 1975, San Francisco</ref> the first Amdahl 5860 (serial number 1) in 1982, and the first factory shipped IBM 3090–400 in 1986.<ref>Earlier 3090-400s were upgraded in the field from 3090-200s, [https://babel.hathitrust.org/cgi/pt?id=mdp.39015015410973;seq=203 "Installing the 3090"], ''UM Computing News'', vol 1, no. 8, 10 November 1986, p. 5</ref> NUMAC ran MTS on the first S/360-67 in the UK and very likely the first in Europe.<ref>[http://archive.michigan-terminal-system.org/discussions/how-did-sites-learn-about-and-make-the-decision-to-use-mts/3numac "E-mail from Ewan Page, First Director at NUMAC, to Denis Russell], 19 April 2011</ref> The University of British Columbia (UBC) took the lead in converting MTS to run on the [[IBM System/370|IBM S/370 series]] (an IBM S/370-168) in 1974. The University of Alberta installed the first Amdahl 470V/6 in Canada (serial number P5) in 1975.<ref name=UQVTimeline>{{cite web|url=https://www.ualberta.ca/~vbowler/HyperDispatch19/timeline.html|title=Timeline: Computing Services at the University of Alberta|work=ualberta.ca}}</ref> By 1978 NUMAC (at University of Newcastle upon Tyne and University of Durham) had moved main MTS activity on to its [[IBM System/370|IBM S/370 series]] (an IBM S/370-168).

MTS was designed to support up to four processors on the [[IBM System/360 Model 67|IBM S/360-67]], although IBM only produced one (simplex and half-duplex) and two (duplex) processor configurations of the Model 67. In 1984 RPI updated MTS to support up to 32 processors in the [[IBM System/370#Series and models|IBM S/370-XA]] (Extended Addressing) hardware series, although 6 processors is likely the largest configuration actually used.<ref>[http://archive.michigan-terminal-system.org/documentation/documents/MTSHistoryAtRPI-1989.pdf?attredirects=0 MTS History at RPI], 1989, 5p.</ref> MTS supports the IBM [[vector processor|Vector Facility]],<ref>[http://domino.research.ibm.com/tchjr/journalindex.nsf/600cc5649e2871db852568150060213c/c8f541b78dae5a6485256bfa00685bb2!OpenDocument "The IBM System/370 vector architecture"], W. Buchholz, ''IBM Systems Journal'', Volume 25, No. 1 (1986), pp. 51-62</ref> available as an option on the [[IBM System/370|IBM 3090]] and [[IBM ES/9000 family|ES/9000]] systems.

In early 1967 running on the single processor IBM S/360-67 at UM without [[virtual memory]] support, MTS was typically supporting 5 simultaneous terminal sessions and one batch job.<ref name=MTSVol1/> In November 1967 after virtual memory support was added, MTS running on the same IBM S/360-67 was simultaneously supporting 50 terminal sessions and up to 5 batch jobs.<ref name=MTSVol1/> In August 1968 a dual processor IBM S/360-67 replaced the single processor system, supporting roughly 70 terminal and up to 8 batch jobs.<ref name=Alexander1972>[https://drive.google.com/file/d/0B4t_NX-QeWDYTHFxRmI0a3dYNkU/view "Organization and features of the Michigan Terminal System"], M. T. Alexander, p. 586, ''Proceedings of the May 1972 AFIPS Spring Joint Computer Conference''</ref> By late 1991 MTS at UM was running on an IBM ES/9000-720 supporting over 600 simultaneous terminal sessions and from 3 to 8 batch jobs.<ref name=MTSVol1/>

MTS can be [[Booting#IBM System/360 and successors|IPL]]-ed under [[VM/370]], and some MTS sites did so, but most ran MTS on native hardware without using a [[virtual machine]].