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67 lines
4.3 KiB
Markdown
67 lines
4.3 KiB
Markdown
---
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title: "Mainframe Operating Systems of 1960s"
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description: "In this post, we will see some Mainframe operating systems which were released in the 1960s and can be run on an emulator."
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slug: mainframe-operating-system-of-1960s
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authors: legacyinstaller
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tags: [mainframe, 1960s]
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keyword: [1960s, virtualhub, mainframe]
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image: ./img/leoiii.webp
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date: 2023-03-18T12:00
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---
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![Leo III from 1960s](./img/leoiii.webp)
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In this post, we will see some Mainframe operating systems which were released in the 1960s and can be run on an emulator.
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<!-- truncate -->
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## 1960
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### IBSys
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In the year 1960, an operating system called [IBSys](https://en.wikipedia.org/wiki/IBM_7090/94_IBSYS) was released for the [IBM 7094](https://en.wikipedia.org/wiki/IBM_7090#IBM_7094) mainframe computer. It was a very crude operating system. You can download a kit for running it using the SIMH emulator [here](http://simh.trailing-edge.com/kits/ibsys_kit.zip). The kit is made for Windows only. It needs to be heavily modified to run on Linux. You can download manuals from [bitsavers](http://www.bitsavers.org/pdf/ibm/7090/).
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## 1961
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### Leo III
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[Leo III](<https://en.wikipedia.org/wiki/LEO_(computer)#Applications_and_successors>) was a computer, actually, but the operating system that ran on it had no name. So, we will refer to it as Leo III.
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You can download a demo from [here](http://sw-pres.computerconservationsociety.org/Downloads/LeoIIIdemo3.zip). Follow the instructions in the `readme.htm` file inside the archive, and you should be up and running.
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## 1966
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### DOS/360
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[DOS/360](https://en.wikipedia.org/wiki/DOS/360) was an operating system for [IBM System/360](https://en.wikipedia.org/wiki/IBM_System/360), [System/370](https://en.wikipedia.org/wiki/IBM_System/370) and later mainframe computers. Very detailed instructions on how to run it in an emulator are available [here](https://sites.google.com/site/dos360install/).
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You can download the manuals from [bitsavers](https://bitsavers.org/pdf/ibm/360/dos/).
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### OS/360
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[OS/360](https://en.wikipedia.org/wiki/OS/360_and_successors) was also an operating system for [IBM System/360](https://en.wikipedia.org/wiki/IBM_System/360). You can run it using the instructions from [here](http://www.conmicro.com/hercos360/). Manuals are available from [bitsavers](http://www.bitsavers.org/pdf/ibm/360/os/).
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## 1967
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### MTS
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[MTS (Michigan Terminal System)](https://en.wikipedia.org/wiki/Michigan_Terminal_System) was an operating system developed for the [IBM System/360](https://en.wikipedia.org/wiki/IBM_System/360) and compatible mainframes at the University of Michigan. You can run it in an emulator using instructions [here](https://try-mts.com/up-and-running-1-installation/). Manuals are available from [bitsavers](http://www.bitsavers.org/pdf/univOfMichigan/mts/).
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### ITS
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[ITS (Incompatible Timesharing System)](https://en.wikipedia.org/wiki/Incompatible_Timesharing_System) was an operating system for [PDP-6](https://en.wikipedia.org/wiki/PDP-6) and [PDP-10](https://en.wikipedia.org/wiki/PDP-10) mainframe computers. It can be run on the SIMH emulator by following the instructions [here](https://www.cosmic.com/u/mirian/its/itsbuild.html). You can read more about it on the [Computer History Wiki](https://gunkies.org/wiki/Incompatible_Timesharing_System).
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## 1969
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### Multics
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[Multics (Multiplexed Information and Computing Service)](https://en.wikipedia.org/wiki/Multics) was an influential early time-sharing operating system for the [GE-645](https://en.wikipedia.org/wiki/GE_645) mainframes and the [Honeywell 6180](https://en.wikipedia.org/wiki/Honeywell_6000_series) series machines. It can be run in an emulator using the instructions [here](https://multics-wiki.swenson.org/index.php/Getting_Started). You can download manuals from [bitsavers](http://www.bitsavers.org/pdf/honeywell/large_systems/multics/).
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### George 3
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[George 3](<https://en.wikipedia.org/wiki/GEORGE_(operating_system)#GEORGE_3_&_4>) was an operating system for the [ICL 1900](https://en.wikipedia.org/wiki/ICT_1900_series) series of mainframes. It can be run in an emulator by following the instructions [here](http://perso.calvaedi.com/~john/George3/Linux.html).
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That's it. Of course there are many more Operating Systems which I have not covered, but these are all of them which I was able to find and run in emulators. If you know of more, please let me know in the comment section.
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Stay tuned!
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