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Easily run old versions of UNIX for PDP-11 on modern hardware
| Date | Stars |
|---|---|
| 2026-07-25 | 256 |
| 2026-07-28 | 256 |
| 2026-07-30 | 256 |
| 2026-08-06 | 256 |
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<p align="center"> <img src="https://github.com/felipenlunkes/run-ancient-unix/blob/main/doc/banner.png"> </p> <div align="center">       [](https://twitter.com/lunx8086) </div> <hr> # Run ancient UNIX on modern hardware <div align="justify"> The contents of this repository allow older versions of [UNIX](https://en.wikipedia.org/wiki/Unix) ([ancient UNIX](https://en.wikipedia.org/wiki/Ancient_UNIX)) to run easily on modern [Unix-like](https://en.wikipedia.org/wiki/Unix-like) systems (Linux, FreeBSD, macOS, among others). At this time, you can run the following versions of UNIX: - UNIX versions for [PDP-11](https://en.wikipedia.org/wiki/PDP-11) (run on a PDP-11 simulator): - [x] [Version 1 UNIX](https://github.com/jserv/unix-v1); - [x] [Version 5 UNIX](https://gunkies.org/wiki/UNIX_Fifth_Edition); - [x] [Version 7 UNIX](https://en.wikipedia.org/wiki/Version_7_Unix); - [x] [2.11BSD UNIX](https://en.wikipedia.org/wiki/Berkeley_Software_Distribution). - UNIX versions for x86: - [x] [Version 7 UNIX](https://en.wikipedia.org/wiki/Version_7_Unix) ported to x86 architecture by [Robert Nordier](https://www.nordier.com/) (original port in 1999 and patches in 2006-2007). <hr> <hr> ## License, Credits and Copyright First of all, credits and acknowledgment for material available in this repository that is not my own (or has been modified by me based on previous work). - The UNIX versions available in this repository have been released as open source under the [Caldera license](doc/Caldera-license.pdf) available in this repository. Please read the document carefully for concrete information about your rights and obligations when using the software. - Note that various components within the system images may have been made available under other license conditions. Pay attention to these components. A clear example is version 2.11BSD UNIX, which features code covered by the Caldera license made available, in addition to code released under the [BSD license](doc/BSD-license.txt). Source files available in the images show the license and due copyright. Check this data before reuse. - The UNIX images available in this repository were obtained from the w11 project (which uses these images for other purposes). You can get them directly [here](https://wfjm.github.io/home/w11/inst/systems.html#h_os_kits), as well as more information about the project, images, licenses and other data. - The scripts used to simulate the systems using SIMH for v5 and v7 UNIX were obtained from a w11 project repository, which can be accessed [here](https://github.com/wfjm/w11/tree/master/tools/oskit). The original scripts are available under license GLP v3 or later. Modifications in these files were made by me, to fit the purpose of this repository. These modifications are restricted to the same license as the original script. - In addition, the general script for configuring the execution environment of versions v5 and v7 was obtained from the project, authored by [Walter F.J. Mueller](https://github.com/wfjm). You can get the original script [here](https://github.com/wfjm/w11/blob/master/tools/simh/setup_w11a_max.scmd). The original script are available under license GLP v3 or later. Modifications in these files were made by me, to fit the purpose of this repository. These modifications are restricted to the same license as the original script. - The port of Version 7 UNIX to th
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