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    Burroughs is significant for helping invent software engineering, safe computers, one co-founded INFOSEC after he left, and another got protections into Intel’s CPU’s. Bob Barton’s B5000 was incredible:

    https://www.smecc.org/The%20Architecture%20%20of%20the%20Burroughs%20B-5000.htm

    The MCP OS was also the villain in Tron, main character was based on Alan Kay, and Kay told me he’s a huge fan of B5000 and Bob Barton who he said was utterly brilliant. So, quite a legacy.

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      Feels like a commercial as the site itself doesn’t give me any useful information. Would you mind giving some insight into ClearPath?

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        ClearPath

        OS 2200 is the operating system for the ClearPath Dorado mainframe systems. The OS 2200 operating system is directly descended from EXEC-8 and the Unisys ClearPath mainframes in this series are the descents of the UNIVAC. See https://en.wikipedia.org/wiki/OS_2200 for info.

        MCP is the operating system for the ClearPath Forward mainframe systems. The MCP operating system is directly descended from the original MCP and the Unisys ClearPath mainframes in that series are descendants of Burroughs Large system mainframes. https://en.wikipedia.org/wiki/Burroughs_MCP for info.

        These are essentially the only two widely deployed mainframe systems that remain in constant mission-critical production outside of IBM systems and I think it is quite the treat that Unisys, the current owner of these platforms, has made free-of-cost virtualization solutions for these platforms available to mere hobbyists and enthusiasts.

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          Thank you very much. Hope I didn’t come across rude.

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            Not at all. It’s sometimes a challenge to balance editorializing vs. providing some additional context when you are familiar with the products but others are not. IBM offers a similar emulation/virtualization environment for developers but not for hobbyists and they enforce a developer training and certification requirement and charge a $900 fee for the ADCD - Application Development Controlled Distribution, which has very specific licensing restrictions disallowing any use beyond development. http://dtsc.dfw.ibm.com/adcd.html has info.

            In this context the Unisys offer, while not a “free” nor open-source distribution that the Linux or BSD community might want to see, is quite generous when you look at the industry norm.