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Re:Burroughs B 5500 Infomration Processing System (1964) [pdf] by Cullinet on Friday February 04, 2022 @09:27AM (#30207099)
"Burroughs software was designed to run only on proprietary hardware. For this reason, Burroughs was free to distribute the source code of all software it sold, including the MCP, which was designed with this openness in mind. "

so it should be around :

https://en.m.wikipedia.org/wiki/Burroughs_MCP

Re:Burroughs B 5500 Infomration Processing System (1964) [pdf] by rbanffy on Friday February 04, 2022 @03:47PM (#30212944)
Should we really try to run Tron’s villain?

It’s no coincidence Alan Kay, Bonnie McBird’s husband, was working at Unisys when she wrote the script.