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Re:Ask HN: What are the “Great Wonders of Software”, the gre... by Hermandw on Monday September 11, 2023 @10:37AM (#37467941)
Unisys MCP & MS-DOS. Two Operating systems.

MCP on Unisys mainframes was the most reliable Operating System I ever used.

MS-DOS started the world domination of Personal Computers, after a few false / failed starts by other desktop Operating Systems.

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