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by Gordonjcp
1440 days ago
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IBM used a DOS-based OS called "4690" for their point-of-sale systems, which IIRC had 32-bit extensions and various forms of networking including a weird 56kbps "token ring" type system that tills could (s-l-o-o-o-w-l-y) netboot off. It's still in use, and although it's been replaced by Linux in current products there were bugfix releases at least as recently as late 2020. |
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The revised license for CP/M from DRDOS, Inc this month covers "CP/M and derivatives".
DRDOS is a derivative of CP/M, as is Concurrent DOS/Multiuser DOS, and arguably the FlexOS line too.