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I have been spending an inordinate amount of time trying to find the owners of the old Digital Research "Concurrent DOS" operating system. There's a lot of int
by tombert 6mo ago
I have been spending an inordinate amount of time trying to find the owners of the old Digital Research "Concurrent DOS" operating system. There's a lot of interesting turns in the search and it's been fun to document.
I've written a blog post about it [1] though there have been a few updates since I've written that.
I honestly think it might be a fun thing for me to keep doing, whether or not I'm successful with my search. I think there is a lot of old software that is just sitting on old hard drives that is waiting to be preserved.
[1] https://blog.tombert.com/Posts/Technical/2026/03-March/The-Quest-for-Concurrent-DOS-Part-1 https://blog.tombert.com/Posts/Technical/2026/03-March/The-Q...
- joleyj 6mo agoFYI 4699 OS is based on Concurrent DOS 286 and runs worldwide to this day https://en.wikipedia.org/wiki/4690_Operating_System?wprov=sfti1 https://en.wikipedia.org/wiki/4690_Operating_System?wprov=sf...
- tombert 6mo agoThanks for reading the post! I have been looking into the Concurrent DOS 286 and FlexOS lineage. Since there is still some level of commercial usage of it, it seems like people are a big more reluctant to talk about it in any capacity.
- deleted 6mo ago[deleted]
- davis 6mo agoDamn, this is really cool man. I'm a big fan of Gary Kildall, he's one of my heroes so this is great to read.