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Is this useful for hobbyists besides poking around and seeking the design philosophy at work back then?
Like would there be any advantage or reason to implement this in a home project? For example maybe that it's lightweight and has some rare compatibility or anything like that?
There are a lot of decades old embedded systems out there. Every so often you hear about a big company still relying on floppy disks and other old tech, including major railways and airplane companies. Having the source code will help with debugging better than having to disassemble or other reverse engineering.
MS-DOS 1.25, 2.0 were release years ago, your title should specify 4.0
Wake me when they release DOS 6.x source code.
Ah, the Quick and Dirty Operating System.... we meet again.
~~So not 3? Why not, because it was the most successful or something? 🤷~~
~~Plus I never even heard of 4 before. I'm going to have to look that up.~~
Bah, I was thinking of windows. I need to get some sleep.
As far as Windows goes, 95 was actually version 4.00.950 for the first version.
98 was 4.1, 2000 was 5.0, XP 5.1, Vista 6.0, 7 was 6.1, 8 was 6.2, 8.1 = 6.3
Then they jumped to 10 in both the name and internal version.
Windows 11 is still 10.0.x though.