Early Digital Research CP/M Source Code

And they forgot to put the posterior evolution of CP/M , with the multiuser versions, and later in a compatible "clone of MS-DOS", called DR-DOS.

One thing I never quite understood: in a home computing context, what is the advantage of having a system like CP/M, compared to, say, using a BASIC interpreter which includes the same commands?

I think CP/M is where the driver letters in windows came from. Now I know who did it.