The many derivatives of the CP/M operating system

But still, CP/M was, for a while, the industry-standard microcomputer OS, making Digital Research a powerful and important company. Wealthy companies that lose dominance over a market they formerly controlled don't tend to just give up. Digital Research put a substantial R&D effort into expanding and enhancing CP/M, creating a large family of OSes. It had some significant wins and big sales. Some of those products are still in use. All those products are arguably CP/M derivatives", and as such, Bryan Sparks' 2001 edict might have just open-sourced them all.

One of the many giants we lost along the way.