[Wuzado]

Checking Texas's CPA system, it seems like the company is (formally) active. The domain is registered at GoDaddy and it points to an IP in DigitalOcean's space.

If I had to assume, they probably still have some limited sales, support and consulting (ex. schools with teachers used to old software? companies with unusual development environments?).

While looking for Mix Software, Inc., though, I found their official(?) YouTube channel with the introductions for their C [0] and C++ [1] courses uploaded 8 years ago. They definitely have that old 90's VHS feeling to them, complete with music, early 3D animations and everything.

It would seem that the MIX C compiler for CP/M 80 got preserved at some point, too! [2] I'd need to look into it, but this looks promising.

[0] https://youtu.be/ikTh2JQbkls

[1] https://youtu.be/wAm3CKoJW3o

[2] http://www.cpm8680.com/mix/index.htm