https://en.wikipedia.org/wiki/Rational_R1000

Appears to be an ADA-based workstation?

Is this the same Rational as Rational ClearCase etc as acquired by IBM back in the day? Crazy

This is not only where ClearCase comes from, this is where "The Booch Method", UML, and the software for the Space Shuttle, The International Space Station, EuroControl (= pan-european air traffic control) and the F-22 fighter jet comes from. (Plus who knows how much other militarg hardware...)

It is a truly astonishing software development environment which with a a single key-press can answer questions like "what other code is affected if I change the default value of a parameter to this function". (Think about that one for a second!)

ClearCase is the worst VCS software that I ever used in my life. Maybe in the beginning of 90s it was better than existing alternatives, but I was using it well in 2000s, and it was horrible experience compared to already existing Git, Mercurial and even Subversion.

And if you add the cost (around $5000 per workplace), it becomes even less understandable.

It also required a designated CC admin or several admins.

> Is this the same Rational as Rational ClearCase etc as acquired by IBM back in the day? Crazy

Looks like it:

https://en.wikipedia.org/wiki/Rational_Software

> Rational Machines is an enterprise founded by Paul Levy and Mike Devlin in 1981 to provide tools to expand the use of modern software engineering practices, particularly explicit modular architecture and iterative development. It changed its name in 1994 to Rational Software, and was sold for US$2.1 billion (equivalent to current US$3.59 billion[1]) to IBM on February 21,[2] 2003.

Ada, not ADA