Air traffic control: the IBM 9020

The 9020 is a fascinating system, exemplary of so many of the challenges and excitement of the birth of the modern computer. On the one hand, a 9020 is a sophisticated, fault-tolerant, high-performance computer system with impressive diagnostic capabilities and remarkably dynamic resource allocation. On the other hand, a 9020 is just six to seven S/360 computers married to each other with a vibe that is more duct tape and bailing wire than aerospace aluminum and titanium.

J. B. Crawford

I was hooked from beginning to end. An absolutely exceptional article.