When I worked as a "Regional Hardware Controller" in the Department of Social Security in the last century (seems like yesterday but receding fast), the DSS used WANG terminals which pretended to be IBM ones, attached to a WANG mini computer pretending to be an Amdahl one, which connected to a mainframe that also pretended to be an IBM mainframe. Astonishingly it all worked, most of the time!
There was a service contract for each regional office the company in charge of maintenance was only paid each month if the service was up at least 95% of the time. That must have been difficult at times, as my office was in Albany, and the nearest repair person was based in Bunbury (a few hundred km away)!!!
https://nosher.net/archives/computers/pcw_1985-04-00_001_wang
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