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I have no idea how the UPS worked, it may well have a genset.
The term we used was 'noodstroomaggregaat' which translates to emergency power aggregate. It could be anything, and in the late 80's it most likely was a combination of lead acid batteries and a generator.
Size matters, and although te mainframes at the time were very large power consumers the extra load of the whole department around it would make the system more expensive, while it was almost never needed. We have a small but densely populated country and the grid is also quite dense and almost 100% reliable; power outages are very rare.
The decision to only allow the critical components to the UPS was therefore logical, just not perfectly executed.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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