Trying to find old models of UPS on anyone's website is impossible. I have often searched on APC's website for models of UPS that are only a few years old and there is absolutely no mention of them.
As for technical info such as diagrams and pinouts, I wish you all the best. UPS manufacturers seem to guard this information like it's of national interest.
Even for old machines that are no longer supported they won't part with the diagrams. Well, that's my experience with APC anyway - others may be different.
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