osiweb.org

Someone wants $500 +shipping for a fancy OSI power strip
https://www.ebay.com/itm/115803067019

I'm guessing it was in one of the C3 business racks?

A month later and he is still asking for $430.00. I really don't think he'll get it.

Especially since an important part is missing, the cable that plugs into that odd socket. On the other end of that cable should be a key switch (that is, a lock cylinder with electrical contacts), mounted on a narrow strip of sheet metal that would in turn be mounted on the 19" equipment rack of a C3-B or C3-C, just under the floppy drives and above the CPU. The switch had four positions: off, CPU only on, CPU and floppies on, and all on (CPU, floppies, and hard drive). The whole thing was typically called a "power sequencer", as it ensured that power would be sequenced on and off in the correct order to avoid damage to data.