Yes I had many of those KnC Jupiters. These ASICs actually made a killing for the first owners because they took orders in mid 2013 and they delivered them right before BTC went to like $1100 from $100 or so.
From what I recall they cost like $5000. However if you mined all the way thru middle of 2014 when mining got unprofitable you would of net yourself maybe $20K per ASIC if I recall correctly.
But you are correct, its only for SHA256D which is Bitcoin pretty much. And even with free power you won't make anything. Keep those KnC Jupiters in your museum. Maybe one day they will be worth something.
I got it for $50.00 about three or four years ago with a good 1300 watt power supply, actually got it for the aluminum case and the power supply.
It was not working when I first tried it and I was able to fix it and get it to mine.
I enjoyed tinkering with it.
Never really mined more than an hour so so just to see if it would work, then I put it on a shelf.