I don't have a website for these, but I can give you some information on them. They were used nationally at most cable companies until the mid 90's and were provided free to the cable head-ends by the Prevue Channel (now the TV Guide Channel). They showed scrolling program listings and channel information genlocked over video-, something the Amiga, of course, excelled at. That is why they were used so long at cable companies, until it became difficult to get new and replacement parts.
The scrolling listings data was contained in the satellite-received baseband video signal, and stripped off by a Wegner- style card which fed the data to some sort of Broadcast Titler 2 style program. They are packed full of Zorro slot cards , ISA card and gen-lock video card and very crashproof-ours ran non-stop for many years before the Prevue Channel swapped out the old Amiga 2000 boxes for a new Dell server style Windows NT unit.. All the old Amiga's were supposed to be returned, nationally I believe,to PreVue Technologies, so your's are a rarity..and they must be sitting on a pile of them at some warehouse.
The other great cable company Amiga product is Magic Box a- a rack-mounted A1200 with CD and PC keyboard adapter-rock solid.