The ones I remember were on CATV systems. They used a 1" vidicon CCTV camera, usually the cheapest thing they could find. Shibaden comes to mind, but similar cameras were available from Concord, JVC, Panasonic and many others. I saw one that used a $99.95 camera from Olson Electronics. One town I used to visit had such a system, and also a big cockroach problem. Kids used to watch it to see the roaches run around over the weather dials.
