This video contains an overview of vintage pay TV and cable descramblers. ON-TV was an over-the-air pay TV service in the early 1980's which went out of business after cable TV became available (as cable offered dozens of channels for the same price). The Scientific Atlanta and Zenith cable boxes in this video have test chips installed, which trick them into descrambling all channels. Today, everything is digital, and these have no useful life other than for electronic nostalgia.