Listeners tuning in to Portsmouth’s independent station Radio Victory, late at night in 1977, would have found themselves confronted with a mysterious electronic squeal. It sounded more like a transmitter malfunction or cat-like yawl than a music show. And yet, for the few hobbyists who owned a new-fangled “micro-computer”, this tinny squawk could be recorded and then fed via a tape-deck into one’s machine to play a puzzle game with “real prizes.”