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For more than ha If a century there. have been radio hobbyists and amateur radio enthusiasts. Originally they used crystals, valves and discrete component semi-conductor technology. The advent of microelectronics greatly expanded the opportunities open to hobbyists and consequently, for example, led to a boom in radiocontrolled models. Today the number of electronics hobbyists is` estimated to be millions in Europe alone. A significant percentage of this number --estimated to be as high as 15 per cent -dedicate most of their spare-time to the new technology of micropro-cessors. Some hobbyists are more concerned with basic hardware, while others are searching for innovative applications. Both activities are often pursued collectively in clubs.