The Zugliget Chairlift was originally operated with analogue controls, but was later converted to digital, which increased the safety and reliability of the structure. The digital drive control system was installed in 1990 and it still controls the structure today. It is part of a series of products developed at SZTAKI. The Chairlift is powered by a 75 kilowatt current inverter: this allows the Chairlift to reduce its speed on take-off and landing. This development would not have been possible without the appearance on the market in the late 1970s of thyristors: high-power switching semiconductors that made it possible to control the motors electronically. The digital drive controller developed at SZTAKI also used thyristors: domestically produced components were used to control the high-power motors. These are the red wired devices on the table.